Ajay Thakur — Software Engineer

Senior Java Backend Engineer with 8+ years of experience building high-performance, scalable systems, specializing in issuer-side payment processing and real-time transaction platforms. I have hands-on experience designing issuer-side payment gateways, working on end-to-end transaction flows including ISO 8583 message processing, transaction routing, and integrations with card networks like Visa and Mastercard. I’ve also worked with HSM systems for secure PIN/CVV validation and have a strong understanding of PCI-DSS and payment security standards. Previously, I contributed to high-scale systems at PayPal, optimizing SLA performance and improving throughput in real-time processing pipelines. My core expertise includes building high TPS systems, microservices and event-driven architectures, and designing fault-tolerant, low-latency backend systems. Currently, I’m exploring AI integration (LLMs, RAG) in backend systems, especially for fraud detection and intelligent payment insights. I’m passionate about solving complex fintech problems and designing scalable, resilient architectures.

Stackforce AI infers this person is a Fintech Backend Engineer with expertise in payment systems and microservices.

Location: Hyderabad, Telangana, India

Experience: 8 yrs 7 mos