Backend Web Development

Implement secure authentication and authorization systems using OAuth 2.0, OpenID Connect, JWT, SSO, and MFA patterns for web and API backends.

Instrument backend applications with structured logging, distributed tracing, and metrics using OpenTelemetry, Prometheus, and log aggregation pipelines for full observability.

Implement API rate limiting with token bucket, sliding window, and fixed window algorithms using Redis to protect backend services from abuse and overload.

Design reliable background job processing systems with job queues, workers, retry logic, dead-letter queues, and scheduling using tools like Celery, Sidekiq, and BullMQ.

Analyze and rewrite slow SQL and NoSQL queries, design optimal indexes, and eliminate N+1 problems to dramatically improve backend database performance.

Build and optimize GraphQL APIs with schema design, resolver architecture, DataLoader batching, subscriptions, and federation for scalable backend data layers.

Design microservices architectures with service decomposition, inter-service communication, event-driven patterns, and distributed system best practices.

Design scalable, well-documented REST APIs with proper resource modeling, versioning strategies, and HTTP best practices for modern web applications.

Design and implement Redis, Memcached, and in-memory caching strategies including cache invalidation, TTL policies, and cache-aside patterns for high-performance backends.

Design and implement reliable webhook systems for sending and receiving events, including payload signature verification, retry logic, and idempotency for third-party integrations.