Designing reliable APIs - Idempotency-Key server implementation with Postgres, optimistic locking, safe retries with backoff and jitter, timeouts, webhook delivery with HMAC signing and replay protection, and AsyncAPI for event contracts.
Deep-dive architectural guide to ISO 20022 camt.054 notifications, MT900/MT910 migration, event-driven payment push architectures, Virtual IBAN (vIBAN) reconciliation, and outbox streaming pipelines.
Deep dive into Kubernetes Dynamic Admission Controllers — Mutating and Validating Webhooks, AdmissionReview JSONPatch RFC 6902, failurePolicy deadlock prevention, cert-manager TLS, and Policy-as-Code (Kyverno, OPA Gatekeeper).
A complete guide to managing async long-running operations — from the core async job pattern for beginners to task state machines, worker reliability, distributed scheduling, SSE/WebSocket progress, and production observability for senior engineers.
