I'm Xinyi Lin — a full-stack software engineer building real-world tools at the intersection of software and healthcare.

I've spent the last two years inside a high-volume cardiology clinic watching clinicians fight their EHR every day, and I build software that tries to do better.

A portfolio-grade EHR demo covering scheduling, clinical charting, billing, document management, and organization/facility administration. Modeled on the workflows I see in a real clinic — not generic CRUD.

• Clinical charting with SOAP progress notes (draft / signed / unsigned states), encounter lifecycle, and a 68-code CPT catalog
• Configurable fee schedules with payer and facility overrides
• Patient timeline that unifies appointments, encounters, medications, and allergies into one chronological view via a shared timeline component
• Security: SSN encryption at rest (Fernet), JWT + HTTP-only refresh cookies, CSRF protection, role-based permissions scoped per facility, and an audit log for sensitive actions
• Typed end-to-end via OpenAPI codegen (drf-spectacular + openapi-typescript)
• Deployed on AWS Amplify (frontend) + Render (backend), with PostgreSQL on Amazon RDS, Cloudflare R2 object storage, and Docker Compose for local dev

🔗 Live demo: careflow.xinyiklin.com 💻 Code: github.com/xinyiklin/careflow

A local-first webapp that imports a job posting, scores how well your resume actually fits it, and runs honest, evidence-based AI polish — no fabricated achievements, strict recruiter-style review.

• Recruiter-style review engine that scores resume-to-role fit, capping scores at what the resume actually evidences
• Multi-provider AI polish across 10+ hosted, local, and CLI backends (Claude / OpenAI / Gemini / OpenRouter / Ollama and more) with a deterministic local fallback
• Anti-fabrication by design: schema-validated, section-scoped suggestions surfaced as accept/edit/discard diffs, a grounded-output sanitizer, and 120+ offline eval probes
• Job-link import (Workday / Greenhouse and more) plus a browser fit-check extension
• LaTeX/PDF export via Tectonic and an on-disk application tracker — everything stays on your machine

🔗 Live demo: xinyiklin.com/rolefit-ai 💻 Code: github.com/xinyiklin/rolefit-ai

A focused extraction of RoleFit AI's editor into a standalone Jake's-style resume editor — inline structured editing, drag-and-drop reordering, faithful LaTeX styling, and one-click PDF / .tex export via Tectonic.

• On-page structured editing with drag-and-drop sections, entries, and bullets (@dnd-kit)
• Faithful Jake's template rendering with layout, spacing, and typography controls
• Dockerized and deployed to AWS EC2 (custom domain, HTTPS) via a GitHub Actions CI/CD pipeline
• Privacy-first: resume lives in localStorage; rendering only calls the app's own LaTeX endpoints

🔗 Live demo: jakeforge.xinyiklin.com 💻 Code: github.com/xinyiklin/jakeforge

Languages: Python, TypeScript, JavaScript, Java, C++, SQL, HTML/CSS

Frontend: React, TypeScript, Vite, React Query, React Router, Tailwind CSS

Backend: Django, Django REST Framework, Node.js, REST APIs, JWT + CSRF auth

Data & Storage: PostgreSQL, Cloudflare R2 / S3-compatible object storage

Tooling & Deployment: Git, Docker, AWS (Amplify, RDS, EC2), GitHub Actions CI/CD, Render, ESLint, Prettier, pre-commit hooks

• 🏥 Two years inside a cardiovascular clinic — real exposure to EHR migrations, scheduling bottlenecks, and clinical workflow design
• 🛠 Comfortable across the full stack: schema design, REST APIs, React frontends, auth/security, deployment
• 🌱 Currently going deeper on system design, OpenAPI tooling, and clinical informatics
• 🌐 Bilingual in English and Mandarin Chinese

• 📧 Email: xinyiklin@gmail.com
• 💼 LinkedIn: linkedin.com/in/xinyiklin
• 🧍 Portfolio: xinyiklin.com

Currently exploring early-career and SWE I roles in healthcare tech and full-stack — always open to a coffee chat about clinical software, full-stack architecture, or building tools clinicians actually want to use.