diff --git a/postman_collection.json b/postman_collection.json
new file mode 100644
index 0000000..cf31dd4
--- /dev/null
+++ b/postman_collection.json
@@ -0,0 +1,165 @@
+{
+  "info": {
+    "_postman_id": "809992e0-63cb-4d98-ae6b-30e259a35348",
+    "name": "Reactive Timesheet App",
+    "schema": "https://schema.getpostman.com/json/collection/v2.1.0/collection.json"
+  },
+  "item": [
+    {
+      "name": "Get user by id",
+      "protocolProfileBehavior": {
+        "disableBodyPruning": true
+      },
+      "request": {
+        "method": "GET",
+        "header": [],
+        "body": {
+          "mode": "raw",
+          "raw": "{\r\n        \"username\" : \"John Test\",\r\n        \"password\" : \"223eded3\",\r\n        \"passwordConfirmation\" : \"223eded3\",\r\n        \"role\" : \"LEAD\"\r\n}",
+          "options": {
+            "raw": {
+              "language": "json"
+            }
+          }
+        },
+        "url": {
+          "raw": "http://localhost:8080/users/id/62378d381507b40858b58695",
+          "protocol": "http",
+          "host": [
+            "localhost"
+          ],
+          "port": "8080",
+          "path": [
+            "users",
+            "id",
+            "62378d381507b40858b58695"
+          ]
+        }
+      },
+      "response": []
+    },
+    {
+      "name": "Get user by name",
+      "protocolProfileBehavior": {
+        "disableBodyPruning": true
+      },
+      "request": {
+        "method": "GET",
+        "header": [],
+        "body": {
+          "mode": "raw",
+          "raw": "{\r\n        \"username\" : \"John Test\",\r\n        \"password\" : \"223eded3\",\r\n        \"passwordConfirmation\" : \"223eded3\",\r\n        \"role\" : \"LEAD\"\r\n}",
+          "options": {
+            "raw": {
+              "language": "json"
+            }
+          }
+        },
+        "url": {
+          "raw": "http://localhost:8080/users/id/62378d381507b40858b58695",
+          "protocol": "http",
+          "host": [
+            "localhost"
+          ],
+          "port": "8080",
+          "path": [
+            "users",
+            "id",
+            "62378d381507b40858b58695"
+          ]
+        }
+      },
+      "response": []
+    },
+    {
+      "name": "Create user",
+      "request": {
+        "method": "POST",
+        "header": [],
+        "body": {
+          "mode": "raw",
+          "raw": "{\r\n        \"username\" : \"John Test\",\r\n        \"password\" : \"223eded3\",\r\n        \"passwordConfirmation\" : \"223eded3\",\r\n        \"role\" : \"LEAD\"\r\n}",
+          "options": {
+            "raw": {
+              "language": "json"
+            }
+          }
+        },
+        "url": {
+          "raw": "http://localhost:8080/users/",
+          "protocol": "http",
+          "host": [
+            "localhost"
+          ],
+          "port": "8080",
+          "path": [
+            "users",
+            ""
+          ]
+        }
+      },
+      "response": []
+    },
+    {
+      "name": "Create team",
+      "request": {
+        "method": "GET",
+        "header": []
+      },
+      "response": []
+    },
+    {
+      "name": "delete team",
+      "request": {
+        "method": "GET",
+        "header": []
+      },
+      "response": []
+    },
+    {
+      "name": "delete user",
+      "request": {
+        "method": "GET",
+        "header": []
+      },
+      "response": []
+    },
+    {
+      "name": "creating of the new time entry",
+      "request": {
+        "method": "POST",
+        "header": [],
+        "body": {
+          "mode": "raw",
+          "raw": "{\r\n  \"date\" : \"1999-12-12\",\r\n  \"timeFrom\" : \" \",\r\n  \"timeTo\" : \" \",\r\n  \"user\" : {\r\n    \"username\": \"Arnold Test\",\r\n    \"password\": \"223eded3\",\r\n    \"role\": \"DEVELOPER\"\r\n  },\r\n  \"category\": \"DEVELOPMENT\" \r\n}",
+          "options": {
+            "raw": {
+              "language": "json"
+            }
+          }
+        },
+        "url": {
+          "raw": "http://localhost:8080/team-entries/",
+          "protocol": "http",
+          "host": [
+            "localhost"
+          ],
+          "port": "8080",
+          "path": [
+            "team-entries",
+            ""
+          ]
+        }
+      },
+      "response": []
+    },
+    {
+      "name": "get team by id",
+      "request": {
+        "method": "GET",
+        "header": []
+      },
+      "response": []
+    }
+  ]
+}
\ No newline at end of file
diff --git a/src/main/java/net/szymonsawicki/reactivetimesheetapp/application/service/TeamService.java b/src/main/java/net/szymonsawicki/reactivetimesheetapp/application/service/TeamService.java
index 50c0c1e..c222ff7 100644
--- a/src/main/java/net/szymonsawicki/reactivetimesheetapp/application/service/TeamService.java
+++ b/src/main/java/net/szymonsawicki/reactivetimesheetapp/application/service/TeamService.java
@@ -46,12 +46,10 @@ public class TeamService {
 
