The 150-year-old Norwegian brand leveraged Next.js and Vercel to achieve 30%+ conversion lift while competing against industry titans Founded in 1877, Helly Hansen is a global leader in technical apparel, but its digital experience wasn't living up to its legacy. Operating across 38 global markets with multiple brands (including HellyHansen.com , HHWorkwear.com , and Musto.com ), the company was being held back by an outdated tech stack that slowed site speeds and frustrated customers. Through an incremental migration to Next.js and Vercel, Helly Hansen improved Core Web Vitals from red to green, increased developer agility, and delivered a record-breaking Black Friday Cyber Monday, building a foundation for future innovation. Helly Hansen saw 80% year-over-year growth on Black Friday Cyber Monday with zero downtime after migrating to Next.js and Vercel. Link to heading Core performance issues destroying customer experience Helly Hansen's performance issues stemmed from its architecture.…