diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index f4079d5..710ec63 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -70,5 +70,7 @@ jobs:
         run: |
           bundler exec rails db:create
           bundler exec rails db:migrate
+      - name: Enhance prepare commands with tailwindcss:build
+        run: bundle exec rake spec:prepare
       - name: Run tests
         run: bundler exec rspec
diff --git a/.rubocop.yml b/.rubocop.yml
index f8d8e07..69aad8b 100644
--- a/.rubocop.yml
+++ b/.rubocop.yml
@@ -23,4 +23,5 @@ Metrics/MethodLength:
   Max: 20
 
 Style/Documentation:
-  Enabled: false
\ No newline at end of file
+  Enabled: false
+  
\ No newline at end of file
diff --git a/Dockerfile b/Dockerfile
index a73b039..8f58215 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -16,17 +16,6 @@ RUN apt-get update -qq && apt-get install -y \
   build-essential \
   curl
 
-# Install rbenv
-RUN git clone https://github.com/rbenv/rbenv.git ~/.rbenv && \
-  echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc && \
-  echo 'eval "$(rbenv init -)"' >> ~/.bashrc && \
-  git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build && \
-  echo 'export PATH="$HOME/.rbenv/plugins/ruby-build/bin:$PATH"' >> ~/.bashrc
-
-# Install the specified Ruby version using rbenv
-ENV PATH="/root/.rbenv/bin:/root/.rbenv/shims:$PATH"
-RUN rbenv install $RUBY_VERSION && rbenv global $RUBY_VERSION
-
 # Set the working directory
 WORKDIR /app
 
@@ -35,7 +24,7 @@ COPY Gemfile /app/Gemfile
 COPY Gemfile.lock /app/Gemfile.lock
 
 # Install Gems dependencies
-RUN gem install bundler && bundle install
+RUN gem install bundler && bundle install --jobs 4 --retry 3
 
 # Copy the application code
 COPY . /app
diff --git a/Gemfile b/Gemfile
index d7f49ca..690d8e2 100644
--- a/Gemfile
+++ b/Gemfile
@@ -58,14 +58,19 @@ gem 'email_validator'
 
 # Styling
 gem 'bootstrap'
-gem 'sassc-rails'
-gem 'tailwindcss-rails', '~> 2.7'
+gem 'sassc', '~> 2.4'
+gem 'sassc-rails', '~> 2.1.2'
+gem 'tailwindcss-rails', '~> 3.1'
 
 gem 'dotenv-rails'
 
 # Use Active Storage variants [https://guides.rubyonrails.org/active_storage_overview.html#transforming-images]
 # gem "image_processing", "~> 1.2"
 
+group :test do
+  gem 'rails-controller-testing'
+end
+
 group :development, :test do
   # See https://guides.rubyonrails.org/debugging_rails_applications.html#debugging-with-the-debug-gem
   gem 'debug', platforms: %i[mri windows]
@@ -87,6 +92,9 @@ group :development do
   gem 'rubocop-rspec', require: false
   gem 'rubocop-rspec_rails', require: false
 
