Fullstack Software Engineer

12/2019 – 3/2020

PROJECT
React component library

CLIENT
Germany's leading online marketplace for real estate

SKILLS
React, Preact, Redux, Router, JavaScript, TypeScript, i18n, a11y, REST, Node, Serverless, Express, Swagger, RDS, MySQL, DynamoDB, TDD, Jest, Cypress, Codecept, Playwright, Enzyme, Testing Library, Storybook, CI/CD, AWS, CloudFormation, Jenkins, Recharts, Less, Google Maps, Kanban

ACHIEVEMENTS & RESPONSIBILITIES
• Developed and supported the rollout of a component library that built the foundation for the most comprehensive rebranding and redesigns in the client’s 20-year history – a multi-million EUR initiative affecting 1,500 employees and hundreds of thousands of daily visitors

React (JavaScript library)

7/2019 – 12/2021

PROJECT
Subscription-based online service to streamline the process of buying a house

CLIENT
Germany's leading online marketplace for real estate

SKILLS
React, Preact, Redux, Router, JavaScript, TypeScript, i18n, a11y, REST, Node, Serverless, Express, Swagger, RDS, MySQL, DynamoDB, TDD, Jest, Cypress, Codecept, Playwright, Enzyme, Testing Library, Storybook, CI/CD, AWS, CloudFormation, Jenkins, Recharts, Less, Google Maps, Kanban

ACHIEVEMENTS & RESPONSILITIES
• Developed a suite of premium web application products and helped grow the revenue from 1.3M EUR in the
first year to 6.7M EUR in the second year (based on 20,000 paying subscribers)
• Onboarded and mentored 3 Junior Developers and led a team of 5 frontend engineers to become the „best- organized team,“ according to the Head of Technology
• Coordinated other team’s contributions and coached their team members on how to write clean code and good tests and how to develop components in isolation with a Storybook
• Reduced the runtime of the test suite from 25 minutes to under 10 minutes by identifying and working around performance bottlenecks in the React Testing Library and by refactoring bad code into clean code
• Inherited a legacy project with outdated code that needed urgent adjustments and improved the code quality and coverage from 50% to 90% over the course of 3 months
• Took over Product Ownership during the Product Owner’s scheduled absence

React (JavaScript library)

10/2018 – 3/2019

PROJECT
Dashboard to manage mortgages

CLIENT
Germany's leading online marketplace for real estate

SKILLS
React, Preact, Redux, Router, JavaScript, TypeScript, i18n, a11y, REST, Node, Serverless, Express, Swagger, RDS, MySQL, DynamoDB, TDD, Jest, Cypress, Codecept, Playwright, Enzyme, Testing Library, Storybook, CI/CD, AWS, CloudFormation, Jenkins, Recharts, Less, Google Maps, Kanban

ACHIEVEMENTS & RESPONSIBILITIES
• Helped the client to get back in touch with their „lost“ leads (previously sold to partners) and thus significantly increased the customer lifetime value for the client
• Developed a responsive dashboard with interactive custom pie, bar, and line charts using Recharts
• Implemented React components with a clean interface and local state, which are easily integrated into the dashboard and positioned with a Bootstrap-like library
• Maintained an Express-based mock API to allow local development of the React application

React (JavaScript library)

10/2018 – 2/2019

PROJECT
Real estate search engine for private investment opportunities

CLIENT
Germany's leading online marketplace for real estate

SKILLS
React, Preact, Redux, Router, JavaScript, TypeScript, i18n, a11y, REST, Node, Serverless, Express, Swagger, RDS, MySQL, DynamoDB, TDD, Jest, Cypress, Codecept, Playwright, Enzyme, Testing Library, Storybook, CI/CD, AWS, CloudFormation, Jenkins, Recharts, Less, Google Maps, Kanban

ACHIEVEMENTS&RESPONSIBILITIES
• Developed an accessible React web application to find apartments or houses as private investment

React (JavaScript library)

4/2018 – 9/2018

PROJECT
White-label travel search engine

CLIENT
Booking system provider driving 1.3 BN Euros in annual revenue

SKILLS
Vue, JavaScript, HTML, CSS, Jenkins, Node, Swagger, Express, TDD, Scrum

ACHIEVEMENTS & RESPONSIBILITIES
• Developed the next version of a white-label travel search engine, including versatile filtering options

JavaScript, Vue.js

2/2018 – 4/2018

PROJECT
Smart home solution for people with special needs

CLIENT
Provider of IoT home solutions

SKILLS
React, Redux, Bootstrap, JavaScript, SCSS, TDD, Enzyme, Protractor, Express, Mongoose, MongoDB, XP

ACHIEVEMENTS & RESPONSIBITIES
• Developed a MERRRN application to detect and report dangerous situations in retirement homes

React (JavaScript library)

5/2017 – 7/2017

PROJECT
Video post-processing tool

CLIENT
Leader in satellite-based wildlife monitoring

SKILLS
Java, JavaFX, Swing, Spring, REST, PostgreSQL, JavaScript, jQuery, AJAX, KML, HTML, CSS, Maven, Tomcat, SVN, Google Maps API, Acceptance Testing, Squarespace, WordPress, Git

ACHIEVEMENTS & RESPONSIBITIES
• Developed a Java application for post-processing JPG and MP4-based data of wildlife monitoring collars
• Optimized the battery lifetime of tracking collars from weeks to months by turning specific hardware on only when needed and compensating for a resulting lack of metadata with post-production software

Java (allg.), Swing (Java)

12/2016 – 8/2017

PROJECT
Web application for live observation of animal behavior

CLIENT
Leader in satellite-based wildlife monitoring

SKILLS
Java, JavaFX, Swing, Spring, REST, PostgreSQL, JavaScript, jQuery, AJAX, KML, HTML, CSS, Maven, Tomcat, SVN, Google Maps API, Acceptance Testing, Squarespace, WordPress, Git

ACHIEVEMENTS & RESPONSIBILITIES
• Developed a web application to allow biologists to conduct complex studies of sleep and hibernation patterns based on monitoring data such as body temperature, collar orientation, or activity
• Allowed researchers to better understand the migration of herds and packs by retrieving GPS data from SQL database and visualizing animal positions and virtual fences on Google maps

Java (allg.), Spring

6/2014 – 3/2017

PROJECT
Satellite-based wildlife tracking

CLIENT
Leader in satellite-based wildlife monitoring

SKILLS
Java, JavaFX, Swing, Spring, REST, PostgreSQL, JavaScript, jQuery, AJAX, KML, HTML, CSS, Maven, Tomcat, SVN, Google Maps API, Acceptance Testing, Squarespace, WordPress, Git

ACHIEVEMENTS & RESPONSIBILITIES
• Simplified the user experience of a collar configuration software by eliminating unnecessary steps
• Decreased collar configuration time by 80% with a new system to test multiple collars simultaneously

Java (allg.)