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Jonas Mattes

Picture of Jonas glancing to the right.

Freelance Web Engineer

tl;dr;Angular LogoReact LogoHTML5 LogoCSS3 LogoTypeScript Logo

I'm a software engineer with five years of experience at companies like Google. I like building fast, reliable and accessible web experiences over the full stack. Also I love a good challenge. If you got one - hit me up!

About

My journey in computer science began somewhat by chance, but quickly let me to find my passion for user-centered web development. Over the past five years I specialized in crafting beautiful, functional, and accessible websites that prioritize user experience. I comfortably navigate the entire stack with Angular and React being my go-to technologies to create digital experiences that delight users.

Experience

Freelance

2024

Created pixel-perfect, responsive websites with the latest technology. Strong focus on usability and performance, as well as accessibility.
ReactAngularNextJSTailwind

Google

2022 - 2023

Optimized code review process for Google software engineers by analyzing utilization patterns and identifying opportunities to optimize usage, resulting in increased efficiency productivity and user satisfaction.
TypeScriptAngularVSCode API

Zühlke

2019 - 2022

Build, style, ship and maintain high-quality, customer-facing websites for various clients. Supported backend integration for improved system cohesion.
TypeScriptAngularStencilReact

MaibornWolff

2017 - 2018

Developed immersive VR and AR applications using Unity with the goal to explore benefits in various business sectors.
UnityVirtual RealityC#

BMW

2016 - 2017

Explored and implemented a custom interior control app for the users smartphone, focusing on improving user experience and comfort.
AndroidReverse Engineering

KundoXT

2016

Lead front end development in a small team developing a platform-agnostic smart home app.
JavaScriptAngularApache Cordova

Audi

2015

Implemented an in-car VR prototype and reasearched user acceptance and motion sickness.
UnityVirtual RealityC#
→   Download my resume

Projects

Freelance

2024

Food Board

Implemented pixel perfect components. Ensured compatibility with all screen sizes through responsive design.
ReactNextJSTypeScript
Freelance

2024

Daily Dashboard

Developing a dashboard which connects multiple APIs to provide a nice overview of the day. Utilized caching for faster response times esp. for expensive calls. Migrated to zoneless Angular 18 with signals to improve performance.
AngularNestJSTypeScriptMongooseRxJsZonelessSignals
Google

2022 - 2023

Streamlining Code Review

Worked on Googles internal code review platform, always trying to optimize for user satisfaction and efficiency. Planned and reviewed features based on usage statistics. Oversaw deployment and supported users.
AngularTypeScriptNgRxRxJs
Google

2022 - 2023

Code Review IDE Integration

Integrating code review artifacts into the VSCode based IDE to make it easier and faster to work on code feedback.
TypeScriptVSCode APIRxJs
Visana

2021 - 2022

Insurance Calculator

Developed an online insurance calculator where users can browse and select their individual health insurance.
AngularTypeScriptNgRxCypressKarmaJava
SBB

2020 - 2021

Modernize the Ticket Vending Machine

Technological redevelopment of the ticket vending machine to match the app UI, providing outstanding accessibility and uptime.
TypeScriptStencilJestCypressWebpackJava
SBB

2020 - 2021

Custom Tracking Library

Developed cross-browser compatible library to track user behavour and displayed contents.
JavaScriptKarmaBabelWebpackBrowserStack
Zühlke

2019 - 2020

Mobile Security Training Quiz

Mobile-first, card-based quiz which let's users playfully learn about security topics.
ReactJavaScriptReduxJest
MaibornWolff

2017 - 2018

Technological Research in AR & VR

AR prototype to overlook and maintain conveyor belts in a factory. Analyzing its performance with a user-study.
UnityC#HoloLens
BMW

2016 - 2017

Car Interior Control System Prototype

Exploratory development of an Android app to control interior functionality to simplify usage and improve user satisfaction.
AndroidJavaReverse Engineering
KundoXT

2016

Smart Home Control

Web-based app to interact with a smart home system.
AngularJavaScriptApache Cordova
Audi

2015

In-Car VR Experience Prototype

Researched and implemented an in-car VR experience using live vehicle data. Tested user acceptance of the concept.
UnityC#ADTFC++
This website is 100% self built in React with NextJS and Tailwind CSS. Check it out on my GitHub if you're interested.
The website design and functionality is heavily inspired by Brittany Chiang.