Senior Backend Engineer - London

Your Mission

As a Senior Software Engineer at the company, you will play a crucial role in shaping the future of the company's technology, driving innovation, and ensuring we deliver a seamless, high-performance experience for our merchants across Europe. You will work with diverse, cross‑functional teams to design, develop, and maintain core components of our systems that power various aspects of our business, from payments processing and core banking to merchant lifecycle management and internal operations. Your contributions will directly impact our merchants' success, enabling them to thrive in an increasingly competitive landscape.

As a Senior Software Engineer at the company, you will be expected to:

• Design, develop, and maintain clean, efficient, secure, and well‑tested code to support critical business needs, ensuring scalability, performance, and reliability across the company's systems.
• Take ownership of features and projects throughout the full software development lifecycle, including scoping, design, development, testing, deployment, and maintenance.
• Collaborate closely with cross‑functional teams (including product, design, data science, security, and operations) to understand requirements, provide technical insights, and contribute to architecture discussions.
• Build tools and integrate systems to enhance operational efficiency, reliability, and scalability of products across the business.
• Contribute to process improvements, focusing on continuous integration, delivery, and deployment to ensure a smooth and stable development pipeline.
• Participate in code reviews, share feedback constructively, and help elevate the overall quality and performance of the team's output.
• Mentor and support fellow developers, fostering a collaborative and innovative environment.
• Stay updated with the latest trends and technologies in software engineering, payments, and fintech, proactively identifying opportunities for improvement and innovation.
• Assist in troubleshooting complex issues related to our systems, providing timely resolutions to ensure uninterrupted service for our customers.
• Help define and promote best practices in software development, including code quality, testing, automation, and security.
• Serve as a subject matter expert in key areas, providing guidance and support to other teams.

Requirements

• 5+ years of professional software development experience, with a solid understanding of backend systems, scalable architectures, and software design principles.
• Expertise in Java (17+), Spring Boot, and modern backend engineering practices.
• Experience with system design and architecture, including object‑oriented design patterns, microservices architecture, and API development.
• Experience building systems for high throughput, low latency, and reliability.
• Experience in data structures and performance trade‑offs.
• Excellent communication skills with the ability to influence and align stakeholders.
• Strong problem‑solving skills and the ability to debug complex issues across multiple systems or services.
• Experience working in an Agile/Scrum development process.
• Ability to work well as part of a team and independently in a fast‑paced environment.

Nice to have

• Degree in computer science, engineering, or a related field.
• Previous experience in the Payments Industry, fintech, or Location and Business Recommendation Services platforms.
• Experience with cloud infrastructure (AWS, Kubernetes, Helm).
• Experience with current or specific frameworks, SDKs, APIs, and libraries relevant to the company's technology stack (e.g. Laravel, Spring, Reactor).
• Familiarity with authorization systems (e.g., RBAC, ABAC, SpiceDB).
• Experience with Behavior‑Driven Development (BDD) or Test‑Driven Development (TDD).
• Experience with CI/CD pipelines.

The Perks

• Flexible working hours that suit both you and your team.
• Health Insurance.
• Physical and mental health support through our partnership with MyFitness.
• 25 days of Annual leave (+ Bank Holidays).
• Possibility to visit other company offices to meet colleagues when travel is safe and appropriate.
• Friday lunch in the office.
• Friendly, comfortable, and high‑end work equipment and informal office environment.
• Hybrid work mode policy.

Equal Opportunity Employer

We are committed to creating an inclusive environment where everyone, regardless of race, ethnicity, gender identity or expression, sexual orientation, age, disability, religion, or background, can thrive and do their best work. We believe that a diverse team leads to better ideas, stronger outcomes, and a more supportive workplace for all. If you require any reasonable adjustments at any stage of the recruitment process—whether for interviews, assessments, or other parts of the application—we encourage you to let us know. We are committed to ensuring that every candidate has a fair and accessible experience with us.