Service
Apps that earn their place on the home screen.
A phone is the most contested screen a business will ever compete for. An app that is slow to open, awkward to navigate, or useless without signal does not get deleted in anger. It just stops being opened, which is worse, because nothing tells you it happened.
We build for the way phones are actually used: on bad connections, one-handed, in a hurry. Mobile engineering at Zefract covers native and cross-platform builds, the mobile-first details that make an app feel native rather than ported, and the release and monitoring work that keeps it healthy across every OS update that follows.
When an app needs the best the platform can give (performance, hardware access, or interactions that must feel exactly right), we build it natively in Swift or Kotlin.
Native is the right answer less often than it used to be, and unmistakably the right answer when it is. We will tell you which case you are in before you pay for either.
One codebase, two stores. React Native and Flutter cover the great majority of apps at a fraction of the cost of building the same product twice, and the gap in feel has narrowed to the point where most users could not pick it.
Where a specific screen or feature genuinely needs to be native, we bridge to it rather than compromising the whole app for one requirement.
The details that separate an app from a website in a shell. Gestures that behave the way the platform taught people to expect, and states designed for a phone rather than shrunk down from a desktop.
Offline sync, push notifications and deep linking are treated as core rather than extras: they are what make an app usable on a train and worth reopening after the first session.
Getting it live, which is its own discipline. Store submissions have review guidelines, metadata requirements and rejection reasons that are much easier to satisfy before you hit submit than after.
We handle both stores, run beta builds through TestFlight and its Android equivalent so real people see it before the public does, and keep versioning tidy enough to roll back if needed.
An app is never finished, because the phones underneath it keep changing. Every OS release is a compatibility event, and the apps that quietly stop working are usually the ones nobody was watching.
We test across a real device matrix rather than one simulator, monitor crashes in production, and plan OS migrations as scheduled work instead of emergencies.
Why it matters
The store listing is not the finish line. Retention is decided in the first session and defended every release after it: by launch speed, by whether the thing works on a train, by whether the last OS update broke something nobody caught. An app is a relationship with a device, and devices change underneath you.
Here’s what building it properly returns:
Real gestures, platform conventions and transitions that behave the way the operating system taught your users to expect. The difference between an app and a website in a shell is felt immediately, even when it cannot be named.
Offline sync and considered loading states mean a tunnel or a weak connection is an inconvenience rather than a dead end, which is where most apps quietly lose the people who needed them most.
Cross-platform where it fits, native where it does not, plus the submission, beta and versioning work that turns "it builds" into "it is live on both stores".
Device testing, crash monitoring and planned OS migration, so an update from Apple or Google is a scheduled task rather than an emergency and a wave of one-star reviews.
Push notifications and deep linking designed as part of the product rather than bolted on, so a message opens the right screen instead of dumping someone at a home tab.
Crash reporting and usage analytics from the first release, so decisions about the next version are made from what people actually do rather than from store reviews.
Home screen space is the scarcest real estate your brand will ever hold. An app keeps it by being fast, being reliable, and working on the days the network does not.
Why Mobile Engineering with Zefract
The people designing the screens are the people shipping them, so the interaction that looked effortless in the prototype is the one that reaches the store. You see builds on TestFlight as they happen, not a demo at the end.
Ready to build for the small screen?
Start with a mobile scoping callFAQ
Next step
Send whatever you have. You get scope, a timeline and a number back within three working days.
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