Senior Backend Engineer 路 Distributed Systems & Platform Infrastructure 路 Python 路 AWS
I build the shared infrastructure that 200+ production APIs run on. I work at Perfios, where I scale and maintain the core APIs of TotalKYC, an identity-verification platform.
- Cost: cut third-party vendor dependency by 55% by rebuilding the routing and caching layer, for $700K+ in cumulative savings since Apr 2024.
- Reliability: own active-passive disaster recovery across Mumbai and Hyderabad, supporting 5M+ daily requests at 99.9%+ availability.
- Platform: built shared-utilities (secrets access, schema validation, request configuration) and rolled it out across 200+ production APIs. Changes that once required redeploying every API now ship as one package update.
- Routing: built proxy-service for 120+ APIs with health-aware selection and automatic cooldown recovery. It recovers 21% of requests that would otherwise fail.
- Coordination: built a Redis-backed session library with distributed locks across concurrent Lambda workloads, cutting session-related failures by 35%.
- Languages & backend: Python, FastAPI, Pydantic, Celery, JavaScript, Node.js, SQL
- Data & messaging: Redis, MongoDB, Kafka, RabbitMQ, Amazon SQS
- Cloud & delivery: AWS Lambda, ECS/Fargate, EC2, S3, EventBridge, CloudFormation, Docker, GitLab CI/CD
A per-organization, per-feature quota service. A single Redis Lua script handles validation, idempotency, deduction, and denial recording atomically, with all-or-nothing batches, idempotent refunds, and cron-free monthly resets. It was validated with 10,000 simulated requests and zero over-serving.