Beschreibung

I'm Leon, a mobile app developer and solo founder from Germany. I ship production Expo / React Native apps and specialize in solving complex technical problems in existing mobile applications.

I typically help with:

• Fixing difficult Expo / React Native production issues

• iOS / Android build & release debugging

• Performance bottlenecks and memory issues

• Offline-first architecture & sync design

• Subscription / RevenueCat integration

• App Store / Play Store rejection fixes

• Complex navigation and state architecture

• Media upload pipelines (video, images, background processing)

• Cloudflare / serverless backend integration

My focus is deep technical problem solving and short, well-defined engagements where experience matters.

Technical background:

• Expo / React Native (production apps on App Store & Google Play)

• TypeScript

• Expo Router & complex navigation

• Offline-first architectures (SQLite, MMKV, sync systems)

• Cloudflare Workers / serverless backends

• GraphQL & REST APIs

• RevenueCat & in-app purchases

• Push notifications

• Media processing pipelines

• Performance optimization

If you have a specific production issue or architectural challenge, I can usually help quickly.

Sprachen

Deutsch
Muttersprachlich oder zweisprachig
Englisch
Verhandlungssicher

Arbeitsortpräferenzen

Nur remote

Führt Projekte hauptsächlich remote aus

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MaibornWolff GPT: Internal GPT Platform and AI Agent
April 2025 - August 2025 (4 Monate)
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Build, deployed internal GPT platform (self hosted ChatGTP clone) in a team with three other engineers to push t copanies transformation to an AI-first approach. We also build a company LLM agent that had access to internal documents and could answer questions to employees based on this data.
Microsoft Azure Retrieval-Augmented Generation (RAG) LLMs AI Agents
ClimbTag
Founder and Developer
März 2025 - Heute (1 Jahr und 3 Monate)
Berlin, Deutschland
Built a production mobile app used in climbing gyms to log boulder ascents via QR tags. Includes offline logging, gym-scoped sync, video uploads, and a serverless Cloudflare backend. Focus on performance, scalable architecture, and real-world usage.
Software Architektur Expo React Native Cloudflare Local-First

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Bachelor Computer Science
Technical University Munich
2022
Master Computer Science
Technische Universität Berlin
2026

Leon Jünemann

Expo / React Native Expert, Cloudflare Expert

Über Leon

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