Justin
Seawell

MGM Resorts International

Senior Software Engineer / Technical Lead

FullStack Labs · 2021–Present

• Launched web check-in in 3 months, integrating reservations, identity verification, and payments across 20+ properties.
• Led 4 engineers delivering web checkout in 4 months; it now handles ~40,000 weekly sessions across 21 property brands.
• Built a React analytics library adopted by 9 repositories across 4 organizations and still maintained by another team 5 years later.
• Built an in-house payment app in under 90 days, replacing a paid vendor; the payments team later reused nearly all of the code.
• Led a 6-month trip management migration to micro-frontends; shared components were adopted by another reservation platform.
• Reduced GraphQL errors affecting 2,000–3,900 weekly sessions to near zero by fixing request timing.
• Led 5 engineers building a real-time staff operations PWA, deployed to 105 devices across 4+ resorts.
• Built an Android luggage kiosk with React and Capacitor, recording 4,000+ tag submissions in its first 5 weeks.
• Mentored engineers to take ownership of code reviews and production releases across multiple apps.
• Created a GraphQL audit method and AI-assisted design-system tooling adopted by other teams.