Sisnex
The handoff problem in software agencies
When a business hires a traditional agency to build an iOS or Android application, the person who writes the proposal is rarely the person who writes the code. Requirements pass from a sales director to a project manager, then to a UX contractor, and finally to separate mobile and backend developers who have never spoken to an actual user of the system.
By the time the first build arrives on a physical phone, months have passed and fundamental assumptions about offline behavior, permissions, or backend latency turn out to be wrong.
Principal engineers from specification to store review
Sisnex LLC was founded in Sheridan, Wyoming to run the opposite model: a deliberately small, principal-led engineering practice where the engineer who scopes your system is the engineer who writes the Swift, Kotlin, Flutter, and Go code.
1. Written technical specifications before code
Every engagement begins with a concise, written specification. We document the data model, the exact API payloads, what happens when the device loses cellular connectivity mid-transaction, and how subscriptions reconcile between Stripe, StoreKit 2, and Google Play Billing.
2. Weekly builds on real hardware
Static slide decks hide latency and gesture awkwardness. Starting in week two, we distribute signed builds through Apple TestFlight and Google Play Internal Testing. You tap through real screens on your own phone every Friday while there is still time to refine the flow.
3. Owning both sides of the wire
A mobile app is only as reliable as the API behind it. Because we engineer both the mobile client and the Go/PostgreSQL backend together, we eliminate the finger-pointing between frontend and backend teams and ship features in a single vertical slice.
If you are planning a new mobile product or rescuing an existing codebase, get in touch with us.