diff --git a/dao/src/permission.rs b/dao/src/permission.rs
index f5189af..391a351 100644
--- a/dao/src/permission.rs
+++ b/dao/src/permission.rs
@@ -26,6 +26,7 @@ pub trait PermissionDao {
 
     async fn create_user(&self, user: &UserEntity, process: &str) -> Result<(), DaoError>;
     async fn all_users(&self) -> Result<Arc<[UserEntity]>, DaoError>;
+    async fn find_user(&self, username: &str) -> Result<Option<UserEntity>, DaoError>;
     async fn delete_user(&self, username: &str) -> Result<(), DaoError>;
 
     async fn create_role(&self, role: &RoleEntity, process: &str) -> Result<(), DaoError>;
diff --git a/dao/src/sales_person.rs b/dao/src/sales_person.rs
index 1c2a505..c7dd821 100644
--- a/dao/src/sales_person.rs
+++ b/dao/src/sales_person.rs
@@ -20,6 +20,10 @@ pub struct SalesPersonEntity {
 pub trait SalesPersonDao {
     async fn all(&self) -> Result<Arc<[SalesPersonEntity]>, DaoError>;
     async fn find_by_id(&self, id: Uuid) -> Result<Option<SalesPersonEntity>, DaoError>;
+    async fn find_by_user(&self, user_id: &str) -> Result<Option<SalesPersonEntity>, DaoError>;
     async fn create(&self, entity: &SalesPersonEntity, process: &str) -> Result<(), DaoError>;
     async fn update(&self, entity: &SalesPersonEntity, process: &str) -> Result<(), DaoError>;
+    async fn get_assigned_user(&self, sales_person_id: Uuid) -> Result<Option<Arc<str>>, DaoError>;
+    async fn assign_to_user(&self, sales_person_id: Uuid, user_id: &str, process: &str) -> Result<(), DaoError>;
+    async fn discard_assigned_user(&self, sales_person_id: Uuid) -> Result<(), DaoError>;
 }
diff --git a/dao_impl/src/lib.rs b/dao_impl/src/lib.rs
index 3919680..988bf4f 100644
--- a/dao_impl/src/lib.rs
+++ b/dao_impl/src/lib.rs
@@ -91,6 +91,18 @@ impl dao::PermissionDao for PermissionDaoImpl {
             .map_db_error()?;
         Ok(())
     }
+    async fn find_user(&self, username: &str) -> Result<Option<dao::UserEntity>, DaoError> {
+        let result = query!(
+            r"SELECT name FROM user WHERE name = ?",
+            username
+        )
+        .fetch_optional(self.pool.as_ref())
+        .await
+        .map_db_error()?;
+        Ok(result.map(|row| dao::UserEntity {
+            name: row.name.clone().into(),
+        }))
+    }
 
