A compelling cover letter for senior software engineers showcasing production-scale performance wins, TypeScript expertise, and passion for developer tooling.
I am applying for the Senior Software Engineer position at Vercel. As a long-time user of the platform and an avid contributor to the Next.js ecosystem, the opportunity to work on the infrastructure that powers millions of developers is genuinely exciting.
In my current role at Shopify, I lead a team of four engineers building the storefront rendering layer — a system that handles 500K+ requests per minute at peak. Over the past year, I reduced cold-start latency by 42% through edge caching optimisations and rewrote our SSR pipeline to support streaming, cutting TTFB from 780ms to 190ms. I'm deeply comfortable with the performance and reliability challenges Vercel operates at.
What excites me most about Vercel is the commitment to developer experience without sacrificing performance. I'd love to contribute to making that vision even more powerful — particularly around the edge runtime and build tooling. My experience shipping production TypeScript at scale and my familiarity with the Vercel platform makes me confident I could contribute from day one.
I would welcome the chance to chat further. Thank you for your time.
Best, Marcus Webb
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