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Sachin Kumar

@sachinkumar37

Backend Developer at Infosys who built a DigiLocker KYC pipeline that cut identity verification from 3 days to under 5 minutes.

India

Message

At Infosys, I architected a real-time KYC verification pipeline integrating DigiLocker via API Setu, with Redis caching for secure data storage. It reduced manual processing latency from 3 days to under 5 minutes.

I also developed the ITAT backend module with Java and Spring Boot, using distributed caching and Apache Kafka for event-driven email communications. I remediated a security vulnerability affecting bank account operations on deceased user profiles and modernized tax platforms serving 130M+ users.

Previously, at Tata Consultancy Services, I optimized Java and Spring Boot APIs, improving average response time by 10%, and strengthened Aadhaar authentication security. I also developed document retrieval microservices and delivered a full-stack solution with a React.js frontend.

Experience

Work history, roles, and key accomplishments

Current

Backend Developer

Current

Infosys

Nov 2025 - Present (11 months)

Architected a real-time KYC verification pipeline integrating DigiLocker via API Setu, reducing manual processing latency from 3 days to under 5 minutes. Designed and developed the ITAT backend module using Java and Spring Boot, integrating Apache Kafka for asynchronous communications.

Java Spring Boot Redis Kafka REST APIs Microservices Junit Mockito Test Driven Development Agile Scrum Jira

Software Developer

Tata Consultancy Services

Nov 2021 - Nov 2025 (4 years)

Redesigned and optimized RESTful API services using Java, Spring Boot, and JPA, reducing average API response time by 10%. Hardened security for a national digital identity authentication system, improving authentication efficiency by 40%.