Senior Java Developer (Low-Latency Payments Systems) 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. 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 digital transformation is more than just technology. With a successful track record as a preferred vendor for Fortune 500 companies and a trusted partner for leading industry players, our global talent has helped many clients achieve their goals. 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 data stores 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. Collaborative, fast‑paced, and engineering‑driven culture. Emphasis on engineering autonomy, architectural decision‑making, and clean code.

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 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. Seniority level Mid‑Senior level Employment type Full‑time Job function Engineering and Information Technology Industries IT Services and IT Consulting and Banking #J-18808-Ljbffr