Tobias Reinsch

Work

Experience

  1. eos.uptrade

    2022–now

    Senior iOS Engineer

    iOS for a ticketing platform. Architecture decisions that are shared across several teams, and location-based features where timing and correctness matter.

  2. Wolters Kluwer

    2018–2022

    Senior Product Software Engineer

    Mobile engineer in the product team behind ADDISON OneClick, a tax platform used by accounting firms across Germany. Owned the iOS and Android side, including the OneClick Scan app.

  3. DMFS

    2014–2018

    Android & iOS Developer

    Calendar and task apps in a small team: CalDAV sync, offline-first storage, and OpenTasks, an open-source task manager for Android.

  4. SAP

    2011–2013

    Working Student, Diploma Thesis

    Mobile prototypes for connected-car concepts, then a thesis on crowdsourced indoor navigation: an iOS app with a backend on SAP HANA Cloud Platform.

  5. AppTastic

    2012

    Mobile Development Intern

    iOS and Android apps for client projects at a mobile agency, plus backend work with ASP.NET and Parse.

Projects

  • Nuff (external link)

    2026

    A climbing logbook for Saxon Switzerland: log ascents, find summits and routes, and tick off peaks on a map. Offline-first with a local SQLite database that syncs when the network is back. In early access for iPhone and Android.

    React Native, Expo, TypeScript, SQLite, Supabase

  • Contractly (external link)

    2026

    A small web app for keeping track of personal contracts. Data stays on the device; there is no backend.

    PWA, SvelteKit, TypeScript

  • OneClick Scan (external link)

    2021

    Receipt scanner for accountants and their clients. Detects and crops documents automatically, works offline and syncs in the background. Native on iOS and Android.

    Wolters Kluwer · SwiftUI, Jetpack Compose, SQLite, Document detection

  • ADDISON OneClick (external link)

    2018

    Collaboration apps for accounting firms and their clients: shared documents, tasks and real-time chat. Native on iOS (Swift, UIKit) and Android (Kotlin, Java), from the first version onwards.

    Wolters Kluwer · Swift, UIKit, Kotlin, Java

  • Webcal Sync

    2014

    Subscribe to and sync iCal and webcal calendars on Android, with a built-in store of public calendars. Designed and built from scratch. No longer on Google Play.

    DMFS · Android, Java, iCalendar, Webcal

  • OpenTasks (external link)

    2014

    Open-source task manager for Android with CalDAV sync. I redesigned and improved it, moving it to Material Design shortly after Google introduced it.

    DMFS · Android, Java, Material Design, CalDAV, Open Source

All projects

Skills

iOS
Swift, SwiftUI, UIKit, Swift Concurrency, SwiftData, Instruments
Android
Kotlin, Jetpack Compose, Java
Architecture
TCA, MVVM, Modularisation, Dependency injection, Offline-first sync, CalDAV
Delivery
XCTest, JUnit, Snapshot tests, Fastlane, GitLab CI, Crashlytics
AI tooling
Agentic coding workflows, Review and test strategy for generated code
Also
TypeScript, React, Astro, SvelteKit