diff --git a/backend/src/main/java/com/example/backend/users/api/UserDTO.java b/backend/src/main/java/com/example/backend/users/api/UserDTO.java
new file mode 100644
index 0000000..7acdef3
--- /dev/null
+++ b/backend/src/main/java/com/example/backend/users/api/UserDTO.java
@@ -0,0 +1,53 @@
+package com.example.backend.users.api;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.NotNull;
+
+public class UserDTO {
+
+    private Integer id;
+
+    @NotBlank
+    private String username;
+
+    @NotBlank
+    private String password;
+
+    @NotNull
+    private boolean isAdmin;
+
+    @JsonProperty(access = JsonProperty.Access.READ_ONLY)
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public void setPassword(String password) {
+        this.password = password;
+    }
+
+    public boolean getIsAdmin() {
+        return isAdmin;
+    }
+
+    public void setIsAdmin(boolean isAdmin) {
+        this.isAdmin = isAdmin;
+    }
+}
diff --git a/backend/src/main/java/com/example/backend/users/service/UserService.java b/backend/src/main/java/com/example/backend/users/service/UserService.java
new file mode 100644
index 0000000..4eda0d2
--- /dev/null
+++ b/backend/src/main/java/com/example/backend/users/service/UserService.java
@@ -0,0 +1,45 @@
+package com.example.backend.users.service;
+
+import java.util.List;
+import java.util.Optional;
+
+import org.springframework.stereotype.Service;
+
+import com.example.backend.core.errors.NotFoundException;
+import com.example.backend.users.model.UserEntity;
+import com.example.backend.users.repository.UserRepository;
+
+@Service
+public class UserService {
+    private final UserRepository repository;
+
+    public UserService(UserRepository repository) {
+        this.repository = repository;
+    }
+
+    public List<UserEntity> getAll() {
+        return repository.getAll();
+    }
+
+    public UserEntity get(Integer id) {
+        return Optional.ofNullable(repository.get(id)).orElseThrow(() -> new NotFoundException(id));
+    }
+
+    public UserEntity create(UserEntity entity) {
+        return repository.create(entity);
+    }
+
+    public UserEntity update(Integer id, UserEntity entity) {
+        final UserEntity existsentity = get(id);
+        existsentity.setUsername(entity.getUsername());
+        existsentity.setPassword(entity.getPassword());
+        existsentity.setIsAdmin(entity.getIsAdmin());
+        return repository.update(existsentity);
+    }
+
+    public UserEntity delete(Integer id) {
+        final UserEntity existsentity = get(id);
+        return repository.delete(existsentity);
+    }
+
+}