Alexander Gutheil

Alexander Gutheil

Senior Frontend Developer

Professional Summary

Senior Frontend Developer with 6+ years of focused experience building high-performance web and mobile applications, backed by a diverse technical background spanning system administration and 3D/VR development. Expert in Vue.js and Nuxt.js with extensive experience in React and modern JavaScript frameworks. Proven track record of leading frontend teams and delivering enterprise-level solutions. Specialized in CMS migrations, performance optimization, and modern meta-frameworks. Currently leading frontend teams at brandung GmbH, successfully delivering large-scale migrations and platform modernizations.

Professional Experience

Senior Frontend Developer

brandung GmbH

Cologne, Germany

January 2025 – Present

Leading multiple frontend teams, mentoring developers, and driving innovation through modern technology adoption, performance optimization, and AI-enhanced development practices

  • Continue leading the Deutsche Glasfaser frontend team, driving technical decisions and architecture evolution for the ongoing platform modernization
  • Lead an external agency team working on the relaunch of the Deutsche Glasfaser checkout system, conducting code reviews and ensuring code quality and architectural consistency
  • Mentor team members and establish development best practices
  • Successfully migrated the platform to Next.js 16 and React 19, ensuring seamless transition and improved performance
  • Implemented performance optimizations including Redis caching, image optimization, and bundle analysis
  • Set up CI/CD pipelines and automated deployment processes to streamline development workflows
  • Extensive work with AI tools and technologies, developing expertise in leveraging AI to enhance development workflows and productivity

Frontend Developer

brandung GmbH

Cologne, Germany

January 2021 – December 2024

Worked on various frontend projects including Flutter mobile development, Nuxt.js e-commerce relaunches, and Next.js CMS integrations. Progressed to Lead Frontend Developer role, leading the Deutsche Glasfaser platform modernization.

  • Built a Flutter mobile application for Tchibo's wlan to go service
  • Contributed to the About You Outlet relaunch as part of a team, working with Nuxt.js, Scayle, and Storybook
  • Participated in the 1. FC Köln website relaunch, a Next.js project integrated with Contentful CMS
  • Led the frontend team for the Deutsche Glasfaser GmbH relaunch, a major enterprise project migrating from TYPO3 to Next.js with Contentful CMS
  • Integrated Contentful CMS via GraphQL with automated type generation for type-safe content management
  • Implemented comprehensive testing strategy with Playwright for end-to-end tests, Vitest for unit tests, and Storybook for component testing
  • Managed the technical migration strategy and coordinated with cross-functional teams throughout the project lifecycle
  • Established component libraries and design systems to ensure consistency and reusability across projects
  • Collaborated closely with designers, backend developers, and product managers to deliver high-quality user experiences

Frontend Developer (Co-Founder)

Zazmo GmbH

Kassel, Germany

February 2019 – January 2021

Co-founded startup focused on innovative group payment solutions, securing EXIST founder scholarship for first-year funding

  • Designed and developed a web application for group payment processing from concept to production
  • Built the frontend architecture using Vue.js, ensuring scalability and maintainability
  • Integrated third-party services and APIs including Stripe and Usercentrics
  • Achieved 2nd place in Hessian Founder Prize and 3rd place in Nordhessen Promotion Competition
  • Delivered pilot project for Stadtwerke Kassel AG, which remains in active production use
  • Collaborated with stakeholders to conceptualize and implement digital business processes
  • Delivered a production-ready application meeting performance and security requirements

Software Developer

VirtuaTec

Kassel, Germany

September 2014 – February 2019

Specialized in creating cutting-edge 3D visualization and Virtual Reality solutions for the automotive industry, delivering immersive simulation environments and interactive experiences

  • Developed innovative 3D applications using Unity 3D for automotive simulation environments and HMIs
  • Created immersive Virtual Reality experiences for automotive applications
  • Designed and implemented 3D models using Maya
  • Programmed application logic in C# using Microsoft Visual Studio
  • Collaborated on storyboard development and virtual world creation
  • Optimized 3D rendering performance and VR application responsiveness for smooth user experiences
  • Worked closely with automotive clients to understand requirements and translate them into technical specifications
  • Delivered cutting-edge solutions for automotive industry clients

System Administrator

IT Service und Beratung

Kassel, Germany

June 2006 – September 2014

Provided comprehensive IT infrastructure management and technical support services, ensuring optimal system performance and reliability for business operations

  • Managed and maintained Windows and Linux server environments
  • Diagnosed and resolved complex IT issues in client and server environments
  • Created and maintained system documentation and project requirements
  • Ensured reliable IT infrastructure for business operations
  • Provided technical support and troubleshooting for clients

