Senior Front-End Platform Engineer

Jonathan Concepcion

Web and Application Front-end Engineer

Brentwood, CA • 818-***-**** • jonathanconcepcion.com SUMMARY

Front-end engineer specializing in scalable web and mobile applications with 18+ years of experience delivering UI platforms across AI, fintech, cybersecurity, and enterprise SaaS. Experienced in defining technical direction, modernizing legacy systems, and improving engineering efficiency, performance, and reliability through thoughtful architecture and cross-functional collaboration.

Deep expertise in React, Next.js, Angular, TypeScript, Tailwind CSS, Ionic, and Capacitor, with a strong focus on performance optimization and front-end platform design. CORE STRENGTHS

Front-end Components • Platform Engineering • Design Docs • Cross-Team Influence React / Next.js • Angular • TypeScript • SSR / SSG • Hybrid Apps (Ionic Capacitor/React Native) Performance Optimization • Web Components • Design Systems CI/CD • E2E Automation • Developer Productivity

EXPERIENCE

Staff Front-end Developer

Xfactor Remote

January 2023 – January 2026

● Drove front-end development for an AI-driven revenue analytics platform, building and maintaining core UI systems.

● Designed and implemented modular React/Next.js and React Native applications to support complex, data-intensive dashboards.

● Improved load performance by 35% using SSR, dynamic imports, and structured performance budgets.

● Authored detailed technical design documents and contributed reusable patterns adopted across front-end teams.

● Collaborated closely with product and data teams to translate evolving requirements into performant, maintainable implementations.

Senior Front-end Engineer

Bishop Fox Remote

June 2021 – January 2023

● Improved components and modularity of enterprise cybersecurity platform

(React/TypeScript).

● Reduced technical debt and increased maintainability through structured refactoring.

● Enhanced reliability and observability for enterprise-facing applications. Senior Front-end Developer

TrustArc San Francisco, CA

June 2017 – June 2021

● Led framework-agnostic web component platform (30+ reusable components) adopted across multiple product teams; reduced UI duplication by ~40%.

● Built internal UI starter framework cutting new project setup time by 60%.

● Standardized front-end design pattern across Angular, and Vanilla JS ecosystems.

● Implemented CI/CD + automated testing pipelines, increasing deployment frequency 2–3x.

● Led distributed team across multiple countries; conducted design and code reviews and mentored engineers.

Senior Front-end Developer

Prudential Financial Mountain View, CA

April 2016 – June 2017

● Led Angular modernization initiative for enterprise financial applications.

● Built internal framework abstractions and optimized Webpack-based build system.

● Implemented blue/green deployments to reduce production risk. Senior Front-end Developer

E*TRADE Menlo Park, CA

August 2011 – August 2015

● Helped global front-end standardization across high-traffic trading platforms.

● Developed reusable JS/CSS libraries adopted org-wide.

● Delivered revenue-critical financial tools including trading dashboards and retirement platforms.

TECHNICAL DEPTH

React • Next.js • Angular • TypeScript • JavaScript • TailwindCSS • Ionic • Capacitor • Hybrid Web Components • Design Systems • Performance Engineering CI/CD • TDD • Cypress • Playwright

Monorepo Architecture • Webpack • REST APIs

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