Marcus J. Delano

Profile

Senior Front-End Developer with 8 years building performant, accessible web applications for SaaS and e-commerce products. Specializes in React ecosystems, design-system architecture, and Core Web Vitals optimization. Reduced page load times by 52% at Cartwell Commerce, directly contributing to a 19% lift in checkout conversion.

Work Experience

Senior Front-End DeveloperMar 2021 - Present

Cartwell Commerce, Austin, TX

Rebuilt the product listing and checkout UI in React 18 and TypeScript, cutting Largest Contentful Paint from 4.1 s to 1.9 s and lifting checkout conversion by 19% within one quarter.
Architected a shared component library (40+ components) adopted by 6 cross-functional teams, reducing new-feature UI development time by 35%.
Mentored 3 mid-level developers through weekly code reviews and pair-programming sessions, cutting PR revision cycles from an average of 4 rounds to 1.5.

Front-End DeveloperJun 2018 - Feb 2021

Helix Digital Agency, Dallas, TX

Delivered 14 client websites on schedule across retail, healthcare, and fintech verticals, achieving an average Google Lighthouse performance score of 93.
Integrated headless CMS (Contentful) with a Next.js front end for a regional bank, reducing content-publishing time for non-technical editors by 60%.
Automated visual-regression testing with Percy and Cypress, catching 200+ UI regressions before production over 18 months.

Junior Front-End DeveloperAug 2016 - May 2018

Stackframe Labs, Remote

Built and maintained 8 marketing landing pages in Vue.js and SCSS, achieving sub-2-second load times on 3G connections per WebPageTest benchmarks.
Collaborated with 2 UX designers to implement an accessible date-picker component that passed WCAG 2.1 AA audit with zero violations.
Refactored legacy jQuery codebase to modern ES6+ modules, reducing bundle size by 41% and eliminating 3 recurring production bugs.

Profile

Work Experience

Education

Skills

Links