+  # To see in what paths rails are looking for translations
+  gem 'i18n-debug'
+
   # Add speed badges [https://github.com/MiniProfiler/rack-mini-profiler]
   # gem "rack-mini-profiler"
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 4f7dccb..81879fc 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -132,6 +132,8 @@ GEM
       activesupport (>= 6.1)
     i18n (1.14.6)
       concurrent-ruby (~> 1.0)
+    i18n-debug (1.2.0)
+      i18n (< 2)
     importmap-rails (2.0.2)
       actionpack (>= 6.0.0)
       activesupport (>= 6.0.0)
@@ -217,6 +219,10 @@ GEM
       activesupport (= 7.1.5.1)
       bundler (>= 1.15.0)
       railties (= 7.1.5.1)
+    rails-controller-testing (1.0.5)
+      actionpack (>= 5.0.1.rc1)
+      actionview (>= 5.0.1.rc1)
+      activesupport (>= 5.0.1.rc1)
     rails-dom-testing (2.2.0)
       activesupport (>= 5.0.0)
       minitest
@@ -307,18 +313,15 @@ GEM
     stimulus-rails (1.3.4)
       railties (>= 6.0.0)
     stringio (3.1.1)
-    tailwindcss-rails (2.7.7)
-      railties (>= 7.0.0)
-    tailwindcss-rails (2.7.7-aarch64-linux)
-      railties (>= 7.0.0)
-    tailwindcss-rails (2.7.7-arm-linux)
-      railties (>= 7.0.0)
-    tailwindcss-rails (2.7.7-arm64-darwin)
-      railties (>= 7.0.0)
-    tailwindcss-rails (2.7.7-x86_64-darwin)
-      railties (>= 7.0.0)
-    tailwindcss-rails (2.7.7-x86_64-linux)
+    tailwindcss-rails (3.1.0)
       railties (>= 7.0.0)
+      tailwindcss-ruby
+    tailwindcss-ruby (3.4.17)
+    tailwindcss-ruby (3.4.17-aarch64-linux)
+    tailwindcss-ruby (3.4.17-arm-linux)
+    tailwindcss-ruby (3.4.17-arm64-darwin)
+    tailwindcss-ruby (3.4.17-x86_64-darwin)
+    tailwindcss-ruby (3.4.17-x86_64-linux)
     thor (1.3.2)
     tilt (2.4.0)
     timeout (0.4.1)
@@ -361,12 +364,14 @@ DEPENDENCIES
   email_validator
   factory_bot_rails
   faker
+  i18n-debug
   importmap-rails
   jbuilder
   pg (~> 1.1)
   puma (>= 5.0)
   pundit
   rails (~> 7.1.3, >= 7.1.3.4)
+  rails-controller-testing
   rails-html-sanitizer (>= 1.6.1)
   rolify
   rspec-rails
@@ -376,10 +381,11 @@ DEPENDENCIES
   rubocop-rails
   rubocop-rspec
   rubocop-rspec_rails
-  sassc-rails
+  sassc (~> 2.4)
+  sassc-rails (~> 2.1.2)
   sprockets-rails
   stimulus-rails
-  tailwindcss-rails (~> 2.7)
+  tailwindcss-rails (~> 3.1)
   turbo-rails
   tzinfo-data
   web-console
diff --git a/app/assets/stylesheets/application.tailwind.css b/app/assets/stylesheets/application.tailwind.css
index 8666d2f..b5c61c9 100644
--- a/app/assets/stylesheets/application.tailwind.css
+++ b/app/assets/stylesheets/application.tailwind.css
@@ -1,13 +1,3 @@
 @tailwind base;
 @tailwind components;
 @tailwind utilities;
-
-/*
-
-@layer components {
-  .btn-primary {
-    @apply py-2 px-4 bg-blue-200;
-  }
-}
-
-*/
diff --git a/app/controllers/admin/users_controller.rb b/app/controllers/admin/users_controller.rb
new file mode 100644
index 0000000..5b9adaf
--- /dev/null
+++ b/app/controllers/admin/users_controller.rb
@@ -0,0 +1,90 @@
+# frozen_string_literal: true
+
+module Admin
+  class UsersController < ApplicationController
+    before_action :set_user, only: %i[show edit update destroy update edit_roles update_roles]
+    before_action :set_roles_list, only: %i[edit_roles update_roles]
+    before_action :set_user_params_roles, only: %i[update_roles]
+
+    # GET /admin/users or /admin/users.json
+    def index
+      @users = policy_scope(User.all)
+    end
+
+    # GET /admin/users/1 or /admin/users/1.json
+    def show
+      authorize @user
+    end
+
+    # GET /admin/users/1/edit
+    def edit
+      authorize @user
+    end
+
+    # PATCH/PUT /admin/users/1 or /admin/users/1.json
+    def update
+      authorize @user
+
+      respond_to do |format|
+        if @user.update(user_params)
+          format.html { redirect_to admin_user_url(@user), notice: t('.success') }
+          format.json { render :show, status: :ok, location: @user }
+        else
+          format.html { render :edit, status: :unprocessable_entity }
+          format.json { render json: @user.errors, status: :unprocessable_entity }
+        end
+      end
+    end
+
+    # DELETE /admin/users/1 or /admin/users/1.json
+    def destroy
+      authorize @user
+      @user.destroy!
+
+      respond_to do |format|
+        format.html { redirect_to admin_users_path, status: :see_other, notice: t('.success') }
+        format.json { head :no_content }
+      end
+    end
+
+    # GET /admin/users/1/edit_roles or /admin/users/1/edit_roles.json
+    def edit_roles
+      authorize @user
+    end
+
+    # POST /admin/users/1/update_roles or /admin/users/1/update_roles.json
+    def update_roles
+      authorize @user
+
+      respond_to do |format|
+        if @user.update_roles?(@user_params_roles)
+          format.html { redirect_to admin_user_url(@user), notice: t('.success') }
+          format.json { render :show, status: :ok, location: @user }
+        else
+          format.html { render :edit_roles, status: :unprocessable_entity }
+          format.json { render json: @user.errors, status: :unprocessable_entity }
+        end
+      end
+    end
+
+    private
+
+    # Use callbacks to share common setup or constraints between actions.
+    def set_user
+      @user = User.find(params[:id])
+    end
+
+    def set_roles_list
+      @roles = Role.distinct.pluck(:name).map { |role| [role.capitalize, role] }
+    end
+
+    def set_user_params_roles
+      @user_params_roles = user_params[:roles].compact_blank
+    end
+
+    # Only allow a list of trusted parameters through.
+    def user_params
+      params.require(:user).permit(:first_name, :last_name, :email, roles: [])
+    end
+  end
+end
diff --git a/app/helpers/users_helper.rb b/app/helpers/users_helper.rb
new file mode 100644
index 0000000..32eb038
--- /dev/null
+++ b/app/helpers/users_helper.rb
@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+module UsersHelper
+  def get_user_roles_list_as_string(user)
+    user.user_roles_names.map { |name| User::Roles::ROLES_MAP[name.to_sym] }.join(', ')
+  end
+
+  def get_user_role_ids_list(user)
+    user.user_roles_names
+  end
+end
diff --git a/app/models/user.rb b/app/models/user.rb
index 3858dd1..09bd22a 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -1,6 +1,8 @@
 # frozen_string_literal: true
 
