Stephan Ellenberger

Hi, I'm Stephan.

A classically trained pianist turned Software Developer.

I've a passion for all things tech, music, food, travel and teaching.

I architect and develop scalable microservice systems to automate all things possible within the Performance Marketing team at Just Eat Takeaway.com.

I'm the owner of Flight Weasel, a cheap flights newsletter + alert tool with 200+ subscribers receiving ultra cheap flights.

When I am away from the screen, find me exploring the world, reading or cooking (if AI leaves me jobless, I'll open a pizzeria!).

I currently based out Amsterdam. Worked/lived in UK and Australia.

Click me to get in touch

• 2022 — Present

  Senior Full Stack Developer · Marketing · Just Eat Takeaway.com

  professional

  Amsterdam, Netherlands

  Architect and develop scalable microservice systems to automate tedios marketing tasks at scale, such as campaign creation, location targeting, offline conversions and landing page creators. Involved in the entire software development lifecycle from ideation to implementation.

  JavaSpringbootPostgreSQLJavaScriptNextJS
• 2021 — 2022

  Software Developer · Department for Education · Home Office · Civil Service

  professional

  London, United Kingdom

  Contributed open source code to the Get Into Teaching journey at Department for Education Digital in Ruby + Ruby on Rails (TDD, BDD, multi-disciplinary teams).

  Open SourceRuby on RailsJavaScriptGitHub ActionsTDDHTML/CSS
• 2020 — 2023

  API Developer · now-u

  volunteering

  Remote - United Kingdom

  Implemented tested API endpoints for the now-u app api in Ruby on Rails. Developed custom CMS/admin dashboard for volunteers to manage their campaigns and newsletters

  RubyRuby on RailsActive Record
• 2020 — 2022

  Frontend Developer · Code Roots

  volunteering

  London, United Kingdom

  Implemented professional Figma Designs into pixel-perfect ReactJS Code. Made the codebase mobile friendly.

  ReactJSMobile OptimizationFigmaJavaScriptAccessibility
• 2022 — 2024

  Course Instructor & Mentor · Code First Girls

  volunteering

  London, United Kingdom

  Volunteered as an Instructor and Mentor in a free 8 week course to teach girls how to code remotely. The course involved a 2 hour class every week with 3 other instructors teaching the course materials.

  JavaScriptPythonWeb DesignHTMLCSSSPA

Portfolio

• 

  Flight Weasel

  2024

  Cheap flights newsletter + alert tool with 200+ subscribers.

  Next.jsTypeScriptTailwindVercelStripe

• Campaign Builder

  2024

  Engine that populates custom templates to generate campaigns at scale.

  JavaSpringbootGCP Cloud RunBig QueryGitHub Actions

• Geo Sync

  2024

  Tool to sync 300,000+ locations to their respective Google Ads campaigns.

  JavaSpringbootCloud RunChannableGoogle Ads APIData Structures

• Personal Website

  2025

  This portfolio, built with a minimal design system.

  Next.jsTypeScriptTailwind