I am Lasse

About me

Full-stack developer with over 15 years of experience planning, architecting, and building web and mobile apps, with a frontend focus. Beyond technical expertise, I have helped grow startups into successful businesses and learned many of the valuable ins and outs of that process.

I provide the technical and business expertise to bring your projects and ideas to life. I have a good eye for UX/UI, am a strong problem solver, and strive to write high-quality code—simple, testable, and maintainable. I welcome challenges and the chance to work with new technologies and people.

I have worked extensively with various AI technologies since OpenAI released GPT-3. I know how to optimize, search, and apply AI to business and development processes to solve real problems.

When leading teams, I value results over processes, personal responsibility over micro-management, and innovation over dictates. I adhere to the principles behind the infamous Agile Manifesto.

Read a few of my thoughts on what's important for ensuring good architecture.

I speak Danish, German and English.

📍Based in Copenhagen.

Technologies

I work across the modern TypeScript stack, with React at the center and strong experience spanning frontend architecture, APIs, data modeling, testing, and delivery.

The list below is representative rather than exhaustive, but it covers the technologies I use most often and can step into quickly across the React and TypeScript ecosystem.

Projects

Selected projects I built and/or was part of:

• Developed and architected native mobile and web app for the delivery service using React (Native), TypeScript, GraphQL and Storybook. Additionally I tutored teammates.
  Customer: alpakas.app
  Url: alpakas.app
  Date: 2022 - 2022.
• Developed native mobile app for a crypto bank using React Native, TypeScript and GraphQL.
  Customer: nuri.com
  Url: nuri.com
  Date: 2021 - 2021.
• Developed Germany's first complete online platform for digital car purchases using ReactJS and related ecosystem. My role was developer/tech lead; duration: almost 2 years.
  Customer: hey.car
  Url: hey.car
  Date: 2018 - 2021.
• Developed (in team and independently) a ReactJS app using test driven development for an e-learning startup in Berlin.
  Customer: Wonderwerk.co
  Url: wonderwerk.co
  Date: 2018 - 2018.
• Embeddable webshop using ReactJS, Redux, Webpack, MySQL and Flask with an order/product management backend and advanced data export functionality.
  Customer: Danish Ministry of Higher Education and Science.
  Url: Not publicly available.
  Date: 2015 - 2018 (freelance work through Headnet).
• Custom integration between Cartodb and Podio management tool that displays geodata on different maps. Backend built using Laravel and MySQL.
  Customer: The Foundation for Environmental Education.
  Url: fee.global
  Date: 2015 - 2018 (freelance work through Headnet).
• Web app for finding and viewing verdicts built using BackboneJS, Grunt, MySQL, Flask, Elasticsearch and Docker.
  Customer: Danish Environmental Board of Appeal.
  Url: fredninger.dk
  Date: 2015 - 2018 (freelance work through Headnet).
• Co-developed a portal for exploring digitized images and artifacts from the museum's collection. Built using Express, ES6, Jade, SCSS, Angular and Elasticsearch.
  Customer: The National Museum of Denmark.
  Url: natmus.dk
  Date: 2015 - 2018 (freelance work through Headnet).
• Built various frontend functionality and UX combining Angular and geodata for a Danish housing startup.
  Customer: Bolighed
  Url: bolighed.dk
  Date: 2015 - 2018 (freelance work through Headnet).

Open source

I also developed and maintain various open source projets:

• Popular package for ES7, React, Redux and React​Native snippets for Sublime Editor (JS & TS).
• react-collapse-simple: Simple library for collapsing and expanding content with sliding animation (typescript)
• react-simple-social: Add all social share links through one simple and lightweight React component.
• npm-react-module: Boilerplate for developing ReactJS modules using Babel.
• react-pell2: ReactJS wrapper for Pell WYSIWYG text editor for web.
• flask-reactjs: Flask, ReactJS/Redux and webpack Boilerplate.
• flask-scaffolding: Flask Scaffolding featuring Python 3.4, SQLALCHEMY, BackboneJS, RequireJS & Sass (Bootstrap 3).
• deepl-extension: simple Deepl Chrome extension.

A few personal projects

These are products I started and built outside client work. They show the mix of product thinking, execution, and iteration I bring when moving from idea to something people actually use.

SQLAI.ai

AI-powered SQL workspace for analysts, engineers, and database teams. It helps users generate, explain, and refine SQL faster without sacrificing control.

Profitable product and one of the stronger AI-powered SQL tools in its category.

ViewDiff.ai

AI-assisted diff viewer built for professional writers and editorial workflows. It makes it easier to compare revisions, spot meaning changes, and review drafts with less friction.

Live product that is still being actively iterated on and refined.

Chartmaker.io

AI-powered chart maker focused on turning rough input and raw data into clean, presentation-ready visuals with minimal setup.

Built to shorten the path from idea or dataset to a usable chart.

WebsiteFeedback.ai

AI website feedback tool that reviews landing pages and marketing sites for clarity, positioning, UX, and first-impression issues.

Designed to give teams a fast outside perspective before deeper user testing.