Marcus Delray

Profile

Senior iOS Developer with 8 years building consumer and enterprise apps across fintech, health, and e-commerce verticals. Specializes in Swift, SwiftUI, and Combine-driven reactive architectures with a track record of shipping to 2M+ active users. Reduced crash rates by 41% at prior role and led a team of four engineers through a full app redesign that lifted App Store rating from 3.2 to 4.8.

Work Experience

Senior iOS DeveloperMar 2021 - Present

Luminary Financial, Austin, TX

Architected a SwiftUI-based investment dashboard consumed by 1.4M users, cutting average session load time from 3.1 s to 0.9 s through lazy rendering and background data prefetching.
Led a four-engineer squad through a zero-downtime migration from MVC to MVVM+Coordinator, reducing new-feature development cycles by 35% and eliminating 6,200 lines of legacy Objective-C.
Integrated Plaid and Stripe SDKs for real-time transaction syncing, enabling a new revenue stream that generated $2.1M in its first fiscal year.

iOS DeveloperJun 2018 - Feb 2021

CartLoop Commerce, Remote

Rebuilt the checkout flow in Swift using Combine and URLSession, reducing cart-abandonment rate by 22% and increasing mobile conversion by 18% within 90 days of launch.
Implemented Core Data caching strategy that allowed full offline browsing for 340 SKUs, earning a featured spot on the App Store 'Apps We Love' list for two consecutive quarters.
Written and maintained a suite of 480 XCTest unit and UI tests, raising code coverage from 31% to 79% and cutting QA regression cycles from 5 days to 1.5 days.

Junior iOS DeveloperAug 2016 - May 2018

Helix Health Tech, Dallas, TX

Developed HealthKit-integrated activity tracking module adopted by 210,000 users within six months of launch, contributing directly to a Series B funding round.
Optimized image-rendering pipeline using Instruments and custom caching, reducing memory footprint by 28% and resolving the app's top-rated 1-star complaint on the App Store.
Collaborated with UX team to implement dynamic type and VoiceOver support across 14 core screens, achieving WCAG 2.1 AA compliance ahead of a federal accessibility audit.

Profile

Work Experience

Education

Skills

Links