 class User < ApplicationRecord
+  include ActionView::Helpers::TranslationHelper
+
   rolify
   resourcify
   after_commit :assign_default_role, on: :create
@@ -15,40 +17,96 @@ class User < ApplicationRecord
   has_many :measurements, dependent: :destroy
   has_and_belongs_to_many :roles, join_table: :users_roles # rubocop:disable Rails/HasAndBelongsToMany
 
+  accepts_nested_attributes_for :roles
+
   validates :email, presence: true, uniqueness: true, email: true
 
   def full_name
     "#{first_name} #{last_name}"
   end
 
+  def user_roles_names
+    roles.pluck(:name)
+  end
+
   def full_access_roles_can?
-    has_any_role?(*User::Roles::FULL_ACCESS_ROLES)
+    has_any_role?(*Roles::FULL_ACCESS_ROLES)
   end
 
   def all_roles_can?
-    has_any_role?(*User::Roles::ROLES)
+    has_any_role?(*Roles::ROLES)
   end
 
   def admin?
-    has_role?(User::Roles::ADMIN)
+    has_role?(Roles::ADMIN)
   end
 
   def doctor?
-    has_role?(User::Roles::DOCTOR)
+    has_role?(Roles::DOCTOR)
   end
 
   def health_coach?
-    has_role?(User::Roles::HEALTH_COACH)
+    has_role?(Roles::HEALTH_COACH)
   end
 
   def user?
-    has_role?(User::Roles::USER)
+    has_role?(Roles::USER)
+  end
+
+  def update_roles?(new_roles)
+    User.transaction do
+      synchronize_roles(new_roles)
+
+      raise ActiveRecord::Rollback unless errors.empty?
+    rescue StandardError => e
+      handle_unexpected_transaction_error(e)
+
+      raise ActiveRecord::Rollback
+    end
+    are_errors_empty = errors.empty?
+
+    unless are_errors_empty
+      Rails.logger.error("Role update failed for Account ID #{id}: #{errors.full_messages.join(', ')}")
+    end
+
+    are_errors_empty
   end
 
   private
 
   def assign_default_role
-    add_role(User::Roles::USER) if roles.blank?
+    add_role(Roles::USER) if roles.blank?
+  end
+
+  def synchronize_roles(new_roles)
+    return unless validate_roles(new_roles)
+
+    current_roles = roles.pluck(:name)
+
+    roles_to_remove = current_roles - new_roles
+    roles_to_remove.each do |role|
+      remove_role(role) || errors.add(:base, t('errors.messages.remove_role_failure', role: 'role'))
+    end
+
+    roles_to_add = new_roles - current_roles
+    roles_to_add.each do |role|
+      add_role(role) || errors.add(:base, t('errors.messages.add_role_failure', role: 'role'))
+    end
+  end
+
+  def validate_roles(new_roles)
+    valid_roles = Role.pluck(:name)
+    invalid_roles = new_roles - valid_roles
+    unless invalid_roles.empty?
+      errors.add(:base, t('errors.messages.invalid_roles_detected', invalid_roles: invalid_roles.join(', ')))
+    end
+
+    invalid_roles.empty?
+  end
+
+  def handle_unexpected_transaction_error(error)
+    errors.add(:base, t('errors.messages.unexpected_error'))
+    Rails.logger.error("Unexpected error while synchronizing roles: #{error.message}")
   end
 
