diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 0000000..4ca73a2
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,6 @@
+**/bin
+**/obj
+**/node_modules
+.git
+.github
+deploy
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..da6110a
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,91 @@
+name: ci
+
+# Pull requests: build, test and build the image without pushing.
+# Push to master (direct or merged PR) or a manual run on master: release.
+#   GitVersion picks the next version (patch by default, "+semver: minor|major" in a commit message for more),
+#   the image is pushed as <version> and latest, and the git tag v<version> is pushed so the next release counts from it.
+#   Argo CD Image Updater (infrastructure repo) deploys the newest <version>; nothing is committed back.
+on:
+  push:
+    branches: [master]
+    paths-ignore: [deploy/**, '**.md']
+  pull_request:
+    branches: [master]
+  workflow_dispatch:
+
+# Releases run one at a time, so each one computes its version after the previous one pushed its tag.
+concurrency:
+  group: ${{ github.event_name == 'pull_request' && format('pr-{0}', github.event.number) || 'release' }}
+  cancel-in-progress: ${{ github.event_name == 'pull_request' }}
+
+env:
+  IMAGE: ghcr.io/greboh/hearth-api
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        # global.json (SDK pin, Microsoft Testing Platform runner) lives in src/
+        working-directory: src
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: 10.0.x
+      - run: dotnet build Hearth.slnx -c Release
+      - name: Run tests
+        run: |
+          mapfile -t projects < <(git ls-files '*Tests.csproj')
+          if [ ${#projects[@]} -eq 0 ]; then
+            echo "No test projects found"
+            exit 0
+          fi
+          for project in "${projects[@]}"; do
+            dotnet test "$project" -c Release
+          done
+
+  image:
+    needs: build
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      packages: write
+    env:
+      RELEASE: ${{ github.event_name != 'pull_request' && github.ref == 'refs/heads/master' }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - uses: gittools/actions/gitversion/setup@v4
+        with:
+          versionSpec: 6.x
+      - id: gitversion
+        uses: gittools/actions/gitversion/execute@v4
+      - uses: docker/setup-buildx-action@v3
+      - uses: docker/login-action@v3
+        if: env.RELEASE == 'true'
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: ${{ env.RELEASE == 'true' }}
+          tags: |
+            ${{ env.IMAGE }}:${{ steps.gitversion.outputs.majorMinorPatch }}
+            ${{ env.IMAGE }}:latest
+          cache-from: type=gha,scope=api
+          cache-to: type=gha,mode=max,scope=api
+      - name: Push release tag
+        if: env.RELEASE == 'true'
+        env:
+          TAG: v${{ steps.gitversion.outputs.majorMinorPatch }}
+        run: |
+          if git ls-remote --exit-code --tags origin "refs/tags/$TAG" >/dev/null; then
+            echo "$TAG already exists"
+            exit 0
+          fi
+          git tag "$TAG" "$GITHUB_SHA"
+          git push origin "$TAG"
diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..b8c9907
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,11 @@
+FROM mcr.microsoft.com/dotnet/sdk:10.0 AS build
+WORKDIR /src
+COPY src/ .
+RUN dotnet restore Hosts/Hearth.Api/Hearth.Api.csproj
+RUN dotnet publish Hosts/Hearth.Api/Hearth.Api.csproj -c Release --no-restore -o /app
+
+FROM mcr.microsoft.com/dotnet/aspnet:10.0
+WORKDIR /app
+COPY --from=build /app .
+USER app
+ENTRYPOINT ["dotnet", "Hearth.Api.dll"]
diff --git a/GitVersion.yaml b/GitVersion.yaml
new file mode 100644
index 0000000..dc94b89
--- /dev/null
+++ b/GitVersion.yaml
@@ -0,0 +1,6 @@
+mode: ContinuousDeployment
+branches:
+  main:
+    regex: ^master$
+    label: ci
+    increment: Patch
diff --git a/deploy/api/deployment.yaml b/deploy/api/deployment.yaml
new file mode 100644
index 0000000..323e8c4
--- /dev/null
+++ b/deploy/api/deployment.yaml
@@ -0,0 +1,41 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: hearth-api
+  labels:
+    app: hearth-api
+spec:
+  # One replica with Recreate: schema upgrades and scheduled syncs must run in one process at a time.
+  # Do not scale or switch to RollingUpdate before the worker split (Obsidian: Topics/Architecture, Singleton work).
+  replicas: 1
+  strategy:
+    type: Recreate
+  selector:
+    matchLabels:
+      app: hearth-api
+  template:
+    metadata:
+      labels:
+        app: hearth-api
+    spec:
+      containers:
+        - name: api
+          image: ghcr.io/greboh/hearth-api
+          imagePullPolicy: IfNotPresent
+          ports:
+            - name: http
+              containerPort: 8080
+          readinessProbe:
+            httpGet:
+              path: /health
+              port: http
+          livenessProbe:
+            httpGet:
+              path: /alive
+              port: http
+          resources:
+            requests:
+              cpu: 50m
+              memory: 128Mi
+            limits:
+              memory: 256Mi
diff --git a/deploy/api/ingress.yaml b/deploy/api/ingress.yaml
new file mode 100644
index 0000000..f89ab50
--- /dev/null
+++ b/deploy/api/ingress.yaml
@@ -0,0 +1,25 @@
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: hearth-api
+  annotations:
+    traefik.ingress.kubernetes.io/router.middlewares: services-hearth-api-strip@kubernetescrd
+    # Owns the certificate until the web ingress exists; the web ingress then reuses hearth-greboh-dev-tls.
+    cert-manager.io/cluster-issuer: letsencrypt-prod
+spec:
+  ingressClassName: traefik
+  tls:
+    - hosts:
+        - hearth.greboh.dev
+      secretName: hearth-greboh-dev-tls
+  rules:
+    - host: hearth.greboh.dev
+      http:
+        paths:
+          - path: /api
+            pathType: Prefix
+            backend:
+              service:
+                name: hearth-api
+                port:
+                  name: http
diff --git a/deploy/api/kustomization.yaml b/deploy/api/kustomization.yaml
new file mode 100644
index 0000000..20d597e
--- /dev/null
+++ b/deploy/api/kustomization.yaml
@@ -0,0 +1,9 @@
+apiVersion: kustomize.config.k8s.io/v1beta1
+kind: Kustomization
+namespace: services
+# No image tag here: Argo CD Image Updater (infrastructure repo) sets the newest released version on the Application.
+resources:
+  - deployment.yaml
+  - service.yaml
+  - middleware.yaml
+  - ingress.yaml
diff --git a/deploy/api/middleware.yaml b/deploy/api/middleware.yaml
new file mode 100644
index 0000000..8bf4957
--- /dev/null
+++ b/deploy/api/middleware.yaml
@@ -0,0 +1,8 @@
+apiVersion: traefik.io/v1alpha1
+kind: Middleware
+metadata:
+  name: hearth-api-strip
+spec:
+  stripPrefix:
+    prefixes:
+      - /api
diff --git a/deploy/api/service.yaml b/deploy/api/service.yaml
new file mode 100644
index 0000000..c449931
--- /dev/null
+++ b/deploy/api/service.yaml
@@ -0,0 +1,11 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: hearth-api
+spec:
+  selector:
+    app: hearth-api
+  ports:
+    - name: http
+      port: 80
+      targetPort: http