diff --git a/Makefile b/Makefile
index e6a549ba6..a45d166cb 100644
--- a/Makefile
+++ b/Makefile
@@ -5,6 +5,9 @@ SHELL := /bin/bash
 server:
 	@python manage.py runserver 0.0.0.0:8001
 
+worker:
+	@python -m celery -A core.worker worker -B -l INFO
+
 fmt:
 	@pre-commit run --all-files
 
diff --git a/conventions/services/avenants.py b/conventions/services/avenants.py
index 2eefe7037..5bb8e1065 100644
--- a/conventions/services/avenants.py
+++ b/conventions/services/avenants.py
@@ -13,6 +13,8 @@
 from conventions.services.search import AvenantListSearchService
 from upload.services import UploadService
 
+from .utils import convention_upload_filename
+
 logger = logging.getLogger(__name__)
 
 
@@ -141,14 +143,16 @@ def complete_avenants_for_avenant(
         if avenant_form.is_valid():
             file = request.FILES["nom_fichier_signe"]
             if file:
-                now = datetime.datetime.now().strftime("%Y-%m-%d_%H-%M")
-                filename = f"{now}_convention_{avenant.uuid}_signed.pdf"
+                upload_filename = convention_upload_filename(avenant)
+
                 upload_service = UploadService(
                     convention_dirpath=f"conventions/{avenant.uuid}/convention_docs",
-                    filename=filename,
+                    filename=upload_filename,
                 )
+
                 upload_service.upload_file(file)
-                avenant.nom_fichier_signe = filename
+                avenant.nom_fichier_signe = upload_filename
+
             for avenant_type in avenant_form.cleaned_data["avenant_types"]:
                 avenanttype = AvenantType.objects.get(nom=avenant_type)
                 avenant.avenant_types.add(avenanttype)
diff --git a/conventions/services/file.py b/conventions/services/file.py
index ff572c10e..54ec1bd8c 100644
--- a/conventions/services/file.py
+++ b/conventions/services/file.py
@@ -8,6 +8,8 @@
 from core.storage import client
 from upload.services import UploadService
 
+from .utils import convention_upload_filename
+
 logger = logging.getLogger(__name__)
 
 
@@ -16,11 +18,11 @@ class ConventionFileService:
     def upload_convention_file(
         cls, convention: Convention, file: File, update_statut: bool = True
     ):
-        now = datetime.datetime.now().strftime("%Y-%m-%d_%H-%M")
-        filename = f"{now}_convention_{convention.uuid}_signed.pdf"
+        upload_filename = convention_upload_filename(convention)
+
         upload_service = UploadService(
             convention_dirpath=f"conventions/{convention.uuid}/convention_docs",
-            filename=filename,
+            filename=upload_filename,
         )
         upload_service.upload_file(file)
 
@@ -28,7 +30,7 @@ def upload_convention_file(
             convention.statut = ConventionStatut.SIGNEE.label
             convention.televersement_convention_signee_le = datetime.date.today()
 
-        convention.nom_fichier_signe = filename
+        convention.nom_fichier_signe = upload_filename
         convention.save()
 
     @classmethod
diff --git a/conventions/services/utils.py b/conventions/services/utils.py
index 55579ff68..f64708256 100644
--- a/conventions/services/utils.py
+++ b/conventions/services/utils.py
@@ -1,4 +1,5 @@
 import json
+from datetime import datetime
 from enum import Enum
 
