Senior Fullstack Developer (React / Node.js / Canvas API)

Join a US-based construction tech project to evolve a cloud-based platform (AWS) used for high-precision cost estimation, digital measurements, and project management. This is a "heavy-logic" role where you will manage complex computational tasks—such as calculating dimensions and material costs—while rendering high-performance interactive graphics. You will balance stabilizing the existing codebase with the development of sophisticated new features for a growing platform. Details • Start Date: May 11, 2026 (ASAP). • Duration: Until January 31, 2027 • Capacity: Full-time (FTE). • Rate: up to 130 pln/h net B2B • Location: 100% Remote (USA-based client). • Work Ratio: Initially 60% Bugfixing / 40% New Features (shifting towards more new features over time). Responsibilities • Visual Engine Development: Building and maintaining interactive measurement tools using Canvas API or WebGL. • Computational Logic: Implementing and optimizing complex business logic for real-time cost estimations, area measurements, and scale calculations. • Fullstack Engineering: Developing scalable microservices in Node.js and high-performance frontends in React (TypeScript). • Platform Stabilization: Identifying and resolving critical bugs within the specialized digital measurement toolset. • Cloud Infrastructure: Working within an AWS cloud environment and managing containerized deployments via Docker. Requirements • Graphics Expertise: Proven commercial experience with Canvas API and/or WebGL. • Business Logic: Strong background in building "computational" applications (handling dimensions, complex math, or financial estimation). • Fullstack Stack: Senior-level proficiency in Node.js, React, and TypeScript. • Architecture: Experience with Microservices and Docker. • Language: Fluent English (C1) for direct collaboration with the US team.