🚀 SumUp Accelerator – Fullstack Engineering Intern
About this role
🚀 SumUp Accelerator – Fullstack Engineering Intern
Build AI-powered products that impact millions of small businesses.
At SumUp, we build fintech solutions that empower over 4 million merchants across 37 markets to run and grow their businesses. Every day, this generates rich payments and business data, and SumUp's next-gen AI tools turn that data into practical insights and intelligent tools that create real merchant value.
This is not a traditional internship. From day one, you'll join a product squad, contribute to shared codebases, and ship production code used by merchants every day.
📍 Location: Central London
🕒 Duration: 3 months, starting 15th June (full time)
🎯Starting Salary: £32,500
👉 Curious what that actually looks like? Watch how our Accelerator participants become contributors to real-world features at SumUp.
What You'll Work On
You'll contribute to greenfield products, significant internal tools, and groundbreaking new technologies being integrated into the SumUp ecosystem — with a focus on:
Backend & Fullstack engineering (APIs, services, dashboards)
AI-enabled backend systems and data pipelines
User-facing services and UI/UX
Your Impact
Working alongside experienced engineers, data scientists, and product managers, you will:
Build end-to-end product features for SumUp's AI Initiative, from backend APIs and data pipelines to user-facing services
Integrate with core SumUp systems, databases, and internal tooling
Write clean, testable, well-documented code following team standards
Participate fully in team rituals: planning, technical discussions, code reviews, and knowledge-sharing sessions
Take ownership, iterate quickly on ideas and prototypes, and learn by shipping real features
You Might Be a Great Fit If You…
Are a recent graduate (Bachelor's or Master's), final year student, or early-career professional (0–2 years' experience) in Computer Science, Software Engineering, or a related field
Understand data structures, algorithms, and object-oriented programming
Have hands-on experience with at least one modern language, Python, Go, Java, Kotlin, or JavaScript preferred
Are familiar with Git and collaborative workflows (branches, pull requests)
Understand client-server architecture and HTTP fundamentals
Can write simple SQL queries and understand how data is structured and accessed
Are curious about AI, data, and how technology creates real merchant value
Learn fast, welcome feedback, and enjoy working in collaborative cross-functional teams
Why Join SumUp?
🌎 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 breakfast every Wednesday and lunch on Thursdays.
🎉 Team Culture — Regular social events to connect and unwind.
Responsibilities
- Backend & Fullstack engineering (APIs, services, dashboards)
- AI-enabled backend systems and data pipelines
- User-facing services and UI/UX
- Build end-to-end product features for SumUp's AI Initiative, from backend APIs and data pipelines to user-facing services
- Integrate with core SumUp systems, databases, and internal tooling
- Write clean, testable, well-documented code following team standards
- Participate fully in team rituals: planning, technical discussions, code reviews, and knowledge-sharing sessions
- Take ownership, iterate quickly on ideas and prototypes, and learn by shipping real features
Requirements
- Are a recent graduate (Bachelor's or Master's), final year student, or early-career professional (0–2 years' experience) in Computer Science, Software Engineering, or a related field
- Understand data structures, algorithms, and object-oriented programming
- Have hands-on experience with at least one modern language, Python, Go, Java, Kotlin, or JavaScript preferred
- Are familiar with Git and collaborative workflows (branches, pull requests)
- Understand client-server architecture and HTTP fundamentals
- Can write simple SQL queries and understand how data is structured and accessed
- Are curious about AI, data, and how technology creates real merchant value
- Learn fast, welcome feedback, and enjoy working in collaborative cross-functional teams
About SumUp
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.