Senior Java Developer

Insight Global are seeking a Senior Developer to design, develop, enhance, debug, support, maintain, and test payments technology applications that underpin a portfolio of global payments programmes.

These include ISO 20022 migrations (CHAPS, TARGET2, SWIFT CBPR+), real-time payments enablement, modernisation of payment engines/integration layers, and regulatory or scheme-driven delivery across multiple regions.

The Senior Developer will be a seasoned technologist contributing to the design and implementation of high-throughput, mission-critical services, including the message transformation and mapping layer that sits between internal payment engines and external schemes. This role does not manage direct reports but plays a key part in engineering delivery, cross-team collaboration, and maintaining high standards of code quality, reliability, and technical execution.

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 and maintain message mappings and transformations using Trace Financial Transformer, covering SWIFT MT-MX conversion, ISO 20022 scheme variants, and custom message validation rules.
• Build integrations using Mule ESB (or similar), messaging patterns, and Kafka/event streams.
• Deploy and integrate Transformer-generated mapping components into Java/REST-based integration layers as part of scheme migration and message routing pipelines.
• 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.

• Strong experience with hands-on Java/J2EE Development, microservices, REST APIs, and event-driven architecture.
• Experience working with payments systems, middleware or payment messages (CHAPS, TARGET2, SWIFT, RTP, ISO 20022).
• Hands-on experience with a financial message transformation/mapping tool such as Trace Financial Transformer (or equivalent, e.g. Volante, Bottomline), including building and maintaining message mappings and validations for MT-MX or ISO 20022 conversion.
• 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.

Nice to Have

• Bachelor's degree in Computer Science or related technical discipline.
• Certifications related to Java, Cloud, Kafka, MuleSoft, or SAFe.
• Direct experience deploying Trace Transformer mappings into a live integration architecture (Java, .NET, RESTful or Camel), rather than mapping-tool exposure alone.
• Experience with WebLogic/JBoss or other enterprise application servers.
• Background in payments platform modernisation or event-driven systems.
• Familiarity with operational resilience or highly regulated technology environments.