How to apply for Fullstack Developer (Poland)

About Chooose

Chooose builds software for the lower carbon fuel value chain, specifically sustainable aviation fuel (SAF) programs and carbon management. Its customers include Delta Air Lines, Cathay Pacific, British Airways, and Microsoft. The company has raised $50M and has offices in Miami and Oslo with remote employees across the US and Europe.

About the role

This is a B2B contract role, approximately 40 hours per week, open only to candidates based in Poland. You will maintain and scale front-end (React, TypeScript) and back-end (C#/.NET) architecture, build accessible components for an internal design system, and develop Python-based data processing. Depending on the team, you may work on supplier-facing applications or internal tools, using modern AI technologies.

A typical day

A typical day could involve writing or reviewing React/TypeScript components, working on C#/.NET back-end services, and building or updating design system components. You might also write Python scripts for data processing and spend time evaluating or integrating AI technologies. The role is remote and self-driven, so you would manage your own schedule and make technical decisions with limited supervision.

Who Chooose is looking for

• Based in Poland and able to work as a B2B contractor, approximately 40 hours per week.
• Experienced with React and TypeScript on the front end and C#/.NET on the back end.
• Comfortable writing Python for data processing tasks.
• Open to new technologies, willing to experiment, self-driven, and able to make decisions without close supervision.

Tips for this application

• State clearly in your application that you are based in Poland and can work under a B2B contract; this is a hard requirement.
• Show concrete examples of maintaining and scaling React/TypeScript front ends and C#/.NET back ends, not just listing the technologies.
• Mention any experience building accessible components or contributing to a design system, since the role explicitly includes this.
• Include examples of Python-based data processing work, even if it was a smaller part of a previous role.
• Describe situations where you experimented with new technologies or made technical decisions independently, because the role asks for self-direction and openness to new tools.

What to cover in your cover letter

['Your location in Poland and your ability to work as a B2B contractor at roughly 40 hours per week.', 'Specific projects where you maintained or scaled React/TypeScript and C#/.NET systems.', 'Any work on design systems or accessible UI components.', 'Examples of Python data processing and your approach to learning or experimenting with new technologies, including AI tools.']

Research before applying

• Read how Chooose describes its platform for sustainable aviation fuel programs and carbon management on its website.
• Look up the SAF programs and carbon initiatives of its customers, such as Delta Air Lines, Cathay Pacific, British Airways, and Microsoft.
• Check Chooose's engineering blog, GitHub, or public talks for details on its tech stack and how it uses AI.
• Find out what a B2B contract arrangement typically involves in Poland, including invoicing and tax considerations.

Likely interview topics

Based on the job description, expect questions about:

• How you have maintained and scaled a complex React/TypeScript front end and a C#/.NET back end in a production environment.
• Your process for building accessible, reusable components for a design system.
• A Python data processing task you have worked on and the decisions you made.
• How you evaluate and adopt new technologies, including AI tools, in your work.
• How you handle self-directed work and make technical decisions when requirements are not fully defined.

Common mistakes to avoid

• Applying without confirming you are based in Poland and can work as a B2B contractor.
• Listing React, TypeScript, C#/.NET, and Python as skills without showing where you used them together or at scale.
• Presenting yourself as only a front-end or only a back-end developer when the role requires both.