Java Backend Developer External Agency Payroll Provider

About This Role

This 12-month contract role is for a senior backend and distributed systems engineer with extensive experience designing, building, and operating mission-critical financial systems. The team is building a strategic new channel that brings investment capabilities directly to the bank's external clients through seamless integration with the e-banking platform. Engineers joining the team will have the opportunity to shape the architecture, scalability, and operational model of this highly visible initiative from an early stage.

Responsibilities

• Design and evolve robust distributed systems, balancing scalability, latency, consistency, and fault tolerance
• Apply distributed systems principles (e.g., consistency models, idempotency, back-pressure, resiliency patterns) to real-world financial workloads
• Develop and maintain high-performance backend services and APIs using Java, Spring, and Spring Boot
• Optimize end-to-end latency, asynchronous processing, and efficient IO
• Identify and resolve performance bottlenecks through profiling, benchmarking, and load testing
• Integrate complex financial platforms and third-party services, ensuring correctness, data integrity, and operational resilience
• Contribute to the expansion of the platform into digital client channels, designing and building backend services that power client-facing wealth and investment capabilities integrated into the bank's e-banking ecosystem
• Design reliable messaging and integration flows using JPA, JDBC templates, JMS, and event-driven patterns
• Write clean, maintainable, and efficient code while adhering to industry best practices, including code reviews, testing, and CI/CD
• Apply financial-grade engineering principles (auditability, security, controlled change)
• Work closely with product managers, designers, and other stakeholders to gather requirements and translate them into technical specifications and deliverables

Requirements

• Extensive experience designing, building, and operating mission-critical financial systems
• Proven expertise in Java-based backend architectures, distributed systems, and low latency, high availability services
• Strong production mindset with end-to-end ownership across the full software lifecycle—from architecture and design through deployment, operations, and optimization
• Comfortable acting as a technical authority in complex, globally distributed environments
• Languages & Platforms: Java (Core Java, Collections, JSON, JDBC), Spring Framework, Spring Boot
• Architecture: Distributed systems, microservices, event-driven design, low-latency systems
• Databases & Messaging: JPA, JDBC, relational databases, JMS
• Operating Systems: Unix/Linux, bash scripting