Senior Backend Engineer Cologne, Germany

At Sum Up, we're on a mission to bring merchants and consumers closer together and help local communities thrive. With Sum Up Pay, we're building a rewarding banking experience that connects people to the small businesses they love while enabling free transactions for our merchants.

Sum Up Pay helps consumers manage their money with ease and get more from everyday spending. It offers seamless payment experiences and financial tools designed for modern life, supporting the growth of a thriving consumer banking ecosystem.

This is a high-impact technical position where you'll build and scale backend services for our neobanking platform. You will develop banking features while ensuring the highest standards of security, compliance, and availability. Working in a fast-paced environment, you'll collaborate closely with mobile engineers, product managers, and cross-tribe stakeholders to deliver seamless banking experiences to our customers.

Develop and maintain backend services for neobanking features across our consumer banking platform

Build highly available, scalable systems deployed on AWS with container orchestration (Docker, Kubernetes) using Go, Kotlin, or Python

Collaborate with mobile engineers (iOS and Android) to deliver seamless banking experiences and ensure smooth integration between backend and frontend

Work on banking infrastructure improvements and migrations while maintaining system stability and customer experience

Contribute to technical designs and architecture decisions for consumer banking products, balancing feature delivery with infrastructure improvements

Integrate with external banking systems and payment providers while ensuring compliance with regulatory requirements and security standards

Participate in code reviews and maintain high engineering standards across the codebase

Work closely with the Product Manager, Designer, and Engineering Manager to deliver on quarterly OKRs and roadmap priorities

You have 3-5+ years of backend software development experience, with a proven track record of building and maintaining production systems

You possess strong proficiency in at least one modern backend language, preferably Go

You have solid experience with cloud platforms (AWS or comparable) and container orchestration (Docker, Kubernetes)

You possess strong SQL skills and solid understanding of databases (SQL and No

SQL), with experience building highly available, scalable backend services

You bring strong problem-solving and debugging skills, with the ability to navigate complex technical challenges

You're self-driven, proactive, and bring a product-oriented mindset with a quality-focused approach

You have experience working in agile, cross-functional teams and collaborating effectively with mobile engineers and product stakeholders

You're adaptable to changing priorities and comfortable with ambiguity in a fast-paced, startup-like environment

Experience in payments and financial services or fintech environments

Experience with microservices architecture and event-driven systems

Opportunity to work in a truly global, multicultural team from our open, vibrant Cologne office, located in the heart of the city. This involves an office-first setup

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

Enrolment onto our Virtual Stock Option programme: you will own a stake in Sum Up’s future success

Generous time off: enjoy 28 days of paid leave plus public holidays and special leave days

Commute made easy: subsidised mobility options like discounted transport tickets or bike leasing

Stay active:

access to fitness via Urban Sports Club, mostly covered by Sum Up

Financial health: a corporate pension scheme with Sum Up contributing an extra 20% on top of your contribution

Employee perks: get discounts across products and services via our Corporate Benefits platform

Break4me: 1-month sabbatical after 3 years of service

Referral Bonus: earn additional rewards by referring talented individuals to…