 from django.http import HttpRequest
@@ -147,3 +148,29 @@ def set_from_form_or_object(field, form, obj):
             else getattr(obj, field)
         ),
     )
+
+
+def convention_upload_filename(convention: Convention) -> str:
+
+    def _normalize(numero: str | None) -> str | None:
+        if numero:
+            return numero.replace(" ", "_")
+
+    parts = []
+
+    if convention.parent:
+        parts += [
+            f"convention_{_normalize(convention.parent.numero)}",
+            f"avenant_{_normalize(convention.numero) or 'N'}",
+        ]
+    else:
+        parts += [
+            f"convention_{_normalize(convention.numero) or 'NUM'}",
+        ]
+
+    if convention.statut == ConventionStatut.PROJET.label:
+        parts.append("projet")
+
+    parts.append(datetime.now().strftime("%Y-%m-%d_%H-%M"))
+
+    return f"{'_'.join(parts)}.pdf"
diff --git a/conventions/tests/services/test_utils.py b/conventions/tests/services/test_utils.py
new file mode 100644
index 000000000..f34005918
--- /dev/null
+++ b/conventions/tests/services/test_utils.py
@@ -0,0 +1,70 @@
+import time_machine
+from django.test import SimpleTestCase
+from unittest_parametrize import ParametrizedTestCase, parametrize
+
+from conventions.models import ConventionStatut
+from conventions.services.utils import convention_upload_filename
+from conventions.tests.factories import ConventionFactory
+
+
+class UtilsTest(ParametrizedTestCase, SimpleTestCase):
+
+    @parametrize(
+        "conv_data, expected_result",
+        [
+            (
+                {
+                    "numero": "123/456/789",
+                },
+                "convention_123/456/789_projet_2024-06-21_00-00.pdf",
+            ),
+            (
+                {
+                    "numero": None,
+                },
+                "convention_NUM_projet_2024-06-21_00-00.pdf",
+            ),
+            (
+                {
+                    "numero": "",
+                },
+                "convention_NUM_projet_2024-06-21_00-00.pdf",
+            ),
+            (
+                {
+                    "numero": "123 456 789",
+                    "statut": ConventionStatut.INSTRUCTION.label,
+                },
+                "convention_123_456_789_2024-06-21_00-00.pdf",
+            ),
+            (
+                {
+                    "numero": "1",
+                    "parent": ConventionFactory.build(numero="123/456/789"),
+                },
+                "convention_123/456/789_avenant_1_projet_2024-06-21_00-00.pdf",
+            ),
+            (
+                {
+                    "numero": None,
+                    "parent": ConventionFactory.build(numero="123/456/789"),
+                },
+                "convention_123/456/789_avenant_N_projet_2024-06-21_00-00.pdf",
+            ),
+            (
+                {
+                    "numero": "",
+                    "parent": ConventionFactory.build(numero="123/456/789"),
+                },
+                "convention_123/456/789_avenant_N_projet_2024-06-21_00-00.pdf",
+            ),
+        ],
+    )
+    def test_convention_upload_filename(self, conv_data, expected_result):
+        with time_machine.travel("2024-06-21"):
+            assert (
+                convention_upload_filename(
+                    convention=ConventionFactory.build(**conv_data)
+                )
+                == expected_result
+            )
diff --git a/requirements.txt b/requirements.txt
index 69bd29aed..af6d41ccc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -127,9 +127,9 @@ django-sql-explorer[xls]==4.3 \
     --hash=sha256:9c0735b08270ac60276ea2697a499cb9457acf00f0d0016a230c092ab3b4d310 \
     --hash=sha256:c853bc0a270b290646d4ca731769f1e223a151e5724aee69e3b3967f0cf7b96f
     # via -r requirements.in
-django-storages==1.14.4 \
-    --hash=sha256:69aca94d26e6714d14ad63f33d13619e697508ee33ede184e462ed766dc2a73f \
-    --hash=sha256:d61930acb4a25e3aebebc6addaf946a3b1df31c803a6bf1af2f31c9047febaa3
+django-storages==1.14.3 \
+    --hash=sha256:31f263389e95ce3a1b902fb5f739a7ed32895f7d8b80179fe7453ecc0dfe102e \
+    --hash=sha256:95a12836cd998d4c7a4512347322331c662d9114c4344f932f5e9c0fce000608
     # via -r requirements.in
 django-waffle==4.1.0 \
     --hash=sha256:5979a2f3dd674ef7086480525b39651fc2045427f6d8e6a614192656d3402c5b \