Matthias Bayer, Developer in Munich, Bavaria, Germany
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Matthias Bayer

Verified Expert  in Engineering

Full-stack Developer

Munich, Bavaria, Germany

Toptal member since January 24, 2017

Expertise
Full-stackFront-endCSSHTML5SQLJavaScriptPHPNode.jsGitHubReact.jsWebRTCTypeScriptNext.jsVercelGraphQL
Bio

Matthias is a software engineer living in Munich, Germany. He has over a decade of experience designing and developing apps using the best web technologies. Matthias has a soft spot for the open-web platform and open-source software. He primarily works with JavaScript or TypeScript to develop modern software for the browser or the Node.js platform.

Portfolio

Stealth
TypeScript, Next.js, Artificial Intelligence (AI), Machine Learning, JavaScript...
M21 Technologies
JavaScript, TypeScript, React, Next.js, React Native, HTML5, CSS, MongoDB...
Peppy
JavaScript, TypeScript, React, React Native, Google Cloud Platform (GCP)...

Experience

  • Full-stack - 15 years
  • JavaScript - 15 years
  • Node.js - 10 years
  • React - 7 years
  • TypeScript - 6 years
  • Next.js - 5 years
  • Artificial Intelligence (AI) - 5 years
  • Machine Learning - 2 years

Availability

Part-time

Preferred Environment

MacOS

The most amazing...

...project I've worked on was writing software for autonomous self-driving cars.

Work Experience

Senior Software Engineer

2024 - PRESENT
Stealth
  • Built AI chat platforms integrating LLMs with external data sources to enable real-time, context-aware responses.
  • Developed RAG pipelines for real-time data retrieval and enhanced conversational accuracy.
  • Scaled AI chat systems for high performance, low latency, and seamless integrations.
  • Led back-end architecture improvements to support large-scale AI chat applications.
Technologies: TypeScript, Next.js, Artificial Intelligence (AI), Machine Learning, JavaScript, Vercel, Front-end, Shadcn, Recharts, Tailwind CSS, GitHub, Clerk, tRPC

Software Engineer

2019 - PRESENT
M21 Technologies
  • Provided software engineering and consulting services for tech startups. Collaborated with Cruise LLC, Labelbox, Inc., Owner.com, Inc., and more.
  • Specialized in working with small to medium startups in Silicon Valley.
  • Performed 100% remote work through my own company in Germany.
Technologies: JavaScript, TypeScript, React, Next.js, React Native, HTML5, CSS, MongoDB, MongoDB Atlas, HTML, APIs, REST, GraphQL, PostgreSQL, Redis, Tailwind CSS, Vercel, AWS IoT, Expo, Firebase, Node.js, Redux, SQL, Express.js, Webhooks, Automation, REST APIs, MySQL, NestJS, Full-stack, Docker Compose, Front-end, Shadcn, Recharts, GitHub, Clerk, Planet Scale, Axiom, Cloudflare, tRPC

Senior Software Engineer

2023 - 2024
Peppy
  • Architected the foundation for a next-gen personal health app offering easy access to healthcare.
  • Advised on tech stack choices and product strategies.
  • Developed scalable consumer platform and application solutions for seamless access to healthcare services.
Technologies: JavaScript, TypeScript, React, React Native, Google Cloud Platform (GCP), Node.js, Docker Compose, Front-end, Recharts, Tailwind CSS, GitHub, Prisma, Cloudflare

Senior Software Engineer

2022 - 2023
Owner
  • Built the most advanced all-in-one food online ordering platform for individual restaurant owners on the web and mobile.
  • Helped scale the application and infrastructure to handle 10x more customers.
  • Planned and executed cross-platform, cross-team features and oversaw their launch.
  • Researched and introduced several features and optimizations to boost performance, order volume, and conversion rates.
Technologies: JavaScript, TypeScript, React, Next.js, Node.js, CSS, HTML, MongoDB, MongoDB Atlas, APIs, REST, REST APIs, SQL, Tailwind CSS, Vercel, Amazon Web Services (AWS), React Native, Expo, Firebase, Webhooks, Automation, Full-stack, Artificial Intelligence (AI), Docker Compose, Front-end, Recharts, GitHub, Clerk, Prisma, Cloudflare, tRPC

