Looking for a job

Yuang Sun

@yuangsun

Message

I build full-stack and systems software, from AI platforms to fuzzing tools.

United States

Message

What I'm looking for

I'm looking to build production software across full-stack, backend, systems, or security-focused engineering work, where I can collaborate with users and stakeholders to turn requirements into reliable products.

I've built and shipped a React, FastAPI, and PostgreSQL training platform for mortgage servicing agents through MortyAI's industry-sponsored capstone with Select Portfolio Servicing. I developed APIs, role-based access control, session persistence, automated evaluation, and performance analytics.

I integrated LLM evaluation and retrieval pipelines to assess conversations for policy compliance, accuracy, empathy, and resolution quality, collaborating directly with stakeholders in a four-person engineering team.

I've also worked on Java/JSP industrial applications at China Baowu/Baosight and built fuzzing harnesses for GPXSee, finding seven reproducible crashes and two hangs, including a CVE-assigned finding.

Experience

Work history, roles, and key accomplishments

Software Engineer

MortyAI

Aug 2025 - May 2026 (9 months)

Built and shipped a full-stack voice- and text-based training platform using React, FastAPI, PostgreSQL, and SQLAlchemy for mortgage servicing agents. Designed Python REST APIs and integrated LLM-based evaluation and retrieval pipelines.

React fastAPI PostgreSQL SQLAlchemy REST APIs LLM Integrations Python

Software Engineering Intern

China Baowu / Baosight

May 2025 - Aug 2025 (3 months)

Worked with Java/JSP-based industrial applications on the iPlat4J enterprise platform, supporting internal application workflows and user-facing interfaces. Deployed Playwright-based UI automation tooling for end-to-end testing.

Java JSP IPlat4J Playwright UI Automation Testing