Senior Software Engineer

APEXX is pioneering payment orchestration, transforming the global payments landscape with cutting-edge technology and innovation. As a leader in Fintech, we're committed to excellence, driving forward-thinking solutions that empower businesses worldwide.

Are you passionate about building scalable, resilient systems in the fast-moving world of FinTech?

Senior Backend Engineer

You’ll play a key role in designing and building backend services that power our core platform enabling real-time transactions, intelligent routing, and seamless third-party integrations with partners across the financial ecosystem.

You’ll work with a modern tech stack including Java Spring Boot, PostgreSQL, Redis, AWS Lambda, and a wide range of AWS services and collaborate closely with engineers, product managers, and stakeholders to deliver reliable, high-performance systems.

If you thrive in a collaborative, fast-paced environment and enjoy solving complex engineering challenges, this could be a great fit.

WHAT YOU’LL BE DOING

• Design, develop, and maintain backend services (utilising Java Spring Boot), contributing to the evolution of our platform and system architecture.
• Optimise backend systems for real-time processing, performance, resilience, and scalability to meet the demands of a growing, enterprise customer base.
• Implement integrations with third-party systems, ensuring secure and reliable data exchange across environments.
• Participate in the full software delivery lifecycle — from requirements gathering to production deployment and ongoing support.
• Troubleshoot production issues and contribute to a culture of operational excellence and continuous improvement.
• Collaborate closely with product managers, designers, and fellow engineers to ensure technical solutions align with business objectives.
• Provide high-quality code reviews and mentor junior engineers where appropriate.
• Contribute to infrastructure and DevOps best practices, including CI/CD pipelines and containerised deployments.

ABOUT YOU

• Proven experience designing and delivering robust backend systems, with a strong focus on scalability, maintainability, and performance.
• Deep understanding of relational databases, including hands-on experience with PostgreSQL, and confidence in writing optimised SQL.
• Practical experience with AWS services, such as Lambda, API Gateway, ECS, and S3, and an appreciation of serverless and event-driven architectures.
• Familiarity with DevOps practices, including CI/CD pipelines, containerisation, and infrastructure-as-code.
• Strong problem-solving skills and a structured, delivery-oriented mindset.
• Comfortable working cross-functionally in fast-paced Agile environments, with clear communication and a collaborative approach.
• Passionate about clean code, continuous learning, and building systems that are resilient and easy to operate at scale.

NICE TO HAVE

• Experience working in a FinTech or start-up environment.
• Exposure to observability tools
• Familiarity with security and authentication patterns (OAuth, SAML, etc.)

Perks and Benefits:

Aside from the opportunity to work for a tech-scale up, having great responsibility and varied tasks every day, other benefits includes:

Health:

15 personal days per year + Festival holidays. You can also take your birthday off as paid leave, and we offer a paid day off for any charity work you want to participate in.

Enrichment:

Social:

ABOUT APEXX

APEXX

Most Disruptive Payment Technology'

The team is incredibly committed and enthusiastic about what we are building - top of the class payments solutions and a valuable business. This is infectious and creates a wonderful office atmosphere. We have a supportive, relaxed yet high-performing, and high trust culture.

Apexx is an equal opportunities employer committed to encouraging equality, diversity, and inclusion among our employees and eliminating discrimination.

We do not accept speculative CVs or candidate profiles from Recruitment Agencies.