Mayankkuhaad

Built a multi-tenant workflow orchestration engine for document verification lifecycles across dynamic geo-zones using a finite state machine (FSM) with strict transition guards and pessimistic data locking. Implemented idempotent bulk ingestion and SLA escalation to validate and upsert 15,000+ hierarchical records, with cron-driven routing and tiered escalation for stalled requests. Executed zero-downtime database migrations for 20,000+ legacy records using transactional safety predicates and integrated dual stateless JWT authentication with Redis-cached policy guards for sub-millisecond re-route authorization.

Led backend engineering for production eCommerce platforms handling 50,000+ orders. Engineered modular RESTful services using Node.js, Express, MySQL, and Sequelize deployed via Docker containers. Integrated Stripe payment infrastructure with webhook signature verification and idempotent processing for partial payments, network drops, and refund loops. Designed multi-tier Redis caching to cut database query volume by 60%+ while maintaining sub-100ms responses during traffic surges; established CI/CD pipelines on GitHub Actions with automated testing.

Led back-end engineering for an eCommerce platform serving 50,000+ orders, building modular RESTful services using Node.js, Express, MySQL, and Sequelize in Docker containers. Implemented Stripe payment reconciliation with webhook signature verification and idempotent processing to handle distributed edge cases such as partial payments, network drops, and refund loops. Designed multi-tier Redis caching for high-frequency catalog queries, reducing database query volume by 60%+ and maintaining sub-100ms response times during traffic spikes. Established GitHub Actions CI/CD with automated testing to support reliable production deployments.