Senior Backend Software Engineer

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.

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.

Experience working in a FinTech or start-up environment.

Exposure to observability tools

Familiarity with security and authentication patterns (OAuth, SAML, etc.).

APEXX is a global payment orchestration platform with teams across the UK & India, helping enterprise businesses simplify the complexity of payments. For more than a decade, we've been building technology that enables merchants to connect to the world's payment ecosystem through a single, scalable integration.

Our platform gives businesses access to 200+ acquirers , 150+ alternative payment methods , and 10+ Buy Now, Pay Later providers , helping them optimise payment performance, improve acceptance rates, and expand into new markets with confidence.

Trusted by leading global brands including Ryanair, TUI, Hotelbeds, CarTrawler, Avon, and Jet2 , we're redefining enterprise payments by making them smarter, faster, and more reliable.

As we continue to grow, so do the opportunities to make an impact. Whether you're building products, solving complex engineering challenges, or supporting the teams behind them, you'll play a meaningful role in shaping the future of global payments at APEXX.

To learn more about APEXX and experience the dynamics of being part of our team, feel free to check out the provided media channels below:

LinkedIn: https://www.linkedin.com/company/apexxglobal/

Instagram: https://www.instagram.com/apexx.global/?hl=en

Main Website: https://apexx.global/

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.