diff --git a/src/main/java/com/webproglabs/lab1/dao/UserRepository.java b/src/main/java/com/webproglabs/lab1/dao/UserRepository.java
index 00ea705..9279fa9 100644
--- a/src/main/java/com/webproglabs/lab1/dao/UserRepository.java
+++ b/src/main/java/com/webproglabs/lab1/dao/UserRepository.java
@@ -7,7 +7,6 @@ import java.util.List;
 import java.util.Optional;
 
 public interface UserRepository extends JpaRepository<User, Long> {
-    List<User> findByLoginLike(String login);
-    User findOneByLoginIgnoreCase(String login);
+    Optional<User>  findOneByLoginIgnoreCase(String login);
     Optional<User> findById(Long Id);
 }
diff --git a/src/main/java/com/webproglabs/lab1/services/CommentService.java b/src/main/java/com/webproglabs/lab1/services/CommentService.java
new file mode 100644
index 0000000..f073a4c
--- /dev/null
+++ b/src/main/java/com/webproglabs/lab1/services/CommentService.java
@@ -0,0 +1,95 @@
+package com.webproglabs.lab1.services;
+
+import com.webproglabs.lab1.dao.CommentRepository;
+import com.webproglabs.lab1.dao.PostRepository;
+import com.webproglabs.lab1.dao.UserRepository;
+import com.webproglabs.lab1.models.Comment;
+import com.webproglabs.lab1.models.Post;
+import com.webproglabs.lab1.models.User;
+import org.springframework.stereotype.Service;
+import org.springframework.util.StringUtils;
+
+import javax.persistence.EntityNotFoundException;
+import javax.transaction.Transactional;
+import java.util.List;
+import java.util.Optional;
+
+@Service
+public class CommentService {
+    private final UserRepository userRepository;
+    private final CommentRepository commentRepository;
+    private final PostRepository postRepository;
+
+    public CommentService(UserRepository profileRepository, CommentRepository commentRepository, PostRepository postRepository) {
+        this.userRepository = profileRepository;
+        this.commentRepository = commentRepository;
+        this.postRepository = postRepository;
+    }
+
+    @Transactional
+    public Comment findCommentById(Long id) {
+        final Optional<Comment> comment = commentRepository.findById(id);
+        return comment.orElseThrow(EntityNotFoundException::new);
+    }
+
+    @Transactional
+    public List<Comment> findAllComments() {
+        return commentRepository.findAll();
+    }
+
+    @Transactional
+    public List<Post> findFilteredComments(String filter) {
+        List<Post> postList = postRepository.findByTextLike("%" + filter + "%");
+        List<Comment> commentList = commentRepository.findByTextLike("%" + filter + "%");
+        List<Post> allPosts = postRepository.findAll();
+        for(Post post : allPosts) {
+            for (Comment comm : commentList) {
+                if (post.getComments().contains(comm) && !(postList.contains(post))) {
+                    postList.add(post);
+                }
+            }
+        }
+        return postList;
+    }
+
+    @Transactional
+    public Comment addComment(String text, Long userId, Long postId) {
+        if (!StringUtils.hasText(text)) {
+            throw new IllegalArgumentException("Comment data is null or empty");
+        }
+        try{
+            User user = userRepository.findById(userId).get();
+            Post post = postRepository.findById(postId).get();
+            Comment comment = new Comment(text, user, post);
+            user.addComment(comment);
+            post.addComment(comment);
+            userRepository.save(user);
+            postRepository.save(post);
+            return commentRepository.save(comment);
+        }
+        catch (Exception exception) {
+            return null;
+        }
+    }
+
+    @Transactional
+    public Comment updateComment(Long id, String text) {
+        if (!StringUtils.hasText(text)) {
+            throw new IllegalArgumentException("Comment data is null or empty");
+        }
+        Comment currentComment = findCommentById(id);
+        currentComment.setText(text);
+        final User owner = currentComment.getOwner();
+        userRepository.save(owner);
+        final Post post = currentComment.getPost();
+        postRepository.save(post);
+        return commentRepository.save(currentComment);
+    }
+
+    @Transactional
+    public Comment deleteComment(Long id) {
+        final Comment currentComment = findCommentById(id);
+        commentRepository.delete(currentComment);
+        return currentComment;
+    }
+}
diff --git a/src/main/java/com/webproglabs/lab1/services/PostService.java b/src/main/java/com/webproglabs/lab1/services/PostService.java
new file mode 100644
index 0000000..2cf1a08
--- /dev/null
+++ b/src/main/java/com/webproglabs/lab1/services/PostService.java
@@ -0,0 +1,95 @@
+package com.webproglabs.lab1.services;
