Senior Software Engineer I (Full Stack, Payments)

The ideal candidate will be able to

• Take extreme ownership: Own outcomes through to resolution when a feature breaks or a customer is stuck, regardless of where the problem sits in the stack.
• Navigate real complexity: Untangle large systems and solve high-stakes problems requiring creative thinking and persistence.
• Be a “whatever it takes” engineer: Step into frontend or infrastructure work when needed, learn quickly, and unblock the team.
• Treat AI as a teammate: Use AI tools daily to solve difficult problems while maintaining a high quality bar.
• Drive the team forward: Provide technical leadership, make sound decisions, and address technical debt before it becomes a roadblock.

What skill are we searching for?

• Real-world experience: At least 5–7 years building software for high-traffic production environments.
• Backend mastery: High proficiency in Golang; PHP experience is preferred.
• AI fluency: Experience integrating AI into the development workflow to write better code and debug complex systems.
• Solid fundamentals: Deep understanding of data structures, algorithms, and design patterns for building at scale.
• Strong communication: English proficiency at minimum B2 and readiness to collaborate in person at the Kraków or Gdańsk office 2–3 times per week.

Perfect candidate also has

• The “Figure it Out” gene: Enjoys tackling problems without obvious answers.
• Full-stack flexibility: Willingness to work with React or JavaScript when needed to deliver a project.
• Cloud and infrastructure comfort: Familiarity with AWS, Terraform, or Kubernetes and how code operates in production.
• Payment processing prowess: Experience with payment gateways, ledger systems, transaction routing, or PCI compliance; understanding of secure, reliable money movement.
• A mentoring mindset: Raises the bar through thoughtful code reviews and knowledge sharing.

Here’s a bit about what we have to offer

• Competitive pay: 19,500–24,400 PLN net on B2B.
• Training budget of 3,500 PLN gross per year.
• Access to e-learning platforms, including O’Reilly.
• Fully paid private healthcare in LuxMed.
• Access to the Worksmile platform with a monthly top-up.
• Subsidized breakfast and lunch through the vending machine in the Kraków office, plus lunch in the Gdańsk office once a week.
• Group English classes with a native speaker.
• New MacBook Pro, 4K monitors, or other tools needed for the role.
• Flexible working hours.
• Modern, bright, comfortable office space in the city centre.
• Access to the company library.
• Great working atmosphere.
• Chill-out room with a PlayStation and games.
• Free snacks and beverages in the kitchen.
• Company parties and social activities.
• Employee referral program.
• Relocation package within Poland.