Senior mobile developer focused on React Native / Expo, working as an independent contractor through PSYDEV, a software development company I founded and run together with one other developer. I currently provide ongoing services to Inova e-Business, working on mobile products in production — from architecture and the New Architecture to error monitoring and performance at scale.
Besides client work, I run my own home lab (Xeon server, self-hosted Sentry, infra automation) and write about React Native on my Medium blog.
- 🔭 Currently working on React Native/Expo apps in production (bare workflow, New Architecture, EAS Build/Update)
- 🏢 Co-founder of PSYDEV Desenvolvimento de Softwares, providing services to Inova e-Business
- 🌱 Exploring self-hosted infrastructure, observability (Sentry), and local AI (LM Studio)
- 💬 Open to new contracts and partnerships as an independent contractor
- 📫 Reach me at: vr.petrachin@gmail.com
Mobile
Backend & Infra
DevOps & Observability
React Native apps live in the app stores, built for clients served through PSYDEV/Inova e-Business:
| Project | Description |
|---|---|
| Vibe Benefícios | Cashback and loyalty app (Vertem group) with 250+ partner brands, including Nubank, Natura, Netshoes, Domino's, Shell, Cinemark, Cineart, Sadia, and Perdigão. |
| Unigloves | App/platform for Unigloves, a manufacturer of PPE (gloves and safety equipment). |
| Imigrantes Bebidas | Mobile e-commerce/delivery app for the Imigrantes Bebidas beverage distribution chain. |
| Gooroo Crédito | Mobile app for private payroll-deductible loans (CLT employees) — the client previously operated only through a website; the app brought the full loan application journey to mobile. |
| Clube do Ingresso | Mobile app for event ticket sales. |
| Revista Oeste | Mobile reading/subscription app for Revista Oeste. |
| vikinger-panel | Open-source web panel for self-hosting a Valheim dedicated server via Docker — manages worlds, mods, and backups without touching the command line. |
| Portador IB | React Native/Expo app in production with a Supabase backend, Firebase Crashlytics monitoring, and a dual logging architecture (Sentry + Supabase). |
| Manei API | NestJS + MongoDB + Redis API running on Docker, built with Spec-Driven Development and JWT authentication segmented by client type. |
| inova-feature-flag | React and React Native library for configuring and accessing feature flags. |
All client work above was built and shipped as production apps — the repositories themselves are private under client contracts (owned by the companies or by Inova e-Business). Happy to walk through architecture, code samples, or results under NDA or in an interview.
I maintain my own infrastructure to test and validate solutions before shipping them to production for clients:
- Server: Xeon E5-2680 v4, 32GB DDR4, Ubuntu Server 24.04 — hosts self-hosted Sentry and network services via Cloudflare Tunnel
- Dev machine: Mac Mini M4 / i9 10900 + 32GB DDR4 + RX 6900 XT
- Hands-on experience with CI/CD (GitHub Actions), OTA updates (EAS Update), and error triage for mobile apps in production
Open to talking about new projects, consulting, and contract work. Reach out via email or LinkedIn!