Simon聽Gellis
Senior Software Engineer at Sundae Labs, Inc.
New York City Metropolitan Area United States
Summary
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Rockstar馃帗
Top SchoolSimon Gellis is a Senior Software Engineer with 11 years building full-stack systems and platform tooling, currently shaping human capital management software at Sundae Labs after leading platform work at Lifion by ADP. He specializes in server-side and database development and is fluent in JavaScript/TypeScript, Rust, and C#/ASP.NET, frequently converting product requirements into robust microservices and low-code features across 100+ service ecosystems. He has driven data migrations with minimal downtime, architected low-code UI testing and coverage tools, and built a React browser extension to boost developer productivity. An early programmer who completed both BS and MS in Computer Science from NYU in an accelerated four-year track, he also contributes to DefinitelyTyped, improving TypeScript definitions to tighten developer DX and type safety.
11 years of coding experience
11 years of employment as a software developer
Masters of Science (MS) Computer Science, Masters of Science (MS) Computer Science at New York University - Polytechnic School of Engineering
Stackoverflow
143reputation
7kreached
2answers
1question
Github Skills (12)
type-system10
typescript10
typesc10
typescript-definitions10
typescripts10
type-definition10
typescript-types10
javascript9
parameterized6
oracle6
dapper6
typescript-compiler-api6
Programming languages (15)
Github contributions (5)
DefinitelyTyped/DefinitelyTyped
Jul 2016 - Jan 2020
The repository for high quality TypeScript type definitions.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:54 reviews, 25 commits, 7 PRs in 3 years 7 months
Contributions summary:Simon primarily contributed to improving the type definitions within the `definitelytyped/definitelytyped` repository, a project focused on high-quality TypeScript type definitions. Their work included fixing return types, improving existing type definitions for various libraries, and adding new type definitions. The user鈥檚 contributions focused on enhancing the accuracy and completeness of TypeScript type definitions, ensuring better developer experience and code safety. They also focused on hardening existing types to work with new features, and more methods.
typescript-definitionstype-definitionshigh-qualitydtsdefinitions
SupernaviX/vvb
Jul 2020 - Dec 2022
Virtual Virtual Boy
Contributions:16 releases, 14 reviews, 447 commits in 2 years 5 months
virtual-boyboy
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