Job
- Level
- Senior
- Job Field
- Back End
- Employment Type
- Full Time
- Contract Type
- Permanent employment
- Location
- Dusseldorf
- Working Model
- Onsite
Job Summary
In this role, you will develop robust backend systems to aggregate data sources within the SumUp ecosystem, define API contracts, and create automated workflows for sales teams.
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
- Dusseldorf
- Working Model
- Onsite
- Diversity
- Open for all genders
- English Only
- English only required