+
+import com.webproglabs.lab1.dao.CommentRepository;
+import com.webproglabs.lab1.dao.PostRepository;
+import com.webproglabs.lab1.dao.TopicRepository;
+import com.webproglabs.lab1.dao.UserRepository;
+import com.webproglabs.lab1.models.Comment;
+import com.webproglabs.lab1.models.Post;
+import com.webproglabs.lab1.models.Topic;
+import com.webproglabs.lab1.models.User;
+import org.springframework.stereotype.Service;
+import org.springframework.util.StringUtils;
+
+import javax.persistence.EntityNotFoundException;
+import javax.transaction.Transactional;
+import java.util.List;
+import java.util.Optional;
+
+@Service
+public class PostService {
+    private final PostRepository postRepository;
+    private final CommentRepository commentRepository;
+    private final UserRepository userRepository;
+
+    private final TopicRepository topicRepository;
+
+    public PostService(PostRepository postRepository, CommentRepository commentRepository, UserRepository userRepository, TopicRepository topicRepository) {
+        this.postRepository = postRepository;
+        this.commentRepository = commentRepository;
+        this.userRepository = userRepository;
+        this.topicRepository = topicRepository;
+    }
+
+    @Transactional
+    public Post findPostById(Long id) {
+        final Optional<Post> post = postRepository.findById(id);
+        return post.orElseThrow(EntityNotFoundException::new);
+    }
+
+    @Transactional
+    public List<Post> findAllPosts() {
+        return postRepository.findAll();
+    }
+
+    @Transactional
+    public List<Post> findFilteredPosts(String filter) {
+        List<Post> postList = postRepository.findByTextLike("%" + filter + "%");
+        List<Comment> commentList = commentRepository.findByTextLike("%" + filter + "%");
+        List<Post> allPosts = postRepository.findAll();
+        for(Post post : allPosts) {
+            for (Comment comm : commentList) {
+                if (post.getComments().contains(comm) && !(postList.contains(post))) {
+                    postList.add(post);
+                }
+            }
+        }
+        return postList;
+    }
+
+    @Transactional
+    public Post addPost (String text, Long authorId, Long topicId) {
+        if (!StringUtils.hasText(text)) {
+            throw new IllegalArgumentException("Post data is null or empty");
+        }
+        User author = userRepository.findById(authorId).get();
+        Topic topic = topicRepository.findById(topicId).get();
+        Post post = new Post(text, author, topic);
+        author.addPost(post);
+        topic.addPost(post);
+        userRepository.save(author);
+        topicRepository.save(topic);
+        return postRepository.save(post);
+    }
+
+    @Transactional
+    public Post updatePost(Long id, String text) {
+        if (!StringUtils.hasText(text)) {
+            throw new IllegalArgumentException("Post data is null or empty");
+        }
+        final Post currentPost = findPostById(id);
+        currentPost.setText(text);
+        final User author = currentPost.getAuthor();
+        userRepository.save(author);
+        final Topic topic = currentPost.getTopic();
+        topicRepository.save(topic);
+        return postRepository.save(currentPost);
+    }
+
+    @Transactional
+    public Post deletePost(Long id) {
+        final Post currentPost = findPostById(id);
+        postRepository.delete(currentPost);
+        return currentPost;
+    }
+}
diff --git a/src/main/java/com/webproglabs/lab1/services/TopicService.java b/src/main/java/com/webproglabs/lab1/services/TopicService.java
new file mode 100644
index 0000000..d2e2f0c
--- /dev/null
+++ b/src/main/java/com/webproglabs/lab1/services/TopicService.java
@@ -0,0 +1,62 @@
+package com.webproglabs.lab1.services;
+
+import com.webproglabs.lab1.dao.TopicRepository;
+import com.webproglabs.lab1.models.Post;
+import com.webproglabs.lab1.models.Topic;
+import org.springframework.stereotype.Service;
+import org.springframework.util.StringUtils;
+
+import javax.persistence.EntityNotFoundException;
+import javax.transaction.Transactional;
+import java.util.List;
+
+@Service
+public class TopicService {
+    private final TopicRepository topicRepository;
+
+    public TopicService(TopicRepository topicRepository) {
+        this.topicRepository = topicRepository;
+    }
+
+    @Transactional
+    public Topic addTopic(String name, String description) {
+        if (!StringUtils.hasText(name) || !StringUtils.hasText(description)) {
+            throw new IllegalArgumentException("Name is null or empty");
+        }
+        final Topic topic = new Topic(name, description);
+        return topicRepository.save(topic);
+    }
+
