I architect and build mission-critical, high-concurrency financial infrastructures and payment orchestration engines for global payment service providers (PSPs) like Stripe Connect. My core engineering focus revolves around:
- Deterministic Inventory Reservation: Enforcing strict Pessimistic Locking (
SELECT ... FOR UPDATE) in PostgreSQL to prevent race conditions during flash-sale checkouts. - Idempotent Payment Pipelines: Guaranteeing at-least-once safety and preventing double-charging through cryptographic request hashing and Redis/TTL idempotency caching layers.
- Immutable Double-Entry Bookkeeping: Maintaining zero-sum financial balance invariants via cryptographically verifiable ledger postings and automated audit trails.
- Infrastructure Resilience & Observability: Validating system durability via Chaos Engineering (Chaos Mesh network latency injection) and end-to-end OpenTelemetry distributed tracing.
graph TD
Client["Client / Merchant API"] -->|HMAC-SHA256 Signed| Gateway["Node.js Enterprise API Gateway"]
Gateway --> Idempotency["Idempotency & TTL Cache Engine"]
Idempotency -->|Cache Hit| CachedResponse["Return Cached Payload"]
Idempotency -->|New Request| DB["PostgreSQL (Pessimistic Row Locking)"]
DB --> PSP["Stripe Connect / Multi-PSP Orchestration"]
PSP --> Ledger["Immutable Double-Entry Ledger Engine"]
Ledger --> Telemetry["OpenTelemetry & Chaos-tested Resilience"]