The Localization team builds and owns the systems that make sure every merchant, in every one of our 38 markets, can understand and use our products in their own language. It's one of the most critical enablers of SumUp's global growth, sitting at the heart of how fast and how well we can go to market anywhere in the world.
As our Senior Full Stack Engineer, you'll bring dedicated engineering ownership by working closely with the team to scope, build and ship the systems, integrations and tooling accelerate the ongoing evolution of our localization platform towards greater automation, scalability and end-to-end integration. If you want autonomy, meaningful scope, and the chance to shape a growing function, this is the role.
What you'll do:
- Design, build and optimise localization solutions across product, CMS, CRM, marketing and design systems, so content moves faster without compromising quality
- Improve the localization management platform to give the team greater visibility and control while reducing manual steps
- Embed automated language and quality checks into several steps of the localization workflows, catching issues before they reach production
- Improve the experience for developers, designers, marketers and content teams by ensuring localization solutions support their processes and ways of working
- Partner with Web and Mobile, Website, Comms Platform and other technical teams to enable localization capabilities across the technology stack
- Explore how AI and language technology can strengthen and future-proof the localization stack, while ensuring solutions meet evolving compliance requirements.
You'll be great for this role if:
- Strong background in backend engineering, ideally with Go (alternatively knowledge with Python, Rust or C++)
- Experience building and maintaining RESTful APIs in a microservices or distributed systems environment
- Working knowledge of databases such as PostgreSQL and event streaming tools such as Kafka
- Comfort translating priorities from non technical stakeholders into scoped, shippable engineering work
- Ability to operate independently across a fragmented, distributed system landscape, working within architecture owned by other teams
- Exposure to frontend frameworks such as Reactjs and languages like Typescript
- Experience working with translation management systems (TMS), or with the localization of web or mobile applications and other content platforms.
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
🌈 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 SumUp's future success
📚 A dedicated annual L&D budget of €2000 for your individual development, which can be used to attend conferences and/or advance your career through further education
💶 A corporate pension scheme where we match up to 20% of your contributions
🏖 Generous time off: enjoy 28 days of paid leave plus public holidays and special leave days
🎁 Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, subsidised office lunches
🌴 Break4me: 1-month sabbatical after 3 years of service🔗 Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team
About SumUp
Be empowered to do more that matters.
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 38 markets rely on SumUp as their financial partner to manage payments, finance and customer relationships.
Our commitment to small businesses is reflected in our diverse team of over 3,000 SumUppers from over 90 nationalities, united by global collaboration and an innovative mindset. Our core values lay the foundation for who we are and what we stand for, shaping our work culture and driving our success. We foster inclusivity and a continuous learning culture, providing a safe space for personal and professional growth. Our differences make us unique and strong as we strive to create an environment where everyone belongs and feels supported, no matter how they identify.
SumUp is proud to be an Equal Employment Opportunity employer, actively seeking and embracing diversity in our workforce. We don't make hiring or employment decisions based on race, colour, religion or religious belief, ethnic or national origin, nationality, sex, gender, gender identity, sexual orientation, disability, age or any other basis protected by applicable laws or prohibited by company policy. Our commitment extends beyond recruitment to creating a safe and respectful workplace where harassment of any form is strictly prohibited. Discover more about our culture and opportunities on our careers website, and follow our journey on LinkedIn, Instagram, and TikTok.
Berlin office
Job Application Tip
We recognise that candidates feel they need to meet 100% of the job criteria in order to apply for a job. Please note that this is only a guide. If you don’t tick every box, it’s ok too because it means you have room to learn and develop your career at SumUp.
Skills Required
- Strong background in backend engineering
- Strong knowledge of Go, or alternatively Python, Rust, or C++
- Experience building and maintaining RESTful APIs
- Experience working in microservices or distributed systems environments
- Working knowledge of PostgreSQL or similar databases
- Working knowledge of event streaming tools such as Kafka
- Ability to translate nontechnical stakeholder priorities into scoped, shippable engineering work
- Ability to work independently across fragmented and distributed system landscapes
- Exposure to frontend frameworks such as React.js and TypeScript
- Experience with translation management systems or localization of web, mobile, and content platforms
SumUp Compensation & Benefits Highlights
The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about SumUp and has not been reviewed or approved by SumUp.
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Leave & Time Off Breadth — Paid time off is positioned as a standout, including 22 vacation days that increase with tenure, public holidays, a quarterly Wellness Day, special leave, and a fully paid one‑month sabbatical after three years. This combination makes time-off benefits feel notably robust in the overall rewards package.
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Healthcare Strength — Health coverage is described as comprehensive, with medical plan options (including carriers such as Cigna and Kaiser) plus dental and vision. Company-paid life insurance and disability coverage are also part of the protection package in the U.S. materials.
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Retirement Support — Retirement benefits include a published 401(k) match formula that provides an employer match up to a stated cap. The clarity of the match structure supports straightforward evaluation during offer comparisons.
SumUp Insights
What We Do
SumUp believes that every business should have access to affordable, easy-to-use financial solutions, no matter their size. That’s why more than 3 million businesses worldwide rely on SumUp to run their business. What started out as one card reader has now turned into a range of payment hardware, banking solutions, marketing, and loyalty tools, invoicing, and so much more. From sales and marketing to product and engineering, our cross-functional US team works together to ensure that small business owners can be successful doing what they love.
Why Work With Us
SumUp USA is part of the global SumUp organization that stretches across multiple continents from Berlin to Sao Paulo. Our teams are multicultural, have a collaborative mindset and bold goals. Join our mission if you want to become part of the success story and help empower over 3 million merchants using SumUp already!
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