**Join sizeless (YC S23) — Building the Data Layer of the Built World**



At sizeless, we turn smartphone videos into high-accuracy
**digital twins**
of buildings and infrastructure — no special hardware needed. Our 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.



We’re a
**small, high-energy, YC-backed**
team delivering outsized impact. Work directly with our 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**
.


Tasks


**You’ll Work On**

You’ll work directly with our CTO on the mobile capture and 3D visualization pipeline: turning smartphone video into reliable, structured spatial data that architects, engineers, and energy consultants can actually use. This is applied computer vision and 3D reconstruction with
**immediate real-world impact**
.



**What you’ll do:**




- Build and improve the mobile capture experience: reliable video acquisition, smooth scanning, error handling, and real-time feedback.

- Optimize processing pipelines: reconstruction, feature tracking, and 3D model generation.

- Work with CV & 3D geometry: tracking, depth estimation, and analytics.

- Contribute to the web-based 3D Viewer: Three.js / WebGL implementation, interactive tools, and UX improvements.

- (Optional/bonus) Collaborate with the AI/algorithm team to integrate new features or enhancements from the research side.



Requirements


**Who You Are**




- You have experience in mobile or web development (React / iOS preferred)

- You have strong problem-solving skills and curiosity for applied computer vision, 3D reconstruction, or spatial computing

- You enjoy building end-to-end solutions and taking ownership

- Bonus: Experience with 3D visualization, Three.js/WebGL, or AR/Spatial apps

- You thrive in small teams, fast iteration, and high-impact environments



Benefits


**What We Offer**




- Work directly with the founders & CTO, influencing core product and architecture

- Tackle unique technical challenges in CV, 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

- Flexible work arrangements, autonomy, and a learning-first culture




If AI, 3D tech, and real-world problem solving excite you,
**come build the data layer of the built world with us**
.