Native app · React Native, Expo
Strata
One zoom gesture on one log-scaled axis: the ISS overhead to the edge of the observable universe on a single Skia canvas, and nothing collapses into a pixel.
- Skia canvas
- log-scale zoom
- gesture design
Sammii Kellow
I build interfaces that feel as considered as they are engineered.
My work spans design engineering,
AI product engineering and product engineering,
from the first interaction to production.
Selected work
Product · Next.js, Tailwind CSS
Kern
Variable-font axes you drag, spring-animated, with side-by-side comparison and a proper specimen sheet. Holding the Type Lab slot until Type Lab exists.
- variable fonts
- optical sizing
- spring motion
Product · Next.js, TypeScript
Gamut
- 50
- 100
- 200
- 300
- 400
- 500
- 600
- 700
- 800
- 900
- 950
OKLCH as a working tool: 11-step scales on perceptual lightness curves, sRGB gamut clamping and WCAG checks, previewed live in light and dark.
- OKLCH
- perceptual scales
- WCAG contrast
- PrismA component library built on spring physics: cursor-reactive buttons, spotlight cards, ripple effects and a shader playground.
- LunaryTurning live planetary and lunar positions into an interface people read daily: information design for a system that never stops moving.
- LattiqA collaborative editor where the design problem is what happens when two people type at once.
Labs
Things that don't belong in case studies.
labs.sammii.dev Opening soon
About
I started in graphic design and visual communication. I moved into engineering to build the things I was designing, and I now build products end to end: the interface, the system underneath it, and the AI that has to be made usable.
The through-line is the seam between design and code. At Garden Computing I built the design system and component library from scratch: a Radix-based headless layer, design tokens, shared primitives, and I owned brand, marketing and component architecture at once. At ASOS I built a date-based seasonal theming system that activates and deactivates itself, which removed the manual release cycle entirely. Gamut is my OKLCH colour engine, implemented from first principles because I wanted to understand the colour space well enough to make decisions in it.
Lunary is the product I run on my own: design, engineering, AI orchestration, analytics and marketing. It is live and it has paying subscribers, and it is where I learned what a design system has to do when one person ships every surface.
Trained as a designer (MA Visual Communication), then an immersive software engineering course at General Assembly. The instinct is still the same one: build things that look and feel right, and now applied AI is where that has the most room.
Experience
- 2026nowFounderLunar Computing, IncLunary: design, engineering, AI orchestration and infrastructure, owned solo.
- 20252026Founding Design EngineerGarden ComputingComponent library and design system from scratch: shared primitives, design tokens, a Radix-based headless layer.
- 20242025Senior Front-end EngineerBots (Bond Origination Technologies)Search and analytics layers; features from concept to launch.
- 20222024Web EngineerASOS.comDate-based seasonal theming system, site-wide accessibility, the typography system in the shared component library.
- 20202022Full Stack EngineerRare: GroupAtomic design system of reusable Vue components; UI for data-visualisation apps.
- 20192019Software Engineer, immersive programmeGeneral AssemblyThe move from design into engineering.
- 20182019Graphic DesignerSITAPrint and digital design across exhibition, web, email and advertising.
Contact
Looking for a senior or staff design engineering role, London or remote. The fastest way to reach me is email.