Hyejin Ahn

Software engineer & Maker

📧 hyejinahn0619@gmail.com

🌍 Austin, Texas

🏠 Website | 🔗 Github | 🔗 LinkedIn

Summary

Senior Full-Stack Engineer with 8+ years of experience building SaaS products across healthcare, ecommerce, and social platforms. Experienced in Elixir/Phoenix, React, Ruby on Rails, PostgreSQL, and cloud-based web applications, with a track record of owning features end-to-end, collaborating across functions, and shipping products that solve real operational problems. Strong interest in mission-driven software, healthcare workflows, and building tools that improve outcomes for both teams and end users.

Corporate Experience

Senior Software Engineer
Alluvium Health (formerly Blockit), Texas | 2024 - Present
  • - Build and ship full-stack healthcare SaaS features using Elixir/Phoenix LiveView and React, focused on scheduling, referral, provider directory, and patient intake workflows.
  • - Design and implement dynamic workflow logic for booking and screening experiences, including questionnaire-driven behavior, start-date calculations, and configurable scheduling rules.
  • - Work on healthcare integrations and external data pipelines involving provider, location, and schedule data, supporting normalization, import tooling, and operational reliability.
  • - Improve internal admin and operational tooling to reduce manual work, increase auditability, and support customer-specific workflows more efficiently.
  • - Collaborate closely with engineering, product, design, and QA to scope work, review implementations, and ship iterative improvements quickly.
  • Elixir/Phoenix LiveView, React, PostgreSQL, Healthcare SaaS
Full Stack Software Engineer
BigCommerce, San Francisco, USA | 2021 - 2023
  • - Contributed to the development and maintenance of Page Builder, BigCommerce’s core product, enabling users to create custom websites via drag-and-drop components.
  • - Developed and maintained microapps across frontend and backend, ensuring seamless daily operations for merchants.
  • Ruby on Rails, Scala, PHP, React, Microservices
Senior Software Engineer
PatientsLikeMe, San Francisco, USA | 2020
  • - Led a feature development team of four, including three software engineers and one QA engineer.
  • - Collaborated with product designers, operations, and another engineering team.
  • - Partnered with the product team to define scope, breakdown, and prioritization of new features.
  • - Led daily pair programming sessions and mentored junior developers.
  • Ruby on Rails, PostgreSQL, React, Jest, Elasticsearch
Full Stack Developer
Qurate Inc., Fukuoka, Japan | 2018 - 2019
  • - Developed and maintained a B2B social content management platform, focusing on publishing and analytics features integrated with major platforms like Facebook, LinkedIn, Instagram, and Twitter.
  • - Developed and launched a new social network management dashboard in collaboration with Toppan, one of the largest print companies in Japan.
  • Ruby on Rails, PostgreSQL, Sidekiq, Vue.js, Unit testing
Full Stack Developer
YsPeople, YsEpicure, Perth, Australia | 2017 - 2018
  • - Built and integrated full-stack solutions, including Facebook’s API for a news site and payment gateways (PayPal and an Australian provider) for an online store.
  • Ruby on Rails, jQuery, HTML/CSS
Full Stack Developer - Remote
Team Milestone, South Korea | 2016 - 2017
  • - Developed a web app for a custom-tailored suit company to manage customer lifecycle, measurements, and photos.
  • Ruby on Rails, jQuery, HTML/CSS

Personal Projects

  • - Personalized online memorial sites. Actively used by thousands of Korean users.
  • Ruby on Rails, ReactJS, HTML/CSS, Heroku
  • - Fab Academy 2020 final project
  • - Smart miniature house designed in Fusion 360, constructed with laser cutter
  • - Features include an elevator, room light control, garage door, and a swimming pool with a pump and motor.
  • - All features are remotely controllable via a web interface using Wi-Fi and Raspberry Pi.
  • Laser cutting machine, 3D printer, CNC 3-axis milling machine, PCB milling machine, Circuit design, Microcontroller programming
MBTI app | 2019
  • - The first MBTI app made for Korean users
  • - Displays information about personality types, celebrities and compatibility in a clean interface
  • - Top 30 in iOS App Store Korea
  • Flutter, Ruby on Rails

Education

Fab Academy, Amsterdam, Netherlands | 2020
  • The famous 6-month intensive digital fabrication course based on MIT’s popular rapid-prototyping course How To Make (almost) Anything, both taught by Prof. Neil Gershenfeld. Details and documentation available here.
Dev Bootcamp, San Francisco, USA | 2016
  • Web development course
Sungkyunkwan University, Seoul, South Korea | 2010 - 2015
  • Electrical and electronics engineering - Bachelor's degree
Technische Universität Chemnitz, Chemnitz, Germany | 2014
  • Electrical and electronics engineering - Exchange student program