     private Mono<GetTeamDto> createTeamWithMembers(CreateTeamDto createTeamDto) {
 
-        var teamToInsert = createTeamDto.toTeam();
-
         // at first team is inserted into db and all its member are updated with the new teamId
 
         return teamRepository
-                .save(teamToInsert)
+                .save(createTeamDto.toTeam())
                 .flatMap(insertedTeam -> {
                     var membersToInsert = createTeamDto
                             .members()
@@ -64,12 +62,9 @@ public class TeamService {
                     return userRepository
                             .saveAll(membersToInsert)
                             .collectList()
-                            .flatMap(insertedUsers -> {
-                                var teamToInsertWithMembers = insertedTeam.withMembers(insertedUsers);
-                                return teamRepository
-                                        .save(teamToInsertWithMembers)
-                                        .map(Team::toGetTeamDto);
-                            });
+                            .flatMap(insertedUsers -> teamRepository
+                                    .save(insertedTeam.withMembers(insertedUsers))
+                                    .map(Team::toGetTeamDto));
                 });
     }
 
@@ -94,5 +89,4 @@ public class TeamService {
                 })
                 .switchIfEmpty(Mono.error(new TeamServiceException("cannot find team to delete")));
     }
-
 }
diff --git a/src/main/java/net/szymonsawicki/reactivetimesheetapp/application/service/TimeEntryService.java b/src/main/java/net/szymonsawicki/reactivetimesheetapp/application/service/TimeEntryService.java
index 296de57..117f63f 100644
--- a/src/main/java/net/szymonsawicki/reactivetimesheetapp/application/service/TimeEntryService.java
+++ b/src/main/java/net/szymonsawicki/reactivetimesheetapp/application/service/TimeEntryService.java
@@ -33,7 +33,7 @@ public class TimeEntryService {
         return userRepository
                 .findById(timeEntryToCheck.user().id())
                 .hasElement()
-                .flatMap(isUserPresent -> Boolean.TRUE.equals(isUserPresent)
+                .flatMap(isUserPresent -> isUserPresent
                         ?
                         findCollisions(timeEntryToCheck)
                         :
@@ -41,6 +41,9 @@ public class TimeEntryService {
     }
 
     private Mono<CreateTimeEntryDto> findCollisions(CreateTimeEntryDto timeEntryToCheck) {
+
+        // TODO proper implementation of collision check (doesn't work at the moment). Create isAvailable() method in TimeEntry domain class
+
         return timeEntryRepository.findAllByUser(timeEntryToCheck.user().toUser())
                 .filter(entry -> !TimeEntryUtils.toTimeFrom.apply(entry).isAfter(timeEntryToCheck.timeTo())
                         && !TimeEntryUtils.toTimeTo.apply(entry).isBefore(timeEntryToCheck.timeFrom()))
diff --git a/src/main/java/net/szymonsawicki/reactivetimesheetapp/application/service/UserService.java b/src/main/java/net/szymonsawicki/reactivetimesheetapp/application/service/UserService.java
index 2ccc36f..1fb7686 100644
--- a/src/main/java/net/szymonsawicki/reactivetimesheetapp/application/service/UserService.java
+++ b/src/main/java/net/szymonsawicki/reactivetimesheetapp/application/service/UserService.java
@@ -38,7 +38,7 @@ public class UserService {
                 .flatMap(createUserDto -> userRepository
                         .findByUsername(createUserDto.username())
                         .hasElement()
-                        .flatMap(isUserPresent -> Boolean.TRUE.equals(isUserPresent)
+                        .flatMap(isUserPresent -> isUserPresent
                                 ?
                                 Mono.error(new UserServiceException("user with username " + createUserDto.username() + " already exists"))
                                 :