Product development
Web apps from early version to production: UI, APIs, data, and deployment, for startups and small teams.
Vilhelm Martinsson
Full-stack engineer · Sweden
Freelance software engineer based in Karlstad. I build web apps and real-time systems for startups and small teams.
Services
Real-time systems
Live updates, queues, and long-running jobs that stay reliable when users are waiting on them.
AI product features
AI wired into real product flows: agents, generation, automation, built for cost, latency, and failure.
How I work
Two ways to work together: a scoped project with a clear end, or a monthly retainer for ongoing capacity. Short path from idea to production. 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. Steady capacity without a full-time hire, with room to shift when priorities change.
I use AI tools to move faster. I still direct the architecture, weigh design tradeoffs, and review what goes to production.
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
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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 drafting, webhooks, scraping, and background jobs with live progress.
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
Interactive kitchen worktop configurator with drag-and-drop 2D layout, live measurements, and on-the-fly 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