Senior Java Developer (Low-Latency Payments Systems)

RE Partners; Greater London; Hybrid; GBP 65,000 - 85,000; Full time

Job summary

A dynamic technology consulting firm based in the UK is on the lookout for an experienced Java Developer. The role requires expertise in Core Java and SpringBoot, focusing on developing high-throughput systems in the payments processing domain. Responsibilities include designing and optimizing backend systems, building RESTful APIs, and collaborating with various teams to ensure production-grade solutions. The ideal candidate should be passionate about performance and thrive in a collaborative engineering culture. This hybrid position offers a unique opportunity to drive innovation while being part of an inclusive team.

Qualifications

• 5+ years of experience in Core Java development.
• Proficient in SpringBoot and microservice architecture.
• Experience with low-latency, high-throughput applications.

Responsibilities

• Design, develop, and optimize low-latency backend systems.
• Build and maintain RESTful APIs and microservices.
• Deploy applications in Red Hat OpenShift and AWS.

Skills

Core Java

SpringBoot

Microservices

AWS

MongoDB

Tools

Red Hat OpenShift

Kubernetes

Job description

Who We Are

Who We Are: We are a fast growing business and technology consultant company co-founded in 2019. We offer a custom-tailored, white-glove engineering service fit for our clients, because a digital transformation is more than just technology. With a successful track record of being a preferred vendor for Fortune 500 companies and as a trusted partner for some of the industry’s leading companies, our global talent has helped many clients achieve their goals.

The 3 G’s of RE

The 3 G’s of RE:

“Get Shit Done.”

“Get Over Shit.”

“Give a Shit.”

We are seeking an experienced and opinionated Java Developer to join our high-performing engineering team, working on low latency, high-throughput systems in the payments processing domain. This hybrid role is based in the UK or US and offers the opportunity to build scalable, real-time services using modern technologies. If you’re passionate about performance, have strong Core Java and SpringBoot expertise, and thrive in a collaborative yet opinionated engineering culture, we want to hear from you.

Key Responsibilities

• Design, develop, and optimize low-latency, high-throughput backend systems using Core Java and SpringBoot.
• Build and maintain RESTful APIs and microservices that power secure payment workflows.
• Work with XML-based 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.
• Participate in architectural discussions, advocate for best practices, and provide mentorship to peers.
• Drive performance tuning, fault tolerance, and observability improvements across services.

Required Skills & Experience

• 5+ years of experience in Core Java development with a focus on performance and memory optimization.
• Proficient in SpringBoot and microservice-based architecture.
• Proven experience with low-latency, high-throughput applications (sub-millisecond response times a plus).
• Experience working with XML and message parsing/transformation.
• Hands-on experience deploying applications on Red Hat OpenShift and/or Kubernetes.
• Strong cloud experience with AWS services such as ECS, EKS, Lambda, S3, etc.
• Solid understanding of MongoDB and NoSQL design patterns.
• Prior experience in Payments Processing, financial services, or banking systems.
• Strong communication skills and a bias toward action and opinionated design decisions.

Nice to Have

• Familiarity with messaging systems (Kafka, RabbitMQ, etc.)
• Exposure to container security and performance tuning on OpenShift.
• Knowledge of payment gateways, ISO 20022, or SWIFT formats.
• Collaborative, fast-paced, and engineering-driven culture. Emphasis on engineering autonomy, architectural decision-making, and clean code.

Join Our Global Team

Join Our Global Team: We invite you to apply for the position at RE Partners. Join us in shaping the future of business technology consulting and transforming the way organizations thrive in a digital world. As a diverse, woman-owned global business, we pride ourselves on keeping talent happy – our 7% attrition rate speaks volumes. Bring your talented friends along and earn a referral bonus

Equal Opportunity Employer

Equal Opportunity Employer: We are an equal opportunity employer and welcome applications from all qualified individuals regardless of race, color, religion, gender, sexual orientation, gender identity or expression, national origin, age, disability, or veteran status.