Wonjun Jang
Software Engineer
Your average tech bro,
software engineer based in St.Louis, MO
intro
I’m a software engineer who thrives at the intersection of product, performance, and polish. From crafting sleek frontends to architecting AI-powered backends, I build systems that are as thoughtful as they are scalable.
Most recently, I worked at Paula’s Choice as a Frontend Developer for the Korea and Japan markets, leading UI initiatives and shipping accessible, high-performance features to a global user base. Before that, I helped build both frontend and backend systems at an early-stage proptech startup, and earlier, contributed as a QA intern at a large enterprise. While finishing my degree, I worked on perception AI projects—experimenting with object detection and anomaly detection models. Currently, I’m building automation tools powered by AI agents—fast-moving products that blend smart UX with serious technical depth.
Outside of work, you’ll find me doing CrossFit, logging long runs, swimming or geeking out on side projects. I’m always chasing growth—whether it’s building better software, stronger habits.
- aug 2022 - oct 2024
Paula’s Choice
Frontend Developer
Led engineering efforts across UI/UX for the KR/JP region while coordinating closely with global teams. My work spanned product optimization, data-driven experimentation, and cross-functional collaboration—shaping features that drove real revenue impact. I built and shipped tools used by customers worldwide, tackled high-priority bugs under pressure, and acted as the technical bridge between regions to ensure smooth product rollouts.
- React
- Typescript
- styled-components
- Storybook
- Figma
- Salesforce
- Node.js
- Azure
- jun 2021 - aug 2022
Proptech Startup(EnkorWithUs)
Full Stack Developer
Joined as one of the first full-time engineer and helped take the product from zero to a fully operational housing platform. I built and scaled the entire stack—from map-based property search to host onboarding tools—while working closely with users and non-technical stakeholders. I led key product iterations based on real customer feedback, developed internal tooling to support growth, and contributed directly to an 8x revenue increase during my time there.
- Next.js
- Typescript
- Tailwind CSS
- Storybook
- Figma
- Node.js
- AWS
- Stripe
- PostgreSQL
- NestJS
- Contentful
- jul 2020 - aug 2020
Concentrix
QA Assistant
Testing and ensuring the quality of software products. I worked closely with developers and product managers to identify and resolve issues, and provided feedback to improve the overall quality of the product.
- Cypress
- Jira
- Confluence
- Outlook
- Excel
- sep 2019 - jan 2020
Hana Vision Tech
Software Engineer Intern
Worked as a research assistant, developed real-time anomaly detection systems for smart surveillance use cases. I built data pipelines to preprocess surveillance footage and benchmarked traditional ML models against deep learning approaches like YOLO and CNNs. The deep learning models consistently outperformed legacy techniques—delivering over 94% accuracy and proving viable for production deployment.
- YOLO
- CNN
- Python
- Numpy
- Pandas
- Pytorch
