01ClientReact · TypeScript
Role-aware interfaces and protected routes. The UI shows what you can do; it never decides what you are allowed to do.
02EdgeDNS · TLS · Nginx
The name resolves, TLS terminates, and a reverse proxy hands the request to the right upstream.
03MiddlewareExpress · JWT · RBAC
Validate every user-controlled input, verify the token, enforce the role. Authorization lives in the API.
04Service layerBusiness logic
Routes stay thin. Services hold the rules, so the logic is testable and independent of any client.
05CacheRedis
Hot reads come from cache and are invalidated on write — used where the read/write trade-off earns it, not everywhere.
06DataMongoDB · PostgreSQL · MySQL
Schemas modelled on real query patterns. Indexes where they matter, and no redundant round trips on hot endpoints.
07ShipDocker · GitHub Actions
One container image, built and released by CI, so the thing I tested is the thing that runs.
08ObserveLogs · Prometheus · Grafana
Metrics in place before go-live, so capacity and debugging decisions come from data instead of guesses.
One request, eight layers
01→ GET /api/jobs?status=open (recruiter dashboard)
02dns ✓ tls ✓ nginx → upstream api:4000
03validate ✓ jwt ✓ rbac: role=recruiter ✓
04jobs.service.listOpen({ recruiterId })
05redis GET jobs:open → MISS → fill
06db.jobs.find({ status: "open" }) ↳ index scan
07image api@sha-7f3c built and released by CI
08http_requests_total{route="/api/jobs"} += 1
← 200 OK application/json
