Senior Backend Engineer - Identity Lifecycle

SumUp, Berlin, Germany +1

The team

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.

What you will do

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.

Senior Backend Engineer - Identity Lifecycle

The team

Senior Backend Engineer - Identity Lifecycle

The team

What you will do

What you’ll do

You’ll be great for this role if you have

Nice to have

Why you should join SumUp

Job Application Tip

About SumUp

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