Bohdan M.

Senior iOS engineer with 9 years shipping production apps — 6 of them on connected hardware: BLE/IoT companion apps, energy monitoring, and security products (CoreBluetooth, background modes, reconnection state machines, battery-aware sync). What I bring: Swift 6 and structured concurrency (actor-based migrations of legacy codebases), SwiftUI + UIKit, clean modular architecture, CI/CD (GitHub Actions, Bitrise), XCTest/Swift Testing. I work daily with AI-assisted tooling (Claude Code, Cursor) and can show how I keep it honest with tests and reviews. On Upwork: $40K+ earned, 2,600+ hours, 100% Job Success — all long-term engagements with repeat clients. I prefer clear written communication, async-friendly, EU timezone (Warsaw). Good fit for: BLE/IoT apps, SwiftUI migrations, performance and stability fixes, taking over an existing codebase, App Store release work.