iOS and Android apps in React Native, Flutter, Swift and Kotlin — with hardened APIs, secure on-device storage, and a penetration test before store submission. A mobile app development company for startups and enterprises in France and the United States.
Evosec Consulting designs and builds iOS and Android mobile applications for fintech, health, marketplace, logistics and consumer brands. Most of our mobile clients come to us for one of two reasons: they need a senior team that can ship an MVP fast, or they have an existing app that failed a security audit and need people who can both fix it and prove it's fixed.
We are one of the few mobile app development companies with an in-house offensive security team. Before any build goes to TestFlight or Play Console, our pentesters attack it the way a real adversary would — insecure storage, API authorisation, certificate pinning, reverse-engineering resistance — and the developers fix what they find.
One TypeScript codebase for iOS and Android, sharing logic with your Next.js web app. Our default for startups that need to move fast without doubling their engineering surface.
Pixel-identical custom UI, heavy animation and 60fps performance across platforms. Ideal for consumer brands where design fidelity is the product.
Swift and Kotlin when the product depends on the platform: HealthKit, CarPlay, background Bluetooth, NFC payments, AR, or the highest security assurance.
Laravel or Node.js backends purpose-built for mobile: token auth with refresh rotation, push notifications, offline sync, rate limiting and abuse protection. See web development.
Already have an app? Our security team tests it against OWASP MASVS / Mobile Top 10 and delivers a prioritised report — with the option of our developers fixing the findings.
Certificates, listings, privacy labels, Data Safety forms, review responses, phased rollouts, crash monitoring and post-launch maintenance under SLA.
| Choose… | When | Typical MVP |
|---|---|---|
| React Native | Your team knows React/TypeScript · you share code with a web app · you need to iterate weekly | 8–12 weeks |
| Flutter | Custom, animation-heavy UI must be identical on both platforms · design-led consumer product | 8–12 weeks |
| Native Swift / Kotlin | Deep platform integration (Health, CarPlay, BLE, NFC) · maximum performance and security assurance | 12–16 weeks |
A cross-platform MVP (iOS + Android from one codebase) typically costs $25,000–$60,000 (≈ 23k–55k €) and ships in 8–14 weeks. Apps with native modules, offline sync, payments, KYC or medical-grade data handling range from $60,000 to $200,000+. Every project is fixed-price per milestone and includes a mobile penetration test before store submission.
React Native when your team already knows React/TypeScript or you share code with a web app; Flutter for pixel-identical custom UI and heavy animation. Native Swift/Kotlin when the product depends on deep platform features.
Yes — certificates, provisioning, listings, privacy labels, Data Safety forms, review responses and phased rollouts. RGPD consent flows for French clients; CCPA and HIPAA considerations for US clients.
Our in-house pentesters test every build against the OWASP Mobile Top 10 before release, and the developers who wrote the code fix the findings. No hand-off, no second vendor.
Yes. Nearshore partner for French startups and SMEs (Paris time, French-speaking, RGPD-first); senior remote team for US companies with a daily East Coast overlap window. EUR or USD invoicing.