Senior Software Engineer

Sumup; Florianópolis; On-site; BRL 300,000 - 450,000; Full time

Benefits offered by this job

Global, multicultural team

Stock option enrolment

L&D budget 10,000 BRL

22 days paid leave

Wellhub gym membership

Retirement plan with Santander

Zenklub access

Job summary

SumUp is looking for a Senior Backend Engineer to join the Lending team in Florianópolis. You will anchor live systems, own Go services, and balance speed with stability while navigating regulatory demands across Europe and Brazil.

Expect to boost observability, improve reliability with tests, and help scale a high-stakes platform in a global, office-first environment. Must thrive on complex, live systems and trade-offs.

Qualifications

• Backend development with a Go focus and high quality code.
• Experience improving existing live systems and performance.
• Familiar with observability tools and metrics.
• Proven ability to write integration tests for reliability.
• Ability to balance speed with long-term stability and regulatory needs.

Responsibilities

• Build and maintain backend services powering the lending platform in Go.
• Strengthen observability and monitoring to measure health and detect issues.
• Write integration tests to protect every release.
• Adapt platform to new regulatory requirements in new markets.
• Contribute to new loan repayment flows.
• Investigate incidents, balancing quick fixes with stability.

Skills

Go backend

Observability

Integration Tests

Reliability

Regulatory

Incident handling

Job description

At SumUp, we believe small merchants are the heartbeat of our communities. By joining the Lending team, you'll help keep a core credit product running for businesses across Europe and Brazil, one that's already proven, already trusted, and still has plenty of room to get better.

As a Senior Backend Engineer, you'll be a technical anchor on the Servicing squad, operating with real autonomy to challenge existing patterns rather than just maintain them. This is a role for someone who's energised by complex, live systems, comfortable owning hard trade offs between speed and stability, and excited to help scale a regulated, high stakes platform without breaking what already works.

What you'll do

• Build and maintain backend services that power SumUp's lending platform in Go
• Strengthen observability and monitoring so the team can measure system health and catch issues before they become incidents
• Write integration tests that protect the reliability of every release
• Help adapt the platform to new regulatory requirements as SumUp expands into new markets
• Contribute to exploring and implementing new loan repayment flows
• Investigate production incidents and balance fast fixes with long term platform stability

You'll be great for this role if

• Strong knowledge of backend development, with a clear focus on code quality and performance.
• Experience questioning how an existing system works and proposing concrete, practical improvements.
• Comfort working with observability and monitoring tools to understand system behaviour and define meaningful metrics.
• Track record of using integration tests to validate the reliability of a service.
• Ability to weigh deadlines against quality when building or evolving a production system, and to explain that trade off clearly.

Why you should join SumUp

• Opportunity to work with a truly global, multicultural team from our dynamic São Paulo hub in the heart of the city. 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 R$ 10,000 for education, certifications, and conferences
• Generous time off: enjoy 22 working days of paid leave, plus public holidays and special leave days
• Stay fit: Wellhub membership included and gym at the office
• Financial wellness: SumUp contributes to your private retirement plan with Santander
• Mental well-being: access to Zenklub for therapy, coaching, and emotional wellness resources

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 39 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 4,000 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.

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.