Led escalations across 4 remote engineering teams, cutting response time from 6.8 to 1.3 days and open escalations from 30+ to 10–12.

Retained $2M+ in monthly recurring revenue (MRR) by owning high-stakes enterprise accounts end to end — diagnosing root causes in code, de-escalating in business language, and translating needs into engineering roadmaps.

Guided the platform migration from legacy FUSE to Apple FileProvider framework — shipped to production at enterprise scale.

Built macOS FinderSync extension (Objective-C) for real-time sync status indicators and custom context menus.

Architected offline sync via ZeroMQ / JSON-RPC 2.0 microservices; introduced CQRS to core network layer, boosting upload throughput.

Modernized kernel→system extensions with code-signing CI/CD, and migrated app stack: UIKit→SwiftUI, ObjC→Swift, dispatch queues→async/await.

Awarded Teamplayer of the Year ×2 for cross-functional alignment across product, engineering, and customer success.

Lead iOS dev on HandyTicket Deutschland and KVB mobil — public-transit ticketing apps serving 2+ million daily riders across Germany.

Architected, designed, and developed multiple APIs for each regional transit network.

Led and mentored a cross-functional development team, optimizing productivity through delegation.

Founded iOS development studio; built and shipped white-label iOS applications.

Full-stack developer for Fellows and Kalkulator — Java, PostgreSQL, PrimeFaces, JavaScript web applications with CI/CD pipelines (Jenkins).

Developed iOS and Android mobile apps for law firms (CasusSoft).

Front-end development for energy-sector operations management platform (Syndis OMS) using AngularJS and ReactJS.

Developed iOS apps for Standard Bank (Africa's largest), BCI Directo (Mozambique), and Millennium Bank (Poland) — high-compliance financial environments.

Developed iOS app for Lusiadas hospital group.