diff --git a/server/config/info.py b/server/config/info.py
index 8ccf634..529b77a 100644
--- a/server/config/info.py
+++ b/server/config/info.py
@@ -3,6 +3,8 @@ from os import getenv
 from pathlib import Path
 from version import __version__
 
+from config import config
+
 root = Path(__file__).parent.parent
 
 
@@ -35,3 +37,7 @@ def get_commit_number():
 @lru_cache()
 def get_deployment_type() -> str:
     return _get("DEPLOY", env_suffix="DEPLOYMENT_TYPE", default="manual")
+
+
+def get_default_company():
+    return config.get("apiserver.default_company")
diff --git a/server/init_data.py b/server/init_data.py
index b4ac8a8..7e2f578 100644
--- a/server/init_data.py
+++ b/server/init_data.py
@@ -11,6 +11,7 @@ from semantic_version import Version
 import database.utils
 from bll.queue import QueueBLL
 from config import config
+from config.info import get_default_company
 from database import Database
 from database.model.auth import Role
 from database.model.auth import User as AuthUser, Credentials
@@ -49,7 +50,7 @@ def init_es_data():
 
 
 def _ensure_company():
-    company_id = config.get("apiserver.default_company")
+    company_id = get_default_company()
     company = Company.objects(id=company_id).only("id").first()
     if company:
         return company_id
@@ -211,6 +212,7 @@ def init_mongo_data():
 
         if FixedUser.enabled():
             log.info("Fixed users mode is enabled")
+            FixedUser.validate()
             for user in FixedUser.from_config():
                 try:
                     _ensure_user(user, company_id)
diff --git a/server/service_repo/auth/fixed_user.py b/server/service_repo/auth/fixed_user.py
index c4fd1ea..a4188ba 100644
--- a/server/service_repo/auth/fixed_user.py
+++ b/server/service_repo/auth/fixed_user.py
@@ -5,27 +5,45 @@ from typing import Sequence, TypeVar
 import attr
 
 from config import config
+from config.info import get_default_company
 
 T = TypeVar("T", bound="FixedUser")
 
 
+class FixedUsersError(Exception):
+    pass
+
+
 @attr.s(auto_attribs=True)
 class FixedUser:
     username: str
     password: str
     name: str
+    company: str = get_default_company()
 
     def __attrs_post_init__(self):
-        self.user_id = hashlib.md5(f"{self.username}:{self.password}".encode()).hexdigest()
+        self.user_id = hashlib.md5(f"{self.company}:{self.username}".encode()).hexdigest()
 
     @classmethod
     def enabled(cls):
         return config.get("apiserver.auth.fixed_users.enabled", False)
 
+    @classmethod
+    def validate(cls):
+        if not cls.enabled():
+            return
+        users = cls.from_config()
+        if len({user.username for user in users}) < len(users):
+            raise FixedUsersError(
+                "Duplicate user names found in fixed users configuration"
+            )
+
     @classmethod
     @lru_cache()
     def from_config(cls) -> Sequence[T]:
-        return [cls(**user) for user in config.get("apiserver.auth.fixed_users.users", [])]
+        return [
+            cls(**user) for user in config.get("apiserver.auth.fixed_users.users", [])
+        ]
 
     @classmethod
     @lru_cache()