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Sr. Payment Engineer at Weekday AI. This role is for one of the Weekday's clients. Salary range: Rs 5000000 - Rs 5400000 (ie INR 50-54 LPA). Min Experience: 4 years. Location: Remote (India). JobType: full-time. We are seeking a Senior Payment Engineer to join our core engineering team. This is a hands-on role dedicated to building ultra-low-latency infrastructure for real-time settlements across both fiat and crypto payment rails. You’ll work in a fast-paced, high-impact environment, tackling complex backend challenges at the intersection of finance and technology.. If you have experience developing high-speed financial systems, integrating payment gateways, or working with blockchain-based transactions, you’ll thrive in this role.. What You’ll Do. . Design, build, and maintain real-time, event-driven payment systems using NestJS and NodeJS. . . Integrate with both fiat payment systems (UPI, card networks) and crypto platforms (Ethereum, Polygon). . . Architect for scalability, fault tolerance, and ultra-low latency using Kafka, Redis, and PostgreSQL. . . Collaborate closely with product and infrastructure teams to deliver features from concept to production. . . Participate in code reviews, architecture discussions, and team mentoring. . . Continuously enhance performance, security, and reliability of backend services. . . What We’re Looking For. . 4–6 years of experience building production-grade backend systems. . . Strong expertise in NodeJS/NestJS and asynchronous system design. . . Proven background in payment systems, financial platforms, or crypto protocols. . . Solid understanding of distributed architectures and data modeling. . . Proficiency with PostgreSQL, Redis, Kafka, and AWS. . . Strong focus on performance optimization and security best practices. . . Nice to Have. . Experience with smart contract development or Web3 technologies. . . Previous work in fintech, payments, or crypto infrastructure. . . Exposure to high-frequency trading systems or payment compliance frameworks.. . Company Location: India.