diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 35ba66e0..02400a35 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -10,6 +10,41 @@ permissions:
   contents: read
 
 jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+        with:
+          persist-credentials: false
+
+      - name: Set up Go
+        uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5.6.0
+        with:
+          go-version-file: go.mod
+          cache: true
+
+      - name: Verify vendor is up to date
+        run: |
+          go mod tidy
+          go mod vendor
+          git diff --exit-code -- go.mod go.sum vendor/
+
+      - name: Run golangci-lint
+        uses: golangci/golangci-lint-action@1e7e51e771db61008b38414a730f564565cf7c20 # v9
+        with:
+          version: v2.8
+          args: --timeout=5m ./...
+
+      - name: Run golangci-lint formatter checks
+        run: go run github.com/golangci/golangci-lint/v2/cmd/golangci-lint@v2.8.0 fmt --diff
+
+      - name: Run govulncheck
+        uses: golang/govulncheck-action@b625fbe08f3bccbe446d94fbf87fcc875a4f50ee # v1
+        with:
+          go-version-file: go.mod
+          go-package: ./...
+
   test:
     runs-on: ubuntu-latest
     steps:
@@ -68,7 +103,7 @@ jobs:
 
   publish-main:
     name: Publish GHCR :main
-    needs: [test, lint-actions]
+    needs: [test, lint, lint-actions]
     if: github.event_name == 'push' && github.ref == 'refs/heads/main'
     runs-on: ubuntu-latest
     permissions:
diff --git a/.golangci.yml b/.golangci.yml
new file mode 100644
index 00000000..2d57f7a8
--- /dev/null
+++ b/.golangci.yml
@@ -0,0 +1,25 @@
+version: "2"
+
+run:
+  timeout: 5m
+  modules-download-mode: vendor
+
+linters:
+  enable:
+    - bodyclose
+    - errorlint
+    - gosec
+    - misspell
+    - nilerr
+    - revive
+
+formatters:
+  enable:
+    - gofumpt
+  settings:
+    gofumpt:
+      extra-rules: true
+
+issues:
+  max-issues-per-linter: 0
+  max-same-issues: 0
diff --git a/Makefile b/Makefile
index 1f23ef13..ee75ce71 100644
--- a/Makefile
+++ b/Makefile
@@ -2,7 +2,7 @@ GOFLAGS ?= -mod=vendor
 VENDOR_STAMP := vendor/.modules.stamp
 MODULE_FILES := go.mod $(wildcard go.sum)
 
-.PHONY: vendor test build verify-vendor codegen
+.PHONY: vendor test build lint vuln verify-vendor codegen
 
 $(VENDOR_STAMP): $(MODULE_FILES)
 	go mod tidy
@@ -18,6 +18,15 @@ test: $(VENDOR_STAMP)
 build: $(VENDOR_STAMP)
 	GOFLAGS=$(GOFLAGS) go build ./...
 
+lint: $(VENDOR_STAMP)
+	@command -v golangci-lint >/dev/null || (echo "golangci-lint not found; use nix develop" && exit 1)
+	GOFLAGS=$(GOFLAGS) golangci-lint run ./...
+	GOFLAGS=$(GOFLAGS) golangci-lint fmt --diff
+
+vuln: $(VENDOR_STAMP)
+	@command -v govulncheck >/dev/null || (echo "govulncheck not found; use nix develop" && exit 1)
+	GOFLAGS=$(GOFLAGS) govulncheck ./...
+
 verify-vendor:
 	go mod tidy
 	go mod vendor
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 00000000..e5578c1f
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1770562336,
+        "narHash": "sha256-ub1gpAONMFsT/GU2hV6ZWJjur8rJ6kKxdm9IlCT0j84=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "d6c71932130818840fc8fe9509cf50be8c64634f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
index 15c0ca5d..d9367c6e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -25,6 +25,8 @@
               goreleaser
               actionlint
               zizmor
+              golangci-lint
+              govulncheck
             ];
           };
         }
diff --git a/go.mod b/go.mod
index 8cb51dd6..8986ddf6 100644
--- a/go.mod
+++ b/go.mod
@@ -1,6 +1,6 @@
 module github.com/coder/coder-k8s
 
-go 1.25.6
+go 1.25.7
 
 require (
 	k8s.io/apimachinery v0.35.0
diff --git a/internal/controller/codercontrolplane_controller.go b/internal/controller/codercontrolplane_controller.go
index 1f2a7bfc..84940642 100644
--- a/internal/controller/codercontrolplane_controller.go
+++ b/internal/controller/codercontrolplane_controller.go
@@ -1,3 +1,4 @@
+// Package controller contains Kubernetes controllers for coder-k8s resources.
 package controller
 
 import (
diff --git a/internal/deps/deps.go b/internal/deps/deps.go
index 37f614a6..e5cccdc5 100644
--- a/internal/deps/deps.go
+++ b/internal/deps/deps.go
@@ -5,8 +5,8 @@
 package deps
 
 import (
-	_ "k8s.io/apimachinery/pkg/runtime"
-	_ "k8s.io/client-go/kubernetes"
-	_ "k8s.io/code-generator"
-	_ "sigs.k8s.io/controller-runtime/pkg/client"
+	_ "k8s.io/apimachinery/pkg/runtime"           // Keep apimachinery runtime dependency vendored.
+	_ "k8s.io/client-go/kubernetes"               // Keep client-go kubernetes client vendored.
+	_ "k8s.io/code-generator"                     // Keep code-generator scripts vendored.
+	_ "sigs.k8s.io/controller-runtime/pkg/client" // Keep controller-runtime client vendored.
 )
diff --git a/main.go b/main.go
index ee5b0aa2..81cd158e 100644
--- a/main.go
+++ b/main.go
@@ -1,3 +1,4 @@
+// Package main provides the entrypoint for the coder-k8s binary.
 package main
 
 import (