     async fn create_role(&self, role: &dao::RoleEntity, process: &str) -> Result<(), DaoError> {
         let name = role.name.as_ref();
diff --git a/dao_impl/src/sales_person.rs b/dao_impl/src/sales_person.rs
index f230b03..df23339 100644
--- a/dao_impl/src/sales_person.rs
+++ b/dao_impl/src/sales_person.rs
@@ -72,6 +72,21 @@ impl SalesPersonDao for SalesPersonDaoImpl {
         .map(SalesPersonEntity::try_from)
         .transpose()?)
     }
+
+    async fn find_by_user(&self, user_id: &str) -> Result<Option<SalesPersonEntity>, DaoError> {
+        Ok(query_as!(
+            SalesPersonDb,
+            "SELECT sp.id, sp.name, sp.inactive, sp.deleted, sp.update_version FROM sales_person sp JOIN sales_person_user spu ON sp.id = spu.sales_person_id WHERE spu.user_id = ?",
+            user_id
+        )
+        .fetch_optional(self.pool.as_ref())
+        .await
+        .map_db_error()?
+        .as_ref()
+        .map(SalesPersonEntity::try_from)
+        .transpose()?)
+    }
+
     async fn create(&self, entity: &SalesPersonEntity, process: &str) -> Result<(), DaoError> {
         let id = entity.id.as_bytes().to_vec();
         let version = entity.version.as_bytes().to_vec();
@@ -96,4 +111,34 @@ impl SalesPersonDao for SalesPersonDaoImpl {
             .map_db_error()?;
         Ok(())
     }
+
+    async fn assign_to_user(&self, sales_person_id: Uuid, user_id: &str, process: &str) -> Result<(), DaoError> {
+        let sales_person_id = sales_person_id.as_bytes().to_vec();
+        query!("INSERT INTO sales_person_user (user_id, sales_person_id, update_process) VALUES (?, ?, ?)", user_id, sales_person_id, process)
+            .execute(self.pool.as_ref())
+            .await
+            .map_db_error()?;
+        Ok(())
+    }
+
+    async fn discard_assigned_user(&self, sales_person_id: Uuid) -> Result<(), DaoError> {
+        let sales_person_id = sales_person_id.as_bytes().to_vec();
+        query!("DELETE FROM sales_person_user WHERE sales_person_id = ?", sales_person_id)
+            .execute(self.pool.as_ref())
+            .await
+            .map_db_error()?;
+        Ok(())
+    }
+
+    async fn get_assigned_user(&self, sales_person_id: Uuid) -> Result<Option<Arc<str>>, DaoError> {
+        let sales_person_id = sales_person_id.as_bytes().to_vec();
+        Ok(query!(
+            "SELECT user_id FROM sales_person_user WHERE sales_person_id = ?",
+            sales_person_id
+        )
+        .fetch_optional(self.pool.as_ref())
+        .await
+        .map_db_error()?
+        .map(|result| result.user_id.into()))
+    }
 }
diff --git a/migrations/20240506114107_add_sales_person.sql b/migrations/20240506114107_add_sales_person.sql
index 342fd70..96520c2 100644
--- a/migrations/20240506114107_add_sales_person.sql
+++ b/migrations/20240506114107_add_sales_person.sql
@@ -9,4 +9,16 @@ CREATE TABLE sales_person (
     update_timestamp TEXT,
     update_process TEXT NOT NULL,
     update_version blob(16) NOT NULL
-);
\ No newline at end of file
+);
+
+CREATE TABLE sales_person_user (
+    sales_person_id blob(16) NOT NULL,
+    user_id TEXT NOT NULL,
+    update_timestamp TEXT,
+    update_process TEXT NOT NULL,
+    PRIMARY KEY (sales_person_id, user_id),
+    UNIQUE(sales_person_id),
+    UNIQUE(user_id),
+    FOREIGN KEY (sales_person_id) REFERENCES sales_person(id)
+    FOREIGN KEY (user_id) REFERENCES user(name)
+)
\ No newline at end of file
diff --git a/rest/src/sales_person.rs b/rest/src/sales_person.rs
index 392c769..4561dab 100644
--- a/rest/src/sales_person.rs
+++ b/rest/src/sales_person.rs
@@ -55,6 +55,9 @@ pub fn generate_route<RestState: RestStateDef>() -> Router<RestState> {
         .route("/", post(create_sales_person::<RestState>))
         .route("/:id", put(update_sales_person::<RestState>))
         .route("/:id", delete(delete_sales_person::<RestState>))
+        .route("/:id/user", get(get_sales_person_user::<RestState>))
+        .route("/:id/user", post(set_sales_person_user::<RestState>))
+        .route("/:id/user", delete(delete_sales_person_user::<RestState>))
 }
 
 pub async fn get_all_sales_persons<RestState: RestStateDef>(
@@ -158,3 +161,56 @@ pub async fn delete_sales_person<RestState: RestStateDef>(
         .await,
     )
 }
+
+
+pub async fn get_sales_person_user<RestState: RestStateDef>(
+    rest_state: State<RestState>,
+    Path(sales_person_id): Path<Uuid>,
+) -> Response {
+    error_handler(
+        (async {
+            let user = rest_state
+                .sales_person_service()
+                .get_assigned_user(sales_person_id, ())
+                .await?;
+            Ok(Response::builder()
+                .status(200)
+                .body(Body::new(serde_json::to_string(&user).unwrap()))
+                .unwrap())
+        })
+        .await,
+    )
+}
+
+pub async fn set_sales_person_user<RestState: RestStateDef>(
+    rest_state: State<RestState>,
+    Path(sales_person_id): Path<Uuid>,
+    Json(user): Json<Arc<str>>,
+) -> Response {
+    error_handler(
+        (async {
+            rest_state
+                .sales_person_service()
+                .set_user(sales_person_id, user.into(), ())
+                .await?;
+            Ok(Response::builder().status(204).body(Body::empty()).unwrap())
+        })
+        .await,
+    )
+}
+
+pub async fn delete_sales_person_user<RestState: RestStateDef>(
+    rest_state: State<RestState>,
+    Path(sales_person_id): Path<Uuid>,
+) -> Response {
+    error_handler(
+        (async {
+            rest_state
+                .sales_person_service()
+                .set_user(sales_person_id, None, ())
+                .await?;
+            Ok(Response::builder().status(204).body(Body::empty()).unwrap())
+        })
+        .await,
+    )
+}
\ No newline at end of file
diff --git a/service/src/permission.rs b/service/src/permission.rs
index 45476e1..eb8b939 100644
--- a/service/src/permission.rs
+++ b/service/src/permission.rs
@@ -53,6 +53,7 @@ pub trait PermissionService {
     ) -> Result<(), ServiceError>;
 
