01 2024 — present
Cheddar
A photo-booth that lives between an iPad, a Sony α and a printer on a Raspberry Pi. Native Swift rendering, sub-second capture-to-print, runs at hundreds of events.
iOS · Flutter · Swift · Sony α · AirPrint
Available · Q3 2026
Building software
that lives in real devices.
// selected work
02 2022 — present
OneBooth + api2
The B2B platform that runs the studios — customer dashboard, event configuration, photo delivery. Schema versioned across 280+ migrations, production-grade error budgets.
Next.js · Node · Postgres · 280+ migrations
03 2025
WhosNext
An indie decision-maker app shipped to the App Store. 14 tools — finger chooser, lucky wheel, dice, coin — under one playful canvas.
Flutter · iOS · App Store
04 2025
OneFlow
A headless print-orchestration service for event hardware fleets. Hot-swappable images, mDNS discovery, runs on Pi 4 in production today.
Go · Linux · Raspberry Pi · Avahi
// what i do
iOS & Flutter apps
Native-grade mobile, built to ship.
Hardware integration
Cameras, printers, embedded — software that talks to metal.
Backend & APIs
Postgres, Node, Edge. Migrations you can trust.
AI / RAG pipelines
Grounded LLM features that don't hallucinate.
// about
I'm Salah Alhaji — a full-stack product engineer based in Germany.
I build products at the seam of software and hardware: iOS apps that drive Sony cameras and printers, backend systems that orchestrate dozens of moving parts, and AI features that ship grounded answers.
For the last few years I've shipped photo-booth software running on hundreds of events — across iPad, embedded Linux, and the cloud. I work directly with founders who want their product to feel inevitable.