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Senior Backend Engineer
Identity Lifecycle
Location
Berlin, Germany
Work type
Onsite
Employment
Full Time
Experience
5+ years
Compensation
Compensation not disclosed
Posted
1h ago
Summary and responsibilities
Role overview
Summary
As a Senior Backend Engineer at SumUp, you will design, build, and operate scalable backend services, APIs, and event-driven workflows, focusing on merchant onboarding, identity verification, and KYC/KYB regulatory data collection. You will work with Go and Java, modernising existing services, and drive reliability and resilience across critical systems.
You’ll join one of the teams within SumUp’s Identity Lifecycle Mission, working on some of the most critical building blocks behind the merchant journey, from onboarding and identity verification to KYC/KYB, regulatory data collection, and managing customer identity throughout the entire lifecycle.
Today, many of these capabilities live across different flows, legacy services, and tightly coupled integrations. We’re on a journey to bring these pieces together into a more coherent, scalable platform, with shared data models, reusable services, and clear ownership boundaries.
As a Senior Backend Engineer, you won’t just be maintaining existing systems. You’ll have the opportunity to shape how our identity platform evolves, modernise critical services, and help build foundations that can support new regulations, markets, and product requirements without reinventing the wheel every time.
You’ll be part of one dedicated team, but the challenges we tackle often cross team and domain boundaries. You’ll work closely with Engineers, Product, Design, Compliance, Risk, and Operations, giving you the opportunity to influence solutions well beyond your own team.
If you enjoy solving complex backend problems, working in a highly collaborative environment, improving reliability, and building scalable capabilities that enable other teams to move faster, this could be an exciting opportunity to make a real impact at SumUp.
What you’ll do:
Design, build, and operate scalable backend services, APIs, event-driven workflows, and system integrations.
Build reusable capabilities that power merchant onboarding, identity verification, and KYC/KYB regulatory data collection.
Drive reliability and resilience across critical services through better observability, failure handling, incident response, and long-term risk reduction.
Work primarily with Go, while maintaining and progressively modernising existing services written in Java.
Evolve domain models and service boundaries while reducing legacy complexity, duplicated logic, and tightly coupled integrations, always with a pragmatic, incremental mindset.
Own your work end-to-end, from technical design and implementation to rollout and production follow-up.
Work across team and domain boundaries, turning ambiguous product and regulatory requirements into clear, scalable technical solutions.
Review code and designs, mentor engineers, and help raise engineering standards across the mission.
You’ll be great for this role if you have:
Strong professional experience building and operating production backend systems with high business impact.
Experience working with Go and Java and confidence in maintaining and evolving existing Java services.
Strong knowledge of API design, distributed systems, asynchronous processing, data modelling, testing, and system design.
Experience with event streaming platforms such as Kafka and modern observability tools such as Grafana or Honeycomb.
Experience deploying and operating services in cloud environments such as AWS, ideally with Docker and Kubernetes.
A strong ownership mindset, with the ability to take complex problems from definition through to production.
Experience improving the reliability of business-critical systems and turning recurring incidents into lasting engineering improvements.
Strong communication skills and a collaborative approach to working across Engineering, Product, Compliance, Risk, and Operations.
Nice to have:
Experience in fintech, payments, KYC/KYB, identity verification, or regulatory systems.
Experience translating regulatory and compliance requirements into clear, scalable engineering solutions, while helping bridge the gap between Compliance and Engineering.
Updated 1h ago
Candidate fit
Skills and qualifications
Additional skills
Experience
5+ years
How this role is positioned
Role classification
Job domains
Industries
Employment
Full Time
Contract duration
Permanent
Hiring type
Direct
Global hiring
Location specific
Offer details
Compensation and benefits
Compensation
Compensation not disclosed
Benefits and perks
Location, schedule, and role shape
Work setup
Work conditions
Bandwidth profile
Context on the employer
Company snapshot
Company
SumUp
Team size
Growing team
Location
Berlin, Germany
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 36 markets rely on SumUp as their financial partner to manage payments, finance and customer relationships.
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Senior Backend Engineer
Berlin, Germany • Full Time