Helly Hansen migrated to Vercel and drove 80% Black Friday growth

Helly Hansen migrated its ecommerce platform to Next.js and Vercel, improving Core Web Vitals from red to green, reducing load times from over 4 seconds to 1.8–2 seconds, and achieving 80% year-over-year growth on Black Friday Cyber Monday with zero downtime.

The company also increased its A/B testing velocity from one test per month to 5–6 per sprint and saw a 21% ecommerce growth while the industry remained flat.