Software Engineer • Open-Source Maintainer
I build and maintain production-grade tooling for location services and clean architecture — from mobile SDKs to backend mediation systems.
Focused on Background Location, Reliable Mobile Data Capture, and High-performance .NET Messaging.
Reliable background location tracking for React Native mobility, logistics & field-ops apps Android-first with crash recovery, SQLite persistence (Room), and real-time updates.
✔ Crash recovery & state restoration stored via Room DB
✔ High-accuracy GPS + full location metadata support (10+ props)
✔ Real-time updates via native event emitters
✔ Hooks-first API w/ TypeScript (98% coverage)
✔ Production CI/CD automation (beta + stable release channels)
📦 npm: https://www.npmjs.com/package/@gabriel-sisjr/react-native-background-location
🔗 GitHub: https://github.com/gabriel-sisjr/react-native-background-location
High-performance mediator for .NET — clean CQRS, Requests/Commands/Notifications with zero dependency overhead
✔ Fast delegate execution (no reflection path on hot code)
✔ Automatic handler discovery across assemblies
✔ Native DI integration (clean DDD boundaries)
📦 Core: https://www.nuget.org/packages/Coordix
🔗 Repo: https://github.com/gabriel-sisjr/Coordix
• In-process queue using System.Threading.Channels
• Background worker w/ scoped lifetime handling
• Ideal for email, logging, 3rd-party calls, async workflows
📦 https://www.nuget.org/packages/Coordix.Background
• Source generators for handler discovery + registration
• Eliminates manual wiring & reflection codepaths
• Faster builds, safer refactors, better DX
📦 https://www.nuget.org/packages/Coordix.CodeGen
• Mobile SDKs that survive crashes, restarts & long-running ops • Data persistence strategies optimized for Android real-world usage • Distributed/event-driven design in .NET • CI/CD automation that ensures stability and trust
Companies rely on my work to keep field teams and mobility apps running. If your business depends on location quality — let’s talk.
📬 Email: gabriel.sistemasjr@gmail.com
🔗 LinkedIn: https://www.linkedin.com/in/gabriel-sisjr/