# Hunter C. > Senior Software Engineer at UnitedHealthcare | Co-Founder @ Spira | Ex Tesla | Ex DocuSign Location: San Francisco, California, United States Profile: https://flows.cv/hunterc From literally trying to reach outer space from building rockets, to working on the launch of the Model X and Model 3 at Tesla, to creating web applications that impact millions of people around the world, I'm an engineer at heart constantly looking for opportunities to improve and make things better. I have over 10+ years of developing software as a senior full-stack software engineer. Right now I work with TypeScript, React, GraphQL, Node.js, and Kubernetes, but I have worked with numerous technologies in other roles and am capable of learning any skillset as proven from the diverse fields I've worked in. I am a true polymath. I've won hackathons and have made numerous applications outside of work that help others. I love running and have earned a Boston Marathon qualifying time with a sub 2:55 marathon. Alone we can move fast. Together we can go further. Let’s connect. Email - hunter.casbeer@gmail.com Technologies I've used: JavaScript, TypeScript, Python, C, React, Redux, jQuery, BackboneJS, AngularJS, Node.js, Django, Flask, PostgreSQL, MySQL, MongoDB, HTML5, CSS3, Bootstrap, Git, Redis, Linux Ubuntu, Vagrant, Nginx, Gunicorn, Bash, Docker, Puppet, Let's Encrypt ## Work Experience ### Senior Full Stack Software Engineer, MCP + AI Agent Systems @ UnitedHealthcare Jan 2023 – Present - Tech: JavaScript/TypeScript, React, React Native, GraphQL, Node, Splunk, Kubernetes, Docker, AWS - Architected and led new line of business version, individual family plans, serving insurance to 1 mill+ - Implemented progressive canary deployment rollouts for 3 lines of business that impacts 20 mill+ - Built out plan for next year feature that was critical to the business retaining millions of dollars of ARR - Led and built out individual family plans mobile version for both Android and iOS ### Software Engineer @ Attentive Jan 2022 – Jan 2022 Attentive empowers the most innovative brands to create meaningful interactions through personalized text messaging and email. - Tech/Frameworks: JavaScript/TypeScript, React, Relay, GraphQL, DataDog, Playwright - Architected transactional emails based on transactional custom events used with 500 million+ messages - Integrated email validation, reducing email compose time by 90% - Built 50+ frontend components used across the entire organization - Integrated custom fonts across the entire email editor - Built export email HTML feature to enable users to use their HTML with other email service providers ### Senior Full Stack Software Engineer @ Arize AI Jan 2021 – Jan 2022 | San Francisco Bay Area Machine Learning Observability built for ML practitioners to automatically surface performance issues and trace the root cause. - Tech/Frameworks: JavaScript/TypeScript, React, Relay, GraphQL, Python, PostgreSQL, Kubernetes - Transitioned the entire site to using React Router v6 enabling the implementation of role-based authentication across the entire site, which added a new group plan revenue stream for the company - Built 20+ frontend components used across the entire organization ### Software Engineer @ DocuSign Jan 2019 – Jan 2021 | San Francisco Bay Area Since its inception in 2003, DocuSign has been on a mission to accelerate business and simplify life for companies and people around the world. We pioneered the development of e-signature technology, and today DocuSign helps organizations connect and automate how they prepare, sign, act on, and manage agreements. - Tech/Frameworks: JavaScript/TypeScript, React/MobX, AngularJS, Kusto (Telemetry) - Transitioned core site from AngularJS to React & MobX that is used by millions of daily global users - Built new “conditional” recipients UI used by 50k daily global users - Developed and maintained new global phone authentication UI - Added telemetry that monitored 20+ features rolled out - Identified & fixed 100+ bugs including an improved validation architecture & decreased render delays ### Full Stack Software Engineer @ Bay Area News Group Jan 2019 – Jan 2019 | San Jose, California Parent company to Convertly. ### Full Stack Software Engineer @ Convertly Jan 2019 – Jan 2019 | San Jose, California An organization within the Bay Area News Group, Convertly offers a super fast website creation platform with speed as our top priority. We also track conversions in Google Analytics and advertising platforms easily from entry, engagement, calls, chats, forms, cart and checkout. I worked on version 2 of the editor building out features and optimizations from our previous version. - Tech/Frameworks: React/Redux, JavaScript, GraphQL, Node, MongoDB, Redis - Refactored and optimized a large portion of the version 1 website editor panel - Co-designed in Figma and built 50+ React components for version 2 of the website editor - Configured frontend components to make the appropriate GraphQL API calls - Maintained/deployed ui-components package on npm and an AWS S3 server with Storybook.js ### Full Stack Software Engineer @ Purse Jan 2018 – Jan 2018 | San Francisco, California