Build real products that help millions of small businesses thrive.
At SumUp, we build fintech tools that empower over 4 million merchants across 37 markets to run and grow their businesses. The Warsaw Accelerator Program puts you at the heart of that mission - working on real product challenges in the Sell Online domain, from reducing merchant onboarding friction to building AI-powered tools that save merchants time and drive revenue.
This isn't a traditional internship. From day one, you'll join a small product team, take real ownership of a problem, and ship a working MVP alongside experienced engineers and product mentors. The top three performers will be offered a one-year contract at the end of the programme.
📍 Location: Warsaw, Hala Koszyki (office-first)
⏱ Duration: 3 months, 15th July – 15th October 2026 (full time)
💰 Salary: 8,000 PLN gross per month (Civil Law Contract / Umowa Zlecenie)
Curious what that actually looks like? Watch how our Accelerator participants become contributors to real-world features at SumUp.
What you'll work onYou'll join one of two teams tackling real merchant problems, including:
- Reducing onboarding friction by automating merchant setup and data import
- Building smart waitlist and re-engagement tools to help merchants fill gaps and grow revenue
- Exploring a consumer-facing marketplace where customers can discover and book services from SumUp merchants
- Developing AI-powered tools - including a voice-based AI receptionist and a conversational merchant assistant
Working alongside engineering mentors, product leads, and experienced SumUppers, you'll:
- Design, build, and ship a functional MVP addressing a real merchant problem - from backend APIs to user-facing features
- Write clean, testable, well-documented code and take part in code reviews from day one
- Work in weekly sprint cycles, demoing progress every Friday and iterating fast
- Grow your skills in Kotlin and TypeScript through a hands-on bootcamp in week one, then apply them immediately
- Present your team's solution on Demo Day to senior engineers and stakeholders across SumUp
- Are a final-year student or recent graduate in Computer Science, Software Engineering, or a related field
- Have built at least one full-stack application - through studies, a personal project, or freelance work
- Are familiar with Git and collaborative workflows such as branching, pull requests, and code review
- Have hands-on experience with at least one modern language - Java, Kotlin, Go, Python TypeScript preferred
- Are curious, self-driven, and learn fast - personal projects, open-source contributions, or online courses are a great signal
- Are fluent in English, as all programme communication is conducted in English
- Impact with Purpose - Ship products used by millions of small businesses while building next-gen AI tools. This isn't a sandbox.
- Come As You Are - A workplace that celebrates diversity and fosters an inclusion-first culture.
- Office Perks - Complimentary lunch every Thursday.
- Team Culture - Regular social events to connect and unwind.
Be empowered to build things that matter.
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 37 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 and culture shape everything we do, fostering inclusion, learning and belonging.
SumUp is proud to be an Equal Employment Opportunity employer, committed to building a safe, respectful, and diverse workplace where everyone can thrive.
Discover more about our culture and opportunities on our careers website, and follow our journey on LinkedIn, and Instagram.
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
- Final-year student or recent graduate in Computer Science, Software Engineering, or related field
- Experience building at least one full-stack application
- Familiarity with Git and collaborative workflows
- Hands-on experience with modern programming languages (Java, Kotlin, Go, Python, TypeScript)
- Fluency in English for program communication
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.
-
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.
-
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.
-
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!
Gallery
