# Justin M. > Staff Software Engineer | Frontend Architecture | CI/CD Expert | Design Systems | Performance Optimization | Technical Leadership | Ex Guild and Ex Affirm Location: Denver, Colorado, United States Profile: https://flows.cv/justinm Experienced Staff Software Engineer with a track record of successfully delivering high-impact technical projects. I take a data-driven approach to engineering decisions to help drive efficiency, performance, and cost savings. I consistently create tools and systems that enhance productivity across teams and have experience delivering on large scale products which require technical and product collaboration between teams. Languages/Frameworks: Typescript, React, Express, CI/CD, AWS ## Work Experience ### Staff Software Engineer @ Affirm Jan 2022 – Jan 2024 | Denver, Colorado, United States - Led CI/CD infrastructure migration from AWS to Buildkite across all web deployments, achieving 70% faster build and deploy times while reducing infrastructure costs and improving developer experience during deployment. - Spearheaded comprehensive design system evolution by architecting a flexible theming framework that enabled simultaneous support for legacy and new brand identities, enabling a zero-disruption rebrand launch. - Introduced UI testing methodologies within Storybook that significantly increased component reliability and visual consistency across applications while reducing regression bugs by identifying issues before production. - Led end-to-end delivery of strategic B2B product launch, designing and implementing both frontend and backend architectures while orchestrating cross-functional integration with internal systems and stakeholders. - Created performance instrumentation systems with Datadog to both justify the efforts of migration and to provide visibility into deployment pipeline bottlenecks and overall health. ### Senior Software Engineer @ Affirm Jan 2020 – Jan 2022 | Denver, Colorado, United States ### Staff Software Engineer @ Guild Education Jan 2020 – Jan 2020 | Greater Denver Area - Designed and implemented an atomic CSS framework to promote more consistent styling and reduced new CSS code by 80% across all product teams. - Created data visualization dashboard for Design System metrics that provides component usage insights and informed component update decisions. - Led CI/CD infrastructure migration from Heroku to AWS for all single-page applications as part of a company wide effort to consolidate infrastructure usage to AWS and to solve some page routing challenges we had because of how our SPAs were developed and deployed. - Served as a mentor for junior UI engineers across product teams ### Lead Software Engineer @ Guild Education Jan 2018 – Jan 2020 | Denver, Colorado, United States ### Frontend Engineer @ OmniSci Jan 2018 – Jan 2018 | San Francisco, California Engineer on the UI visualization team working to support and create high-performance visual chart components for our GPU-backed query engine. ### Software Engineer @ LogRhythm Jan 2016 – Jan 2018 | Boulder, Colorado - Helped engineer high-performance virtualized React data tables capable of rendering hundreds of thousands of log data rows. - Part of a two person team to develop an Electron-based configuration management tool that streamlined customer onboarding process for Logrhythm’s on premise distributed system deployments. - Worked with my team lead to overhaul our automated testing strategy by utilizing data-attribute selectors instead of brittle CSS/ID selectors to improve the reliability of our e2e testing and integration test suites. - Generally worked to add new features to our web UI dashboard responsible for interacting with and handling thousands of client-side logs ### Software Engineer @ ShipCompliant Jan 2016 – Jan 2016 | Boulder, CO - Built greenfield React/Redux frontend with C#/.NET backend as part of a new product launch to help small businesses handle sales tax details of selling online products. - Developed and maintained a comprehensive frontend style guide documenting React and SCSS best practices, significantly improving code quality and developer onboarding. - Served on the technical steering committee to evaluate and select between react and angular for a company-wide frontend framework ### Graduate Student Researcher @ UC Irvine Jan 2012 – Jan 2015 | University of California, Irvine - Spearheaded the NSF research project by creating new drilling techniques for Silicon Nitride Nanopores and designing fluid cells in AUTOCAD - Developed numerical COMSOL simulations for the nanoscale electrochemistry of the pores and wrote python scripts using NumPy for data analysis - Discovered novel mechanism for how particles can modulate ionic concentration at pore entrances int low ionic concentrations - Published in The Journal of Physical Chemistry C ### Graduate Teaching Assistant @ UC Irvine Jan 2012 – Jan 2014 | Irvine, CA -Taught review sessions for undergraduate physics ranging from Classical Mechanics to Electricity and Magnetism -Led undergraduate labs where I helped design experiments to reinforce student understand of basic physical concepts ### Undergraduate Researcher @ Vanderbilt University Jan 2011 – Jan 2011 - Original research on Big Bang Nucleosynthesis won the Goldwater Scholarship at a national level - Wrote FORTRAN simulations to simulate element abundances of BBN as a function of neturino numbers - Published in Physical Review D ## Education ### Bachelor of Arts (B.A.) in Physics Vanderbilt University Jan 2008 – Jan 2012 ### Master of Science (M.S.) in Physics UC Irvine Jan 2012 – Jan 2015 ### Full Stack Web Development App Academy Jan 2015 – Jan 2015 ## Contact & Social - LinkedIn: https://linkedin.com/in/justinmenestrina - Website: http://jmenestr.github.io - GitHub: http://www.github.com/jmenestr --- Source: https://flows.cv/justinm JSON Resume: https://flows.cv/justinm/resume.json Last updated: 2026-03-22