Senior Staff Java Engineer

We are seeking an experienced and opinionated Java Developer to join our high-performing engineering team, building low-latency, high-throughput systems in the payments processing domain. This hybrid role (UK) involves designing scalable, real-time services using modern technologies. If you’re passionate about performance, Core Java, and elegant engineering practices, we’d like to hear from you.

Key Responsibilities

• Design and develop low-latency, high-throughput backend systems using Core Java and Spring Boot
• Build and maintain RESTful APIs and microservices powering secure payment workflows
• Work with XML-based messaging standards used in financial transactions
• Deploy, monitor, and scale applications on Red Hat OpenShift and AWS
• Integrate and optimize solutions using MongoDB and other NoSQL/SQL datastores
• Collaborate closely with DevOps, Product, and QA teams
• Participate in architectural discussions and mentor engineers
• Lead performance tuning, fault tolerance, and observability improvements

Required Skills & Experience

• 7+ years Core Java development with strong performance/memory optimization
• Expertise in Spring Boot and microservices
• Proven experience building low-latency, high-throughput systems
• Hands-on experience with XML, message parsing, and transformation
• Deployment experience on OpenShift and/or Kubernetes
• Solid understanding of MongoDB / NoSQL patterns
• Experience in payments, financial services, or banking systems
• Strong communication skills and comfort in an opinionated, engineering-driven environment

Nice to Have

• Experience with Kafka, RabbitMQ, or similar messaging platforms
• Exposure to container security and performance tuning on OpenShift
• Knowledge of payment gateways, ISO 20022, SWIFT, or related standards
• Hybrid: London (UK)
• Fast-paced, collaborative, engineering-led culture
• Strong focus on autonomy, architectural decision-making, and clean code