Do you only build the app, or the backend too?

Both, when both are in scope. The offline-sync behavior that makes a mobile app usable is only as good as the backend's conflict-resolution logic, so we treat the two as one system rather than a handoff between separate teams working from separate specifications.

What happens if Apple or Google rejects the submission?

Store review is part of the phase, not a separate cost. Rejections get fixed and resubmitted as part of delivering that phase's stated output, since a submission that hasn't cleared review isn't a finished deliverable, and we don't bill it as one.

Can you take over an app another team built?

Yes. Joining an existing React Native codebase and owning a scoped workstream is one of the two entry points we work from, alongside greenfield builds.

Do you build native iOS/Android apps as well?

Our practice is React Native and Expo, not separate native Swift/Kotlin codebases. Where a feature genuinely needs a native module, we write and maintain that module inside the same Expo project, rather than forking into two codebases to support it.

Mobile and application development — React Native and Expo

CorpiXo builds React Native and Expo apps with offline-first sync, backed by Go and Rust services and React on the web. Store delivery and the backend that supports the app are built under the same engagement, so the handoff between them isn't a source of bugs. Most of what makes a mobile app feel unreliable happens at the sync boundary, not in the UI, which is why that boundary gets the most deliberate design attention here. An app that looks finished in a demo and one that survives a subway tunnel and a week-old local cache are different engineering problems, and the second is the one that determines whether users keep the app installed.

What we build

Offline behavior is treated as a first-class requirement in each of these, not a stretch goal added once the happy path works. Conflict resolution gets a written policy, not an implicit one discovered the first time two devices edit the same record offline.

A React Native/Expo app with offline-first data sync and conflict resolution
Store delivery — App Store and Play Store submission, including fixes for review-process feedback
A Go or Rust backend service, with its own test suite and deployment pipeline
A React web client sharing data contracts with the mobile app, when both are in scope
Push notification and background-sync infrastructure, sized to the app's actual usage pattern
Crash and performance monitoring wired in before launch, not added after the first incident

Stack

React Native · Expo · Go · Rust · React

Go and Rust are used based on the service's needs — Go where a straightforward, well-understood backend is the right tool, Rust where performance or memory guarantees matter enough to justify the extra development cost. Neither is chosen by default; the sync and backend architecture decides which fits before any code is written, and that decision is written down as part of the architecture phase, not left as an unstated assumption.

How this is usually scoped

A new app is usually fixed-scope and phased through to first store submission, since store review introduces its own timeline the client doesn't control — discovery and architecture look the same as any engagement (see How we work), with build broken into demoable increments the client can test on a device early, rather than a single build phase that ends in an unpleasant surprise. Ongoing feature work on an app already in the store is usually hourly.

Read how hourly and fixed-scope engagements work

What you receive at handover

Independence at handover means the client's own engineers can ship the next release without CorpiXo standing in as the app's institutional memory. That includes knowing why the sync layer makes the choices it makes, not just how to redeploy it — a decision log survives longer than any one engineer's memory of the project.

Full repository — mobile app, backend services, and web client where applicable
App Store and Play Store account access and submission history
Backend deployment configuration and runbook
A test suite covering offline-sync edge cases, not just the happy path

See the full delivery process, phase by phase

Frequently asked questions

Do you only build the app, or the backend too?: Both, when both are in scope. The offline-sync behavior that makes a mobile app usable is only as good as the backend's conflict-resolution logic, so we treat the two as one system rather than a handoff between separate teams working from separate specifications.
What happens if Apple or Google rejects the submission?: Store review is part of the phase, not a separate cost. Rejections get fixed and resubmitted as part of delivering that phase's stated output, since a submission that hasn't cleared review isn't a finished deliverable, and we don't bill it as one.
Can you take over an app another team built?: Yes. Joining an existing React Native codebase and owning a scoped workstream is one of the two entry points we work from, alongside greenfield builds.
Do you build native iOS/Android apps as well?: Our practice is React Native and Expo, not separate native Swift/Kotlin codebases. Where a feature genuinely needs a native module, we write and maintain that module inside the same Expo project, rather than forking into two codebases to support it.

Talk to us about mobile and application development