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Chetan User

@chetanuser4

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I build scalable payment, AI, and data-intensive backend systems.

India

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I've led delivery of scalable payment platforms at PayPay, including 15+ Spring Boot microservices processing 60,000+ daily money-transfer transactions across QR payment flows.

I owned payment-feature design and delivery across teams, integrated PayPay with PayPay Bank for consumer payouts, and built reconciliation jobs that validated data across distributed services. I also resolved Kafka message-drop issues by implementing recovery processes.

At Vlabs.ai, I built commercially deployed computer-vision, quarantine-tracking, and document-intelligence products serving 10,000+ users or customers. My work included face recognition, GPS-based monitoring, PDF information extraction, and ticket classification.

I'm currently managing a team of four engineers while leading client-facing backend architecture, technical planning, delivery, and production readiness. I stay hands-on with Java, Kotlin, Python, Spring Boot, AWS, Kafka, distributed systems, and AI applications.

Experience

Work history, roles, and key accomplishments

Current

Engineering Manager / Consultant

Current

WFC - India

Dec 2025 - Present (9 months)

Collaborates with clients and cross-functional stakeholders to clarify requirements, manage technical risks, and ensure reliable delivery. Designs scalable backend systems and service integrations using Java, Python, Spring Boot, cloud services, databases, and event-driven architecture.

Java Python Spring Boot Cloud Services Databases Event Driven Architecture Software Technical Roadmaps System Design Stakeholder Management Mentorship

Senior Backend Engineer

PayPay Corporation

Aug 2022 - Dec 2025 (3 years 4 months)

Developed and enhanced 15+ Spring Boot microservices using Java and Kotlin, supporting Inbound Transfers and processing 60,000+ daily money-transfer transactions. Facilitated integration with PayPay Bank for consumer payout transactions and designed 7+ reconciliation jobs to validate data integrity.

Java Kotlin Spring Boot Microservices Kafka Distributed Systems Reconciliation Systems System Design Technical Leadership Mentorship

Research Staff Member

Vlabs.ai

Aug 2019 - Jul 2022 (2 years 11 months)

Developed a commercially deployed remote-monitoring solution using face-recognition technology, scaled to serve 10,000+ customers. Also developed a home-quarantine tracking system for Maharashtra Police and an automated financial-report analysis solution.

Python TinyDB NodeJS MySQL Face Recognition GPS Document Processing AI Machine Learning Team Leadership

Software Development Engineer

Amazon Development Center

Mar 2018 - Aug 2019 (1 year 5 months)

Developed an advertising service enabling Amazon associates to access catalog information and display products online across 13+ countries. Supported a high-throughput service handling 10,000+ transactions per second.

Java AWS Lambda Redshift RDS Elasticsearch S3 DynamoDB CompletableFuture Streaming High Throughput Systems

Senior Software Engineer

Samsung Research Institute

Jun 2016 - Mar 2018 (1 year 9 months)

Worked on the design of an automatic speech-recognition system and developed acoustic models for distinct English-language accents. Contributed to a lightweight neural-network inference framework for embedded devices.

C Kaldi Speech Recognition Acoustic Models Neural Networks Embedded Systems Testing