Senior Backend Developer – Payments Work Location: Singapore Role Overview: Join our team to design and scale mission-critical payment systems that power millions of transactions across international card networks, real-time QR payments, and high-volume switching platforms. Your work will support both retail POS and e-commerce environments, where every millisecond impacts revenue, reliability, and trust. What You’ll Do: - Design and build high-performance backend systems supporting Visa, Mastercard, Amex, and UPI payment integrations at scale. - Architect secure, scalable solutions across authorization, clearing, settlement, and merchant onboarding workflows end-to-end. - Lead modernization initiatives, migrating legacy payment platforms to Linux RHEL or cloud-based architecture environments. - Optimize switching systems for ultra-high transaction volumes, ensuring low latency, resilience, and consistent system uptime. - Collaborate with product, QA, and business teams to deliver reliable, production-grade payment capabilities globally. What You Bring: - 8+ years of backend development experience with deep exposure to payment systems, switching platforms, and transaction processing environments. - Proven expertise in C++, Linux environments, and scripting (e.g., Korn Shell) within high-availability production systems. - Hands-on experience with Base24, international card scheme integrations, and modern QR payment ecosystems. - Solid understanding of databases (PostgreSQL/MySQL), messaging systems (IBM MQ), and distributed system performance tuning. - Familiarity with POS/EDC, ATM systems, and payment infrastructure across both physical and digital transaction channels. Why This Role Stands Out: Your work will directly power real-world transactions, from retail terminals to online payments, impacting customer experience, system reliability, and business growth. You’ll operate in a high-scale environment with modern infrastructure, solving complex challenges in performance, security, and system evolution. Contact: If you’re interested in building payment systems where scale, speed, and reliability truly matter, let’s connect. Reach out to Naveen at naveen.vasudevan@tangspac.com