Capability · Mobile app development
We build, protect, and scale mobile products that pass due diligence and survive growth. Senior judgment on architecture and releases, not order-taking. So you are not rebuilding six months from now.
Whether your code came from contractors, a departed founding engineer, or fast iteration, the failure mode is the same: velocity without someone asking whether you are building the right thing for the next stage.
The mistakes that kill companies are not minor bugs. They are decisions: the wrong architecture, the wrong data model, the shortcut that saves a week now and costs a quarter later.
We build with that lens. Not only shipping features, but making sure what ships can survive diligence, hiring, and scale.
Three ways to engage depending on where you are. Each is anchored in technical judgment.
Most teams build what you ask. We build what you need and push back on the rest. For teams that want owners, not ticket-takers.
Your codebase carries risk you cannot see from the roadmap. We audit the decisions that hurt you later and give you a clear plan.
You have momentum. You need a partner who can grow with the product and tell you what not to build. For teams that need leadership without a full-time mobile executive.
We map the system, find what breaks at scale, and sequence the fix. You leave with a roadmap investors can read.
Typical window · two weeks
React Native and TypeScript for most products. Monitoring, tracing, and release hygiene built in from the start.
Typical window · eight to twelve weeks
Authentication, data handling, and vulnerability work aligned with what auditors and buyers actually check.
Typical window · four weeks
Load time, stability, and release risk addressed as engineering work, not slogans.
Typical window · four to six weeks
Architecture notes, test posture, and the narrative reviewers expect during diligence.
Typical window · two weeks
| Traditional agency | Vermillion |
|---|---|
| Junior-heavy benches | Senior engineers |
| Retainers without clear outcomes | Scoped work and explicit handoff paths |
| Hands off after launch | Train your team or plan graduation |
| Build exactly what you request | Tell you what you actually need |
| Hourly billing by default | Clear phases and timelines, scoped per proposal |
One codebase for iOS and Android, TypeScript end to end, Expo where it shortens the path to reliable releases. For stack detail and conventions, see React Native development→.
Sometimes the product needs maximum platform integration or real-time media. We ship Swift and Kotlin with the same diligence bar as our React Native work.
Swift, platform conventions, and release discipline that fits App Review.
Kotlin, real-device coverage, and behavior across OEM variance.
The question is not a slogan. It is what gets you to the next stage with a codebase you can defend.
APIs, auth, jobs, and data stores sized for how subscription apps actually fail: webhooks, receipts, entitlements, and operational visibility.
We work in Python, NestJS, and Go depending on your team and constraints. Infrastructure on AWS or GCP, containers, CI/CD, and observability wired in.
When the client layer allows it, Expo Updates shortens the loop from fix to users. Native changes still ship through store review. We are explicit about which class of change belongs where.
PicklePlay is our reference: critical client issues addressed quickly, stores and tooling kept stable through a high-growth arc and acquisition.
Rebuilt the mobile surface and backend contracts, cleaned state and observability, and made the story legible to buyers. User base scaled materially; outcome was acquisition by Universal Tennis.
Vermillion rebuilt our app in 12 weeks. We went from losing users daily to 200K active users. UTR acquired us shortly after.
Weeks 1 to 2
Codebase read, risk list, and rebuild or migration sequence. You get a written plan.
Weeks 3 to 14
Demos on a cadence we agree with your team. Stability and scope move together so leadership can see progress.
Weeks 15 to 20
Documentation, tests, runbooks, and training so your team or the next hire can own it.
MVPs, rebuilds, and ongoing support are quoted after we understand the codebase and your runway. Pricing per scope. Buyers ask on a call.
HIPAA-aligned flows, device reality, secure transport.
PCI-minded integrations, KYC flows, reconciliation.
Realtime surfaces, moderation hooks, push infrastructure.
Payments, discovery, fulfillment loops.
If any of these is true, start with a short call. 15 minutes. No pitch.
Dev shops execute tickets. We challenge the plan, sequence risk, and ship with diligence in mind.
Yes. Scope starts with audit and alignment, then build.
Most MVPs fall in an eight to twelve week band. Complexity and decision speed move the needle.
Yes. We have supported teams through technical diligence and financing with founders we engineered alongside.
15 minutes. We surface the biggest technical risks and a realistic sequence. No pricing deck on this page.
Book a 15-min Strategy Call