Senior Engineer - Growth Marketing

Headquarters: United States, California URL: https://buffer.com/ About the role We're looking for a Senior Frontend Engineer to join our Growth Marketing team. This is a hands-on engineering role building the web experiences and systems that help Buffer grow. The work spans building features and pages across buffer.com - interactive tools, benchmarks, referral systems, conversion flows - along with the technical implementation behind them: integrations with marketing tools, analytics and tracking systems, SEO implementations, and backend logic that powers our marketing features. We need someone who's comfortable across the full frontend scope - strong with React and modern web development, but also capable of diving into backend logic, connecting third-party APIs, debugging tracking pipelines, and figuring out what they don't know. You'll collaborate closely with Simon (Director of Marketing), David (Senior Design Engineer), and Kate (Senior Designer). The team values pace and iteration — we ship quickly, learn from real usage, and improve as we go. But we also care about craft — noticing the UX details and maintaining standards while keeping momentum. What you’ll do Lead growth engineering projects, like implementing a localization framework to support international audiences, building referral program logic and attribution systems, rebuilding our tracking implementation to improve accuracy and reliability. You’ll own projects from concept to launch, working closely with marketing, design, and other engineers. Build features on Buffer's marketing site — ship landing pages, interactive tools, and conversion flows that help people discover and try Buffer. Create benchmarks, calculators, and utility content that educate users and drive engagement. Shape marketing platform capabilities by building systems and frameworks that let the team move faster. Create A/B testing infrastructure, develop programmatic page generation for SEO/AEO, implement content management patter