Open to opportunities

Devansh Maheshwari

@devanshmaheshwari

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Backend engineer building certified fintech payment systems with Java microservices, Kafka/MQ, and ISO 20022/UPI.

India

Message

What I'm looking for

I’m looking for backend roles in fintech payments where I can build low-latency Java microservices for ISO 20022/UPI/IMPS, own protocol compliance and certifications, and improve throughput and observability with Kafka/MQ and cloud ops.

I’m a backend engineer with 3+ years building NPCI-certified fintech systems at 15k+ TPS in production, specializing in SEPA, IMPS, BBPS, and UPI 6.0. At Mindgate Solutions, I architected an end-to-end CITI SEPA Credit Transfer system as 12 Java 21 microservices, delivering 15k TPS for 6+ months with sub-second end-to-end latency while sustaining RT1 SLAs.

I design protocol-first payment foundations: a bidirectional ISO 20022 transformation engine with RT1-compliant validation and dual-channel messaging (Kafka for routing, IBM MQ for SWIFT/RT1 relay) with idempotency and dead-letter handling. I’ve also led IMPS 2.0 real-time system work (IBM MQ switch, NPCI certification, UAT sign-off) and the BBPS middleware build for YesBank with ECIES/ECDSA encryption and Mutual TLS; recently, I developed a full-stack UPI 6.0 NPCI switch simulator to help TPAPs validate API surfaces without live integrations.

Experience

Work history, roles, and key accomplishments

Current

Backend Engineer - Fintech

Current

Mindgate Solutions

Jul 2023 - Present (2 years 11 months)

Built NPCI-certified SEPA, IMPS, BBPS, and UPI 6.0 payment systems, architecting SEPA Credit Transfer as 12 Java 21 microservices processing 15k TPS in Citi production while maintaining sub-second end-to-end latency and RT1 SLA compliance. Developed ISO 20022 transformation and bidirectional routing with Kafka/IBM MQ, delivered BBPS middleware with 100% NPCI/NBBL security compliance (ECIES/ECDSA +

Java 21+Spring Boot Microservices Kafka ISO 20022 SEPA IMPS BBPS Middleware