Available for new roles

Senior full-stack
developer
based in New York.

6+ years shipping scalable React applications and financial systems. I build things that are fast, clean, and used by thousands of people.

View projects guoallen38@gmail.com

Currently @ Marsh McLennan·Looking for my next role

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React·TypeScript·Next.js·Node.js·D3.js·Redux·Postgres·Docker·Kubernetes·TailwindCSS·Firebase·REST APIs·React·TypeScript·Next.js·Node.js·D3.js·Redux·Postgres·Docker·Kubernetes·TailwindCSS·Firebase·REST APIs·

Full-Stack·6+ Years·New York City·Open to Work·Fintech·E-Commerce·No-Code·Performance·Agile·Code Reviews·UI/UX·Scalable Systems·Full-Stack·6+ Years·New York City·Open to Work·Fintech·E-Commerce·No-Code·Performance·Agile·Code Reviews·UI/UX·Scalable Systems·

Years of professional experience

Global users served daily

Full-stack projects shipped

Technologies in active use

Stack

Selected projects

Click a card to read the case study

01 — FINTECH

Finance Flow

Personal finance dashboard with real-time data visualization and budget tracking.

Next.jsTypeScriptD3.jsFirebaseTailwindCSS

02 — FINTECH

Trading Order Entry UI

High-speed order entry system with natural language parsing, draft autosave, and real-time validation.

Next.jsTypeScriptTailwindCSSTanStack TableExpress

03 — COMMUNITY

Post Guru

Forum platform for discovering posts and threaded community discussions.

Next.jsTypeScriptMaterial UIRedux

04 — NO-CODE

SiteLite

No-code webpage builder — publish a site without writing a single line of HTML.

ReactReduxFirebaseNode.jsJavaScript

05 — E-COMMERCE

HAVA's Runeshop

Full-stack fantasy e-commerce with guest and user flows, cart, and checkout.

ReactReduxExpressPostgresJavaScript

Experience

Senior Software Developer

Marsh McLennan · New York City

Led development of scalable React applications for financial journal systems, building reusable UI components and frontend architecture. Developed backend services using Python (FastAPI) to support journal processing, validation, and data workflows. Built a Cash Application platform automating payment-invoice matching, significantly reducing manual effort. Drove front-end and back-end performance optimizations for thousands of global users. Mentored junior developers through code reviews and career development.

ReactTypeScriptJavaScriptPythonFastAPINode.jsMaterial UIPostgreSQLJest

2022 → Present

Application Engineer I

Paradyme Management Inc. · Greenbelt, MD

Built and maintained RESTful APIs using Python to support data workflows for a government dashboard application. Developed UI features using Vue.js, improving usability and performance. Added Jest unit tests to increase code coverage and reduce bugs. Managed containerized deployments on OpenShift in an Agile environment.

VueJSPythonJavaScriptOpenShiftJest

2020 → 2022

Let's work together

Get in
touch.

guoallen38@gmail.com

Senior full-stackdeveloperbased in New York.