RE Partners
Lead Java Engineer - High Performance Systems
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Principal Java Developer
About RE Partners
We are a fast growing business and technology consultancy co-founded in 2019, specialising in custom-tailored, white-glove engineering services. We help clients succeed beyond technology—our supportive, high-performing teams deliver digital transformation by forming trusted partnerships with global organisations, including Fortune 500 companies and industry leaders.
Our ethos revolves around the "3 G’s":
- Get Shit Done.
- Get Over Shit.
- Give a Shit.
The Role
We’re looking for an experienced, opinionated and results-driven Principal Java Developer to join our engineering team, shaping low-latency, high-throughput systems in payments processing.
Based in the UK with a hybrid working model, this position focuses on building scalable, real-time services, and leveraging modern architectures.
This is your chance to embrace full ownership over architectural design and best-in-class engineering within a collaborative culture that values perfection, autonomy, and impact.
Key Responsibilities
- Design, develop, and optimise low-latency, high-throughput backend systems using Java.
- Develop and maintain RESTful APIs and microservices for secure payment workflows.
- Implement messaging standards and protocols for financial transactions.
- Deploy, monitor, and scale applications using Red Hat OpenShift and AWS cloud environments.
- Integrate MongoDB and NoSQL/SQL databases for real-time data management.
- Collaborate with DevOps, Product, and QA teams to deliver production-grade solutions.
- Drive architectural improvements, and provide mentorship to junior developers.
- Focus on performance tuning, fault tolerance, and observability across services.
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Required Skills & Experience
- 10+ years of Java development experience, with a focus on performance and memory optimisation.
- Proficient in MongoDB, Spring (e.g., Spring Boot), and microservices.
- Hands-on experience with low-latency (ideally <1ms response times), high-throughput applications.
- Strong experience building and deploying applications in Red Hat OpenShift or Kubernetes.
- Deep cloud expertise with AWS (ECS, EKS, Lambda, S3, etc.).
- Strong communication skills with a bias towards action and opinionated design decisions.
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Nice to Have
- Exposure to messaging systems (Kafka, RabbitMQ).
- Experience in payments processing, banking, or financial services.
- Understands container security or performance tuning in OpenShift.
- Knowledge of payment gateways, ISO 20022, or SWIFT formats.
About the Work Environment
- Hybrid model, based in London, UK.
- A fast-paced, collaborative, and highly technical engineering-driven culture.
- Emphasis on engineering ownership, architectural decision-making, and clean, maintainable code.
Join Our Team – Equal Opportunity Employer
At RE Partners, we pride ourselves on being a diverse, woman-owned global business, constantly evolving to keep our top talent happy (only 7% attrition rate!). We invite you to apply and refer talented friends for potential referral bonuses.
As an equal opportunity employer, we welcome applications from individuals of all backgrounds, regardless of race, colour, religion, gender, sexual orientation, age, disability, or veteran status.
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Jessica, London
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