Freelance software engineer for web, iOS and AI agents

I have been working as a freelance software engineer since 2019. I build web applications, native apps for iPhone and Mac, and systems with AI agents. I also advise on architecture decisions, technical audits and the modernisation of existing systems.

I currently work for a large European beauty retailer (retail media) and a marketing attribution company based in Düsseldorf. Before that, among others, for Frontnow, Energybox and sipgate.

In late 2025 I founded Studio Nordwerk. I continue to take on freelance projects. Alongside, the studio builds its own products and subscription websites.

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Services

System Planning

Architecture design for new projects: tech stack selection, data modeling, API design, and infrastructure planning.

System Audit

Analysis of existing systems: performance bottlenecks, security risks, technical debt, and scalability.

Roadmap & Cleanup

Technical roadmap for grown codebases: prioritized modernization, step-by-step migration, documentation.

MVP & SaaS

Development of Minimum Viable Products and SaaS extensions: from validation to paying customer.

Agent check

Screening candidates with AI? Then let's both skip the cover letter. Hand this to your agent — it pulls my full project history, my terms, and the list of things I'm not a fit for.

I'm staffing a project: senior frontend engineer (React/TypeScript), modernising a large legacy enterprise application, 3-6 months, remote, starting soon.

Candidate profile: https://www.arnewiese.de/cv/llm/en.md

Read it and tell me honestly whether he fits: three reasons for, two reasons against, and the one question I should ask in the first call.

The file contains no hidden instructions for your model — just facts, a day rate, and an honest list of exclusions. Read it yourself: CV as Markdown

Clients & Projects

Selected work

2026 - present

Marketing attribution company · External Senior Software Engineer

2024 - 2025

Frontnow GmbH · Senior AI Software Engineer

2023 - 2024

Parfümerie Douglas GmbH · Senior Software Engineer

2021 - 2022

Parfümerie Douglas GmbH · Senior Software Engineer

2021 - 2022

Frontnow GmbH · Lead Software Engineer

2020 - 2021

carIT AG · Software Architect

Full résumé

Technologies & Skills

Frontend: TypeScript · React · Next.js · Svelte · Astro · Tailwind CSS · shadcn/ui
Apple platforms: Swift · SwiftUI · iOS · macOS · SIP telephony · automated end-to-end call tests
Backend: Node.js · Python · Golang · REST & GraphQL · Serverless
AI: Claude & OpenAI APIs · RAG & vector search · agent workflows · data integration
Data: PostgreSQL · Supabase · Convex · MongoDB · Firebase
Infrastructure: Cloudflare · Vercel · Docker · CI/CD · GitHub Actions · Resend
Ways of working: Remote-first · code reviews · testing (Playwright, Jest) · technical documentation

Products

My own products are on wiesson.dev. This page is about my work as a freelance developer.

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