Senior Software Engineer

2021 - 2022
Labelbox
  • Worked for Labelbox, a leading training data platform for managing machine learning data.
  • Developed scalable back-end APIs that allow managing datasets with millions of data points in a performant way.
  • Contributed front-end components that improve the UI/UX of the application and enable new efficient workflows for users.
Technologies: JavaScript, TypeScript, React, Node.js, GraphQL, CSS, HTML, PostgreSQL, Redis, APIs, NestJS, Redux, SQL, Express.js, Webhooks, Automation, Next.js, Machine Learning, Python, Java, Artificial Intelligence (AI), Full-stack, Docker Compose, Amazon Web Services (AWS), Front-end, GitHub, Prisma

Senior Software Engineer

2019 - 2021
Cruise
  • Developed a web application to manage mapping data for autonomous vehicle navigation.
  • Optimized the runtime performance of front-end applications.
  • Wrote scalable back-end APIs to manage significant amounts of data.
Technologies: JavaScript, TypeScript, React, Mapbox, Node.js, REST, CSS, HTML, MySQL, Redis, Mapbox GL, APIs, NestJS, REST APIs, Redux, SQL, Express.js, Full-stack, Artificial Intelligence (AI), Docker Compose, Amazon Web Services (AWS), Front-end, GitHub

Software Engineer

2016 - 2019
Personal Project | PeerIt Video Delivery Network
  • Built a peer-to-peer content delivery network based on WebRTC.
  • Constructed a real-time tracker using WebSockets and Node.js.
  • Developed isomorphic packages for native cryptographic operations in node and the browser.
  • Performed content integrity and authenticity checks using PKI and merkle trees.
  • Created JavaScript plugins for several video players.
  • Developed a debug interface using Vue.js.
  • Wrote a scientific paper about media delivery using peer-to-peer networks in the browser.
Technologies: Docker, WebRTC, Node.js, TypeScript, CSS, HTML5, JavaScript, PostgreSQL, HTML, APIs, NestJS, SQL, Express.js, Full-stack, Docker Compose, Front-end, GitHub

Software Engineer

2017 - 2017
Personal Project | Reflect OS
  • Developed a modular smart mirror operating system using Electron, Node.js, and Vue.
  • Implemented voice command recognition with Node.js and Google Speech-to-Text API.
  • Developed the interactive front end with Electron and Vue.
  • Implemented real-time weather and traffic updates using Node.js.
Technologies: Vue, Node.js, Electron, CSS, HTML5, JavaScript, PostgreSQL, HTML, APIs, SQL, Express.js, Full-stack, Docker Compose, Front-end, GitHub

Senior Software Engineer

2014 - 2017
Soprado GmbH
  • Developed and maintained a web application using AngularJS.
  • Built a REST API with Symfony and AngularJS frameworks.
  • Created an Elasticsearch logfile visualization using AngularJS and D3.js.
  • Wrote software to manage a 100+ server infrastructure using Ansible and Kubernetes.
  • Worked as part of the DevOps team to maintain server and network infrastructure.
  • Built a real-time statistics API using WebSockets and Node.js.
  • Ported a legacy AngularJS web application to React.
Technologies: React, Kubernetes, Ansible, Docker, Elasticsearch, MongoDB, PHP, Symfony, Node.js, AngularJS, JavaScript, CSS, HTML5, HTML, Angular, APIs, REST APIs, SQL, Full-stack, Docker Compose, Front-end, GitHub

Lead Software Engineer/DevOps

2012 - 2014
Soprado GmbH
  • Built a fully automated ordering module using REST APIs and Selenium for web browser automation.
  • Led the development team (approximately ten people).
  • Managed the server and network.
  • Refactored and maintained existing PHP projects.
  • Developed the front end with JavaScript and jQuery.
Technologies: Zend Framework, Selenium, Vagrant, MySQL, PHP, JavaScript, CSS, HTML5, HTML, Angular, APIs, REST APIs, SQL, Webhooks, Full-stack, Docker Compose, Front-end, GitHub

Web Developer (Freelance)

