RE Partners
Senior Staff Java Engineer
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About the Role
We are seeking an experienced and opinionated Java Developer to join our high-performing engineering team, building low-latency, high-throughput systems in the payments processing domain. This hybrid role (UK) involves designing scalable, real-time services using modern technologies. If you’re passionate about performance, Core Java, and elegant engineering practices, we’d like to hear from you.
Key Responsibilities
- Design and develop low-latency, high-throughput backend systems using Core Java and Spring Boot
- Build and maintain RESTful APIs and microservices powering secure payment workflows
- Work with XML-based messaging standards used in financial transactions
- Deploy, monitor, and scale applications on Red Hat OpenShift and AWS
- Integrate and optimize solutions using MongoDB and other NoSQL/SQL datastores
- Collaborate closely with DevOps, Product, and QA teams
- Participate in architectural discussions and mentor engineers
- Lead performance tuning, fault tolerance, and observability improvements
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Required Skills & Experience
- 7+ years Core Java development with strong performance/memory optimization
- Expertise in Spring Boot and microservices
- Proven experience building low-latency, high-throughput systems
- Hands-on experience with XML, message parsing, and transformation
- Deployment experience on OpenShift and/or Kubernetes
- Strong AWS knowledge (ECS, EKS, Lambda, S3, etc.)
- Solid understanding of MongoDB / NoSQL patterns
- Experience in payments, financial services, or banking systems
- Strong communication skills and comfort in an opinionated, engineering-driven environment
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Nice to Have
- Experience with Kafka, RabbitMQ, or similar messaging platforms
- Exposure to container security and performance tuning on OpenShift
- Knowledge of payment gateways, ISO 20022, SWIFT, or related standards
Location & Work Environment
- Hybrid: London (UK)
- Fast-paced, collaborative, engineering-led culture
- Strong focus on autonomy, architectural decision-making, and clean code
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