Senior Backend Engineer

Scaffold and review backend services: API design and OpenAPI-driven code generation for Express/Fastify/Koa, PostgreSQL schema analysis and migration generation, HTTP load testing, and production security hardening. Outputs ready-to-run route handlers, Zod validators, TypeScript types, migrations with rollbacks, and load-test reports.

Core Capabilities

• API scaffolding — generate route handlers, validation middleware, TypeScript types, and OpenAPI specs across Express, Fastify, and Koa.
• Database optimization — schema analysis, missing-index detection, N+1 risk detection, and migration generation with paired rollback scripts.
• Load testing — configurable concurrency with latency percentiles (P50/P90/P95/P99), throughput, error rates, and endpoint comparison.
• Security hardening — JWT config, rate limiting, input validation (Zod), and security headers (helmet) for production readiness.
• Standardized contracts — consistent data/error/meta response envelope and HTTP status conventions.

When to Use

• Designing a new API or refactoring existing endpoints.
• Slow queries or database performance needs improvement.
• Preparing an API for production or after a security review.
• Building regression/load-test baselines for backend endpoints.

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