Web Designer (Freelance)

Self-Employed

Kassel, Germany

August 2003 – June 2006

Delivered end-to-end web design and development services as an independent contractor, creating tailored digital solutions that met client business objectives and technical requirements

  • Designed and developed custom websites for various clients
  • Worked with content management systems including WordPress
  • Implemented SEO best practices to improve client website visibility
  • Managed client relationships and project delivery
  • Created responsive designs ensuring cross-browser compatibility
  • Delivered projects on time and within budget constraints

Technical Skills

Frontend Frameworks & Libraries

Vue.jsNuxt.jsReactNext.jsTypeScriptJavaScript (ES6+)

Mobile Development

FlutterReact Native

Backend & Languages

GoC# (.NET)Node.js

Styling & Design

Tailwind CSSCSS3HTML5Responsive Design

CMS & Headless Platforms

ContentfulStoryblokScayle

Build Tools & Testing

WebpackVitePlaywrightVitestJestStorybookGitCI/CD

Tools & Platforms

DockerVercelRedisStripeUsercentricsNinetailed

Additional

Unity 3DMayaVirtual Reality Development

Projects

Deutsche Glasfaser Website

Deutsche Glasfaser

Deutsche Glasfaser is one of Germany's leading fiber optic internet providers, offering high-speed internet connections to homes and businesses across the country. The website provides information about fiber optic services, coverage areas, pricing plans, and allows customers to check availability and order connections. The platform delivers a modern, user-friendly experience to help customers find and subscribe to fiber optic internet services.

ReactNext.jsTypeScript
FC.de Website

FC.de

FC.de is the official website for 1. FC Köln, one of Germany's historic football clubs. The platform provides fans with the latest news, match reports, player information, ticket sales, and club updates. Built with React and Next.js, and powered by Contentful for content management, the website delivers a modern, responsive experience for fans to stay connected with their club.

ReactNext.jsTypeScriptContentful
About You Outlet Landing Page

About You Outlet

About You Outlet is the discount platform of ABOUT YOU, a German fashion online retailer. The outlet offers significant discounts on a wide range of fashion items, including clothing, shoes, and accessories from popular brands. Built with Nuxt for the frontend framework, integrated with Scayle for e-commerce functionality, and powered by Storyblok for content management, the platform provides a seamless shopping experience with dynamic content delivery and robust e-commerce capabilities.

NuxtScayleStoryblok
WLAN to go Mobile App

WLAN to go

Surf over WLAN – now also on the go: With the WLAN to go app and the Tchibo MOBIL router, you have internet access to take with you. Whether laptop or tablet, with WLAN to go you can now bring your devices and your friends' devices online while traveling, in the park or in the garden. And all without a fixed contract commitment! With the Tchibo MOBIL prepaid tariff, you only pay for WLAN to go when you need it.

FlutterDartMobile App
Zazmo Group Payment App

Zazmo

Zazmo is a German fintech solution from Kassel that offers an innovative app for real-time splitting of group costs and liability risks for shared purchases or services (e.g., shared apartment costs), by distributing risk among users and avoiding advance payments. Originally launched as Zazter, Zazmo enables the formation of payment groups through a web application and app to fairly share costs and liability, and has also established a partnership with Stadtwerke Kassel for electricity/gas.

Vue.jsJavaScriptStripeWeb App
Virtual Child Traffic Study VR App

Virtual Child Traffic Study

In cooperation with the University of Düsseldorf, this VR app for the Oculus Rift was created. The behavior of children, adolescents, and adults in traffic is to be investigated. As part of a study, test subjects are tested who cross a street in virtual space, with the goal of not being hit by cars.

UnityC#VROculus Rift
B3 Training VR Simulation

B3 Training VR Simulation

Within the framework of the B3 course held at the Hessian State Fire School, a VR simulation was developed in cooperation with the University of Kassel. Four different scenarios were focused on. These serve as training content for obtaining the group leader qualification in the professional fire department (full-time firefighters).

UnityC#VR
Fire Safety Simulation VR App

Fire Safety Simulation

The Fire Safety Simulation is a VR app for Android smartphones, which is used in hospitals for training fire safety measures. Through the method of procedural knowledge, hospital staff should learn the requirements of fire safety regulations. To this end, various scenarios are offered, which are intended to help the user make the right decision in every situation. A special guideline system playfully supports the learning process achieved.

UnityC#VRAndroid

Get In Touch

I'm always open to discussing new opportunities and interesting projects. Feel free to reach out!