Sisnex
Mobile software built to hold up in the real world.
We engineer iOS, Android, and Flutter applications for teams that need dependable software, and we publish our own products on the App Store and Google Play.
What we build
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Native iOS applications
iPhone and iPad software written in Swift and SwiftUI for 120Hz responsiveness, low energy use, and smooth App Store review cycles.
Swift 6, SwiftUI, StoreKit 2
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Native Android applications
Kotlin and Jetpack Compose applications designed for diverse Android hardware, foldables, and strict background execution limits.
Kotlin, Jetpack Compose, WorkManager
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Cross-platform Flutter apps
Single-codebase iOS and Android applications powered by Flutter when shared delivery speed matters and native bridges handle hardware features.
Flutter, Impeller, Platform Channels
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Mobile backends and APIs
Low-latency Go services, PostgreSQL databases, and webhook processors built specifically for mobile clients on unstable cellular networks.
Go, PostgreSQL, Stripe, APNs and FCM
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Product specification and interface design
Written technical specifications, user flows, and platform-native interface systems tested on physical devices before coding starts.
HIG, Material 3, Interactive Prototypes
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Long-term maintenance and OS updates
Monthly retainers that keep production apps compliant with new iOS and Android SDK requirements, security patches, and store policy changes.
Annual OS Upgrades, Crash Triage, SLA
How we work
Every project starts with a written technical specification covering what the application does, which platforms it targets, how offline storage and backend APIs behave, and the exact schedule for delivery. You receive a clear fixed quote or monthly retainer before we write a line of code.
We work in weekly cycles and ship signed builds through Apple TestFlight and Google Play Internal Testing. You try the actual application on your own phone starting in week two, rather than waiting months for a final reveal.
When the product is ready to launch, we manage App Store and Play Console review, production monitoring, and annual OS compatibility updates.
Our own products
Alongside client work, Sisnex builds, owns, and operates its own commercial applications on the Apple App Store and Google Play. Running our own software in production keeps our practices grounded in the same StoreKit 2 migrations, Play Billing rules, and crash-free targets our clients depend on.
Engineering notes
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Native Swift & Kotlin vs. Flutter: how we advise clients in 2026
A practical decision framework for choosing between true native iOS/Android codebases and a unified Flutter application based on hardware depth, longevity, and team budget.
2 min read
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Designing offline-first mobile apps that never lose user work
Cellular networks drop in elevators, subways, and warehouses. How we architect local SQLite state and idempotent Go sync endpoints for iOS and Android.
2 min read
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Why we build mobile software with a senior-only studio model
Most mobile projects fail in the handoffs between account managers, junior contractors, and disconnected backend teams. Here is how Sisnex structures engagements differently.
2 min read
Company record
- Legal entity
- Sisnex LLC
- Structure
- Limited Liability Company in Wyoming
- Wyoming filing ID
- 2026-002061431
- Incorporated
- August 20, 2026
- Registered office
- 30 N Gould St, Ste N, Sheridan, WY 82801, United States