Young Jin Heo

Multi-tenant wine-storage SaaS. Stack: TypeScript · React 19 · Next.js 16 · AWS Amplify Gen 2 · CDK · Lambda · DynamoDB · Cognito · AppSync

- Implemented the authorization system — a hierarchical ACL model with capability-based roles across 20+ AWS Lambda handlers, including an async, checkpointed, resumable propagation job that re-stamps permissions across deep location trees off the request pat

- Drove the deprecation of legacy duplicate-detection systems and shipped their replacement end to end — data modeling, implementation, integration testing, and production validation
- Delivered a Kafka dual-publishing migration exposing job copy data through an internal event-streaming platform, coordinating schema changes with the Japan-based team owning a downstream machine learning data platfo

- Co-led a bulk repost-detection endpoint in Java/Spring for the Indeed+ team in Japan, designing the workflow and splitting delivery with a teammate
- Migrated a legacy machine learning inference system producing fraud and quality signals on job postings onto a centralized ML feature platform (feature store), reconciling inconsistent field naming and data types with data scientists
- Root-caused

- Led technical integration with Paychex, enabling their users to sponsor jobs directly through Indeed's API — influenced ~$500K in revenue since launch
- Built full-stack review tooling in React and Java/Spring — an internal content-moderation platform and a document review pipeline for EU Digital Services Act (DSA) compliance — supporting regulatory compliance workflows
- Implemented agent quali

- Built a React demo application for Indeed's Budget API to support third-party integrations, authoring the API documentation and fielding partner integration questions

WINS is a Korean cybersecurity company building proprietary security solutions for domestic and global enterprise markets.

- Automated web UI regression testing with Robot Framework and Selenium, validating product functionality across release candidates
- Pulled test case oracles and sent back test results to TestLink to capsulize reports
- Conserved 4-8 hrs/wk and increased test refinement fr

- Led a squad conducting continuous border surveillance at the Korean Demilitarized Zone during mandatory national military service
- Assisted superior officers create a timetable checking each men's test status and constructed a system that would distribute duties equally among men, which quelled their complaint
- Trained to react immediately to multiple levels of enemy invasions and as a result,

Seoul National University is Korea's top-ranked national research university.

- Analyzed Bluetooth signal, light sensor, and chatbot interaction logs from TV remote controls to identify drivers of audio satisfaction
- Presented cluster-and-classification strategy of processed raw data, allowing for discovery of patterns among households to ultimately construct standardized models per household c

- Managed middle school students by reviewing incorrect homework problems and teaching concepts they did not understand from teacher’s lecture by promoting peer tutoring
- Guided students build confidence in mathematics by consulting their difficulties and suggesting methods to realize self-directed learning which is not common in Korea

Managed middle school students by reviewing homework and teaching concepts, promoting peer tutoring and self-directed learning.

Coursework Highlights: Software Engineering, Operating Systems, Web Systems, Machine Learning, Intro to Computer Architecture, Data Structures and Algorithms

Bachelor of Engineering in Computer Science from the University of Michigan, with coursework in software engineering, operating systems, web systems, machine learning, computer architecture, and data structures and algorithms.