   class Roles < User
@@ -59,5 +117,12 @@ class Roles < User
 
     ROLES = [ADMIN, DOCTOR, HEALTH_COACH, USER].freeze
     FULL_ACCESS_ROLES = [ADMIN, DOCTOR, HEALTH_COACH].freeze
+
+    ROLES_MAP = {
+      ADMIN => 'Admin',
+      DOCTOR => 'Doctor',
+      HEALTH_COACH => 'Health coach',
+      USER => 'User'
+    }.freeze
   end
 end
diff --git a/app/policies/user_policy.rb b/app/policies/user_policy.rb
new file mode 100644
index 0000000..20025fc
--- /dev/null
+++ b/app/policies/user_policy.rb
@@ -0,0 +1,41 @@
+# frozen_string_literal: true
+
+class UserPolicy < ApplicationPolicy
+  def index?
+    user.admin?
+  end
+
+  def show?
+    user.admin?
+  end
+
+  def create?
+    user.admin?
+  end
+
+  def update?
+    user.admin?
+  end
+
+  def destroy?
+    user.admin?
+  end
+
+  def edit_roles?
+    user.admin?
+  end
+
+  def update_roles?
+    user.admin?
+  end
+
+  class Scope < ApplicationPolicy::Scope
+    def resolve
+      if user.admin?
+        scope.all
+      else
+        scope.where(user: user)
+      end
+    end
+  end
+end
diff --git a/app/views/admin/users/_form.html.erb b/app/views/admin/users/_form.html.erb
new file mode 100644
index 0000000..10b2950
--- /dev/null
+++ b/app/views/admin/users/_form.html.erb
@@ -0,0 +1,32 @@
+<%= form_with model: @user, url: admin_user_path(@user), method: :patch do |form| %>
+  <% if @user.errors.any? %>
+    <div style="color: red">
+      <h2><%= pluralize(@user.errors.count, "error") %> prohibited this user from being saved:</h2>
+
+      <ul>
+        <% @user.errors.each do |error| %>
+          <li><%= error.full_message %></li>
+        <% end %>
+      </ul>
+    </div>
+  <% end %>
+
+  <div>
+    <%= form.label :first_name, style: "display: block" %>
+    <%= form.text_field :first_name %>
+  </div>
+
+  <div>
+    <%= form.label :last_name, style: "display: block" %>
+    <%= form.text_field :last_name %>
+  </div>
+
+  <div>
+    <%= form.label :email, style: "display: block" %>
+    <%= form.text_field :email %>
+  </div>
+
+  <div>
+    <%= form.submit class: "tw-my-4 tw-bg-blue-500  tw-hover:bg-blue-700 tw-text-white tw-font-bold tw-py-2 tw-px-4 tw-rounded" %>
+  </div>
+<% end %>
diff --git a/app/views/admin/users/_index_table_body.html.erb b/app/views/admin/users/_index_table_body.html.erb
new file mode 100644
index 0000000..774fe0a
--- /dev/null
+++ b/app/views/admin/users/_index_table_body.html.erb
@@ -0,0 +1,24 @@
+<tbody>
+    <% @users.each do |user| %>
+      <tr id="<%= dom_id user %>" class="tw-bg-white tw-border-b tw-bg-white tw-border-gray-300 tw-hover:bg-gray-700 tw-text-center">
+        <th scope="row" class="tw-px-6 tw-py-4 tw-font-medium tw-text-gray-900 tw-whitespace-nowrap tw-dark:tw-text-white">
+          <%= user.full_name %>
+        </th>
+        <td class="tw-px-2 tw-py-2">
+          <%= user.email %>
+        </td>
+        <td class="tw-px-2 tw-py-2">
+          <%= get_user_roles_list_as_string user %>
+        </td>
+        <td class="tw-px-6 tw-py-4">
+          <%= format_date_with_time user.created_at %>
+        </td>
+        <td class="tw-px-6 tw-py-4">
+          <%= format_date_with_time user.updated_at %>
+        </td>
+        <td class="tw-px-6 tw-py-4 tw-text-center">
+          <%= link_to "Show details", admin_user_url(user), class: "tw-font-medium tw-text-blue-600 tw-dark:tw-text-blue-500 tw-hover:tw-underline" %>
+        </td>
+      </tr>
+    <% end %>
+</tbody>
diff --git a/app/views/admin/users/_index_table_head.html.erb b/app/views/admin/users/_index_table_head.html.erb
new file mode 100644
index 0000000..a2dc70b
--- /dev/null
+++ b/app/views/admin/users/_index_table_head.html.erb
@@ -0,0 +1,24 @@
+<thead class="tw-text-xs tw-text-gray-700 tw-uppercase tw-bg-gray-400 tw-text-center">
+
+<tr>
+  <th scope="col" class="tw-px-6 tw-py-3">
+    User
+  </th>
+  <th scope="col" class="tw-px-6 tw-py-3">
+    Email
+  </th>
+  <th scope="col" class="tw-px-6 tw-py-3">
+    Role
+  </th>
+  <th scope="col" class="tw-px-6 tw-py-3">
+    Created date
+  </th>
+  <th scope="col" class="tw-px-6 tw-py-3">
+    Updated date
+  </th>
+  <th scope="col" class="tw-px-6 tw-py-3">
+    <span class="tw-sr-only">Show</span>
+  </th>
+</tr>
+
+</thead>
\ No newline at end of file
diff --git a/app/views/admin/users/_user.html.erb b/app/views/admin/users/_user.html.erb
new file mode 100644
index 0000000..7c62222
--- /dev/null
+++ b/app/views/admin/users/_user.html.erb
@@ -0,0 +1,31 @@
+<div id="<%= dom_id user %>" class="tw-border-double tw-shadow-lg tw-ring-4 tw-rounded-lg">
+  <div class="tw-m-8 tw-py-4">
+
+    <p class="tw-pt-2 tw-pr-6">
+      <strong>User Name:</strong>
+      <%= user.full_name %>
+    </p>
+
+    <p class="tw-pt-2 tw-pr-6">
+      <strong>Email:</strong>
+      <%= user.email %>
+    </p>
+    
+    <p class="tw-pt-2 tw-pr-6">
+      <strong>Role:</strong>
+      <%= get_user_roles_list_as_string user %>
+    </p>
+
+    <p class="tw-pt-2 tw-pr-6">
+      <strong>Created at:</strong>
+      <%= format_date_with_time user.created_at %>
+    </p>
+
+    <p class="tw-pt-2 tw-pr-6">
