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November 4, 2026
Senior Fullstack Engineer
Senior • On-site
16,300 - 27,200 PLN/yr
Kraków, Poland
Quick Facts
Role: Senior Fullstack Engineer
Focus: End-to-end backend development and system modernization, with occasional frontend work
Description
You’ll modernize and extend a production platform by designing and developing backend services and APIs, implementing solutions, deploying them, and monitoring ongoing performance. You’ll work with databases, integrations, distributed systems, and AWS services, making decisions about reliability, security, observability, and cost. When needed, you’ll also handle frontend changes at the frontend–backend boundary using TypeScript and Preact.
Requirements
Strong backend fundamentals and experience with production systems
Ability to take a problem from analysis to a working solution independently
Solid experience with APIs, integrations, databases, and system architecture
Practical cloud experience (preferably AWS)
Ability to take ownership of an existing system and evolve it based on its constraints
Comfort making changes beyond backend, including frontend updates
Ability to discuss trade-offs (time, quality, risk, costs, product impact)
Clear communication of risks, dependencies, and consequences
Constructive mindset to challenge solutions and propose better alternatives
Interest in technology and ability to learn new areas effectively
Benefits
Opportunity to lead problems end-to-end: from understanding needs to implementation, deployment, observation, and further development
Work on AWS migration and modern backend services, using Go (production) and TypeScript/Preact on the frontend
AI-assisted engineering in day-to-day work, with responsibility for end results
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