_I develop ahead/*
Agentic engineeringfor full-stack web & mobile.
I'm Marco Kruse, a freelancer and full-stack developer with 10+ years in TypeScript, React, Next.js, Node.js and Java. Inside your team or as your project partner, without agency overhead.
Let's talk
devahead is Marco Kruse. One engineer, amplified by AI agents.
I build web and mobile products across the whole stack: frontends with React and Next.js, apps with React Native, backends with Node.js, Hono and Spring. From enterprise platforms at AXA, About You and Eurowings to my own app Baller Manager.
I've worked agentically since the first coding models could write useful code: first with Cursor, today mostly with Claude Code and OpenCode. The agents handle the volume; I own the architecture, the reviews and the quality.
I'm a freelancer: bring me into your team through contracting, or book me as a project partner for an entire project. Either way, you talk directly to the person who writes the code. No account managers, no handoffs.
How I work with agents
- Taste, taught to agents
- Agents write code fast. Taste decides whether it's good. Mine comes from more than ten years of building products, and I pass it on to the agents through design systems, skills, rules and reviews.
- Code for humans and machines
- Clear structure, explicit types, documented decisions: code that your developers and AI agents understand equally well, today and years from now.
- Consistency in design
- One pattern per problem, across the whole stack. Every new feature fits in, whether a person or an agent wrote it.
- Testable, maintainable, scalable
- Tests are the guardrails for agent-written code: what doesn't pass them doesn't get merged. The codebase grows without breaking and stays easy to maintain and extend long after I've moved on.
Freelance developer as contractor or project partner. I build what your team can carry forward.
- Contracting
- I work as part of your team, in your tools and sprints, and bring in agentic workflows your team keeps using after I leave.
- Project partner
- I deliver a project end to end, from architecture to production, and hand it over to your team fully documented.
I introduce Claude Code, OpenCode or Cursor to your team, with the rules, tests and reviews that make agents ship reliable code.
AI coding agents only pay off when the codebase and the team are ready for them. I set up Claude Code, OpenCode or Cursor in your repositories, write the conventions agents need (AGENTS.md, CLAUDE.md, skills, project rules), and make sure tests, linting and CI give them fast, honest feedback. Together with your developers I establish review practices for agent-written code and work in pairing sessions until the workflow sticks. If you have an AI idea for your product, I turn it into a prototype with real data so you can decide before investing big.
Let's talkWeb applications with React, Next.js and TypeScript: SaaS platforms, e-commerce, portals and internal tools.
I build web applications across the whole stack: React, Next.js and TypeScript on the frontend, with a backend and database that fit the product. That ranges from SaaS platforms with payments and e-commerce like About You and MediaMarkt to dashboards and internal tools. I plan for WCAG accessibility and performance from the start, not right before launch.
Let's talkiOS and Android apps from one codebase with React Native and Expo, with a web version if you need one.
I build iOS and Android apps with React Native and Expo: one codebase, two stores. My own app Baller Manager runs on iOS, Android and the web, and shows this stack delivers production-ready apps. Over-the-air updates shorten release cycles, and logic can be shared with your web platform.
Let's talkREST and GraphQL APIs with Node.js, Hono or Spring, plus CI/CD and cloud infrastructure on AWS, GCP or Vercel.
I design REST and GraphQL APIs that are documented and easy to integrate, with Node.js, Hono or Java/Spring and databases like PostgreSQL or MongoDB. That includes CI/CD pipelines with GitHub Actions or GitLab, Docker, and infrastructure as code on AWS, GCP or Vercel. Builds, tests and deployments run automatically, so your team ships without manual steps.
Let's talkI modernize legacy systems step by step, without interrupting your business.
Your legacy system works, but it's holding you back. I modernize applications step by step: monoliths become micro-frontends, outdated frameworks give way to React and Next.js, manual deploys turn into CI/CD pipelines. Agents help analyze old code, write tests as a safety net and take over repetitive migration steps. You keep running while I rebuild, with no big-bang migration.
Let's talkProjects/*
References from startup to enterprise. From AXA to Wundermobility.
Platforms with millions of users and MVPs that need to go live fast. My two latest projects are built agentically: my own product and the rebuild of an enterprise document platform.
AXA
Insurance
Recurring partner of AXA Switzerland: from the pattern library to the complete rebuild of the company-wide document platform.
- Document platform rebuild with an open-source PDF viewer instead of licence lock-in
- Successful 2025 modernization led to the contract for the complete rebuild
- Offer system migrated from JSF to React microfrontends, 2,000+ users
- Pattern library with Web Components, used by 15+ teams
More projects
- About YouFashion E-Commerce
- Full platform relaunch in 4 months
- EurowingsAviation
- Accessible web platform (WCAG 2.0 AA)
- MediaMarktRetail & E-Commerce
- Frontend development for the online shop
- SchülerhilfeEdTech
- E-learning platform with React and AWS
- WundermobilityMobility
- E-scooter data analysis tool with Mapbox
- Luca AppPublic Health
- Stabilization & feature development for a 30M-user platform
A tech stack for web, mobile and backend. Proven in production.
- Languages
- JavaScript
- TypeScript
- Java
- Frameworks
- React
- Vue
- Next.js
- Spring
- Quarkus
- Mobile
- React Native
- Expo
- Libraries
- TanStack (Router, Query, Form, Table)
- Tailwind CSS
- Material UI
- GraphQL
- Redux
- Runtime & Infrastructure
- Vite
- Storybook
- Node.js
- Bun
- MongoDB
- MySQL
- PostgreSQL
- Docker
- AWS
- GCP
- GitHub
- GitLab
From requirements to release: how a project with me works.
Analysis & Goals
- We clarify which problem we're solving and how we'll measure success
- I challenge requirements and prioritize by value
- Technical concept and effort estimate
Agentic Setup & Plan
- A repository with AGENTS.md, tests and CI before agents write any code
- Roadmap with milestones for the first iteration
Development in Iterations
- Agents write code; I own the architecture and review every change
- Automated tests and security checks in every pipeline
- Regular test builds so you can give feedback early
Release & Handover
- Automated deployments to test and production environments
- Documentation and handover so your team can carry on without me
What to know about freelancing & agentic engineering
What is agentic engineering?
In agentic engineering, AI agents like Claude Code write much of the code, directed by an experienced engineer. I set the architecture, rules and tests, review every change and own the result. You get more software in less time without cutting corners on quality.
How do we work together: contracting or a project?
Either works. As a contractor I join your team, work in your tools and processes, and bring in agentic workflows. As a project partner I take on a project end to end, from requirements to release, and hand it over to your team fully documented.
How do you ensure the quality of AI-generated code?
I treat agent-written code like any other code: it has to pass tests, linting and type checks in CI, and I review every change before it's merged. Rules in AGENTS.md and skills keep agents following the project's patterns instead of inventing their own.
Who owns the code, and how is it kept confidential?
I work in your repositories, and we settle the rights to the code in the contract upfront, whether a person or an agent wrote it. We also agree upfront which AI tools and accounts are used in your project, in line with your confidentiality and data protection requirements.
How long does a typical project take?
It depends on scope. An MVP or proof of concept can be ready in 4 to 8 weeks. Larger platforms or modernization projects run iteratively over several months, with a usable result after every iteration.
Do you work alone and remotely?
Yes. Behind devahead is me, Marco Kruse, and I do the work myself, supported by AI agents. I work remotely from Switzerland for teams in Switzerland, Germany and worldwide, in German or English. You get one point of contact and no agency overhead.
Contact/*
Tell me about your project. I reply personally.
Looking for a freelance full-stack developer for your project?