Freelance Full-Stack Developer (React.js)

We’re Blazity — a team of React.js and Next.js experts creating powerful web experiences. We have years-long relationships with many of our clients. As trusted development partners, we take full ownership of the projects and continuously optimize apps, stores, websites, and implement new features, or automate workflows.

Looking for your next adventure? As it is said, you must gather your party before venturing forth — so why not join us?

Fueling Innovation, igniting Careers — join us Now! 🚀

As we continue to expand, we are looking for an experienced Full-Stack Developer to join us for a high-impact Defence & Intelligence clickable demo project (freelance, ~4 weeks). If you have experience with advanced data visualization, geospatial rendering, and Next.js, we’d love to hear from you!

Our requirements

• 5+ years of experience as a Frontend / Full-Stack Developer,

• Strong proficiency in React and Next.js,

• Experience with D3.js, deck.gl, WebGL or similar visualization frameworks,

• Experience with 3D visualization libraries (CesiumJS or similar),

• Understanding of performance optimization techniques for large-scale interactive UIs,

• Experience with cloud platforms and deployments (e.g. Vercel, CI/CD pipelines),

• Experience working in international and Agile teams,

• English at least C1 level,

• Ability to work independently in a fast-paced, delivery-focused environment.

Nice to have:

• Experience with military / geospatial visualization projects,

• Prior production experience with CesiumJS.

Scope of responsibilities

• Build interactive force-directed network graphs (2,000+ nodes) using D3.js + deck.gl,

• Implement 3D terrain visualization and asset overlays using CesiumJS,

• Integrate GenAI chat functionality via OpenRouter API,

• Implement animated simulations and real-time asset repositioning logic,

• Ensure application performance, scalability, and best coding practices,

• Deploy and maintain the demo on Vercel with CI/CD and zero-downtime updates.

What we offer

• Freelance project (~4 weeks engagement) with possible follow-up work

• Rate: 140–160 PLN/h (B2B)

• High-visibility, cutting-edge Defence & Intelligence demo project

• Fully remote collaboration with senior engineering and product stakeholders

Salary ranges

140-160 netto+VAT / h 

Location

100% remote from Poland