David Christoph Birkhölzer

• Worked on a range of web projects over the last two years, including a multi-tenant online booking platform for yoga studios, business websites and booking tools for small clients such as a yoga studio, event rental service and dental practice.
• Technologies included Next.js, tRPC, Prisma, and Stripe Connect for features like class scheduling, online classes, real-time revenue dashboards and secure payments.
• Responsible for architecture, frontend and backend development, API integrations, and UI design, delivering performant, maintainable and user-friendly solutions.

Pink.gg Solutions GmbH was a German blockchain gaming startup known for developing AtomicHub, a popular NFT marketplace supporting multiple blockchains. The company gained traction in the NFT space but filed for insolvency in 2023 and was subsequently acquired by Spielworks, which continues to operate and develop the AtomicHub platform within the Web3 gaming ecosystem.

My Impact

• Spearheaded the complete redesign of the core AtomicHub NFT marketplace, engineering a more intuitive and performant user experience with React and TypeScript.
• Architected and implemented a new, fully responsive header and mobile navigation system, significantly improving usability and accessibility across all devices.
• Championed the team’s TypeScript strategy, establishing strict typing standards, reusable patterns, and mentoring other engineers to elevate code quality and reduce runtime errors.

2xideas AG is an innovative technology company specializing in developing cutting-edge digital solutions and software products. With a focus on creativity and user-centric design, 2xideas AG delivers customized IT services that help businesses optimize processes, enhance customer experiences, and drive digital transformation across various industries.

My impact

• As the sole Frontend Engineer, led the complete migration of the platform from vanilla JavaScript to a modern, type-safe TypeScript and React stack.
• Collaborated directly with the CEO to rapidly design, prototype, and launch new admin dashboard interfaces, accelerating the product development lifecycle.
• Engineered a complex client-facing analytics area featuring numerous data visualizations and interactive graphs to deliver actionable insights.

CHECK24 Vergleichsportal GmbH is Germany’s leading online comparison platform, founded in 1999 and based in Munich. It offers free price comparisons across over 50 categories, including insurance, finance, energy, and travel. Known for transparency and customer focus, CHECK24 uses advanced technology to deliver personalized, data-driven offers. The company has received numerous awards and also operates the online C24 Bank.

My impact

• As a founding member of the critical 'Post Booking Engine' team, developed essential infrastructure to manage post-booking services during the peak of the COVID-19 crisis.
• Rapidly built and deployed over 40 distinct, fully-functional landing pages for travel providers in a matter of days, enabling efficient communication for rebookings and refunds.
• Collaborated closely with backend engineers to define and agree upon API contracts using OpenAPI (Swagger), ensuring seamless data flow in a new and evolving TypeScript codebase.

Company Overview: David Kelly Design Office (DKDO) is a Glasgow-based digital design studio founded in 2005. They specialize in creating user-focused websites, CMS solutions, and e-commerce platforms, serving clients with tailored digital products and IT consultancy.

My impact

• Developed bespoke, pixel-perfect websites for a diverse range of clients, ensuring faithful execution of design specifications and a keen eye for detail.
• Specialized in building and maintaining sites using various platforms, including WordPress, CraftCMS, and a proprietary PHP-based Content Management System.

Hope Studio Glasgow is a wellness studio offering yoga classes, massage therapies, and community events in a tranquil setting. Founded by David Birkhölzer, a former yoga teacher and web developer, the studio emphasizes holistic well-being and community engagement.