diff --git a/src/launchpad/api/update_api_models.py b/src/launchpad/api/update_api_models.py
index facc378f..205520c6 100644
--- a/src/launchpad/api/update_api_models.py
+++ b/src/launchpad/api/update_api_models.py
@@ -65,6 +65,9 @@ class UpdateData(BaseModel):
     app_id: str
     build_version: str
     build_number: Optional[int]
+    build_number_raw: Optional[str] = Field(
+        None, description="Unparsed build identifier (e.g. raw CFBundleVersion) for display purposes"
+    )
     artifact_type: int
     apple_app_info: Optional[AppleAppInfo] = None
     android_app_info: Optional[AndroidAppInfo] = None
diff --git a/src/launchpad/artifact_processor.py b/src/launchpad/artifact_processor.py
index aa301441..c54b726d 100644
--- a/src/launchpad/artifact_processor.py
+++ b/src/launchpad/artifact_processor.py
@@ -570,7 +570,7 @@ def _prepare_update_data(
         dequeued_at: datetime,
         app_icon_id: str | None,
     ) -> dict[str, Any]:
-        build_number = int(app_info.build) if app_info.build.isdigit() else None
+        build_number = _parse_build_number(app_info.build)
 
         apple_app_info = None
         if isinstance(app_info, AppleAppInfo):
@@ -602,6 +602,7 @@ def _prepare_update_data(
             app_id=app_info.app_id,
             build_version=app_info.version,
             build_number=build_number,
+            build_number_raw=app_info.build,
             artifact_type=_get_artifact_type(artifact).value,
             apple_app_info=apple_app_info,
             android_app_info=android_app_info,
@@ -662,3 +663,40 @@ def _guess_message(code: ProcessingErrorCode, e: Exception) -> ProcessingErrorMe
     elif code == ProcessingErrorCode.ARTIFACT_PROCESSING_TIMEOUT:
         return ProcessingErrorMessage.PROCESSING_TIMEOUT
     return ProcessingErrorMessage.UNKNOWN_ERROR
+
+
+# Zero-padding width per CFBundleVersion component when packing it into a single
+# sortable int. 6 digits comfortably covers any realistic CI build counter while
+# leaving the packed value well under BoundedBigIntegerField's max (bigint).
+_BUILD_NUMBER_COMPONENT_WIDTH = 6
+
+
+def _parse_build_number(build: str) -> int | None:
+    """Parse a raw build identifier (e.g. CFBundleVersion) into a sortable int.
+
+    Plain integer builds (the common case, e.g. Android versionCode) pass through
+    unchanged. Apple's CFBundleVersion also allows up to three dot-separated
+    non-negative integers (e.g. "1.2.3"); those are packed into a single int by
+    zero-padding each component, which preserves correct ordering as long as no
+    component reaches 10**_BUILD_NUMBER_COMPONENT_WIDTH. Anything else
+    (non-numeric, malformed) returns None, same as today.
+
+    Known limitation: plain-integer values are left small while packed dotted
+    values are much larger, so if the same app_id/build_version ever has builds
+    in both conventions, this int alone is not a reliable ordering between them.
+    We can't fix that here — a single artifact update has no visibility into
+    sibling artifacts' formats, and unifying the magnitude would break backward
+    compatibility with every already-stored plain-integer build_number. Sentry's
+    tiebreak query should treat this as a fast, common-case sort key and fall
+    back to comparing the raw build string (build_number_raw) directly when it
+    needs to be authoritative across mixed formats.
+    """
+    if build.isdigit():
+        return int(build)
+
+    parts = build.split(".")
+    if 2 <= len(parts) <= 3 and all(p.isdigit() and len(p) <= _BUILD_NUMBER_COMPONENT_WIDTH for p in parts):
+        parts += ["0"] * (3 - len(parts))
+        return sum(int(part) * 10 ** (_BUILD_NUMBER_COMPONENT_WIDTH * (2 - i)) for i, part in enumerate(parts))
+
+    return None
diff --git a/tests/unit/artifacts/test_artifact_processor.py b/tests/unit/artifacts/test_artifact_processor.py
index 4276d371..8e7aa42d 100644
--- a/tests/unit/artifacts/test_artifact_processor.py
+++ b/tests/unit/artifacts/test_artifact_processor.py
@@ -1,8 +1,12 @@
+from datetime import datetime
 from unittest.mock import Mock, patch
 
