VILHELM MARTINSSON
Full-Stack Web Developer / AI Engineer
Hands-on builder and strategic partner. Available as a Project Consultant or Fractional Tech Lead to take your product from prototype to production.
Let's build.
Whether you're launching an MVP, scaling a prototype, or building critical features, different situations call for different approaches, from hands-on coding to strategic thinking. I work with companies in two flexible ways:
Project Consultant: When you have a clear scope and timeline. I deliver focused, hands-on development for defined projects or critical feature launches, from design to production deployment.
Fractional Tech Lead: When you need ongoing technical leadership without full-time overhead. I combine active coding with architecture decisions, roadmap planning, and AI integration.
Both models share the same principles: clear communication throughout, thoughtful solutions, and a focus on what you actually need, whether that's a quick prototype or a full-scale system.
ultimate sophistication."
About
I'm Vilhelm Martinsson, based in Karlstad, Sweden, working with founders globally. I've helped launch products and MVPs from concept to production.
I work directly with founders and non-technical teams, communicate clearly, and deliver production-ready code on time. If you're ready to turn your idea into a real product, let's talk.
Services
Full-Stack Web Development
Complete web applications with frontend, backend, and APIs.
- Frontend development and UI
- Backend services and APIs
- Database design and management
- Full-stack application development
AI Engineering
Integrate AI into products and workflows.
- LLM fine-tuning and evaluation
- AI model integration and deployment
- MLOps and production systems
- AI-powered tools and workflows
Fractional Tech Lead
Your part-time engineering partner from prototype to production.
- Core architecture and roadmap
- Hands-on coding and delivery
- Technical strategy and planning
- Product and technical alignment
Blog
A place to scribble down my thoughts and ideas, while diving deeper into subjects that spark my curiosity. It will be a mix of personal and professional notes on a wide range of topics.
Loading posts from Substack...
Technologies
I work primarily with technologies such as Python, Django, Flask, Django-Rest, Django-Channels, Websockets, Javascript (ES6+, Node, Vue.js, Nuxt.js), PostgreSQL, HTML5, CSS3, SQL, JSON, Git/Github, Heroku, Digital Ocean (Droplets and App Platform), Stripe, Mailgun, Nginx, Gunicorn, Linux (Ubuntu), OpenAI, Claude, AI model integrations, Cursor etc.
Customers
is a soaring exercise
of the human imagination."
Reviews
"Vilhelm has been helping us develop a custom content management system using Django, Django REST, Celery, and third-party APIs. It allows us to manage multiple sites, schedule articles, and generate images with ease. The ongoing, iterative approach has been smooth, and we're very pleased with the result."
- Anders Gärme, Webbstream"Vilhelm developed our MVP for a live, local quiz competition, covering both front and back end, and enabling players to compete for cash prizes with Swish payments. The development process has been efficient, and the final product meets our needs perfectly."
- Andreas Asplund, Grannkampen"Vilhelm has helped us with everything from requirements, design, development and implementation of our web application. The collaboration has been very good from start to finish and the project was delivered according to plan!"
- Linus Lindeborg, Hälsoförmedlingen