Job
- Level
- Senior
- Job Field
- Back End
- Employment Type
- Full Time
- Contract Type
- Permanent employment
- Location
- Cologne
- Working Model
- Onsite
Job Summary
In this role, you will develop data models and APIs to automate commissions, build a centralized Lifecycle Event Log, and establish best practices for testing and monitoring in the backend.
Job Technologies
Your role in the team
- Aggregating data from across the SumUp ecosystem to determine which acquisition channel or sales agent drove a merchant to take a valuable action (e.g., signing up, adopting a product).
- Establishing data models, API contracts, and rule definitions that automate existing manual commission workflows for field and tele-sales agents, partnerships, and merchant referrals.
- Build the Lifecycle Event Log in close collaboration with the Merchant Intelligence squad. A centralized store of curated merchant lifecycle events (signups, product usage, verification, purchases) used across attribution, recommendations, customer support and sales.
- Build internal backoffices and APIs for sales representatives and leaders to monitor commission and modify commission plans, manage portfolios and resolve disputes.
- Define and document API contracts, schemas, and integration patterns that other engineering teams can adopt confidently.
- Establish best practices for testing, observability, and incident response within a newly formed squad.
- Use AI and agentic coding tools deliberately, to scaffold services, write tests, explore unfamiliar code, and draft documentation while maintaining full accountability for what gets shipped.
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Our expectations of you
Qualifications
- 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 built services from scratch in greenfield, early-stage squads with limited prior context, and are energized, not unsettled, by that challenge.
- Are resourceful and adaptable, you take end-to-end ownership, do more with less, and adjust quickly as priorities shift.
- Can bridge technical and non-technical audiences, translating fuzzy problems into clear engineering work and explaining trade-offs to engineers and sales stakeholders alike.
- Are pragmatic, you know when good enough ships value and when something genuinely needs to be done properly.
- Have mentorship instincts, you raise the bar for the people around you, not just your own output.
Experience
- 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.
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What we offer
- 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.
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Benefits
Work-Life-Integration
Health, Fitness & Fun
Topics You Will Work On
Job Locations
About Your Employer
Sumup
Our mission as a global FinTech company is to build the world's first global card acceptance brand, empowering small businesses all over the world and helping them achieve their goals.
Description
- Language
- English
- Company Type
- Established Company
- Working Model
- Onsite
- Industry
- Internet, IT, Telecommunication
Senior Backend Engineer
- Location
- Cologne
- Working Model
- Onsite
- Diversity
- Open for all genders
- English Only
- English only required
