Senior Software Engineer

| Greater Boulder Area
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We're looking for a Senior Software Engineer to join our growing US engineering team.

At SumUp, small business owners are at the heart of everything we do. That’s why we create powerful, easy-to-use financial solutions to help them run their businesses. With merchants in over 31 countries using SumUp to accept payments, we’re building the first-ever global card acceptance brand. Using a founder’s mentality and a “team-first” attitude, our teams across Europe, South America and the United States work together to ensure that small business owners can be successful doing what they love.


Our goal is to make SumUp the #1 way for small businesses to accept payments in the US. As a Senior Software Engineer on the US engineering team, you will be part of growing a new engineering organization from the very early stages. This is a highly collaborative role, and the ideal candidate will be able to work closely with a wide variety of stakeholders, technical and non-technical, across several teams (and timezones).

SumUp is committed to fair and equitable compensation practices. The salary range for this position in Boulder, CO is $130,000 to $180,000.  Compensation will be finalized by candidate’s relevant work experience, skills, certifications and geographic location.

This position is remote-optional, but we're mostly colocated in the Boulder office and offer a generous relocation to beautiful Colorado. We can only hire US Residents at this time.

Here's how you'll fit into our US Engineering team:

  • We work with teams across the engineering and product organization at SumUp. We have a few areas that we spend the most time in: US Merchant Experience, US Core Payments Infrastructure, New Market Expansion, and US Loonshots (big bets). That means you could be working on launching a new country one month, and building new core payments features the next. We like to hire generalists, and then find the best place for you over time. We also prioritize learning new skills, so you'll get the chance to work on lots of different projects if you want to.
  • We work with a light project management structure: kanban, a weekly engineering meeting, daily stand-ups. Everyone is empowered to decide what to work on to create the biggest impact, and they're also responsible for getting feedback from users, testing, and monitoring once it's live.

Things we value most in our Senior Software Engineers:

  • Clean, maintainable, peer-reviewed code. Other engineers should use your work as a standard for excellence.
  • Help with hiring, coaching and mentoring other engineers.
  • Ability to guide the development, deployment, and maintenance of small, focused services within a distributed architecture.
  • Ability to work directly with Product Managers, Engineering Managers, and others across different tribes and squads.
  • Taking ownership of legacy services which have outlasted their original implementations, through refactoring, migration, and rethinking of architectural design.
  • Making our engineers and engineering systems more effective with processes that allow us to ship quicker, fail faster, and isolate the blast radius of changes.

You have:

  • A curious, passionate, and growth-oriented mindset about technology
  • Led impactful engineering projects at a non-trivial scale
  • A desire to teach, improve, and multiply the strengths of engineers around you
  • Experience working with one or more of: Ruby, Golang, Elixir/Erlang
  • Experience with micro-service based architecture
  • 5+ years experience contributing to and leading engineering projects

Bonus points for:

  • Familiarity with React and/or Rails
  • Experience building and deploying to cloud infrastructure

Some of our technology:

  • Erlang/Elixir, Phoenix
  • Ruby, Rails
  • Golang
  • Postgres
  • Kubernetes
Why you should join SumUp:
  • Be part of a welcoming community of more than 2,000 people from over 52 nationalities (we're a big startup!)
  • Over 30 days of paid vacation and holidays
  • Meaningful equity in a fast-growing fintech unicorn (Virtual Shares Program with an internal marketplace)
  • Medical, Dental, Vision Insurance and company-paid life insurance
  • Employer paid long-term disability
  • 401K Retirement Plan (up to 3.5% employer matching when you elect to contribute up to 6%)
  • $2300 per engineer per year for education and training (books, courses, conferences, etc.)
  • 100% paid parental leave (up to 8 weeks) 
  • 1 month paid sabbatical for every three years you're with SumUp
  • Company-paid team off-sites -- this year it's a week in Berlin!
  • Free on-site refreshments, snacks, and drinks in our beautiful Boulder office
  • Fun company outings, team events, birthday lunches, weekly breakfast, yoga, happy hours, hikes, etc.

SumUp encourages you to apply even if you don’t meet all requirements for the position.  SumUp believes in supporting candidates and employees throughout their career journey so we encourage you to apply.  SumUp is committed to a diverse, equitable and inclusive workplace.

About SumUp

We believe in the everyday hero.

Small business owners are at the heart of all we do, so we create powerful, easy-to-use financial solutions to help them run their businesses. With a founder’s mentality and a 'team-first’ attitude, our diverse teams across Europe, South America and the United States work together to ensure that the small business owners we partner with can be successful doing what they love. 

SumUp is an Equal Employment Opportunity employer that proudly pursues and hires a diverse workforce. SumUp does not make hiring or employment decisions on the basis of 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. SumUp also strives for a healthy and safe workplace and strictly prohibits harassment of any kind.

SumUp will not accept unsolicited resumes from any source other than directly from a candidate.



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SumUp is located on Pearl Street in downtown Boulder with beautiful views of the Flatirons and access to restaurants, bars and public transport.

An Insider's view of SumUp

What’s the vibe like in the office?

Our SumUp Boulder office is full of collaboration! We work in an open environment and our team is cross-functional. SumUp is constantly growing and while being on this amazing journey we just enjoy learning from each other!


Head of US Customer Support

How has your career grown since starting at the company?

SumUp USA is still small, so all the team members have a founder's mentality. We interpret this as the ability to be self-driven, think pragmatic, and do more with less. I have put lots of work into growing our business, and as our company grows, so does my team and my responsibilities!


Head of Performance Marketing

How do you make yourself accessible to the rest of the team?

Everyone is always welcome to approach me. We work in an open office with an open door policy and team members can always come to me with ideas and feedback.
Also, we discuss new initiatives and celebrate successes during the weekly all hands.


Managing Director

What are SumUp Perks + Benefits

SumUp Benefits Overview

SumUp is located on Pearl Street in downtown Boulder. Beyond the beautiful views of the Flatirons from our office we offer:

- Health, dental, vision and life insurance
- FSA & 401k retirement plans
- Immediately available PTO
- Startup vibes + cross-functional teams
- Weekly team events and milestone celebrations
- A rotating selection of free beer
- Free EcoPass for public transport all around Colorado
- One Outdoor/Powder Day a year! This is why we work in Boulder right?

Friends outside of work
Eat lunch together
Open door policy
Team owned deliverables
Team based strategic planning
Group brainstorming sessions
Open office floor plan
Health Insurance & Wellness Benefits
Flexible Spending Account (FSA)
Dental Benefits
Vision Benefits
Health Insurance Benefits
Life Insurance
Wellness Programs
Retirement & Stock Options Benefits
401(K) Matching
Vacation & Time Off Benefits
Generous PTO
Paid Holidays
Paid Sick Days
Perks & Discounts
Beer on Tap
Casual Dress
Commuter Benefits
Free Bus Pass
Stocked Kitchen
Some Meals Provided
Fitness Subsidies
Professional Development Benefits
Job Training & Conferences
Cross functional training encouraged
Promote from within
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