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Senior Performance Engineer

Sofia, Bulgaria · Engineering

As the QA Platform squad, our goal is to enable the teams of SumUp to build quality into their products fast and efficiently by presenting them with a selection of well-documented guidelines, tested tools and workflows, while supporting them to seamlessly integrate these into their daily work.

Your role will be to strengthen the focus on performance by building tools, writing tests and supporting others with fixing issues or implementing improvements, related to performance of systems or individual components.


  • You will be working closely with Ops and Software engineers 

  • You will be analysing the performance capabilities of complex cloud-based systems and platforms

  • You will work with domain owners to identify and prioritise performance metrics

  • You will design and implement performance tests platform and scenarios

  • You will analyse test results and work together with developers and DevOps engineers to fix issues or implement improvements

  • You will do root cause analysis of performance issues and suggest corrective actions


  • You have good command of a high-level language such as Java/Go/JS/C#

  • You have deep understanding and work experience with Docker and Kubernetes

  • You are experienced in writing automated performance tests

  • You have experience working with JMeter, Gatlin or similar tools

  • You are capable of understanding and documenting cloud-based system architecture

  • You are strong communicator and capable of working with diverse teams

  • Background in SysOps/DevOps will be considered a great advantage

  • University degree in Computer Science/Information Technology will be considered a plus

  • You are fluent in English - you'll be part of a truly global company!


  • You’ll have the opportunity to put the foundations of next generation payment platform

  • You'll have the opportunity to make an impact as we work in flat hierarchies

  • You'll have the space to drive your career here and take ownership of projects

  • You’ll have the chance to work on a diverse and international team

  • You'll be able to attend global offsites/hackathons/team events

  • You'll have a competitive compensation and education budget

  • 25 days paid vacation + 1 accumulative day for each year of employment at SumUp

  • Additional health insurance

  • Multisport cards

  • Various discounts for SumUp employees

  • Attractive referral program

  • Transportation to/from the office building

  • Office relaxation activities such as yoga and massages

  • Innovative office design featuring an amazing 360’ Sofia view, a music room, events forum space, fully equipped kitchen facilities, and cozy meeting rooms


We believe in the everyday hero.

Small business owners are at the heart of all we do, so we're creating tools that help them run their business. With a founders 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, color, 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.