Product development
Apps from first version through production: UI, APIs, data, and the pieces around them.
- Frontend and authenticated apps
- Backend, APIs, and database design
- Payments and third-party integrations
- Deploy and hosting
Vilhelm Martinsson
Full-Stack Engineer · Sweden
I build production-ready web applications, real-time systems, and practical AI features for startups and small teams. Based in Karlstad, Sweden.
Services
Real-time systems
Live updates, background work, and long-running jobs that need to stay reliable.
- WebSockets and live browser updates
- Background jobs and scheduled tasks
- Long-running processes with progress
- Queues and async workflows
AI integrations
AI inside real products when it clearly helps, with cost and production in mind.
- LLM APIs and workflows
- Automation and content handling
- Drafting and regeneration in product flows
- Production cost and reliability
How I work
Most of my work takes one of two forms: a bounded project or an ongoing retainer. Either works for me. What matters is that we align early on what "done" means and how we stay in sync when the scope or priorities change. I work primarily remote.
Project work
A clear goal with a clear end: an MVP, an internal tool, or a defined piece of a product. I scope it, build it, and hand over something that runs in production.
Ongoing / retainer
A set amount of time each month for features, fixes, and whatever comes up. Useful when you need steady engineering help without hiring full time yet.
In both cases I own the technical decisions and the implementation. I use AI coding tools as leverage in day-to-day development. They speed things up, but the judgment stays with me. If a product needs AI features, I add them when they clearly help users, not by default.
Technologies
Backend
Python, Django, Django REST, PostgreSQL
Frontend
JavaScript, Vue.js, Nuxt.js
Real-time & Infrastructure
Django Channels, WebSockets, Celery, Linux, Nginx
Integrations & APIs
Stripe, Mailgun, OpenAI, Claude
Clients
Production systems and products I built for clients, from first scope to launch.
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SRS Regatta
Sailing race management for clubs: series and events, competitors, results, and role-based access for owners, admins, and members.
Django · DRF · Djoser · Channels · Redis · PostgreSQL · Nuxt
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Webbstream
Internal platform for multi-site content operations: WordPress publishing, AI-assisted drafting, webhooks, scraping, and long-running Celery jobs with live progress over WebSockets.
Django · DRF · Celery · Redis · PostgreSQL · Channels · Vue
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Grannkampen
Live quiz MVP: join by code, timed rounds, real-time scoring over WebSockets, scheduled starts, and Swish payouts for prizes.
Django · DRF · Channels · Celery · Redis · PostgreSQL · Nuxt
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Hälsoförmedlingen
Marketplace MVP for a Swedish health startup: categorized inquiries, partner matching and alerts, and orders tied to those inquiries.
Django · DRF · Djoser · PostgreSQL · Vue · Mailgun
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Franke
Frontend demo for a kitchen worktop configurator: drag-and-drop 2D layout, live measurements, and quote generation.
HTML · CSS · JavaScript
Testimonials
"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