About Szymon
I help startups and product teams build and scale SaaS products and web applications using Ruby on Rails, Vue.js, React and TypeScript.
If you need a developer who can take a feature from idea to production, design solid backend architecture, and deliver a maintainable frontend experience, I can help you move fast without sacrificing quality.
I specialize in building scalable SaaS platforms, APIs, and internal tools, as well as modernizing and improving existing Ruby on Rails applications.
What I typically deliver:
- Full-stack SaaS applications (MVPs and production systems)
- Backend architecture design and REST APIs
- Frontend applications built with Vue.js
- Payment systems and integrations (e.g. Stripe, third-party APIs, authentication)
- Refactoring and scaling of existing Rails applications
What makes me different:
I focus on product outcomes, not just code delivery. I think in terms of system design, scalability, and user impact, and I take ownership of features end-to-end in fast-moving environments.
Polish
Native or bilingual
English
Fluent
French
Basic
Remote only
Primarily works remotely
Experience
- j-labs sp. z o.o.Senior Software EngineerDIGITAL AND ITDecember 2024 - April 2026 (1 year and 4 months)Krakow, PolandWorked on an enterprise-grade SaaS platform for sales engagement and revenue operations, serving 200K+ users across global enterprise clients.
- Maintained and stabilized complex legacy systems in a high-traffic production environment, improving reliability through targeted refactoring and proactive incident response.
- Diagnosed and resolved production incidents, ensuring platform stability for Fortune 500 enterprise clients.
- Designed and shipped new product features end-to-end in a cross-functional Agile team, from technical design through production deployment.
- Railwaymen sp. z o.o.Senior Software EngineerDIGITAL AND ITJune 2018 - November 2024 (6 years and 5 months)Krakow, PolandDelivered full-stack SaaS solutions for clients across fintech, healthcare, education, food, and construction sectors.
- Led a team of 5 engineers building a cloud-based platform for daily collection, processing, and management of financial data — owning architecture decisions, code reviews, and delivery cadence.
- Collaborated directly with partners and clients to define technical architectures, translating business requirements into scalable solutions.
- Elevated team code quality through mentoring, pair programming, and establishing testing standards covering unit, integration, and E2E layers.
- Drove migration and modernization efforts on legacy systems, improving stability and reducing technical debt across multiple client codebases.
- MNS Lab sp. z o.o.Junior Ruby on Rails DeveloperENVIRONMENTALNovember 2017 - April 2018 (5 months)Kraków, Poland
- Developed a REST API for an ecological application processing time-series data from renewable energy sources, ensuring reliable data availability
- Contributed to feature development and bug fixing under senior guidance, supporting continuous delivery
- Participated in code reviews, applying clean code practices to improve code quality and maintainability
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Education
- Master of Science (MSc)AGH University of Science and Technology2017Mechatronic Manufacturing
- Bachelor of Science (BSc)AGH University of Science and Technology2016Mechatronic Engineering