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Nishant Kumar

@nishantkumar11

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Lead Backend Engineer scaling secure microservices for fintech and payments.

India

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What I'm looking for

I’m looking for a role where I can lead backend and microservices in fintech—building secure, scalable systems on AWS/Kafka, improving latency and reliability. I also want to drive practical AI automation using APIs and strong prompt engineering.

I’m a Lead Backend Engineer with 8+ years of experience designing and scaling secure, high-performance, cloud-native platforms in fintech and payments. I specialize in microservices, Node.js/TypeScript, AWS, Kafka, and advanced security protocols like OAuth 2.0, SSO, and AES-256—consistently improving latency (99%+), transaction success (10–20%+), and resiliency in large distributed systems.

I’ve led teams of 5–6 engineers and built backend systems end-to-end, including a Control Center that handles secure authentication and usage-limit controls, an in-house event tracking system, and platform work for Axis Bank’s corporate clients and Mutual Funds revamps. Recently, I explored AI integration by implementing OpenAI’s ChatGPT API for intelligent automation, along with prompt engineering to optimize outputs.

Experience

Work history, roles, and key accomplishments

Current

Lead Software Development Engineer

Current

Freecharge By Axis Bank

May 2023 - Present (3 years)

Led backend development for Freecharge’s Axis Bank modules (Safety Center, Neo-One, and Mutual Funds revamp), building microservices and implementing strong security (API keys, OAuth 2.0, SSO, AES-256) for secure authentication and data access. Developed an in-house event tracking system for user-journey analytics and improved performance, resiliency, and transaction success through security and r

TypeScript Microservices REST APIs AWS Kafka OAuth 2.0 SSO AES 256 Encryption Redis

Software Development Engineer - II

Novo Pay

Nov 2022 - May 2023 (6 months)

Architected the breakdown of a monolithic codebase into microservices to improve scalability, efficiency, and engineering agility. Collaborated with product and engineering stakeholders to support incremental modernization of the fintech platform.

Microservices System Design REST APIs TypeScript Agile Scrum CI CD Docker

Senior Software Engineer

Paytm

Sep 2020 - Nov 2022 (2 years 2 months)

Built an end-to-end order reconciliation microservice from scratch by consuming data from multiple Kafka pipelines to prevent monetary loss. Reduced NPCI cache misses by 13% and improved response time from 15 seconds to 3 milliseconds (99.98% faster), while increasing BBPS transaction success rate by 12% using authentication-token caching with auto-refresh, retry, and state management.

Kafka Microservices REST APIs Redis Retry Logic State Management System Design Performance Optimization Observability

Software Engineer

Classplus

Jul 2018 - Jun 2020 (1 year 11 months)

Analyzed requirements and designed, developed, and implemented REST APIs for white-label applications serving nearly 10,000 clients. Built an online store portal from scratch enabling tutors to publish courses and support course purchase and resale workflows.

REST APIs API Design Backend Development System Design TypeScript Git Agile Scrum

Software Developer

Creatiosoft Solutions

Jan 2017 - Jun 2018 (1 year 5 months)

Developed web dashboards for multiple casino games (Poker, Teen-Patti, Slots) and maintained distributed game-server code for these platforms. Worked on ongoing backend maintenance to support reliable game operations and data presentation.

Distributed Systems Game Server Maintenance Backend Engineering REST APIs Git Agile Scrum Performance Tuning Troubleshooting