+    @Transactional
+    public Topic findTopicById(Long id) {
+        final Topic topic = topicRepository.findById(id).orElse(null);
+        if (topic == null) {
+            throw new EntityNotFoundException(String.format(" topic with id [%s] is not found", id));
+        }
+        return topic;
+    }
+
+    @Transactional
+    public List<Topic> findAllTopics() {
+        return topicRepository.findAll();
+    }
+
+    @Transactional
+    public Topic updateTopic(Long id, String name, String description) {
+        if (!StringUtils.hasText(name) || !StringUtils.hasText(description)) {
+            throw new IllegalArgumentException("Name is null or empty");
+        }
+        final Topic topic = findTopicById(id);
+        topic.setName(name);
+        topic.setDescription(description);
+        return topicRepository.save(topic);
+    }
+
+    @Transactional
+    public Topic deleteTopic(Long id) {
+        final Topic topic = findTopicById(id);
+        topicRepository.delete(topic);
+        return topic;
+    }
+
+}
diff --git a/src/main/java/com/webproglabs/lab1/services/UserService.java b/src/main/java/com/webproglabs/lab1/services/UserService.java
new file mode 100644
index 0000000..564614a
--- /dev/null
+++ b/src/main/java/com/webproglabs/lab1/services/UserService.java
@@ -0,0 +1,92 @@
+package com.webproglabs.lab1.services;
+
+import com.webproglabs.lab1.dao.UserRepository;
+import com.webproglabs.lab1.models.User;
+import com.webproglabs.lab1.models.UserRole;
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.security.core.userdetails.UserDetailsService;
+import org.springframework.security.core.userdetails.UsernameNotFoundException;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.stereotype.Service;
+import org.springframework.util.StringUtils;
+
+import javax.persistence.EntityNotFoundException;
+import javax.transaction.Transactional;
+import java.util.Collections;
+import java.util.List;
+import java.util.Objects;
+import java.util.Optional;
+
+@Service
+public class UserService implements UserDetailsService {
+    private final UserRepository userRepository;
+    private final PasswordEncoder passwordEncoder;
+
+    public UserService(UserRepository userRepository, PasswordEncoder passwordEncoder) {
+        this.userRepository = userRepository;
+        this.passwordEncoder = passwordEncoder;
+    }
+
+    @Transactional
+    public User findUserById(Long id) {
+        final Optional<User> user = userRepository.findById(id);
+        return user.orElseThrow(EntityNotFoundException::new);
+    }
+
+    @Transactional
+    public User findUserByLogin(String login) {
+        final Optional<User> user = userRepository.findOneByLoginIgnoreCase(login);
+        return user.orElseThrow(EntityNotFoundException::new);
+    }
+
+    @Transactional
+    public List<User> findAllUsers() {
+        return userRepository.findAll();
+    }
+
+    @Transactional
+    public User createUser(String login, String password, String passwordConfirm, UserRole role) {
+        if (findUserByLogin(login) != null) {
+            throw new IllegalArgumentException("User " + login + " already exists");
+        }
+        final User user = new User(login, passwordEncoder.encode(password), role);
+        if (!Objects.equals(password, passwordConfirm)) {
+            throw new IllegalArgumentException("Passwords not equals");
+        }
+        return userRepository.save(user);
+    }
+
+    @Transactional
+    public User createUser(String login, String password, String passwordConfirm) {
+        return createUser(login, password, passwordConfirm, UserRole.USER);
+    }
+
+    @Transactional
+    public User updateUser(Long id, String login, String password) {
+        if (!StringUtils.hasText(login) || !StringUtils.hasText(password)) {
+            throw new IllegalArgumentException("User data is null or empty");
+        }
+        final User currentUser = findUserById(id);
+        currentUser.setLogin(login);
+        currentUser.setPassword(password);
+        return userRepository.save(currentUser);
+    }
+
+    @Transactional
+    public User deleteUser(Long id) {
+        final User currentUser = findUserById(id);
+        userRepository.delete(currentUser);
+        return currentUser;
+    }
+
+
+    @Override
+    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
+        final User userEntity = findUserByLogin(username);
+        if (userEntity == null) {
+            throw new UsernameNotFoundException(username);
+        }
+        return new org.springframework.security.core.userdetails.User(
+                userEntity.getLogin(), userEntity.getPassword(), Collections.singleton(userEntity.getRole()));
+    }
+}