【Company Overview】 At Eukarya, we develop and provide "Re:Earth," a next-generation open-source WebGIS (Geographic Information System) platform. Re:Earth is known for its high scalability and intuitive user interface. It is the first WebGIS to incorporate a plugin system that operates entirely in the browser. As an open-source platform, Re:Earth is also publicly available. We aim to deliver value created collaboratively with our contributors to society at large, and we showcase our achievements at global conferences such as FOSS4G. Website: https://eukarya.io note (Japanese): https://note.com/eukarya Engineering Blog: https://reearth.engineering GitHub: https://github.com/reearth 【Responsibilities】 ・Lead the architectural design and reconstruction of a front-end OSS library ・Redesign interfaces with attention to integration with existing systems ・Visualize and break down technical debt, and drive incremental refactoring ・Establish QA processes such as regression testing to enable early bug detection ・Develop reusable modules with a focus on performance and scalability ・Organize and redefine 3D/2D rendering features ・Maintain and improve technical documentation ・Contribute to the OSS community, including managing PRs and issues 【Tech Stack】 ・Languages: TypeScript, JavaScript, Go, Rust ・Libraries / Frameworks: React, Cesium ・Testing: Vitest, Playwright, WebGL, WebAssembly ・Others: GitHub, Notion, Slack, Figma, various AI tools 【Highlights】 ・A development environment leveraging cutting-edge front-end technologies such as React, TypeScript, and WebGL ・Opportunities to work on library and middleware development, a technically demanding area within front-end engineering ・Engage in highly technical and challenging work as an engineer within a business model centered around open source—still rare in Japan ・Your contributions will be publicly recognized, such as being credited in release notes ・Work directly under the CTO Office, with significant ownership over technical decision-making ・Gain collaborative experience with global developers while helping grow the OSS community

【Required skills】 ・3+ years of experience in front-end development using React and TypeScript ・Deep expertise in state management, rendering performance, and API design

【Welcome Skills】 ・English communication skills ・Experience contributing to or maintaining open-source software (OSS) ・Rendering experience using WebGL, WebGPU, or Three.js ・Experience with Rust and WebAssembly for low-level, performance-oriented development ・Designing interfaces between multiple engines and maintaining related documentation ・Experience with OSS activities and sharing technical knowledge with others ・Involvement in projects focused on managing and resolving technical debt

【What We're Looking For】 ・Someone who can go beyond simple replacement and understand the reasoning behind the current architecture, while also envisioning its future form ・Someone who feels a sense of responsibility and fulfillment in redesigning core technologies ・Someone who grows alongside the team and helps build a sustainable foundation, both in terms of code and shared knowledge