We turn "almost done" into shipped. Senior Mobile + Backend engineering focused on Crash Reduction, Payments Reliability, and Production Performance.
Most agencies are great at starting. We are experts at finishing.
Deep dive into crash logs, API latency, and payment failures. We tell you exactly why your users are churning.
Explore AuditWe fix the broken integrations (Auth, Push, Subscriptions) and get your build green for the App Store.
See ProcessComplex features for iOS (SwiftUI) and Flutter. We build the hard stuff that requires senior architecture.
Our StackWe don't just talk. We fix critical production issues.
Investigated & fixed duplicate payment race conditions. Optimized API caching strategy for millions of daily requests.
Achieved 3x performance gain and 99.9% app stability. Successfully integrated Apple Pay driving ~7% revenue lift.
Executed critical Django migration (1.6 → 1.7) for production archives without data loss or downtime.
Architected "GoGrocer" and "GoFresha" ecosystem. Complex multi-vendor logic shipped to thousands of developers.
We don't chase hype. We build on battle-tested, enterprise-grade frameworks that scale to millions of users.
Production-grade systems, shipped safely.
iOS + Firebase
Cloud Functions v2 backend, App Check security, encrypted Plaid tokens with Secret Manager. Implemented RevenueCat, Crashlytics, RBAC admin panel, and full CI/CD pipelines.
Flutter Migration
Complete migration to Flutter for iOS/Android/macOS. Refined UX, added admin functionality, push notifications, and complex bill/rep tracking modules for Phase 2 expansion.
Production workflows
Stabilized production workflows with a focus on reliability and execution. Implemented production-safe improvements and shipped under real-world constraints.
Verified 5-Star Reviews from Upwork
"Carlos is an absolute professional. He came in, diagnosed our crash issues immediately, and had a fix deployed within 48 hours. The stability roadmap he provided was a game changer."
"We needed a senior engineer who could handle a complex migration without breaking production. Tecmanic delivered perfectly. Highly recommended for high-stakes work."
Stop losing users to crashes and slow load times. Let's stabilize your build.