     async fn create_user(&self, user: &str, context: Self::Context) -> Result<(), ServiceError>;
+    async fn user_exists(&self, user: &str, context: Self::Context) -> Result<bool, ServiceError>;
     async fn delete_user(&self, user: &str, context: Self::Context) -> Result<(), ServiceError>;
     async fn get_all_users(&self, context: Self::Context) -> Result<Arc<[User]>, ServiceError>;
 
diff --git a/service/src/sales_person.rs b/service/src/sales_person.rs
index b3ac790..a68c2ce 100644
--- a/service/src/sales_person.rs
+++ b/service/src/sales_person.rs
@@ -56,4 +56,15 @@ pub trait SalesPersonService {
         context: Self::Context,
     ) -> Result<SalesPerson, ServiceError>;
     async fn delete(&self, id: Uuid, context: Self::Context) -> Result<(), ServiceError>;
+    async fn get_assigned_user(
+        &self,
+        sales_person_id: Uuid,
+        context: Self::Context,
+    ) -> Result<Option<Arc<str>>, ServiceError>;
+    async fn set_user(
+        &self,
+        sales_person_id: Uuid,
+        user_id: Option<Arc<str>>,
+        context: Self::Context,
+    ) -> Result<(), ServiceError>;
 }
diff --git a/service_impl/src/permission.rs b/service_impl/src/permission.rs
index ffa9561..e72eda2 100644
--- a/service_impl/src/permission.rs
+++ b/service_impl/src/permission.rs
@@ -1,6 +1,7 @@
 use std::sync::Arc;
 
 use async_trait::async_trait;
+use service::ServiceError;
 
 pub struct PermissionServiceImpl<PermissionDao, UserService>
 where
@@ -75,6 +76,11 @@ where
         Ok(())
     }
 
+    async fn user_exists(&self, user: &str, context: Self::Context) -> Result<bool, ServiceError> {
+        self.check_permission("hr", context).await?;
+        Ok(self.permission_dao.find_user(user).await.map(|x| x.is_some())?)
+    }
+
     async fn get_all_users(
         &self,
         context: Self::Context,
diff --git a/service_impl/src/sales_person.rs b/service_impl/src/sales_person.rs
index 4553556..e8a279f 100644
--- a/service_impl/src/sales_person.rs
+++ b/service_impl/src/sales_person.rs
@@ -188,4 +188,36 @@ where
             .await?;
         Ok(())
     }
+
+    async fn get_assigned_user(
+        &self,
+        sales_person_id: Uuid,
+        context: Self::Context,
+    ) -> Result<Option<Arc<str>>, ServiceError> {
+        self.permission_service
+            .check_permission("hr", context)
+            .await?;
+        Ok(self.sales_person_dao.get_assigned_user(sales_person_id).await?)
+    }
+
+    async fn set_user(
+        &self,
+        sales_person_id: Uuid,
+        user_id: Option<Arc<str>>,
+        context: Self::Context,
+    ) -> Result<(), ServiceError> {
+        self.permission_service
+            .check_permission("hr", context)
+            .await?;
+        self.sales_person_dao
+            .discard_assigned_user(sales_person_id)
+            .await?;
+        if let Some(user) = user_id {
+            self.sales_person_dao
+                .assign_to_user(sales_person_id, user.as_ref(), SALES_PERSON_SERVICE_PROCESS)
+                .await?;
+            
+        }
+        Ok(())
+    }
 }