+      <strong>Updated at:</strong>
+      <%= format_date_with_time user.updated_at %>
+    </p>
+
+  </div>
+
+</div>
diff --git a/app/views/admin/users/_user.json.jbuilder b/app/views/admin/users/_user.json.jbuilder
new file mode 100644
index 0000000..2ce5a95
--- /dev/null
+++ b/app/views/admin/users/_user.json.jbuilder
@@ -0,0 +1,4 @@
+# frozen_string_literal: true
+
+json.extract! user, :id, :first_name, :last_name, :email, :created_at, :updated_at
+json.url admin_user_url(user, format: :json)
diff --git a/app/views/admin/users/edit.html.erb b/app/views/admin/users/edit.html.erb
new file mode 100644
index 0000000..c6cda3f
--- /dev/null
+++ b/app/views/admin/users/edit.html.erb
@@ -0,0 +1,8 @@
+<h1>Editing user</h1>
+
+<%= render "form", user: @user %>
+
+<div>
+  <%= link_to "Show this user", admin_user_url(@user) %> |
+  <%= link_to "Back to users", admin_users_path %>
+</div>
diff --git a/app/views/admin/users/edit_roles.html.erb b/app/views/admin/users/edit_roles.html.erb
new file mode 100644
index 0000000..11f1993
--- /dev/null
+++ b/app/views/admin/users/edit_roles.html.erb
@@ -0,0 +1,33 @@
+<h1>Editing user roles</h1>
+
+<%= form_with model: @user, url: update_roles_admin_user_path(@user), method: :post do |form| %>
+  <% if @user.errors.any? %>
+    <div style="color: red">
+      <h2><%= pluralize(@user.errors.count, "error") %> prohibited this user from being saved:</h2>
+
+      <ul>
+        <% @user.errors.each do |error| %>
+          <li><%= error.full_message %></li>
+        <% end %>
+      </ul>
+    </div>
+  <% end %>
+
+  <div>
+    <%= form.label :roles, style: "display: block" %>
+    <%= form.select :roles,
+                    options_for_select(@roles, get_user_role_ids_list(@user)),
+                    {},
+                    multiple: true %>
+  </div>
+
+  <div>
+    <%= form.submit class: "tw-my-4 tw-bg-blue-500  tw-hover:bg-blue-700 tw-text-white tw-font-bold tw-py-2 tw-px-4 tw-rounded" %>
+  </div>
+<% end %>
+
+<div>
+  <%= link_to "Show this user", admin_user_url(@user) %> |
+  <%= link_to "Back to users", admin_users_path %>
+</div>
+
diff --git a/app/views/admin/users/index.html.erb b/app/views/admin/users/index.html.erb
new file mode 100644
index 0000000..0b04feb
--- /dev/null
+++ b/app/views/admin/users/index.html.erb
@@ -0,0 +1,13 @@
+<section>
+  <header class="tw-my-2 tw-flex tw-flex-center tw-justify-between tw-items-center">
+    <h1 class="tw-text-lg">Users</h1>
+  </header>
+
+  <div id="users" class="tw-relative tw-overflow-x-auto tw-shadow-md tw-sm:tw-rounded-lg">
+    <table class="tw-w-full tw-text-sm tw-text-left tw-text-right tw-rounded-md">
+      <%= render "index_table_head" %>
+      <%= render "index_table_body", users: @users %>
+    </table>
+  </div>
+
+</section>
diff --git a/app/views/admin/users/index.json.jbuilder b/app/views/admin/users/index.json.jbuilder
new file mode 100644
index 0000000..2ff955e
--- /dev/null
+++ b/app/views/admin/users/index.json.jbuilder
@@ -0,0 +1,3 @@
+# frozen_string_literal: true
+
+json.array! @users, partial: 'users/user', as: :user
diff --git a/app/views/admin/users/show.html.erb b/app/views/admin/users/show.html.erb
new file mode 100644
index 0000000..eb66256
--- /dev/null
+++ b/app/views/admin/users/show.html.erb
@@ -0,0 +1,15 @@
+<%= render "user", user: @user %>
+
+<div>
+  <%= link_to "Edit this user", edit_admin_user_path(@user) %> |
+  <%= link_to "Change this user roles", edit_roles_admin_user_path(@user) %> |
+  <%= link_to "Back to users", admin_users_path %>
+
+  <%= button_to(
+        "Remove this user",
+        edit_admin_user_path(@user),
+        method: :delete,
+        data: { turbo_method: :delete, turbo_confirm: "Are you sure?" },
+        class: "tw-mt-6 tw-mr-6 tw-mb-6 tw-bg-red-500 tw-hover:bg-blue-700 tw-text-white tw-font-bold tw-py-2 tw-px-4 tw-rounded"
+      ) %>
+</div>
diff --git a/app/views/admin/users/show.json.jbuilder b/app/views/admin/users/show.json.jbuilder
new file mode 100644
index 0000000..48cca18
--- /dev/null
+++ b/app/views/admin/users/show.json.jbuilder
@@ -0,0 +1,3 @@
+# frozen_string_literal: true
+
+json.partial! 'users/user', user: @user
diff --git a/app/views/layouts/_navbar.html.erb b/app/views/layouts/_navbar.html.erb
index 793092e..01896dc 100644
--- a/app/views/layouts/_navbar.html.erb
+++ b/app/views/layouts/_navbar.html.erb
@@ -21,6 +21,11 @@
         <li class="nav-item">
           <%= link_to "Biomarkers", biomarkers_path, class: "nav-link #{current_page?(biomarkers_path) ? 'active' : ''}" %>
         </li>
+        <li class="nav-item">
+          <% if current_user&.admin? %>
+            <%= link_to "Users", admin_users_path, class: "nav-link #{current_page?(admin_users_path) ? 'active' : ''}" %>
+          <% end %>
+        </li>
       </ul>
       <% if user_signed_in? %>
         <span> Welcome <%= current_user.full_name %> </span>
diff --git a/config/application.rb b/config/application.rb
index 821cbb6..fab9667 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -40,5 +40,9 @@ class Application < Rails::Application
 
