Payments Senior Developer

Role Overview Insight Global is seeking a Senior Java Developer to design, develop, enhance, and support high‑throughput global payments applications. You will work across major programmes including ISO 20022 migrations, Real‑Time Payments enablement, payment engine modernisation, and regulatory scheme deliveries. This is a hands‑on engineering role requiring strong fundamentals in Java, microservices, integration, and payments processing. Key Responsibilities • Develop and enhance Java‑based microservices, REST APIs, and event‑driven components. • Implement solutions for ISO 20022 message formats, transformations (XML/JSON), validations, and routing. • Build integrations using Mule ESB (or similar), messaging patterns, and Kafka/event streams. • Write performant SQL/PL‑SQL queries for Oracle‑based transactional systems. • Contribute to system designs, code reviews, and technical discussions (not full architectural ownership). • Champion quality through TDD/BDD, automated testing (JUnit, Cucumber), and CI/CD best practices. • Work closely with DevOps/SRE to support smooth builds, deployments, and production readiness. • Collaborate effectively within Agile squads and across dependent teams, providing mentorship where needed. • Produce documentation aligned to standards and support regulatory/scheme milestones. Must‑Have Experience • 5–7+ years hands‑on software engineering (preferably within financial services or other high‑scale environments). • Strong experience with Java/J2EE, microservices, REST APIs, and event‑driven architecture. • Experience working with payments systems or messages (CHAPS, TARGET2, SWIFT, RTP, ISO 20022). • Proficiency in Oracle SQL/PL‑SQL, including writing efficient queries for high‑volume systems. • Solid understanding of XML/JSON structures and message mapping/transformation. • Experience with Mule ESB or equivalent middleware, messaging tools, and Kafka. • Strong understanding of Agile delivery, CI/CD pipelines, and DevOps practices. • Skilled in unit/integration testing frameworks (JUnit, Cucumber/Litmus). • Good communication skills and ability to collaborate in multi‑team delivery environments.