2011 - 2012
RAYSTORM Digital Studio
  • Managed the project and provided customer service.
  • Enhanced an existing custom PHP CMS.
  • Maintained and improved existing projects.
Technologies: Linux, MySQL, PHP, CSS, HTML5, JavaScript, HTML, REST APIs, SQL, Full-stack, Front-end

Web Developer

2010 - 2011
RAYSTORM Digial Studio
  • Built an online food ordering system from scratch.
  • Created multiple websites using TYPO3 or Zend Framework.
  • Developed an automated web hosting and billing system.
  • Enhanced an existing custom PHP CMS.
  • Performed server and network administration.
Technologies: jQuery, Zend Framework, JavaScript, MySQL, PHP, CSS, HTML5, HTML, SQL, Full-stack, Front-end

Freelance Developer

2008 - 2010
Freelance Work
  • Built small websites using WordPress and Joomla.
  • Developed custom WordPress plugins.
  • Created a custom PHP MVC-Framework.
  • Used jQuery for animations.
  • Built rich user interfaces with Ajax.
Technologies: jQuery, JavaScript, PHP, CSS, HTML5, HTML, APIs, SQL, Full-stack, Front-end

Experience

Profile

http://bayer.dev
Please visit my personal profile page to see possible ways to contact me and learn more about my experience.

The page was built with Next.js and is hosted on Vercel.

Reflect OS

Created a modular smart mirror OS using Electron, Node.js, and Vue, with voice command recognition via Google Speech-to-Text. Integrated real-time weather and traffic updates and developed the software to run on the mirror.

PeerIt

I developed a peer-to-peer network in the browser using WebRTC. This network created a secure, distributed real-time file system that can be used to distribute arbitrary files between peers. Together with HTTP streaming and the Media Source Extensions API, this can be used to distribute video fragments between viewers to reduce the load on the servers of the content provider. I also wrote a scientific paper about this technology at my university.

Sheetlify

I'm currently working on a service that turns spreadsheets saved in the cloud (Google Drive, Office 365) into a GraphQL or REST API. Technologies involved are TypeScript, GraphQL, MongoDB, React, Redux, and Node.js.

Self Improvement

In my free time, I develop web applications and small services to try out new tech, languages, or frameworks. The technologies I use a lot include React Native, Go, and exciting browser APIs like WebRTC, Streams API, or the Serial API.

Education

2015 - 2019

Master of Science Degree in Media Computer Science (Web and App Development, Usability Engineering)

Wilhelm Büchner University of Applied Sciences - Pfungstadt, Germany

2011 - 2013

Bachelor of Science Degree with Honors in Web Development and Design

SAE Institute Munich | Middlesex University London - Munich, Germany and London, UK

Skills

Libraries/APIs

Node.js, WebRTC, React, Mapbox GL, Recharts, Stripe, Stripe API, OpenAI API, jQuery, Vue, REST APIs, Vue 2, Vuex

Tools

Docker Compose, Shadcn, GitHub, Webpack, NPM, NGINX, Expo, Prisma, Vagrant, Ansible, Git, MongoDB Atlas

Languages

HTML, CSS, HTML5, SQL, JavaScript, PHP, TypeScript, GraphQL, Python, Java

Frameworks

PHP MVC, Redux, Next.js, tRPC, Symfony 3, Express.js, React Native, NestJS, Tailwind CSS, Selenium, AngularJS, Electron, Zend Framework, Symfony, Nuxt.js, Jest, Angular

Platforms

Vercel, Clerk, Linux, Docker, Kubernetes, Mapbox, Amazon Web Services (AWS), Firebase, AWS IoT, MacOS, Google Cloud Platform (GCP)

Storage

PostgreSQL, Databases, Elasticsearch, MySQL, NoSQL, MongoDB, Redis

Paradigms

Test-driven Development (TDD), Agile Software Development, Responsive Web Design (RWD), Class-based OOP, Prototype-based OOP, Functional Programming, DevOps, Asynchronous Programming, REST, Automation

Other

Full-stack, APIs, Front-end, Webhooks, Apollo, Artificial Intelligence (AI), Large Language Models (LLMs), OpenAI, Planet Scale, Styled-components, Computer Science, Web Development, Machine Learning, Axiom, Cloudflare

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