Contract design and product engineering · London
Senior design and product engineer for teams that need to ship
I design and build product UI, design systems and front-ends in React, Next.js and SwiftUI. I've taken my own iOS apps from idea to App Store, and I run the systems that market them.
I'm Sammii, a design engineer based in London. I work in the space between design and code: turning product thinking into interfaces, components and systems that hold up in production. Recently that has meant shipping four iOS apps through App Store review, building Prism, a zero-dependency component library, and running Lunary, a Next.js PWA, with an automated content and operations stack on a Mac mini behind it.
Selected work
Products I've designed, built and shipped myself, from App Store apps to the systems that run them.
Prism
React component library
A cursor-reactive React component library with hand-written spring physics and zero runtime dependencies.
Lunary
Next.js PWA
An astrology and journaling web app with real astronomical calculation, subscriptions and a large content library.
iPrep
iOS app
A voice interview coach for iPhone: answer out loud, get a scored breakdown, and practise what you're weakest at.
Strata
iOS app
An interactive map of the cosmos and recorded history, built to make huge differences in scale something you can see.
PostReady
iOS app
A teleprompter and recording app that turns one take into a captioned, cut and retouched short video on the phone.
Content and ops fleet
Automation on a Mac mini
An automated content and operations system that drafts, schedules, replies and reports for 11 brands, with approval gates.
Services
Mostly contract roles inside product teams, plus a few fixed-scope offers.
Contract design and product engineering
A senior or staff-level design engineer embedded in your team, from Figma to production.
Learn more →Design systems and component libraries
Tokens, components and documentation that help teams move faster with fewer mistakes.
Learn more →UX and accessibility audits
Practical recommendations that improve flow, hierarchy and usability.
Learn more →App Review Rescue
Stuck in App Store review? A free Rejection Decoder, a ship kit, or a done-for-you fix.
Learn more →How a contract starts
- 01
Intro call
Twenty minutes on the team, the problem and what a good first month looks like. If I'm not the right fit, I'll say so.
- 02
Terms in writing
Day rate, length, IR35 status, office days and notice agreed up front. Direct contract or through your agency.
- 03
Ship in week one
Something small and real goes out in the first week, so access, codebase and review flow are proven early.
- 04
Weekly written updates
Each Friday: what shipped, what's blocked, what's next. Handover notes from day one, so nothing lives only in my head.
Hiring for a design or product engineering role?
Tell me about the team and the work. I reply within one working day.