Daniel He · Senior Full-Stack Engineer

Building resilient, product-grade software with measurable business outcomes.

I design and ship high-leverage software across frontend, backend, and platform layers — from UX polish to API architecture, performance engineering, and production reliability.

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Professional engineering workspace
Senior IC mindset · ownership · execution · collaboration

Business impact

+$1MM

enabled through shipped product capabilities

Onboarding speed

Weeks → Hours

for key customer data integration paths

Performance

~80%+

frontend load-time improvements across critical pages

Value proposition

Core strengths

  • End-to-end delivery: translating product goals into reliable systems and polished user-facing experiences.
  • Performance + scalability: identifying bottlenecks quickly, tuning systems pragmatically, and improving throughput/user experience.
  • Senior engineering posture: ownership, clear communication, and decision-making that balances speed, quality, and maintainability.

Career timeline

Experience

Senior Full-Stack Engineer

Mandrel

Dec 2024 — Apr 2025

  • Built in-app purchase order creation/versioning integrated with existing document-linking flows.
  • Resolved API + DB latency bottlenecks across GraphQL resolvers and async jobs.
  • Improved LLM-based semantic document processing and similarity linking quality.

Senior Software Engineer

ClosedLoop.AI

Apr 2023 — Mar 2024

  • Code owner for three production services with on-call ownership.
  • Delivered backend, UI, and QC framework for ACO products; supported >$1MM in business impact.
  • Handled complex escalations across engineering, implementation, and customer success.

Software Engineer

ClosedLoop.AI

Apr 2021 — Apr 2023

  • Shipped full-stack features for a HIPAA-aware data science platform.
  • Reduced onboarding time from weeks to hours via a Connectors API.
  • Improved frontend performance by ~80%+ across key product surfaces.

Process Engineer

ExxonMobil

Apr 2019 — Jul 2020

  • Led multi-site rate tests to maximize polypropylene output (>$10MM/year impact).
  • Automated process controls and operational metrics for faster decisions.

Capabilities

Technology stack

Languages

TypeScriptJavaScriptPythonGraphQLSQLHTML/CSS

Core Stack

ReactNext.jsNode.jsPostgreSQLRedisTailwind

Infrastructure & Tooling

AWSGCPDockerTerraformDatadogGitHub Actions

Foundation

Education & credentials

  • AWS Certified Data Engineer — Associate (2025)
  • UT Austin — B.S. Chemical Engineering (Summa Cum Laude, 3.98)
  • Elements of Computing Certificate · Cockrell Scholarship (full ride)
  • Research publication: Dynamics of Lithium Insertion in Electrochromic Titanium Dioxide Nanocrystal Ensembles

Let’s connect

Contact

For opportunities and collaborations, the best way to reach me is email.

danielhe.mlp@gmail.com