Principal Java Engineer: Low-Latency Payments, Hybrid UK

RE Partners; Greater London; Hybrid; GBP 130,000 - 170,000; Full time

Benefits offered by this job

Hybrid work model

Job summary

RE Partners seeks an experienced Principal Java Engineer to join a high-performing team tackling low-latency, high-throughput payment systems. Hybrid role in the UK with modern tech stack and real-time services.

You will own design decisions, mentor peers, and drive performance and observability enhancements across services. The ideal candidate has 10+ years in Java, SpringBoot, microservices, and cloud deployments (OpenShift/Kubernetes, AWS).

Qualifications

• 10+ years of Java development with a focus on performance and memory optimization.
• Strong Spring, MongoDB, and microservice-based architecture experience.
• Proven track record in low-latency, high-throughput systems (sub-millisecond response times a plus).
• Hands-on experience deploying applications on OpenShift and/or Kubernetes.
• Cloud proficiency with AWS services (ECS, EKS, Lambda, S3).
• Excellent communication and bias toward action with opinionated design decisions.

Responsibilities

• Design, develop, and optimize low-latency, high-throughput backend systems using Java.
• Build and maintain RESTful APIs and microservices powering secure payment workflows.
• Work with messaging standards used in financial transactions.
• Deploy, monitor, and scale applications in OpenShift and AWS cloud environments.
• Integrate with MongoDB and other datastores for real-time data management.
• Collaborate with DevOps, Product, and QA to ensure production-grade solutions.
• Drive architectural changes and mentor peers.
• Drive performance tuning, fault tolerance, and observability improvements across services.

Skills

Core Java

Spring Boot

Microservices

Performance optimization

OpenShift/Kubernetes

AWS

MongoDB

System design/architecture

Mentorship

Communication

Tools

Red Hat OpenShift

Kubernetes

MongoDB

AWS (ECS/EKS/Lambda)

Git

Job description

RE Partners seeks an experienced Principal Java Engineer to join a high-performing team tackling low-latency, high-throughput payment systems. Hybrid role in the UK with modern tech stack and real-time services.

You will own design decisions, mentor peers, and drive performance and observability enhancements across services. The ideal candidate has 10+ years in Java, SpringBoot, microservices, and cloud deployments (OpenShift/Kubernetes, AWS).