     # Don't generate system test files.
     config.generators.system_tests = nil
+
+    # Fixes broken tailwind.css build for CI
+    # @see https://github.com/rails/tailwindcss-rails/issues/153#issuecomment-1225895063
+    config.assets.css_compressor = nil
   end
 end
diff --git a/config/locales/en.yml b/config/locales/en.yml
index fd727f4..7d261de 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -62,7 +62,22 @@ en:
       success: "Lab test was successfully updated."
     destroy:
       success: "Lab test was successfully removed."
+  admin:
+    users:
+      update:
+        success: "User was successfully updated."
+      destroy:
+        success: "User was successfully removed."
+      update_roles:
+        success: "User roles were successfully updated."
 
   application:
     user_not_authorized:
       failure: 'You are not authorized to perform this action.'
+
+  errors:
+    messages:
+      invalid_roles_detected: "Invalid roles detected: %{invalid_roles}"
+      remove_role_failure: "Failed to remove role: %{role}"
+      add_role_failure: "Failed to add role: %{role}"
+      unexpected_error: "Unexpected error while synchronizing roles"
diff --git a/config/routes.rb b/config/routes.rb
index 5efdc48..87b6d42 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -9,6 +9,14 @@
   resources :measurements
   resources :lab_tests
   resources :health_records
+  namespace :admin do
+    resources :users, only: %i[index show edit update destroy] do
+      member do
+        get :edit_roles
+        post :update_roles
+      end
+    end
+  end
   devise_for :users
   # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html
 
