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Senior Backend Engineer
Location
Cologne, North Rhine-Westphalia, Germany
Work type
Onsite
Employment
Full Time
Experience
5-8 years
Compensation
Compensation not disclosed
Posted
4d ago
Summary and responsibilities
Role overview
Summary
The Senior Backend Engineer will design, build, and operate production-grade backend services, APIs, and integrations, primarily using Go. This role involves building event-driven workflows and distributed systems, defining clear service boundaries, and owning technical work end-to-end from design to deployment. The engineer will also modernize existing services, improve reliability, and collaborate with various teams to deliver scalable solutions for merchant acquisition, identity, marketing technology, operations, risk, and compliance.
What you’ll do:
Design, build, and operate production-grade backend services, APIs, and integrations, primarily using Go.
Build event-driven workflows and distributed systems using technologies such as Kafka and asynchronous processing.
Define clear service boundaries, data models, schemas, and API contracts that other teams can use confidently.
Build capabilities supporting merchant acquisition, identity, marketing technology, operations, risk, and compliance.
Own technical work end to end, from discovery and system design through implementation, testing, deployment, and production follow-up.
Modernise existing services and improve reliability through observability, security, failure handling, and incident response.
Collaborate with Product, Data, Operations, Compliance, Risk, Sales, Marketing, and other engineering teams to turn complex requirements into practical solutions.
Review code and designs, make pragmatic technical trade-offs, share knowledge, and mentor engineers around you.
You’ll be great for this role if you:
Bring a strong backend engineering background in Go, or are a typed-language generalist ready to ramp up quickly.
Have designed APIs and distributed systems with clear contracts, versioning, and integration patterns.
Are fluent in relational and analytical databases (PostgreSQL, Snowflake) and comfortable making the right choice for the right use case.
Have built Kafka-based, event-driven systems and understand event sourcing and CDC patterns.
Have experience in auditable, high-trust systems where every decision must be traceable fintech, payments, or similar domains.
Have experience with testing, observability, and incident response practices and treat them as first-class concerns, not afterthoughts.
Take ownership of ambiguous problems and turn them into clear, scalable, and maintainable solutions.
Communicate clearly, collaborate effectively, and explain technical concepts and trade-offs to different audiences.
Value pragmatic engineering, continuous improvement, mentoring, and reliable production operations.
Why you should join SumUp:
Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Berlin office. This involves an office-first setup.
We take learning and experimentation seriously with Hack Days every second Friday, and entire global Hack Weeks.
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.
A dedicated annual L&D budget of €2,000 for attending conferences and/or advancing your career through further education.
Enrolment onto our VSOP program: You will own a stake in SumUp’s future success.
A corporate pension scheme where we match up to 20% of your contributions.
30 Days Sabbatical: Enjoy the unique opportunity to take a well-deserved break with our 30 days sabbatical benefit after completing 3 years of employment with SumUp.
Referral Bonus: Earn additional rewards by referring talented individuals to join the SumUp team.
Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, relocation assistance, subsidised office lunches.
Updated 4d ago
Candidate fit
Skills and qualifications
Additional skills
Experience
5-8 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
Cologne, North Rhine-Westphalia, 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. Our diverse team of over 3,000 SumUppers from over 90 nationalities is united by global collaboration and an innovative mindset, fostering inclusivity and a continuous learning culture.
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Senior Backend Engineer
Cologne, North Rhine-Westphalia, Germany • Full Time