Walter Barbagallo
Full Stack Engineer at Mollie
Vittorio Veneto, Veneto, Italy
Summary
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Rockstar🎓
Top SchoolWalter Barbagallo is a Full Stack Engineer with 11 years of experience building web applications and services, currently working at Mollie after nearly a decade at Satispay. He brings a practical full-stack skillset spanning front-end React typing and back-end integration, informed by real-world fintech product delivery. An active open-source contributor to high-profile typing projects like DefinitelyTyped and flow-typed, he has improved TypeScript and Flow definitions for widely used libraries including react-cropper, redux-form, react-apollo and antd—helping improve developer experience across the ecosystem. Based in Vittorio Veneto, Italy, he pairs formal multimedia and electronics training with hands-on embedded and web development experience from early roles. Known for meticulous type-safety work, he often focuses on subtle typing inconsistencies that prevent runtime surprises, making APIs safer for teams to adopt.
11 years of coding experience
11 years of employment as a software developer
Perito tecnico industriale Elettronica e telecomunicazioni, Perito tecnico industriale Elettronica e telecomunicazioni at I.T.I.S. Max PlanckScienze e Tecnologie Multimediali Scienze e tecnologie multimediali, Scienze e Tecnologie Multimediali Scienze e tecnologie multimediali at Università degli Studi di Udine
Italian, English, Spanish
Stackoverflow
251reputation
15kreached
3answers
1question
Github Skills (29)
libstdc10
libc10
typesc10
javascript10
lib10
flow-control10
libudev10
libdispatch10
work-flow10
flow-typed10
typescript10
typescript-definitions10
type-definition10
type-system10
dts10
Programming languages (8)
Github contributions (5)
flow-typed/flow-typed
May 2018 - Aug 2018
A central repository for Flow library definitions
Role in this project:
Front-end Developer
Front-end DeveloperContributions:1 review, 6 commits, 10 PRs in 3 months
Contributions summary:Walter primarily contributed to enhancing and refining the type definitions for React-related components and libraries within the repository. Their work involved defining and correcting type definitions for `react-apollo`, specifically addressing components like `ApolloConsumer` and the `Query` render props. Furthermore, the user added typing and tests for the `antd` library, improving the project's type safety and developer experience.
libdefsflowtypedefinitionscli
DefinitelyTyped/DefinitelyTyped
Feb 2019 - Mar 2022
The repository for high quality TypeScript type definitions.
Role in this project:Developer (Typescript Definition Contributor)
Developer (Typescript Definition Contributor)Contributions:3 reviews, 6 commits, 6 PRs in 3 years 1 month
Contributions summary:Walter primarily contributed to improving and maintaining TypeScript type definitions within the `definitelytyped/definitelytyped` repository. Their work involved fixing type errors and inconsistencies, specifically addressing issues related to `FormData` and `react-cropper`. They also made adjustments to the `redux-form` and `geoip-lite` type definitions, ensuring the accuracy and usability of the type definitions. The user's contributions included refining existing types and addressing typing-related issues.
typescript-definitionstype-definitionshigh-qualitydtsdefinitions
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