Senior Staff Java Engineer

RE Partners; Greater London; Hybrid; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Hybrid work model

Job summary

RE Partners in London seeks an experienced and opinionated Java Developer to join the high-performing engineering team, building low-latency, high-throughput payments systems.

You will design scalable real-time services using Core Java, Spring Boot, and RESTful APIs, while mentoring engineers and shaping architecture.

This hybrid UK role offers opportunities to work with OpenShift, AWS, MongoDB, and modern messaging patterns in a demanding payments environment.

Qualifications

• 7+ years Core Java development with 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.
• Solid understanding of MongoDB/NoSQL patterns.
• Experience in payments, financial services, or banking systems.
• Strong communication skills in an engineering-driven environment.

Responsibilities

• Design and build low-latency, high-throughput backend systems with Core Java and Spring Boot.
• Develop RESTful APIs and microservices powering secure payment workflows.
• Work with XML-based messaging standards used in financial transactions.
• Deploy and scale apps on OpenShift and AWS.
• Integrate MongoDB and other datastores; optimize data access.
• Collaborate with DevOps, Product, and QA teams.

Skills

Core Java

Spring Boot

Microservices

Low-latency design

XML handling

Communication

Payments domain knowledge

Tools

OpenShift

Kubernetes

MongoDB

Kafka

RabbitMQ

Job description

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

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
• 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

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
• Hybrid: London (UK)
• Fast-paced, collaborative, engineering-led culture
• Strong focus on autonomy, architectural decision-making, and clean code