Java Developer - Payment Domain

Senior Java Developer – Payments Domain

Hyderabad, Telangana, India (On-site / Hybrid)

5+ years in Java development, with significant exposure to payments / financial services / fintech domain.

• Strong Java skills — Java SE / EE, Spring Boot, multi‑threading, collections, design patterns, good mastery of core Java.
• Payments Domain Knowledge — Experience with payment processing flows, gateways, PCI-DSS standards, UPI, credit / debit cards, wallets, settlement, reconciliations, transaction life‑cycle.
• APIs / Microservices — Building, consuming, securing (OAuth, JWT etc.), scaling, versioning.
• Database skills — Relational databases (Oracle, MySQL, PostgreSQL etc.), NoSQL (if applicable), writing optimized SQL, performance tuning.
• Messaging / Event‑Driven Architecture — Kafka, RabbitMQ or similar; real‑time event processing.
• Integration — Integrations with third‑party payment gateways / acquirers / banks / PSPs; understanding of protocols (e.g. ISO 8583, XML/JSON over HTTPS), callbacks, webhooks.
• Security & Compliance — Understanding of security best practices, encryption, tokenization, data privacy; knowledge of PCI‑DSS or similar standards is a plus.
• Testing & Quality — Unit testing (JUnit / TestNG), code coverage, integration tests; familiarity with continuous integration, code review, static code analysis.
• Tools — Build tools (Maven / Gradle), version control (Git), containerization (Docker), monitoring / logging tools (e.g., ELK, Splunk).

• Design, develop, and maintain Java‑based microservices / modules for payments processing.
• Work on end‑to‑end payments flows: initiation, authorization, clearing, settlement, refunds, reconciliation etc.
• Integrate with external payment service providers, banks, acquirers, gateways; handle callbacks, error codes, transaction status updates etc.
• Ensure high performance, reliability and scalability of the payment systems; optimize for latency, throughput, concurrency.
• Enforce security and compliance norms (PCI, encryption, tokenization, sensitive data handling).
• Debug & resolve production issues, monitor transactions, ensure proper handling of failures, retries, exceptional scenarios.
• Write unit and integration tests, ensure code quality via reviews, adherence to best practices.
• Participate in architectural discussions; suggest enhancements / improvements in system design.
• Collaborate with cross functional teams (product, QA, operations) to define requirements, propose solutions.
• Maintain documentation: APIs, transactional flows, error handling, SLA definitions.

• Experience with UPI, NEFT/RTGS, IMPS, Wallets, Cards, Recurring payments, etc.
• Familiarity with ISO 8583 or other payments messaging standard.
• Experience with cloud platforms (AWS, Azure, GCP), container orchestration (Kubernetes).
• Knowledge of DevOps practices, CI/CD pipelines.
• Exposure to performance testing, load testing.
• Exposure to modern architectures (event sourcing, CQRS, streaming).
• Some exposure or skills in front‑end or UI might help if product includes dashboards.