Andreas Geffen Lundahl, Software Developer in Växjö, Sweden
Andreas Geffen Lundahl

Software Developer in Växjö, Sweden

Member since July 10, 2015
Andreas is a software architect and developer with a passion for startups and entrepreneurship. He has traditionally worked a lot in eCommerce and finance, but he's always eager to enter new domains. In his consulting and contracting engagements, he strives for maintainable code that doesn't compromise on quality.
Andreas is now available for hire


  • Touchtech
    Electron, Redux, React
  • Outnorth
    AWS, PostgreSQL, Ruby on Rails (RoR), Ruby
  • WM3
    AWS, JavaScript, Ruby on Rails (RoR), Ruby



Växjö, Sweden



Preferred Environment

Git, Emacs, Linux, OS X

The most amazing...

...thing I've built is a trading application for executing predefined strategies on the Swedish stock market.


  • Architect

    2019 - PRESENT
    • Architected and implemented an MVP for a specific touchscreen use case.
    Technologies: Electron, Redux, React
  • Architect

    2019 - 2019
    • Helped modernize the eCommerce platform for Outnorth, one of Northern Europe's leading sites for outdoor equipment. Besides working on the architecture and implementation of the new platform, Andreas also worked with the in-house development team to improve internal processes.
    Technologies: AWS, PostgreSQL, Ruby on Rails (RoR), Ruby
  • Acting CTO

    2017 - 2018
    • Led the development and improved the long-term vision for the product.
    Technologies: AWS, JavaScript, Ruby on Rails (RoR), Ruby
  • Architect

    2017 - 2017
    Undisclosed Trading Application
    • Architected and led the implementation of an application for stock traders. The application was built to facilitate the execution of certain strategies on stock markets.
    Technologies: Electron, Clojure
  • Developer

    2016 - 2017
    • Led the implementation of checkout flows, from Articulate's website to integrations with Stripe and Salesforce, and everything in between.
    Technologies: Redux, React, JavaScript, Ruby on Rails (RoR), Ruby
  • Developer

    2015 - 2016
    • Designed, architected, and implemented a completely new product.
    Technologies: React, JavaScript, Java
  • Developer

    2013 - 2014
    • Played a key role in modernizing the front-end architecture and implementing React for Fortnox, one of the leading business software providers in Sweden.
    Technologies: React, JavaScript
  • Team Lead

    2013 - 2013
    • Led a team for healthtech startup Kryapp. The work mostly consisted of building more features, such as a medical record system which passed a rigorous certification process.
    Technologies: MongoDB, JavaScript, Ruby on Rails (RoR), Ruby
  • Developer

    2013 - 2013
    Multiple Swedish Public Transport Companies
    • Helped architect and implement a combined CMS and CRM for Swedish public transport companies. The systems developed are still daily used by hundreds of thousands of people.
    Technologies: PostgreSQL, JavaScript, Ruby on Rails (RoR), Ruby
  • Architect

    2012 - 2013
    • Helped architect the initial MVP.
    Technologies: PostgreSQL, JavaScript, Ruby on Rails (RoR), Ruby
  • Team Lead

    2012 - 2012
    • Led a team to build an MVP for a startup in healthtech. Besides leading a team of developers and designers, I was also responsible for initial architecture.
    Technologies: MongoDB, JavaScript, Ruby on Rails (RoR), Ruby
  • Developer

    2011 - 2012
    Boss Media
    • Contributed to the development of customizable administrative panels for players.
    Technologies: JavaScript, Ruby on Rails (RoR), Ruby
  • Developer

    2011 - 2011
    • Contributed to the development of geographical tracking and visualization of trucks, time management for drivers, and more.
    Technologies: Java, JavaScript, Ruby on Rails (RoR), Ruby
  • Developer

    2009 - 2010
    • Helped one of Europe's leading name tag manufacturers to digitalize and improve their workflows by building internal tools and systems.
    Technologies: Backbone.js, JavaScript, Java


  • Mapery (Development)

    Mapery is a collection of luxury map prints. Using a unique design method, we offer the most elegant and timeless map prints.

    Mapery has received over 140 five star reviews.


  • Languages

    ECMAScript (ES6), Less, CSS3, ES7, Sass, CoffeeScript, HTML, CSS, Clojure, JavaScript, Ruby, SQL, Elixir, PHP, GraphQL, Python, Java, Go
  • Frameworks

    Electron.js, Redux, Selenium, ClojureScript, Ruby on Rails (RoR), Electron, Relay
  • Libraries/APIs

    Shopify API, Node.js, Stripe, Underscore.js, Backbone.js, React, Sidekiq, Etsy API, Normalizr, GitHub API, Auth0 API
  • Tools

    Git, RSpec, GitHub, AWS ECR, AWS ECS, AWS Fargate, Redux Thunk, Gulp.js, Subversion (SVN), Adobe Photoshop, Adobe Illustrator, Apache ZooKeeper, AWS ELB, AWS CLI, Amazon Virtual Private Cloud (VPC), Emacs, Etcd, GIS, AWS ElastiCache
  • Paradigms

    Agile, Test-driven Development (TDD), Functional Programming, Distributed Programming, Scrum, Data Science
  • Platforms

    Shopify, Amazon Web Services (AWS), Docker, AWS EC2, AWS Lambda, Linux, OS X, Salesforce
  • Storage

    PostgreSQL, AWS S3, AWS RDS, RethinkDB, MongoDB, Redis, Elasticsearch, PostGIS
  • Other

    Shopify Customizations, Datomic, Web App Development, Etsy, Consul, User Experience (UX), Customer Development, Business Development, AWS

To view more profiles

Join Toptal
Share it with others