diff --git a/.gitattributes b/.gitattributes
index 27c560a..4380649 100644
--- a/.gitattributes
+++ b/.gitattributes
@@ -1,5 +1,6 @@
 .gitattributes text eol=lf
 *.sh text eol=lf
+.github/workflows/*.yml text eol=lf
 deploy/docker/frontend/*.sh text eol=lf
 frontend/src/*.js text eol=lf
 frontend/src/**/*.js text eol=lf
diff --git a/.github/workflows/_docker-build-push.yml b/.github/workflows/_docker-build-push.yml
new file mode 100644
index 0000000..29862b0
--- /dev/null
+++ b/.github/workflows/_docker-build-push.yml
@@ -0,0 +1,116 @@
+name: Docker build & push (reusable)
+
+# Reusable workflow that builds the three image targets defined in
+# deploy/docker/Dockerfile (backend, worker, frontend) and optionally pushes
+# them to both ghcr.io and Docker Hub under the 3252a8/ namespace.
+#
+# Called by:
+#   - docker-dev.yml      (tag_mode: dev,     push: true)  on pushes to dev
+#   - docker-release.yml  (tag_mode: release, push: true)  on pushes to main
+#   - ci.yml              (tag_mode: dev,     push: false) on pull requests
+
+on:
+  workflow_call:
+    inputs:
+      push:
+        description: "Push the built images to the registries"
+        type: boolean
+        default: true
+      tag_mode:
+        description: "Tagging strategy: 'dev' or 'release'"
+        type: string
+        required: true
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - target: backend
+            image: remnawave-minishop-backend
+          - target: worker
+            image: remnawave-minishop-worker
+          - target: frontend
+            image: remnawave-minishop-frontend
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          # Full history + tags: the Dockerfile's version-builder stage runs
+          # `git describe --tags` against the copied .git tree.
+          fetch-depth: 0
+
+      - name: Resolve release version
+        id: version
+        if: inputs.tag_mode == 'release'
+        run: |
+          # On a tag push github.ref_name is the tag (e.g. v3.4.5); for a
+          # manual workflow_dispatch on a branch, fall back to the latest tag.
+          if [ "${{ github.ref_type }}" = "tag" ]; then
+            raw="${{ github.ref_name }}"
+          else
+            raw="$(git describe --tags --abbrev=0 2>/dev/null)"
+          fi
+          version="${raw#v}"
+          if [ -z "$version" ]; then
+            echo "::error::No git tag found to derive the release version from"
+            exit 1
+          fi
+          echo "version=${version}" >> "$GITHUB_OUTPUT"
+          echo "Release version: ${version}"
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GitHub Container Registry
+        if: inputs.push
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Log in to Docker Hub
+        if: inputs.push
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            3252a8/${{ matrix.image }}
+            ghcr.io/3252a8/${{ matrix.image }}
+          tags: |
+            type=raw,value=dev,enable=${{ inputs.tag_mode == 'dev' }}
+            type=sha,prefix=dev-,format=short,enable=${{ inputs.tag_mode == 'dev' }}
+            type=raw,value=latest,enable=${{ inputs.tag_mode == 'release' }}
+            type=raw,value=${{ steps.version.outputs.version }},enable=${{ inputs.tag_mode == 'release' }}
+
+      - name: Build${{ inputs.push && ' & push' || '' }} ${{ matrix.image }}
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          file: deploy/docker/Dockerfile
+          target: ${{ matrix.target }}
+          platforms: linux/amd64
+          push: ${{ inputs.push }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          # The Dockerfile's version-builder appends a "-<branch>" suffix to the
+          # internal version string for non-main builds. Force "main" on release
+          # (the ref is the tag, not a branch) so release images stay un-suffixed.
+          build-args: |
+            GITHUB_REF_NAME=${{ inputs.tag_mode == 'release' && 'main' || github.ref_name }}
+          cache-from: type=gha,scope=${{ matrix.target }}
+          cache-to: type=gha,mode=max,scope=${{ matrix.target }}
+          provenance: false
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..027a381
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,64 @@
+name: PR checks
+
+# Runs on pull requests into main (typically from dev) and into dev (typically
+# from feature/* branches): lint + format checks and a no-push image build to
+# prove the Docker images still build.
+
+on:
+  pull_request:
+    branches: [main, dev]
+
+concurrency:
+  group: ci-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  lint:
+    name: Lint & format
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install ruff
+        run: pip install "ruff>=0.8.0"
+
+      - name: Ruff lint (Python)
+        run: ruff check .
+
+      - name: Ruff format check (Python)
+        run: ruff format --check .
+
+      - name: Set up Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+          cache: npm
+          cache-dependency-path: frontend/package-lock.json
+
+      - name: Install frontend deps
+        run: npm ci
+        working-directory: frontend
+
+      - name: ESLint (frontend)
+        run: npm run lint
+        working-directory: frontend
+
+      - name: Prettier check (frontend)
+        run: npm run format:check
+        working-directory: frontend
+
+  build:
+    name: Docker build
+    uses: ./.github/workflows/_docker-build-push.yml
+    with:
+      push: false
+      tag_mode: dev
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
new file mode 100644
index 0000000..97457a0
--- /dev/null
+++ b/.github/workflows/codeql.yml
@@ -0,0 +1,48 @@
+name: CodeQL
+
+# Static analysis of the Python and JS/TS code for security and quality issues.
