Kuldeep Sen

Backend Engineer with 4+ years of experience building scalable and high-availability systems using Node.js, Express.js, TypeScript, and AWS. Experienced in designing microservices and REST/GraphQL APIs, with expertise in Redis caching, event-driven architecture, and Stripe payment integration. Strong background in authentication (JWT/OAuth 2.0), database optimization (MongoDB, MySQL, PostgreSQL), and DevOps (Docker, CI/CD, Kafka, Redis). Led a team of 7 engineers to deliver scalable application.

Node.js Developer at Parkhya Solutions Pvt. Ltd. (2023-11 – 2026-02)

• Led and mentored 5 developers, providing technical training and guiding them through multiple project implementations while ensuring code quality and best development practices.
• Architected a horizontally scalable microservices platform on AWS (EC2, ECS, ALB) with autoscaling groups and Circuit Breaker patterns.
• Designed and implemented an event-driven notification pipeline using AWS SQS + Lambda, decoupling 4 domain services (payments, inventory, email, push) — reducing average order fulfillment latency.

Associate Node.js Developer at Infinity Genesis Techso Pvt. Ltd. (2022-11 – 2023-10)

• Developed and maintained REST APIs for a high-traffic platform, optimising slow queries and integrating Redis caching to improve response times — received 'Top Performer' award for backend reliability contributions.
• Integrated Stripe payment gateway for one-time transactions and recurring subscriptions, handling webhook events and implementing basic retry logic to improve payment reliability.
• Contributed to engineering best practices within the backend team by participating in code reviews, writing unit tests, and following agreed branching and deployment workflows.

Web Developer at PIECODES Pvt. Ltd. (2021-08 – 2022-11)

• Contributed to the development of full-stack web applications using Node.js, React.js, and MySQL.
• Assisted in migrating a monolithic system to microservices architecture, enhancing scalability and deployment flexibility.
• Implemented Role-Based Access Control (RBAC) and API-level security measures to strengthen application security.

B.Tech in Computer Science Engineering – Sagar Institute of Technology & Science (2019 – 2022)

Diploma in Information Technology – Samrat Ashok Technological Institute (2016 – 2019)