Senior Backend Engineer focused on production API systems, source orchestration, Redis-backed reliability guardrails, AWS/Fargate worker pipelines, and cost-aware backend architecture.

• Languages: Python (FastAPI), Node.js, TypeScript
• Infrastructure: AWS (Fargate, ECS, SQS), Docker, Linux
• Databases & Messaging: Redis, Kafka, Celery, MongoDB, RabbitMQ

• Scale: Operate backend systems handling 5M+ daily API requests across critical identity and KYC flows.
• Latency: Reduced P99 latency by ~70% across multiple APIs by reworking high-volume response paths and worker execution.
• Ownership: Designed 30 APIs from scratch and maintained/operated 200+ APIs across TotalKYC, Data Science, and VideoKYC integrations.
• Cost: Contributed to $700K+ annualized savings through in-house serving improvements, source orchestration, and vendor dependency reduction.
• Reliability: Owned DR testing, deployment, monitoring, incident handling, and CI/CD setup for regional API paths.

A backend service for enforcing monthly API usage limits in multi-tenant products without losing accuracy under concurrent traffic.

• Race Conditions: Keeps token deduction and idempotency validation atomic with Redis Lua scripts.
• Failures & Retries: Uses a deduct-then-refund flow so quota state can recover when upstream requests fail mid-flight.

A developer discovery tool for filtering public repository/profile data by language stack and activity, useful for faster engineering research and candidate discovery.

A focused React and Tailwind portfolio built to communicate backend impact, production metrics, project history, and direct hiring/freelance contact paths.

• Profiles: LinkedIn | Portfolio | Technical Blog
• Email: arihantjain416@gmail.com