+# Results appear under the repository's Security -> Code scanning tab.
+
+on:
+  push:
+    branches: [main, dev]
+  pull_request:
+    branches: [main, dev]
+  schedule:
+    - cron: "27 3 * * 1" # weekly, Monday 03:27 UTC
+
+concurrency:
+  group: codeql-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  analyze:
+    name: Analyze (${{ matrix.language }})
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write
+      actions: read
+      contents: read
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - language: python
+          - language: javascript-typescript
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@v3
+        with:
+          languages: ${{ matrix.language }}
+          build-mode: none
+
+      - name: Perform CodeQL analysis
+        uses: github/codeql-action/analyze@v3
+        with:
+          category: "/language:${{ matrix.language }}"
diff --git a/.github/workflows/dependency-review.yml b/.github/workflows/dependency-review.yml
new file mode 100644
index 0000000..41c850d
--- /dev/null
+++ b/.github/workflows/dependency-review.yml
@@ -0,0 +1,27 @@
+name: Dependency review
+
+# On PRs into main/dev, flag any newly added dependency that has a known
+# vulnerability or an incompatible license before it gets merged.
+
+on:
+  pull_request:
+    branches: [main, dev]
+
+permissions:
+  contents: read
+
+jobs:
+  dependency-review:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Dependency review
+        uses: actions/dependency-review-action@v4
+        with:
+          fail-on-severity: high
+          comment-summary-in-pr: on-failure
diff --git a/.github/workflows/docker-dev.yml b/.github/workflows/docker-dev.yml
new file mode 100644
index 0000000..93d3f88
--- /dev/null
+++ b/.github/workflows/docker-dev.yml
@@ -0,0 +1,25 @@
+name: Dev images
+
+# On every push to the dev branch, build all three images and push them to
+# ghcr.io and Docker Hub tagged `dev` and `dev-<short-sha>`.
+
+on:
+  push:
+    branches: [dev]
+  workflow_dispatch:
+
+concurrency:
+  group: docker-dev-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  build-push:
+    uses: ./.github/workflows/_docker-build-push.yml
+    with:
+      push: true
+      tag_mode: dev
+    secrets: inherit
diff --git a/.github/workflows/docker-release.yml b/.github/workflows/docker-release.yml
new file mode 100644
index 0000000..56bfbab
--- /dev/null
+++ b/.github/workflows/docker-release.yml
@@ -0,0 +1,28 @@
+name: Release images
+
+# Build all three images and push them to ghcr.io and Docker Hub tagged
+# `latest` and the release version (the pushed tag with its leading `v`
+# stripped, e.g. v3.4.5 -> 3.4.5). Triggered only when a new v* tag is pushed,
+# so images are built once per release rather than on every commit to main.
+
+on:
+  push:
+    tags:
+      - "v*"
+  workflow_dispatch:
+
+concurrency:
+  group: docker-release-${{ github.ref }}
+  cancel-in-progress: false
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  build-push:
+    uses: ./.github/workflows/_docker-build-push.yml
+    with:
+      push: true
+      tag_mode: release
+    secrets: inherit
diff --git a/.github/workflows/security.yml b/.github/workflows/security.yml
new file mode 100644
index 0000000..80f74eb
--- /dev/null
+++ b/.github/workflows/security.yml
@@ -0,0 +1,89 @@
+name: Security
+
+# Audits the full dependency set (pip-audit, npm audit) and runs a Trivy
+# filesystem scan (dependencies + Dockerfile/IaC misconfig). Trivy results are
+# uploaded to the Security -> Code scanning tab.
+
+on:
+  pull_request:
+    branches: [main, dev]
+  push:
+    branches: [main, dev]
+  schedule:
+    - cron: "27 4 * * 1" # weekly, Monday 04:27 UTC
+  workflow_dispatch:
+
+concurrency:
+  group: security-${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  python-audit:
+    name: pip-audit
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install pip-audit
+        run: pip install pip-audit
+
+      - name: Audit Python dependencies
+        run: pip-audit -r backend/requirements.txt
+
+  npm-audit:
+    name: npm audit
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: "22"
+          cache: npm
+          cache-dependency-path: frontend/package-lock.json
+
+      - name: Install frontend deps
+        run: npm ci
+        working-directory: frontend
+
+      - name: Audit npm dependencies
+        run: npm audit --audit-level=high
+        working-directory: frontend
+
+  trivy:
+    name: Trivy filesystem scan
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      security-events: write
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Run Trivy
+        uses: aquasecurity/trivy-action@0.28.0
+        with:
+          scan-type: fs
+          scan-ref: .
+          format: sarif
+          output: trivy-results.sarif
+          severity: CRITICAL,HIGH
+          ignore-unfixed: true
+
+      - name: Upload Trivy results
+        uses: github/codeql-action/upload-sarif@v3
+        if: always()
+        with:
+          sarif_file: trivy-results.sarif
+          category: trivy-fs