Zachary Eisinger, Developer in Snoqualmie, WA, United States
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Zachary Eisinger

Verified Expert  in Engineering

Software Engineering Developer

Snoqualmie, WA, United States
Toptal Member Since
August 26, 2021

Zachary is a full-stack developer with experience developing IaaS to power secure, fast, and reliable continuous integration and continuous deployment. He works intensively with DevOps practices and runs GitHub actions and Azure Pipelines to improve their DevOps products. In addition, Zachary has worked in the eCommerce space, focused on authentication and user identity work.


Node.js, Amazon Web Services (AWS), Amazon Cognito, SQL, Software Engineering...
Open Source, C#, Azure, GitHub, GitHub Actions, Software Engineering...
Object-oriented Programming (OOP), Software Engineering, C#, SQL, C#.NET, .NET...




Preferred Environment

Visual Studio Code (VS Code), Microsoft, C#, C#.NET, .NET

The most amazing...

...project I've collaborated on helped shape GitHub Actions' YAML syntax.

Work Experience

Senior Software Engineer

2020 - PRESENT
  • Selected and implemented an experimentation and feature-flagging platform for the organization while collaborating with security and data teams.
  • Improved authentication service experience and security.
  • Drove the implementation of a new CI provider across the organization.
Technologies: Node.js, Amazon Web Services (AWS), Amazon Cognito, SQL, Software Engineering, Object-oriented Programming (OOP), React, JavaScript, HTML5, Relational Databases

Senior Software Engineer

2019 - 2020
  • Powered GitHub Actions and Azure DevOps pipelines as part of the infrastructure team.
  • Guided improvements with surface insights that reduced machine lifecycle overhead for virtual environments and hosted agents used by Actions and Pipelines.
  • Maintained and improved the Actions and set up of the .NET action used in the .NET Core starter workflow.
Technologies: Open Source, C#, Azure, GitHub, GitHub Actions, Software Engineering, Object-oriented Programming (OOP), C#.NET, .NET, JavaScript, HTML5, Relational Databases

Senior Software Engineer

2015 - 2019
  • Created a metric-driven microservice CI/CD pipeline for reliable and fast testing and efficient infrastructure usage.
  • Collaborated with partner teams to improve the usability and advocated for customer-aligned Azure Pipelines—formerly Visual Studio Team Services.
  • Reduced server usage costs for testing by 40% while increasing test coverage.
Technologies: Object-oriented Programming (OOP), Software Engineering, C#, SQL, C#.NET, .NET, JavaScript, HTML5, Relational Databases

Web Developer

2012 - 2014
Matrix Group International
  • Corresponded with clients and staff to improve and develop web applications.
  • Audited and implemented security fixes for XSS and SQL injection vulnerabilities.
  • Maintained and implemented new features for clients' websites as the primary engineering owner.
Technologies: Web Security, Software Engineering, Object-oriented Programming (OOP), SQL, JavaScript, HTML5, MySQL, Relational Databases

Set up .NET GitHub Action
Acted as the primary maintainer of this action during my time at GitHub, among other responsibilities. I responded to issues and created PRs to address requests. Improved the repo's health by removing node_modules, revamping documentation, creating templates for bugs, and creating a process for contributions to be submitted.
2010 - 2014

Bachelor's Degree in Computer Science

University of Maryland - College Park, MD


Node.js, React


GitHub, Amazon Cognito


.NET Core, .NET


Object-oriented Programming (OOP)


C#, SQL, C#.NET, JavaScript, HTML5


Azure, Microsoft, Amazon Web Services (AWS), Visual Studio Code (VS Code)


Relational Databases, MySQL


Software Engineering, GitHub Actions, Open Source, Web Security

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