diff --git a/core/src/main/java/de/srsoftware/umbrella/core/model/Project.java b/core/src/main/java/de/srsoftware/umbrella/core/model/Project.java
index 19f2c99..a2068d5 100644
--- a/core/src/main/java/de/srsoftware/umbrella/core/model/Project.java
+++ b/core/src/main/java/de/srsoftware/umbrella/core/model/Project.java
@@ -12,7 +12,7 @@ import java.util.*;
 import org.json.JSONObject;
 
 public class Project implements Mappable {
-	private final Collection<Member> members;
+	private final Map<Long,Member> members;
 	private final boolean showClosed;
 	private final Long companyId;
 	private Status status;
@@ -21,7 +21,7 @@ public class Project implements Mappable {
 	private String description;
 	private final Set<String> dirtyFields = new HashSet<>();
 
-	public Project(long id, String name, String description, Status status, Long companyId, boolean showClosed, Collection<Member> members) {
+	public Project(long id, String name, String description, Status status, Long companyId, boolean showClosed, Map<Long,Member> members) {
 		this.id = id;
 		this.name = name;
 		this.description = description;
@@ -44,17 +44,14 @@ public class Project implements Mappable {
 	}
 
 	public boolean hasMember(UmbrellaUser user) {
-		for (var member : members){
-			if (member.user().id() == user.id()) return true;
-		}
-		return false;
+		return members.containsKey(user.id());
 	}
 
 	public long id(){
 		return id;
 	}
 
-	public Collection<Member> members(){
+	public Map<Long,Member> members(){
 			return members;
 	}
 
@@ -64,7 +61,7 @@ public class Project implements Mappable {
 
 	public static Project of(ResultSet rs) throws SQLException {
 		var companyId = rs.getLong(COMPANY_ID);
-		return new Project(rs.getLong(ID),rs.getString(NAME),rs.getString(DESCRIPTION),Status.of(rs.getInt(STATUS)),companyId == 0 ? null : companyId,rs.getBoolean(SHOW_CLOSED),new ArrayList<>());
+		return new Project(rs.getLong(ID),rs.getString(NAME),rs.getString(DESCRIPTION),Status.of(rs.getInt(STATUS)),companyId == 0 ? null : companyId,rs.getBoolean(SHOW_CLOSED),new HashMap<>());
 	}
 
 	public Project patch(JSONObject json) {
@@ -91,13 +88,15 @@ public class Project implements Mappable {
 	@Override
 	public Map<String, Object> toMap() {
 		var map = new HashMap<String, Object>();
+		var memberMap = new HashMap<Long,Map<String,Object>>();
+		for (var entry : members.entrySet()) memberMap.put(entry.getKey(),entry.getValue().toMap());
 		map.put(ID,id);
 		map.put(NAME,name);
 		map.put(DESCRIPTION,Map.of(SOURCE,description,RENDERED,markdown(description)));
 		map.put(STATUS,Map.of(STATUS_CODE,status.code(), NAME,status.name()));
 		map.put(COMPANY_ID,companyId);
 		map.put(SHOW_CLOSED,showClosed);
-		map.put(MEMBERS,members == null ? List.of() : members.stream().map(Member::toMap).toList());
+		map.put(MEMBERS,memberMap);
 		return map;
 	}
 
diff --git a/frontend/src/routes/project/View.svelte b/frontend/src/routes/project/View.svelte
index 6bc4908..c5bccaa 100644
--- a/frontend/src/routes/project/View.svelte
+++ b/frontend/src/routes/project/View.svelte
@@ -108,7 +108,7 @@
             <td>
                 <ul>
                 {#each Object.entries(project.members) as [uid,member]}
-                <li>{member.user.name}: {t('permission.'+member.permission)}</li>
+                <li>{member.user.name}: {t('permission.'+member.permission.name)}</li>
                 {/each}
                 </ul>
             </td>
diff --git a/project/src/main/java/de/srsoftware/umbrella/project/ProjectModule.java b/project/src/main/java/de/srsoftware/umbrella/project/ProjectModule.java
index 971c758..428bdb4 100644
--- a/project/src/main/java/de/srsoftware/umbrella/project/ProjectModule.java
+++ b/project/src/main/java/de/srsoftware/umbrella/project/ProjectModule.java
@@ -152,7 +152,7 @@ public class ProjectModule extends BaseHandler implements ProjectService {
 				var userId = entry.getKey();
 				var permission = entry.getValue();
 				var user = userMap.computeIfAbsent(userId,k -> users.loadUser(userId));
-				project.members().add(new Member(user,permission));
+				project.members().put(userId,new Member(user,permission));
 			}
 		}
 		return projectList;
@@ -187,7 +187,8 @@ public class ProjectModule extends BaseHandler implements ProjectService {
 		if (json.has(SETTINGS) && json.get(SETTINGS) instanceof JSONObject settingsJson){
 			showClosed = settingsJson.has(SHOW_CLOSED) && settingsJson.get(SHOW_CLOSED) == TRUE;
 		}
-		var prj = new Project(0,name,description, OPEN,companyId,showClosed, List.of(new Member(user, OWNER)));
+		var owner = Map.of(user.id(),new Member(user,OWNER));
+		var prj = new Project(0,name,description, OPEN,companyId,showClosed, owner);
 		prj = projects.save(prj);
 		return sendContent(ex,prj);
 	}
diff --git a/project/src/main/java/de/srsoftware/umbrella/project/SqliteDb.java b/project/src/main/java/de/srsoftware/umbrella/project/SqliteDb.java
index 6689ccc..564a6be 100644
--- a/project/src/main/java/de/srsoftware/umbrella/project/SqliteDb.java
+++ b/project/src/main/java/de/srsoftware/umbrella/project/SqliteDb.java
@@ -197,7 +197,7 @@ CREATE TABLE IF NOT EXISTS {0} ( {1} VARCHAR(255) PRIMARY KEY, {2} VARCHAR(255)
 					if (id != null){
 						if (!prj.members().isEmpty()) {
 							var query = insertInto(TABLE_PROJECT_USERS, PROJECT_ID, USER_ID, PERMISSIONS);
-							for (var member : prj.members()) query.values(id, member.user().id(), member.permission().code());
+							for (var member : prj.members().entrySet()) query.values(id, member.getKey(), member.getValue().permission().code());
 							query.execute(db).close();
 						}
 						return new Project(id, prj.name(), prj.description(),prj.status(),prj.companyId().orElse(null),prj.showClosed(),prj.members());