We build, protect, and scale mobile products that pass due diligence and survive growth. so you’re not rebuilding six months from now.
Whether your code was written by AI tools, offshore developers, a founding engineer who left, or your co-founder learning as they go. the problem is the same: you’re shipping fast, but nobody is asking whether you’re shipping right.
The mistakes that kill startups aren’t bugs. They’re decisions: the wrong architecture, the wrong database, the wrong framework, the shortcut that saves a week now and costs six months later.
That’s where we come in, not just to build, but to make sure what gets built can actually survive what comes next.
Three engagement lanes depending on where you are. all anchored in technical judgment.
Most teams build what you ask. We build what you actually need. and push back on the rest.
For founders who want a team that thinks like owners, not order-takers.
Your codebase is a liability you can’t see. We audit the decisions that will cost you later and give you a clear plan.
For teams shipping fast who need a second set of eyes before it’s too late.
You’ve got momentum. Now you need a technical partner who can grow with you and tell you what not to build.
For companies doing $500K-$5M+ in revenue who want ongoing leadership without a full-time CTO.
We map your current app, find what breaks at scale, and design the fix. You get a technical roadmap investors trust.
Timeline: 2 weeks.
We rebuild your app foundation to handle 200K concurrent users. React Native + TypeScript for stability. Full error tracking and monitoring.
Timeline: 8-12 weeks.
We implement authentication, encrypt user data, and close security vulnerabilities. You pass SOC 2 and GDPR audits.
Timeline: 4 weeks.
We cut load times from 8 seconds to under 2. We reduce crashes to under 1%. We fix the bugs that kill your ratings.
Timeline: 4-6 weeks.
We document your architecture, write technical specs, and create the materials VCs review during due diligence.
Timeline: 2 weeks.
| Traditional Agency | Vermillion |
|---|---|
| Junior devs learning on your dime | Senior engineers (10+ years) |
| Monthly retainers, no guarantees | Performance pricing, you win, we win |
| Disappear after launch | Hand you trained team, walk away |
| Build what you ask for | Tell you what you actually need |
| Bill hourly forever | Fixed scope, clear timeline |
Let's discuss your mobile app development needs.
We specialize in React Native because it lets you build iOS and Android apps from one codebase. You ship faster. You maintain less code. You scale more efficiently.
Most agencies treat React Native like a website. We build native-quality apps that perform like they were written in Swift or Kotlin.
Let's map out your technical roadmap and timeline.
Start Your ProjectSometimes React Native isn't the answer. When you need maximum performance or deep platform integration, we build native.
We write Swift (not Objective-C). We follow Apple's Human Interface Guidelines. We optimize for every iPhone and iPad. Your app feels like it belongs on iOS.
We write Kotlin (not Java). We follow Material Design principles. We test on real devices, not just emulators. Your app works on Samsung, Google, OnePlus, and everything else.
The question isn't "React Native vs native." It's "what gets you to Series A fastest."
Most of our clients start with React Native. When they raise Series A or B, we help them decide if native makes sense. We've done both paths dozens of times.
We'll help you choose the right approach for your startup.
Your app is only as good as your backend. We build APIs that scale to millions of users using Python, NestJS, or Go.
How we choose: If your team writes TypeScript, we use NestJS. If you need ML or data processing, we use Python. If you need maximum performance, we use Go. Most startups start with NestJS or Python.
We build with Expo because it gives you superpowers other agencies can't match.
You find a critical bug. With traditional apps, you submit to app stores and wait 24-48 hours. With Expo Updates, you push a fix and users get it in minutes.
PicklePlay found a crash affecting 15% of users on Friday night. We pushed a fix via Expo Updates in 20 minutes. By Saturday morning, 98% of users had the update. No app store submission needed.
When we don't use Expo: If you need complex native modules or custom native code, we use bare React Native workflow. But 80% of apps don't need this.
Ship faster and deploy fixes instantly with our Expo expertise.
PicklePlay had 10K users but their app was broken. Crashes hit 30% of sessions. Reviews averaged 2.8★. Poor architecture made every new feature take weeks. Their Series A was stalled, investors saw the crash reports and walked away.
We rebuilt their React Native app from the ground up. Implemented Zustand for clean state management. Built a new Python backend with proper API design. Added Sentry for error tracking and fixed root causes systematically. Optimized database queries that were killing performance. Reduced crashes from 30% to under 1%.
Crash rate:
30% → 0.8%
App rating:
2.8★ → 4.5★
Users:
10K → 200K
Exit:
Acquired by UTR
"Vermillion rebuilt our app in 12 weeks. We went from losing users daily to 200K active users. UTR acquired us shortly after."
- Blake Renaud, Founder, PicklePlay
Ready to scale like PicklePlay?
Get Your Success RoadmapWe audit your app, map problems, and create your rebuild roadmap. You get a technical document that shows investors you have a plan.
We rebuild your infrastructure to handle scale. You get weekly demos showing progress. Your app becomes stable enough to grow.
We optimize performance, write documentation, and train your team. You're ready for technical due diligence.
We hand you a trained team and walk away. You own the code. You know how to maintain it.
Investment: $400K-$600K depending on scope.
Discuss Your TimelineWe're senior engineers with 10+ years experience. We've built apps that raised $200M+. Cheap agencies create tech debt that costs 3x to fix later.
Transparent pricing. No hidden fees.
Interviews, code review, user flows, risk mapping. You get a project brief and technical roadmap.
Wireframes, key screens, API definitions, schema, integrations. You approve before build.
2-week sprints with Friday demos. You test, give feedback, we adjust.
Automated + manual + performance testing on 20+ devices. Prep for app store submission.
Submit to stores, train your team, hand over docs, credentials, infra. You own everything.
Get a customized development plan and timeline.
Request Your PlanAvoid these mistakes. Work with senior engineers.
Talk to Our TeamWe'll show you relevant case studies and technical approaches.
If you nodded at even one of these. let’s talk. The first call is free and there’s no pitch.
Free 15-minute strategy call. No pitch, just clarity.
Most dev shops are order-takers. We review the plan, challenge assumptions, and build with the full picture in mind. You’re not paying for code. You’re paying for judgment that saves expensive mistakes.
That’s fine. We do plenty of straight development work. with one difference: we’ll still flag risks and push back on bad decisions. That’s not an upsell. It’s how we work.
Yes. Start with a free 15-minute strategy call, then choose the lightest engagement that makes sense. Most clients start small and expand once we prove value.
MVP: 8-12 weeks. Full product: 16-20 weeks. Timeline depends on complexity and how fast you make decisions.
Yes. We build both using React Native (single codebase) or native development (separate codebases). We recommend React Native + Expo for most startups.
Yes. We audit your current app, identify problems, and create a rebuild plan. Most apps need significant refactoring before they can scale.
Yes. We offer maintenance plans starting at $8K/month. Or we train your team and hand off completely.
Technical audit, due diligence gap analysis, rebuild roadmap, timeline estimate, and investment breakdown. If we decide to do a Technical Health Check ($7,500), that fee is credited toward your first month.
That's our specialty. We've helped clients pass due diligence and close $27M+ in funding.
Book a free 15-minute strategy call. We'll review your app, surface the biggest technical risks, and outline a realistic roadmap and timeline.
No pressure. No sales pitch. Just honest advice from engineers who've done this 40+ times.
Book Free 15-Min Strategy CallIf we decide to do a Technical Health Check ($7,500), that fee is credited toward your first month.