Marcus J. Delgado

Profile

Full-stack web developer with 8 years building high-traffic consumer and SaaS applications using React, Node.js, and PostgreSQL. Specializes in front-end performance optimization and scalable REST API design, with a track record of cutting page-load times by 40–60% across multiple production environments. Led cross-functional squads at two growth-stage startups, shipping features used by 500 000+ monthly active users.

Work Experience

Senior Web DeveloperMar 2021 - Present

Lattice Digital, Austin, TX

Rebuilt the core product dashboard in React 18 with lazy loading and code splitting, reducing initial bundle size by 54% and improving Lighthouse performance score from 61 to 94.
Designed and deployed a Node.js/Express microservices layer that handled a 3× traffic spike during a product launch without downtime, serving 1.2 M requests per day at p99 latency under 180 ms.
Mentored 4 junior developers through structured code reviews and weekly pairing sessions, cutting average PR cycle time from 6 days to 2.1 days over 6 months.

Web DeveloperJun 2018 - Feb 2021

Northbrook Commerce, Dallas, TX

Migrated a legacy jQuery storefront to a React/Redux SPA, decreasing cart-abandonment rate by 18% and contributing to a $2.3 M lift in annual online revenue.
Built a headless CMS integration with Contentful and a custom GraphQL layer, enabling the marketing team to publish new landing pages without engineering involvement and saving ~12 engineering hours per week.
Optimized PostgreSQL query plans and introduced Redis caching for product catalog endpoints, cutting average API response time from 420 ms to 68 ms.

Junior Web DeveloperAug 2016 - May 2018

Pixel Foundry, Remote

Developed 30+ responsive WordPress and custom HTML/CSS/JS client sites on deadline, maintaining a 97% on-time delivery rate across a 14-month period.
Integrated Stripe payment flows and webhook handlers for 6 e-commerce clients, processing a combined $800 K in transactions in the first year post-launch.
Reduced average image payload by 62% site-wide by implementing WebP conversion and lazy-loading pipelines, improving mobile Core Web Vitals scores for all active client properties.

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