Mobile / Web Developer - AI Spatial Products - Sizeless team

We at  Holycode  are currently looking for a passionate and experienced  Mobile / Web Developer  to join  sizeless , a  YC S23-backed startup  building the data layer of the built world.

About the company Sizeless turns smartphone videos into high-accuracy digital twins of buildings and infrastructure — no special hardware needed.

Their mission : digitize the built world and provide a unified data layer that empowers architects, engineers, and energy consultants to make smarter, faster decisions — unlocking new insights and AI-driven applications.

They are a small, high-energy, YC-backed team delivering outsized impact.

You will work directly with their founder & CTO, push the boundaries of computer vision and 3D reconstruction, and spatial intelligence.

All roles tackle the same core challenge : turning smartphone video into reliable, structured spatial data.

You’ll Work On They are looking for a  Mobile / Web Developer  to help build and scale their mobile capture experience and 3D visualization stack.

You will work on production systems that turn real-world environments into usable digital building data.

This role sits at the intersection of mobile development, web front-end, and 3D visualization.

While you will interface with computer vision and spatial data, the focus is on product, UX, and reliable delivery.

Your Profile Strong experience in  mobile or web development  (iOS / Swift and / or modern web frontend) Solid frontend fundamentals and  product-oriented thinking Experience with or strong interest in  3D visualization  (e.g.

Three.js, WebGL, interactive 3D UIs) Comfortable working with  complex datasets  and performance-sensitive applications You enjoy ownership, fast iteration, and working in small, high-impact teams Bonus : Experience with spatial applications, AR, or 3D viewers Exposure to geometry, mapping, or visualization-heavy products   Key Responsibilities Build and improve the  mobile capture experience (iOS) , including :  reliable video acquisition, smooth scanning flows, error handling and real-time user feedback Contribute to  processing and visualization pipelines , integrating reconstructed geometry and large spatial datasets Develop and extend the  web-based 3D Viewer  using Three.js / WebGL Implement interactive tools such as camera controls, measurements, and UX improvements Collaborate closely with backend and algorithm teams to integrate new features into production Ensure performance, usability, and reliability across devices Take ownership of features through implementation, deployment, and iteration (Optional) Collaborate with the AI / algorithm team to integrate new spatial or geometry-related capabilities into the product   Why you will love working here Tackle unique technical challenges in computer vision, 3D reconstruction, and spatial intelligence Be part of a small, high-impact team backed by Y Combinator and world-leading investors Shape the future of digital twins and spatial data for buildings Familial working atmosphere in an open-minded multinational team Working remotely (from Romania) All necessary equipment – up to you to decide what you prefer A budget for professional improvement (courses, conferences, books) A budget for multi-benefits platform (meal tickets, private pension, etc.) Premium private medical subscription with nationwide coverage Budget for mastering English and German Skilled and senior co-workers Opportunities to build products that really make a difference Opportunities to learn and grow with us   If you are looking for an environment where you can grow professionally, work on technically challenging problems, and build real-world AI products with impact,  please submit your CV in English .

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