Jayson Monterroso

Frontend-Focused Fullstack Engineer

Open to opportunities

Hello! I'm Jayson, a Frontend-Focused Fullstack Engineer with 15+ years specializing in React/TypeScript ecosystems. I've led the development of scalable UI component libraries, architected frontend platforms serving thousands of users, and scaled startups from $0 to $1M+ ARR with exceptional user experiences.

While I'm most experienced in frontend development, I'm also proficient in backend development, having architected payment processing systems, microservices, and Node.js APIs. My expertise spans modern frontend frameworks, cloud infrastructure (AWS/Kubernetes), and mobile development with a focus on performance optimization, accessibility, and creating exceptional user experiences.

I excel at mentoring engineering teams, leading frontend architecture decisions, and transforming complex business requirements into elegant, scalable solutions. I'm seeking fullstack roles with a frontend focus or frontend positions where I can leverage my deep UI/UX expertise and leadership experience.

Featured Experience

Under Armour

Senior Software Engineer

Under Armour | Intevity

2025

  • • Replaced Mulesoft APIs with scalable Node.js microservices, reducing licensing costs and enabling complete in-house API ownership
  • • Developed event-driven architecture using AWS SQS/SNS, enhancing throughput and reliability
  • • Integrated microservices with core enterprise systems (PredictSpring POS, Aptos, SFCC)
Node.js AWS Microservices SQS/SNS
Notch

Software Engineer III

Notch

2022 - 2025

  • • Architected payment processing platform with OCR capabilities, processing thousands of invoices monthly
  • • Led development of AP/AR product platform with Node.js APIs and TypeScript React frontend
  • • Developed shared UI component library and migrated native apps to web using Capacitor
React TypeScript Node.js Kubernetes
StackHawk

Front End Engineer

StackHawk

2020 - 2021

  • • Scaled platform from $0 to $1M ARR while leading a team of 5 engineers
  • • Built security testing platform from early stage through production, focusing on UX and accessibility
  • • Migrated marketing website to GatsbyJS + Headless CMS, improving speed and SEO
React TypeScript Gatsby Leadership
View all experience

Key Achievements

15+
Years Experience
React/TypeScript & Node.js
$1M+
ARR Scaling
Startup to scale
5x
Performance Gain
10s → 2s load time
10+
Companies
Fortune 500 & startups

Core Technologies

Primary Stack

React TypeScript React Query Zustand Tailwind Node.js Jest AWS

Featured Projects

Legal Management System

Consortium Legal

Full-stack migration of legacy Windows application to modern web platform for prestigious Costa Rican law firm, managing cash flow and financial transactions.

MEAN Stack MongoDB AngularJS Node.js

E-Commerce Platform

Stance Socks

UI development for global e-commerce website, implementing full landing pages for campaigns and optimizing components using BEM methodology.

MEAN.io Magento WordPress Foundation
View live demo

Real Estate Platform

Tansler

Frontend development for Airbnb-like real estate platform with bidding system, integrating Google Maps API and RESTful services.

AngularJS RESTful API Google Maps
View all projects

Recommendations

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Latest from Blog

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