Front-end software engineer · U.S. Army veteran

Greg Machat

I build accessible, scalable applications with React, TypeScript, and Next.js, from production UI systems to AI-powered full-stack products.

About me

Production-minded engineering with a leadership foundation.

I specialize in owning user-facing features from concept through production, pairing thoughtful UI engineering with the calm, accountable leadership I developed as an Army combat medic sergeant.

Front-End Engineering

Experienced in building reusable React interfaces, accessible component systems, responsive workflows, and AI-enabled product features inside large-scale production applications.

Army Leadership

Led and mentored small medical teams in high-pressure operational settings, including deployment to Afghanistan, and built a Python process improvement that eliminated thousands of hours of manual data entry.

Current toolkit

Skills built for modern product teams.

  • JavaScript / TypeScript
  • React / Redux
  • Next.js / Tailwind CSS
  • HTML / CSS
  • Accessible UI components
  • API and AI integration
Experience

Shipping reliable interfaces at production scale.

A progression from intern to primary front-end engineer, with ownership across customer care, interviewing, accessibility, and internationalization.

Yello.co

Software Engineer II

December 2022 – October 2026

Chicago, Illinois

  • Served as the primary front-end engineer on the Customer Care team, resolving urgent production issues and shipping reliable fixes under tight deadlines.
  • Built user-facing AI features and reusable React interfaces within a large-scale production application.
  • Owned front-end delivery across multiple teams in partnership with engineering, QA, and product stakeholders.

Yello.co

Software Engineer I

September 2021 – December 2022

Chicago, Illinois

  • Led front-end development of a video interviewing platform integrating Google Meet, Zoom, Microsoft Teams, and proprietary video.
  • Built scheduling interfaces supporting thousands of interviews across clients and time zones.
  • Created reusable, accessible UI components supporting consistent, WCAG-aligned experiences.

Yello.co

Software Engineer Intern

June 2021 – September 2021

Chicago, Illinois

  • Improved accessibility across user-facing workflows for people with a range of accessibility needs.
  • Enhanced existing Slim, SCSS, jQuery, and React code to create a more intuitive user experience.
  • Implemented dynamic translations for international users and shipped interface enhancements through iterative Agile development.

United States Army

Combat Medic Sergeant

August 2017 – June 2021

Fort Bragg, North Carolina

  • Led and mentored medical teams in demanding operational environments, including deployment to Afghanistan.
  • Applied Python to eliminate a large manual data-entry burden and improve an internal process.
Engineering training

Code Platoon

Full Stack Software Engineering Bootcamp · 2021

Education

Rowan University

B.A., Health and Physical Education · 2016

Flagship project

VegasIntel is the project I’m most proud to have built.

Designed, engineered, and deployed independently from the data layer through the final interface.

Built from first principles

The framework underneath this portfolio.

Earlier work

Projects that shaped the foundation.

React · Node.js · Agora

Connectify

A rapid video-chat experience where users can create or join channels in seconds, powered by Agora's real-time communications API.

View source

Django · React · Firebase

Code Room

A collaborative coding platform combining a real-time IDE, code execution, video chat, and instructor-managed programming challenges.

Watch presentation Code Platoon capstone project

Django · React · Edamam API

Nutrify

A recipe creation and sharing experience that generates complete nutritional profiles for favorite recipes in seconds.

View source Full-stack nutrition platform

React · Next.js · Vinext · Canvas

Atlas of Music

An interactive map and globe for discovering where songs were written, recorded, or set and where artists began. Explore curated stories or add new artist–place connections to the growing atlas.

View source Interactive music discovery platform