+import pytest
+
 from objectstore_client import Client as ObjectstoreClient
 
-from launchpad.artifact_processor import ArtifactProcessor, ServiceConfig
+from launchpad.artifact_processor import ArtifactProcessor, ServiceConfig, _parse_build_number
+from launchpad.artifacts.android.aab import AAB
 from launchpad.artifacts.apple.zipped_xcarchive import ZippedXCArchive
 from launchpad.artifacts.artifact import Artifact
 from launchpad.constants import (
@@ -11,6 +15,7 @@
     ProcessingErrorMessage,
 )
 from launchpad.sentry_client import SentryClient, SentryClientError
+from launchpad.size.models.android import AndroidAppInfo
 from launchpad.utils.objectstore import ObjectstoreConfig
 from launchpad.utils.statsd import FakeStatsd
 
@@ -398,3 +403,85 @@ def test_process_message_project_not_skipped(self, mock_process, mock_sentry_cli
             "increment",
             {"metric": "artifact.processing.completed", "value": 1, "tags": None},
         ) in calls
+
+
+class TestParseBuildNumber:
+    @pytest.mark.parametrize(
+        "build,expected",
+        [
+            # Plain integers (e.g. Android versionCode) pass through unchanged
+            ("9999", 9999),
+            ("0", 0),
+            ("1", 1),
+            # Apple CFBundleVersion: up to three dot-separated non-negative integers
+            ("1.2.3", 1_000_002_000_003),
+            ("1.2", 1_000_002_000_000),
+            # Malformed or unsupported shapes fall back to None, same as before
+            ("1.2.a", None),
+            ("abc", None),
+            ("1.2.3.4", None),
+            ("", None),
+            # A component too wide for the padding width is refused rather than
+            # silently corrupting the ordering of adjacent components
+            ("1234567.2.3", None),
+        ],
+    )
+    def test_parse_build_number(self, build, expected):
+        assert _parse_build_number(build) == expected
+
+    def test_dotted_builds_sort_correctly_within_a_version(self):
+        # Naive "strip the dots and parse as one number" concatenation would rank
+        # 1.99 ("199") above 2.0 ("20"), even though 1.99 is the earlier build.
+        assert _parse_build_number("1.99") < _parse_build_number("2.0")
+
+    def test_distinguishes_builds_that_naive_concatenation_would_collide(self):
+        # "1.2.3", "12.3", and "1.23" would all naively concatenate to "123".
+        assert _parse_build_number("1.2.3") != _parse_build_number("12.3")
+        assert _parse_build_number("1.2.3") != _parse_build_number("1.23")
+
+
+class TestPrepareUpdateData:
+    def setup_method(self):
+        """Set up test fixtures."""
+        mock_sentry_client = Mock(spec=SentryClient)
+        mock_statsd = Mock()
+        mock_objectstore_client = Mock(spec=ObjectstoreClient)
+        self.processor = ArtifactProcessor(mock_sentry_client, mock_statsd, mock_objectstore_client)
+
+    def test_dotted_build_number_is_parsed_and_raw_value_preserved(self):
+        app_info = AndroidAppInfo(
+            name="My App",
+            version="1.2.300",
+            build="1.2.3",
+            app_id="com.example.app",
+            has_proguard_mapping=False,
+        )
+
+        update_data = self.processor._prepare_update_data(
+            app_info=app_info,
+            artifact=Mock(spec=AAB),
+            dequeued_at=datetime(2026, 1, 1),
+            app_icon_id=None,
+        )
+
+        assert update_data["build_number"] == 1_000_002_000_003
+        assert update_data["build_number_raw"] == "1.2.3"
+
+    def test_plain_build_number_still_parses_as_int(self):
+        app_info = AndroidAppInfo(
+            name="My App",
+            version="1.2.300",
+            build="9999",
+            app_id="com.example.app",
+            has_proguard_mapping=False,
+        )
+
+        update_data = self.processor._prepare_update_data(
+            app_info=app_info,
+            artifact=Mock(spec=AAB),
+            dequeued_at=datetime(2026, 1, 1),
+            app_icon_id=None,
+        )
+
+        assert update_data["build_number"] == 9999
+        assert update_data["build_number_raw"] == "9999"