Purse allows users to name their own discount when shopping any product on Amazon by matching shoppers with earners - individuals who wish to exchange their Amazon gift cards for Bitcoin. I worked on improving front end load times and back end optimizations. - Tech/Frameworks: Backbone.js, JavaScript, Python, Django, PostgreSQL, Redis, Docker, RabbitMQ - Reduced download time via WebSockets by 90% for order transactions CSV files - Improved Amazon web scraper design allowing 50+ items to be on site - Identified and fixed multiple bugs on the site’s frontend and backend - Found the cause of most cancelations were due to Bitcoin arbitrage attempts; fixed by reducing order cancelation time from 30 minutes to 10 minutes ### Contract Software Engineer @ EveryTeam Jan 2018 – Jan 2018 | San Francisco, California EveryTeam is an early stage startup that is aiming to be the wikis for companies. Founded by developers from Github, EveryTeam is impacting the ways companies communicate internally. I collaborated with one of the founders directly to integrate drag and drop features with their core product. - Built new feature adding drag and drop for Draft.js (React text editor) with 5+ supporting technologies: Draft.js, Immutable.js, React, Styled-Components, HTML5 drag and drop API - Documented implementations directly with founder and CEO with a team of less than 10 engineers - Prototyped 10+ apps to solidify understanding of Draft.js - Codebase included: GraphQL, Go, PostgreSQL https://everyteam.com/ ### Community Manager @ BednBuild Jan 2016 – Jan 2018 | San Francisco, California Bed|n|Build was a network of hacker houses in the Bay Area that provided a landing pad for entrepreneurs and members of the startup community. I had the opportunity of being the Community Manager, hosting events and helping others increase their network as well as my own. I helped maintain different aspects of the company including the website. - Tech/Frameworks: WordPress, PHP, JavaScript, HTML5, CSS3 - Maintained company’s website - Managed hacker houses across the Bay Area - Managed the community within the hacker houses ### Co-founder and CTO @ Spira Inc. Jan 2016 – Jan 2016 | Cork, Ireland https://www.spirainc.com/ Spira is a biotech algae startup that aims to bring spirulina algae to people across the world primarily in the form of a drink that is refillable through a bioreactor to sustain a long-lasting supply of spirulina. - Tech/Frameworks: Python, C++, Arduino, Raspberry Pi - Developed mass-production algae bioreactor that produces spirulina at a ~95% quality production - Co-developed the company’s first drink – our core product, live spirulina algae in a bottle, one of the first drinks in the world to have a consumable living organism growing in a bottle https://rebelbio.co/spira-sustainable-food-spirulina/ ### Model X and Model 3 Launch Engineer Intern @ Tesla Motors Jan 2015 – Jan 2016 | Palo Alto, California My time at Tesla Motors involved me contributing to efforts improving the Model X front door motors as well as helping develop the software for the power front door option on the Model 3. - Tech/Frameworks: C, Python, LabVIEW, MATLAB - Programmed C firmware and PCAN GUI for Model 3 power front doors to control 6+ door states - Developed electric motor efficiency map using real-time NI LabVIEW and MATLAB software. - Reduced front door motor noise by 90% in all Model Xs by reprogramming voltages from CSV data ### Sensor Modules Engineer Intern @ Continental Jan 2012 – Jan 2014 | Auburn Hills, Michigan Continental is one of the largest automotive suppliers in the world. I had the opportunity to improve sensors and help lead identifying opportunities for various modules. - Identified cost-efficient alternative plastic for fuel sensors meeting performance specs saving $2 million - Led execution of FMEA (risk-comparison analysis) for proposed door handle mechanism - Performed troubleshooting for over 1000+ door handle sensors, transmission sensors, and fuel sensors ### Propulsion Engineer Intern @ SystemsGo Rocket Program Jan 2010 – Jan 2012 | Fredericksburg, Texas World News coverage - https://www.youtube.com/watch?v=bFQfaAc__yE SystemsGo works with high schools to build rockets through project based learning to help inspire the next generation of engineers. My first year I worked with a team of students to build and develop a rocket that broke the sound barrier (760 mph). The next year, I made rocket fuel by hand and developed the engine case that was integrated with a rocket to reach space in collaboration with NASA and Stanford University. - Built and presented a test plan to NASA executives for a rocket to reach space, 100,000 ft+ - Led engine case and fuel grain development (made in house) for rocket propulsion to break 3000 mph - Simulated designs with RockSim software for verification of calculated values with 99% accuracy http://www.systemsgo.org/ ## Education ### Electrical Engineering in Hardware/Software Kettering University ### Fredericksburg High School ## Contact & Social - LinkedIn: https://linkedin.com/in/hcasbeer --- Source: https://flows.cv/hunterc JSON Resume: https://flows.cv/hunterc/resume.json Last updated: 2026-03-22