Daniel He

Senior Full-Stack Software Engineer

Mid-level full-stack engineer with 4+ years of experience looking to make an immediate impact on a product-focused team. I specialize in React, Node.js, and cloud technologies, with a proven track record of improving performance and delivering results.

Get in touch Read my blog

About Me

I'm a senior full-stack software engineer with 4+ years of experience building scalable web applications and data platforms. My expertise spans the entire stack, from React frontends to Node.js backends, with deep knowledge of cloud platforms and modern development practices.

I've contributed to significant business outcomes, including helping secure >$1MM in new business through innovative product development and improving customer time-to-value from weeks to hours through strategic API development.

Professional Experience

\n
\n
\n
\n

Senior Full-stack Engineer

\n
\n Mandrel\n Dec 2024 - April 2025\n
\n
\n
    \n
  • Implemented an in-app purchase order creation and versioning tool that folds into existing document-linking flows
    • \n
  • Diagnosed and resolved network and database latency issues, drastically improving performance in key GraphQL resolvers
    • \n
  • Enhanced accuracy of LLM-based semantic document processing and similarity-based document-linking
    • \n
\n
\n \n
\n
\n

Senior Software Engineer

\n
\n ClosedLoop.AI\n April 2023 - March 2024\n
\n
\n
    \n
  • Code owner of three key services with on-call engineering operations duty
    • \n
  • Implemented backend, UI, and QC framework for ACO Solutions products, contributing to >$1MM in new business
    • \n
  • Resolved complex client issues as 3rd-tier escalation after implementation and customer success teams
    • \n
\n
\n \n
\n
\n

Software Engineer (Full-stack)

\n
\n ClosedLoop.AI\n May 2022 - April 2023\n
\n
\n
    \n
  • Full-stack development on core data science platform with HIPAA compliance considerations
    • \n
  • Improved customer TTV by shortening key data onboarding from weeks to hours with Connectors API
    • \n
  • Reduced page load times by 80%+ on over a dozen pages through performance optimizations
    • \n
\n
\n \n
\n
\n

Software Engineer (Front-end)

\n
\n ClosedLoop.AI\n April 2021 - May 2022\n
\n
\n
    \n
  • 6th engineer on team during fast-paced growth, contributing to $34M Series B funding round
    • \n
  • Led JS to TypeScript conversion of React codebase, reducing client-side errors by >90%
    • \n
  • Built UI for automated machine learning and medical terminology management features
    • \n
\n
\n
\n \n

Technical Skills

Languages & Core

  • JavaScript (ES2015+)
  • TypeScript
  • Python
  • GraphQL
  • HTML/CSS
  • Scala

Frameworks & Libraries

  • React & Next.js
  • Node.js
  • Tailwind CSS
  • MongoDB & PostgreSQL
  • Redis

Tools & Platforms

  • AWS/GCP ecosystems
  • Docker & Terraform
  • Git & GitHub
  • Vercel & Heroku
  • Datadog & Firebase
  • Figma

Latest Blog Posts

View all posts

Education & Certifications

AWS Certified Data Engineer - Associate

2025

Professional certification in AWS data engineering services and best practices

University of Texas at Austin

2018

B.S. in Chemical Engineering
Summa Cum Laude (3.98 GPA)
Elements of Computing Certificate
Virginia & Ernest J. Cockrell, Jr. Scholarship (Full ride)

Research Publication

2018

"Dynamics of Lithium Insertion in Electrochromic Titanium Dioxide Nanocrystal Ensembles"

Get In Touch

I'm always interested in new opportunities and collaborations. Feel free to reach out!

LinkedIn GitHub
New York, NY