Selected clients
Binary Craft is an independent development studio in Berlin, founded and run by Matthias Zarzecki: 12+ years of mobile engineering and 60+ shipped projects for clients like IBM, Allianz, Telekom, STIHL, and Dr. Oetker. The studio specialises in Bluetooth & IoT integrations, accessibility, mobile CI/CD, and the unglamorous engineering that makes apps feel inevitable.
SwiftUI and UIKit. Universal apps from iPhone to iPad to Mac Catalyst. App Store submission, TestFlight, and the long tail of platform paper-cuts.
Cross-platform apps that don't feel cross-platform. Custom widget systems, Dart packages, and the considered native plugins it takes to actually ship on both stores.
CoreBluetooth, GATT, NFC. Apps that talk to garden tools, e-bikes, safety wearables, and anything else with a radio.
Pipelines that build, test, sign, and ship without a human in the loop. Binary Craft has cut deployment times by 90%, migrated whole platforms, and teaches the discipline in workshops too.
The name reflects how Binary Craft approaches the work. Software is built from the smallest possible units - zeros and ones, characters and tokens. But the act of assembling them well is a craft, the same way joinery or letterpress is a craft. Care at small scales becomes quality at large ones.
Binary Craft was founded by Matthias Zarzecki, a senior mobile engineer who has worked in larger organisations and inside other people's processes - and watched good ideas dissolve through too many handoffs. The studio stays deliberately small: the people you brief are the people who write the code, ship the build, and answer your bug report. Fewer handoffs, fewer apologies.
Binary Craft takes on a small number of engagements at a time and turns down work it can't do well. If that sounds like the kind of partner you need, let's talk.