03 : About Me
Yun Sung Choi
Hi, my name is Yun Choi. You can also call me Jason. I'm a full-stack software developer based in Austin, TX, specializing in Ruby on Rails and React (TypeScript), and I hold a Public Trust Security Clearance. I build and ship full-stack web applications end to end — from database design to the UI.
Outside of work you'll usually find me on the golf course, behind a camera, or pairing wine with a good meal.
Résumé
Skills
Work Experience
Ruby on Rails Developer (Full-Stack) — USCIS 2022 – Current
Alpha Omega, 2023/10 – Current | Sev1Tech, 2022/08 – 2023/10
Ruby on Rails, JavaScript, TypeScript, React, Redux, Kafka, Jira, Git, GitHub, Docker, Kubernetes, Vault, Jenkins, RSpec, Capybara, Postgres, ArgoCD, Sidekiq, XML, Flipper, PaperTrail, SQL, Splunk, OAuth, AWS S3, SASS, Matomo, FactoryBot, Redis
- Worked as a full-stack developer on large government projects built with Ruby on Rails and React (TypeScript)
- Improved asylum and refugee case processing efficiency by significantly reducing processing time, enabling the capacity to process 250% more cases than previously achievable
- Collaborated with an agile team of 7 and 4 other teams to digitalize the application process, determine solutions for the user experience and stakeholder, and handle user support
- Implemented an offline saving feature to safely store user data and prevent loss from an unstable internet connection
- Worked in a TDD environment, writing tests with RSpec and Capybara (Selenium) for Ruby, and Jest for React
- Proficient in Agile and Kanban methodologies, driving efficient and collaborative development processes
Full-Stack JavaScript Developer — Koloni 2021/11 – 2022/08
JavaScript, TypeScript, React, Redux, Google Maps, Algolia, Figma, Git, GitHub, AWS, Material-UI
- Created an app customizer where users can see the actual preview of their own app in action as they customize it
- Designed the UX/UI based on continuous user feedback, raising the user-revisit rate by 20%
- Enhanced the application's features by fixing bugs and optimizing overall performance, reliability, and efficiency
Personal Projects
- Furnitsy — Ruby on Rails, React, Redux
- Shift Manager — Ruby on Rails, Docker — in Prod
- Todo List — MongoDB, Express, React, Node.js
- Word Scramble — React, JavaScript, HTML, CSS
- Chicken Run — JavaScript, HTML5, CSS, Canvas
- Warehouse Furniture — Ruby on Rails, Stripe, Devise, AI chat
Education
App Academy 2021
Austin Community College 2010 – 2012
Certificates
- Full-Stack Development (App Academy)
- Security Awareness (USCIS)
- Insider Threat Awareness (USCIS)
Languages
Korean (Native) | English (Fluent)
Hobbies
Golf | Coding | Photography | Food & Wine Pairing