Here’s a practical, opinionated stack for platform engineering + internal developer experience (IDP) that works well for a modern Kubernetes-based org without becoming too “tool-heavy.”

1) Core platform foundation

Goal: make infrastructure repeatable, secure, and self-service.

• Cloud: AWS / GCP / Azure
• IaC: Terraform or OpenTofu
• GitOps: Argo CD or Flux
• Kubernetes: managed K8s (EKS/GKE/AKS)
• Secrets: External Secrets Operator + cloud secret manager
• Policy: OPA Gatekeeper or Kyverno
• Networking / ingress: NGINX Ingress or Traefik; service mesh only if truly needed

2) Internal developer platform layer

Goal: give developers a paved road and self-service workflows.

• IDP portal: Backstage
• Golden path templates: Backstage Scaffolder templates
• Self-service actions: deploy service, create repo, provision DB, request namespace, rotate secrets
• Service catalog: Backstage software catalog as source of truth
• Environment management: namespaces per team/app, ephemeral preview environments if you can support them

3) CI/CD

Goal: automate build, test, release, and deploy.

• CI: GitHub Actions or GitLab CI
• Artifact registry: ECR/GAR/ACR + container registry
• Image security: Trivy or Grype
• Release strategy: GitOps-based deploys, optionally progressive delivery
• Progressive delivery: Argo Rollouts or Flagger if you need canary/blue-green

4) Observability

Goal: make the platform debuggable and trustworthy.

• Metrics: Prometheus
• Dashboards: Grafana
• Logging: Loki or OpenSearch/ELK
• Tracing: OpenTelemetry + Jaeger/Tempo
• Alerting: Alertmanager + PagerDuty/Opsgenie
• SLOs: define SLIs/SLOs for key platform and service paths

5) Security and supply chain

Goal: secure-by-default developer workflows.

• Container/image scanning: Trivy
• Dependency scanning: Dependabot, Renovate, Snyk if budget allows
• SBOM: Syft + Grype or native CI support
• Signing: Cosign
• Admission control: Kyverno/Gatekeeper policies
• Identity: SSO via Okta/Azure AD/Google Workspace
• Access: RBAC, least privilege, short-lived credentials

6) Developer experience essentials

Goal: reduce friction and cognitive load.

• Repo management: mono-repo or poly-repo based on org shape, but standardize templates
• Local dev: Docker Compose + Tilt or Skaffold for Kubernetes-heavy workflows
• Docs: MkDocs or Docusaurus
• API management: OpenAPI/AsyncAPI, contract testing
• Feature flags: LaunchDarkly or open-source alternative if needed
• Package management: npm/pip/go modules/etc. standardized per language

7) Platform operating model

Goal: make the platform actually usable.

• Define paved roads, not endless options
• Provide:
  • one-click service creation
  • standard CI pipeline templates
  • standard deployment patterns
  • standard observability sidecars/config
  • standard secrets handling
• Track platform product metrics:
  • time to first deploy
  • lead time for changes
  • deployment frequency
  • change failure rate
  • developer satisfaction

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A concrete “good default” stack

If you want a single pragmatic recommendation:

• Terraform/OpenTofu
• Kubernetes on a managed cloud
• Argo CD
• Backstage
• GitHub Actions
• Prometheus + Grafana + Loki + OpenTelemetry
• Kyverno
• External Secrets Operator
• Trivy + Cosign + Renovate
• Argo Rollouts if you need safer deployments

This is a strong, realistic stack that balances:

• developer self-service
• security
• operational simplicity
• good ecosystem support

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What I’d avoid early

• service mesh too soon
• too many bespoke internal tools
• multiple CI/CD systems
• homegrown portal instead of Backstage
• overengineering multi-cluster setups before you need them

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Best first steps

If you’re starting from scratch, implement in this order:

1. Standardize infra with Terraform/OpenTofu
2. Set up GitOps with Argo CD
3. Create one golden path service template
4. Add Backstage catalog + scaffolding
5. Add observability baseline
6. Add policy + secrets + scanning
7. Expand to preview envs and progressive delivery

If you want, I can turn this into:

• a reference architecture diagram
• a buy vs build comparison
• a stack by company size (startup / scale-up / enterprise)
• or a 30/60/90-day implementation plan