diff --git a/app/domain/__init__.py b/app/domain/__init__.py
index b73080e7..908fbe13 100644
--- a/app/domain/__init__.py
+++ b/app/domain/__init__.py
@@ -1 +1,5 @@
 from domain.message import IrisMessage, IrisMessageRole
+from domain.course import Course
+from domain.exercise import ProgrammingExercise
+from domain.submission import ProgrammingSubmission
+from domain.codehint import CodeHint
diff --git a/app/domain/codehint.py b/app/domain/codehint.py
new file mode 100644
index 00000000..1819491c
--- /dev/null
+++ b/app/domain/codehint.py
@@ -0,0 +1,15 @@
+class ProgrammingExerciseSolutionEntry:
+    def __init__(self, file_path: str, previous_line: int, line: int, previous_code: str, code: str):
+        self.file_path = file_path
+        self.previous_line = previous_line
+        self.line = line
+        self.previous_code = previous_code
+        self.code = code
+
+
+class CodeHint:
+    def __init__(self, title: str, description: str, content: str, solution_entries: [ProgrammingExerciseSolutionEntry]):
+        self.title = title
+        self.description = description
+        self.content = content
+        self.solution_entries = solution_entries
diff --git a/app/domain/course.py b/app/domain/course.py
new file mode 100644
index 00000000..e5681bd3
--- /dev/null
+++ b/app/domain/course.py
@@ -0,0 +1,4 @@
+class Course:
+    def __init__(self, title, description):
+        self.title = title
+        self.description = description
diff --git a/app/domain/dtos.py b/app/domain/dtos.py
new file mode 100644
index 00000000..f1cbe778
--- /dev/null
+++ b/app/domain/dtos.py
@@ -0,0 +1,50 @@
+from domain import Course, ProgrammingExercise, IrisMessage, ProgrammingSubmission, CodeHint
+
+
+class ProgrammingExerciseTutorChatDTO:
+    def __init__(self,
+                 course: Course,
+                 exercise: ProgrammingExercise,
+                 submission: ProgrammingSubmission,
+                 chat_history: [IrisMessage]
+                 ):
+        self.course = course
+        self.exercise = exercise
+        self.submission = submission
+        self.chat_history = chat_history
+
+
+class CodeEditorChatDTO:
+    def __init__(self,
+                 problem_statement: str,
+                 solution_repository: dict[str, str],
+                 template_repository: dict[str, str],
+                 test_repository: dict[str, str],
+                 chat_history: [IrisMessage]
+                 ):
+        self.problem_statement = problem_statement
+        self.solution_repository = solution_repository
+        self.template_repository = template_repository
+        self.test_repository = test_repository
+        self.chat_history = chat_history
+
+
+class CodeEditorAdaptDTO:
+    def __init__(self,
+                 problem_statement: str,
+                 solution_repository: dict[str, str],
+                 template_repository: dict[str, str],
+                 test_repository: dict[str, str],
+                 instructions: str
+                 ):
+        self.problem_statement = problem_statement
+        self.solution_repository = solution_repository
+        self.template_repository = template_repository
+        self.test_repository = test_repository
+        self.chat_history = instructions
+
+
+class HestiaDTO:
+    def __init__(self, code_hint: CodeHint, exercise: ProgrammingExercise):
+        self.code_hint = code_hint
+        self.exercise = exercise
diff --git a/app/domain/exercise.py b/app/domain/exercise.py
new file mode 100644
index 00000000..b7ca9cab
--- /dev/null
+++ b/app/domain/exercise.py
@@ -0,0 +1,4 @@
+class ProgrammingExercise:
+    def __init__(self, title: str, problem_statement: str):
+        self.title = title
+        self.problem_statement = problem_statement
diff --git a/app/domain/submission.py b/app/domain/submission.py
new file mode 100644
index 00000000..12d45a2a
--- /dev/null
+++ b/app/domain/submission.py
@@ -0,0 +1,11 @@
+class BuildLogEntry:
+    def __init__(self, time: str, message: str):
+        self.time = time
+        self.message = message
+
+
+class ProgrammingSubmission:
+    def __init__(self, commit_hash: str, build_failed: bool, build_log_entries: [BuildLogEntry]):
+        self.commit_hash = commit_hash
+        self.build_failed = build_failed
+        self.build_log_entries = build_log_entries