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Resume

by Jesus Montes - 4 min read

Lead Software Engineer / Senior Software Engineer

Mexico / Remote

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Senior / Lead Software Engineer with 10+ years of experience building web products in fintech, business intelligence, and education. Experienced in technical leadership on small teams, frontend architecture, and end-to-end delivery of scalable systems.

Strong track record of clarifying ambiguous requirements, making pragmatic technical decisions, and improving performance, reliability, and developer workflows through testing and observability. Comfortable working across frontend and backend boundaries in cloud and microservice-based environments, with a focus on product impact and maintainability.

Core Skills

Frontend Engineering: JavaScript, TypeScript, React, Angular, Nx, Micro Frontends, React Query, Redux Toolkit, RxJS, NgRx, Storybook, Vite, Immer, Webpack, Framer Motion, SCSS, LESS.

Backend & Data: Node.js, Express, PHP, PostgreSQL, MongoDB, Redis, Memcached, RabbitMQ.

Testing: Playwright, Jest, Cypress, Vitest, Testing Library, Visual Regression, End-To-End testing.

Architecture & Delivery: Frontend Architecture, Performance Optimization, Monorepos, Clean Architecture, CI/CD, Observability, Accessibility (WCAG AA).

Cloud & Dev Tools: Datadog, Jenkins, Docker, AWS, Git.

Leadership: Technical leadership, Mentoring, Knowledge Transfer, Cross-Team Collaboration.

Additional Exposure: Python, Golang.

Recent Professional Experience

PayPal

Senior Software Engineer

Mexico City, MX | Feb 2023 - Feb 2026

  • Scaled and evolved a shared web platform serving 250M+ monthly visitors, helping define architecture, reusable patterns, and cross-browser standards for a highly customizable component library.
  • Improved web performance on high-traffic pages, reducing LCP by 33% and increasing the share of users with good load times of 2.5s or less from 60% to 80%.
  • Built and integrated a visual regression and functional testing pipeline with Playwright, Jenkins, and Docker, reducing release validation time and increasing confidence in frontend releases.
  • Developed custom Datadog dashboards to track Core Web Vitals, error rates, and user segments, enabling data-driven prioritization of performance and reliability improvements.
  • Partnered with the accessibility team to conduct audits and implement improvements aligned with WCAG AA standards.
  • Co-designed and documented foundational design system components as part of a cross-team performance initiative, improving reuse, consistency, and maintainability.

GBM

Senior Frontend Engineer / Lead Frontend Engineer

Mexico City, MX | Mar 2019 - Feb 2023

  • Led frontend architecture modernization through clean architecture, micro frontends, monorepo adoption, code quality standards, test automation, and living documentation.
  • Improved performance of the company's most-used web application, serving 1.5M+ active users, reducing load time from 30s to 6s.
  • Reduced the main application's observed error rate from 85% to 2% in production monitoring.
  • Provided technical leadership for a team of 5 engineers building a new React-based application from scratch for Financial Advisors to manage accounts and execute stock market operations, guiding architecture, delivery, and engineering standards.
  • Co-developed the company's reference web application and formalized frontend standards, improving onboarding, consistency, and cross-team alignment.
  • Led frontend release and monitoring workflows in AWS, contributing hands-on changes across services such as CloudFront, S3, CodePipeline, CloudWatch, Amplify, Lambda, and API Gateway.

DA.SH by Virket Holding

Lead Software Engineer

Mexico City, MX | Jan 2017 - Mar 2019

  • Led the rewrite of the company's main BI product, building customizable chart widgets and data connectors for diverse sources, including transformation and normalization workflows that improved integration with downstream data systems.
  • Co-designed and implemented a custom SQL-like query language and a web interface inspired by the IPython Notebook for executing queries, expanding the product's analytical flexibility.
  • Designed and implemented the architecture for a non-blocking analytics library (Dashalytics.js), improving responsiveness and enabling analytics collection without degrading user experience.
  • Contributed to deployment and operational workflows for production applications in AWS, working with services including EC2, Lambda, S3, RDS, and CodePipeline.

DA.SH by Virket Holding

Full Stack Developer

Mexico City, MX | Jun 2015 - Jan 2017

  • Developed a hybrid mobile application for selling products for an MLM company.
  • Drove adoption of TypeScript in large Node.js projects, improving maintainability and type safety.
  • Led migration from imperative patterns to a reactive application architecture using RxJS and NgRx.
  • Helped with the development of a custom chart library using d3 (MDCharts.js).
  • Implemented CI/CD pipelines for hybrid mobile applications, improving delivery consistency.

Education

Instituto Tecnologico de Tuxtla Gutierrez

Bachelor's Degree in Computer Science

Tuxtla Gutierrez, Chiapas, MX | Aug 2007 - Dec 2011

Languages

English: Full Professional Proficiency

Spanish: Native