diff --git a/db/migrate/20241230074802_add_unique_index_to_roles_name.rb b/db/migrate/20241230074802_add_unique_index_to_roles_name.rb
new file mode 100644
index 0000000..4ec54d2
--- /dev/null
+++ b/db/migrate/20241230074802_add_unique_index_to_roles_name.rb
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+class AddUniqueIndexToRolesName < ActiveRecord::Migration[7.1]
+  def change
+    add_index :roles, :name, unique: true
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 561b22c..c74842f 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.1].define(version: 2024_11_26_065249) do
+ActiveRecord::Schema[7.1].define(version: 2024_12_30_074802) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
@@ -77,6 +77,7 @@
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.index ["name", "resource_type", "resource_id"], name: "index_roles_on_name_and_resource_type_and_resource_id"
+    t.index ["name"], name: "index_roles_on_name", unique: true
     t.index ["resource_type", "resource_id"], name: "index_roles_on_resource"
   end
 
diff --git a/docker-compose.override.yml b/docker-compose.override.yml
new file mode 100644
index 0000000..972b446
--- /dev/null
+++ b/docker-compose.override.yml
@@ -0,0 +1,8 @@
+services:
+  health-keeper-app:
+    volumes:
+      - ./:/app
+      - bundle_cache:/usr/local/bundle
+
+volumes:
+  bundle_cache:
diff --git a/docker-compose.yml b/docker-compose.yml
index 79de2d1..65bc163 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -5,9 +5,6 @@ services:
       - '3000:3000'
     depends_on:
       - health-keeper-postgres
-    volumes:
-      - ./:/app
-      - gem_cache:/usr/local/bundle/gems
     tty: true
 
   health-keeper-postgres:
@@ -23,4 +20,3 @@ services:
 
 volumes:
   health-keeper-postgres:
-  gem_cache:
diff --git a/spec/factories/roles.rb b/spec/factories/roles.rb
new file mode 100644
index 0000000..8d697f7
--- /dev/null
+++ b/spec/factories/roles.rb
@@ -0,0 +1,7 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :role do |f|
+    f.name { Faker::Job.unique.position }
+  end
+end
diff --git a/spec/factories/users.rb b/spec/factories/users.rb
new file mode 100644
index 0000000..4855f02
--- /dev/null
+++ b/spec/factories/users.rb
@@ -0,0 +1,13 @@
+# frozen_string_literal: true
+
+FactoryBot.define do
+  factory :user do |f|
+    f.first_name { Faker::Name.first_name }
+    f.last_name { Faker::Name.last_name }
+    f.email { Faker::Internet.unique.email }
+    f.password { 'password' }
+    trait :admin do
+      after(:create) { |user| user.add_role(:admin) }
+    end
+  end
+end
diff --git a/spec/helpers/users_helper_spec.rb b/spec/helpers/users_helper_spec.rb
new file mode 100644
index 0000000..0f1c418
--- /dev/null
+++ b/spec/helpers/users_helper_spec.rb
@@ -0,0 +1,61 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe UsersHelper do
+  let(:user) { instance_double(User, user_roles_names: %w[admin doctor health_coach]) }
+
+  describe '#get_user_roles_list_as_string' do
+    context 'when the user has valid roles' do
+      it 'returns a comma-separated string of role names' do
+        result = helper.get_user_roles_list_as_string(user)
+        expect(result).to eq('Admin, Doctor, Health coach')
+      end
+    end
+
+    context 'when the user has no roles' do
+      let(:user) { instance_double(User, user_roles_names: []) }
+
+      it 'returns an empty string' do
+        result = helper.get_user_roles_list_as_string(user)
+        expect(result).to eq('')
+      end
+    end
+
+    context 'when the user has invalid roles' do
+      let(:user) { instance_double(User, user_roles_names: %w[invalid_role]) }
+
+      it 'returns nil for invalid roles' do
+        result = helper.get_user_roles_list_as_string(user)
+        expect(result).to eq('')
+      end
+    end
+  end
+
+  describe '#get_user_role_ids_list' do
+    context 'when the user has roles' do
+      it 'returns the list of role IDs' do
+        result = helper.get_user_role_ids_list(user)
+        expect(result).to eq(%w[admin doctor health_coach])
+      end
+    end
+
+    context 'when the user has no roles' do
+      let(:user) { instance_double(User, user_roles_names: []) }
+
+      it 'returns an empty array' do
+        result = helper.get_user_role_ids_list(user)
+        expect(result).to eq([])
+      end
+    end
+
+    context 'when the user has invalid roles' do
+      let(:user) { instance_double(User, user_roles_names: %w[invalid_role]) }
+
+      it 'returns the invalid roles as-is' do
+        result = helper.get_user_role_ids_list(user)
+        expect(result).to eq(['invalid_role'])
+      end
+    end
+  end
+end
diff --git a/spec/rails_helper.rb b/spec/rails_helper.rb
index 99ebdaf..fdd0294 100644
--- a/spec/rails_helper.rb
+++ b/spec/rails_helper.rb
@@ -8,6 +8,7 @@
 abort('The Rails environment is running in production mode!') if Rails.env.production?
 require 'rspec/rails'
 # Add additional requires below this line. Rails is not loaded until this point!
+require 'devise'
 
