Job description
We at Holycode are currently looking for a passionate and experienced Mobile iOS 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 iOS Developer to help build and scale their mobile capture experience. You will work on production systems that turn real-world environments into usable digital building data, with a strong focus on iOS, product quality, UX, and reliable delivery.
While your core responsibility will be iOS development, this is a startup environment: you’ll collaborate closely across disciplines and may occasionally contribute to adjacent areas (product, web dev, tooling, debugging pipelines) as needed to ship great software.
Your Profile
- Strong experience in mobile iOS development (Swift)
- Solid mobile engineering fundamentals and product-oriented thinking
- Experience building reliable, performance-sensitive mobile applications
- Comfortable working with complex datasets and performance-sensitive applications
- You enjoy ownership, fast iteration, and working in small, high-impact teams
- You’re pragmatic and adaptable, and comfortable wearing multiple hats when needed
Bonus:
- Experience with spatial applications, AR, or 3D related products (Three.js / WebGL, etc.)
- Exposure to geometry, mapping, or visualization-heavy products
- Experience with web development (React/Next.js or any other modern web frontend frameworks)
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
- 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.
