Senior Java Architect - Low-Latency Payments (Hybrid UK)

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

Job summary

RE Partners is seeking an experienced Principal Java Engineer to join our high-performing engineering team in a hybrid London-based role. You will design and optimize low-latency, high-throughput backend systems in the payments domain, building scalable real-time services with Java, Spring, and microservices.

You will lead RESTful APIs, integrate with NoSQL/SQL data stores, deploy on OpenShift/Kubernetes, and work closely with DevOps, Product, and QA teams to ensure production-grade solutions.

Qualifications

• 10+ years of experience in Java development with focus on performance and memory optimization.
• Proficient in Mongo, Spring and microservice-based architecture.
• Experience with low-latency, high-throughput applications (sub-millisecond response times a plus).
• Hands-on experience deploying applications on OpenShift and/or Kubernetes.
• Strong cloud experience with AWS services such as ECS, EKS, Lambda, S3, etc.
• Strong communication skills and a bias toward action and opinionated design decisions.

Responsibilities

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

Skills

Java

Performance

Spring

Microservices

REST APIs

MongoDB

OpenShift

Kubernetes

AWS

Cloud architecture

Tools

OpenShift

Kubernetes

MongoDB

AWS (ECS/EKS)

Job description

RE Partners is seeking an experienced Principal Java Engineer to join our high-performing engineering team in a hybrid London-based role. You will design and optimize low-latency, high-throughput backend systems in the payments domain, building scalable real-time services with Java, Spring, and microservices.

You will lead RESTful APIs, integrate with NoSQL/SQL data stores, deploy on OpenShift/Kubernetes, and work closely with DevOps, Product, and QA teams to ensure production-grade solutions.