 # Requires supporting ruby files with custom matchers and macros, etc, in
 # spec/support/ and its subdirectories. Files matching `spec/**/*_spec.rb` are
@@ -65,3 +66,7 @@
   # arbitrary gems may also be filtered via:
   # config.filter_gems_from_backtrace("gem name")
 end
+
+RSpec.configure do |config|
+  config.include Devise::Test::IntegrationHelpers, type: :request
+end
diff --git a/spec/requests/admin/users_spec.rb b/spec/requests/admin/users_spec.rb
new file mode 100644
index 0000000..0d3b6c6
--- /dev/null
+++ b/spec/requests/admin/users_spec.rb
@@ -0,0 +1,120 @@
+# frozen_string_literal: true
+
+require 'rails_helper'
+
+RSpec.describe 'Admin::UsersController' do
+  let(:admin) { create(:user, :admin) }
+  let(:user) { create(:user) }
+  let(:valid_attributes) { { first_name: 'John', last_name: 'Doe', email: 'john.doe@example.com' } }
+  let(:invalid_attributes) { { email: '' } }
+  let(:roles) { %w[admin doctor user] }
+
+  before do
+    sign_in admin
+  end
+
+  describe 'GET /index' do
+    it 'renders a successful response' do
+      get admin_users_path
+      expect(response).to be_successful
+    end
+
+    it 'authorizes and displays all users' do
+      users_amount = 3
+      create_list(:user, users_amount)
+      get admin_users_path
+      expect(assigns(:users).count).to eq(users_amount + 1) # Include the admin user
+    end
+  end
+
+  describe 'GET /show' do
+    it 'renders the user details' do
+      get admin_user_path(user)
+      expect(response).to be_successful
+    end
+  end
+
+  describe 'GET /edit' do
+    it 'renders the edit form' do
+      get edit_admin_user_path(user)
+      expect(response).to be_successful
+    end
+  end
+
+  describe 'PATCH /update' do
+    context 'with valid parameters' do
+      it 'redirects to the user page' do
+        patch admin_user_path(user), params: { user: valid_attributes }
+        expect(response).to redirect_to(admin_user_path(user))
+      end
+
+      it 'updates the user attributes' do
+        patch admin_user_path(user), params: { user: valid_attributes }
+        expect(user.reload.first_name).to eq('John')
+      end
+    end
+
+    context 'with invalid parameters' do
+      it 'renders the edit form with errors' do
+        patch admin_user_path(user), params: { user: invalid_attributes }
+        expect(response).to have_http_status(:unprocessable_entity)
+      end
+    end
+  end
+
+  describe 'DELETE /destroy' do
+    it 'deletes the user' do
+      user_to_delete = create(:user)
+      expect do
+        delete admin_user_path(user_to_delete)
+      end.to change(User, :count).by(-1)
+    end
+
+    it 'redirects to the users index' do
+      user_to_delete = create(:user)
+      delete admin_user_path(user_to_delete)
+      expect(response).to redirect_to(admin_users_path)
+    end
+  end
+
+  describe 'GET /edit_roles' do
+    it 'renders the edit roles form' do
+      get edit_roles_admin_user_path(user)
+      expect(response).to be_successful
+    end
+
+    it 'assigns roles list' do
+      roles.each { |role| Role.find_or_create_by!(name: role) } # Prevent duplicate role creation
+      get edit_roles_admin_user_path(user)
+      expect(assigns(:roles)).to match_array(roles.map { |r| [r.capitalize, r] })
+    end
+  end
+
+  describe 'POST /update_roles' do
+    context 'with valid roles' do
+      it 'redirects to the user page' do
+        roles.each { |role| Role.find_or_create_by!(name: role) }
+        post update_roles_admin_user_path(user), params: { user: { roles: %w[admin doctor] } }
+        expect(response).to redirect_to(admin_user_path(user))
+      end
+
+      it 'updates the user roles' do
+        roles.each { |role| Role.find_or_create_by!(name: role) }
+        post update_roles_admin_user_path(user), params: { user: { roles: %w[admin doctor] } }
+        expect(user.reload.roles.map(&:name)).to include('admin', 'doctor')
+      end
+    end
+
+    context 'with invalid roles' do
+      it 'returns an unprocessable entity status' do
+        post update_roles_admin_user_path(user), params: { user: { roles: %w[invalid_role] } }
+        expect(response).to have_http_status(:unprocessable_entity)
+      end
+
+      it 'assigns errors to the user object' do
+        post update_roles_admin_user_path(user), params: { user: { roles: %w[invalid_role] } }
+        expect(assigns(:user).errors[:base]).to include('Invalid roles detected: invalid_role')
+      end
+    end
+  end
+end