Senior Backend Engineer

Salary: £40,000 - 80,000 per year

Requirements:

• Strong proficiency in Go, Kotlin, or Python, with a track record of building scalable, production-grade backend services
• Experience working with cloud platforms such as AWS or comparable services 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, such as 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
• Previous experience in a growth-focused engineering team is a plus
• Familiarity with the fintech or banking regulatory landscape is a plus
• No visa sponsorship available with this position

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 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 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

Technologies:

• AWS
• Backend
• Cloud
• Docker
• Support
• Kotlin
• Kubernetes
• NoSQL
• Python
• SQL
• Security
• DevOps

More:

We are SumUp, and were on a mission to bring merchants and consumers closer together and help local communities thrive. Within our Consumer Mission, we are building a rewarding banking experience that connects people to the small businesses they love while tackling technically demanding challenges in fintech, including critical infrastructure migrations, uninterrupted payment experiences, seamless open banking integrations, and high-availability banking systems. This role sits at the heart of that work, giving you real ownership of backend services close to our consumers and visible impact across the platform. We offer a global, multicultural team from our central London Bridge location with an office-first setup, commitment to diversity and inclusion, virtual stock options, 28 days of paid leave plus bank holidays and special leave, an annual learning and development budget, private health insurance, commuter benefits, retirement scheme matching, life insurance, a sabbatical after three years, and a referral bonus. We support over 4 million businesses in 37 markets with a team of more than 3,000 people from over 90 nationalities, and we foster inclusivity, continuous learning, and a safe, respectful workplace where everyone belongs.

last updated 37 week of 2026