Vladislav S.Private profile: Upwork shows its earnings only to signed-in members, so we check it every few weeks, not daily. MRR here is a rough estimate (Upwork's six-month earnings ÷ months active). Last read Nov 5, 2026.

I build Android and iOS apps that communicate reliably with real hardware: BLE, USB, NFC/RFID, and MQTT/IoT devices. Recent Upwork work includes nRF BLE/NUS validation, Cordova USB recovery, RFID readers, and connected-device debugging. My strongest area is mobile software that has to work reliably beyond the screen — with physical devices, vendor SDKs, native APIs, background services, network protocols, and real-world connection failures. Recent work includes: • BLE / Nordic nRF integration — GATT/NUS communication, bonding, notifications, command handling, ACK/NACK flows, reconnect behavior, and structured diagnostics • Android USB integrations — RFID readers, receipt printers, barcode devices, USB permission handling, hot-plug recovery, service lifecycle, bus reset recovery, and Android 13+ compatibility • NFC / RFID — reader integration, device lifecycle management, power-state recovery, and reliable scanning workflows • IoT / MQTT — TLS-secured MQTT communication, device commands, telemetry, QoS handling, reconnect logic, local encrypted storage, and offline-aware application workflows • Native Android and iOS — Kotlin, Java, Jetpack Compose, Swift, SwiftUI, REST APIs, local databases, background processing, media/audio workflows, and App Store / Google Play delivery • Cross-platform and native bridges — Capacitor, Cordova, Flutter, and Kotlin Multiplatform when a project requires native platform or hardware access I also work on products involving audio processing, native C++/DSP integration, healthcare workflows, GPS/location, media capture, PDF/report generation, and backend-connected applications. For connected-device projects, I focus heavily on failure modes that often cause production issues: permissions, pairing, reconnects, timeouts, stale connections, lifecycle transitions, background execution, device detach/reattach, retries, protocol validation, and useful diagnostics. I’m a good fit when you need to: • integrate a BLE, USB, NFC/RFID, or IoT device with Android/iOS • debug an unreliable existing hardware integration • build a mobile companion app for a connected device • stabilize a native plugin or vendor SDK integration • extend or modernize an existing Android/iOS application • investigate difficult lifecycle, communication, or device-state bugs My workflow is practical: understand the failure → reproduce it → add diagnostics → isolate the cause → implement a testable fix → verify recovery and edge cases. You receive clear progress updates, early risk reporting, reproducible builds, structured diagnostics, and maintainable source code throughout the project.