Christian Rackerseder
IT-Fachmann at Freiberufler
Munich, Bavaria, Germany
Summary
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RockstarChristian Rackerseder is an experienced IT professional and freelance full-stack developer based in Munich with 12 years in software engineering, specializing in TypeScript, Jamstack, and serverless architectures. He contributes to high-profile open-source projects like DefinitelyTyped, improving TypeScript type safety for popular JavaScript libraries and React hooks to enhance developer experience. Comfortable across front-end and backend concerns, he focuses on pragmatic, maintainable solutions that bridge developer ergonomics and production reliability. As a freelancer, he combines hands-on coding with consulting, often translating ambiguous requirements into well-typed, testable implementations. An attentive contributor, he has not only added types but introduced namespaces and refined response typings—small details that prevent subtle runtime issues.
12 years of coding experience
Github Skills (9)
type-system10
typescript10
typesc10
javascript10
typescripts10
type-definition10
typescript-types10
enzyme9
react9
Programming languages (27)
Github contributions (5)
DefinitelyTyped/DefinitelyTyped
Oct 2016 - Jan 2021
The repository for high quality TypeScript type definitions.
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:22 reviews, 72 commits, 38 PRs in 4 years 4 months
Contributions summary:Christian primarily contributed to the creation of TypeScript type definitions for various JavaScript libraries and React hooks, which involved defining interfaces, types, and testing implementations. They added type definitions for projects like `pino-http`, `@commercetools/enzyme-extensions`, `giphy-api`, `use-set-interval`, and `use-set-timeout`, improving the type safety and developer experience for these libraries. Furthermore, the user updated the `giphy-api` response type and introduced a namespace for better type visibility.
typescriptdefinitiondtstypingstypescript-definitions
enormora/eslint-config
Feb 2024 - Jul 2026
Contributions:34 reviews, 40 PRs, 87 pushes in 2 years 5 months
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