Marcus J. Delgado

Profile

Senior JavaScript developer with 8 years building high-traffic web applications across fintech and SaaS domains. Specializes in React, Node.js, and TypeScript, with a track record of reducing load times by 40–60% and shipping features that directly lifted user retention. Comfortable leading small engineering teams and owning architecture decisions from prototype to production.

Work Experience

Senior JavaScript DeveloperMar 2021 - Present

Vantara Financial, Austin, TX

Rebuilt the client dashboard in React 18 and TypeScript, cutting average page load time from 4.2 s to 1.6 s and reducing support tickets related to UI lag by 38%.
Architected a Node.js microservices layer that replaced a monolithic REST API, enabling the team to deploy 3× more frequently with zero unplanned downtime over 14 months.
Mentored 4 junior developers through weekly code reviews and a structured onboarding curriculum, reducing their ramp-up time from 10 weeks to 6 weeks.

JavaScript DeveloperJun 2018 - Feb 2021

Loopcraft Studios, Remote

Developed a real-time collaboration feature using WebSockets and Redux that became the product's #1 cited reason for upgrade in a 2020 customer survey (n = 1,200).
Optimized Webpack build pipeline, slashing production bundle size by 52% and shaving 90 seconds off CI/CD run times across 6 active projects.
Integrated Stripe and Plaid APIs to launch a subscription billing module that processed $2.4 M in transactions within its first 6 months.

Front-End DeveloperAug 2016 - May 2018

Brightline Agency, Dallas, TX

Delivered 14 client websites using vanilla JavaScript, SCSS, and WordPress REST API, consistently meeting deadlines within a 2-week sprint cycle.
Introduced ESLint and Prettier to the team workflow, reducing code-review comments related to style issues by 65% within one quarter.
Built an interactive data-visualization dashboard for a healthcare client using D3.js, replacing a static PDF report and saving the client an estimated 20 staff-hours per month.

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