Senior Backend Engineer

About the role

At SumUp, we're on a mission to bring merchants and consumers closer together and help local communities thrive. Within the Consumer Mission, we're building a rewarding banking experience that connects people to the small businesses they love while tackling some of the most technically demanding challenges in fintech: critical infrastructure migrations, smooth, uninterrupted payment experiences, seamless open banking integrations, and high‑availability banking systems that can't afford to fail - all while enabling free transactions for our merchants. This role sits at the heart of that work - you'll take real ownership of backend services that are close to our consumers, directly shaping their everyday experience, with impact that's visible and felt across the entire platform. 🎥 Take a look inside our London office

Responsibilities

• Build and maintain Backend services for Core neobanking features including bank transfers, open banking, savings accounts, and payment processing
• Take end-to-end ownership of features and projects, covering scoping, design, development, testing, deployment, and maintenance, leveraging Go along with Docker and Kubernetes for container orchestration.
• Take ownership of critical infrastructure migrations - including our banking core system transitions - without disrupting live customer experiences
• 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 that ship meaningful banking features end-to-end
• Support fellow developers and actively help build a collaborative, innovative engineering culture
• Shape technical architecture and lead code reviews, helping define and promote best practices in code quality, testing, automation, and security to raise the overall engineering bar.
• Build and integrate tools and systems that improve operational efficiency and reliability, with strong observability through monitoring, alerting, and hands‑on involvement in incident response and post‑mortems.
• You'll be great for this role if you have...
• Strong proficiency in Go, Kotlin or Python, with a track record of building scalable, production-grade backend services
• Experience working with cloud platforms (AWS or comparable) and container orchestration tools such as Docker and Kubernetes
• Solid understanding of SQL and NoSQL databases, distributed systems, and the trade-offs that come with high-availability requirements
• Comfort navigating complex, regulated environments - whether that's financial services, payments, or similarly high-stakes domains
• A collaborative, product-oriented mindset with the ability to work independently, communicate clearly, and adapt when priorities shift
• Any of the following would be considered a plus
• Previous experience in a Growth-focused engineering team.
• Familiarity with the Fintech or Banking regulatory landscape.
• No visa sponsorship available with this position
• Why you should join SumUp
• 🌎 Opportunity to work with a truly global, multicultural team from our central Covent Garden location, wrapped in historic charm and modern flair. This involves an office-first setup
• 🌈 Commitment to Diversity and Inclusion: be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced
• 🚀 Enrolment onto our Virtual Stock Option programme: you will own a stake in SumUp's future success
• 🏖 Generous time off: enjoy 28 days of paid leave, plus bank holidays and special leaves
• 📚 A dedicated annual L&D budget for attending conferences and/or advancing your career through further education
• 🏥 Health matters: private health insurance, including optical and dental
• 🚗 Life made easier: salary-sacrifice commuter benefits via Gogeta
• 💼 Financial security: retirement scheme (SumUp matches 7% when you contribute 5%)
• 🛡 Peace of mind: life insurance from MetLife for 2× your salary
• 🌴 Break4me: 1-month sabbatical after 3 years of service
• 🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team
• About SumUp
• Be empowered to do more that matters.
• At SumUp, we're on a mission to empower small businesses across the globe by providing simple and affordable tools that allow them to thrive. Today, over 4 million businesses in 37 markets rely on SumUp as their financial partner to manage payments, finance and customer relationships.

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