Senior Frontend Engineer, Growth

Synthesia Synthesia · Multimodal · London, United Kingdom · Engineering

Senior Frontend Engineer, Growth role at Synthesia, an AI video platform. The role focuses on owning and shipping high-impact experiments and features end-to-end to move activation, conversion, and revenue metrics. Responsibilities include working full-stack across growth surfaces, building and extending the team's experimentation platform, and partnering with product managers and data analysts. The ideal candidate has experience in activation, conversion, monetization, or PLG systems, and experience building or extending experimentation infrastructure.

What you'd actually do

  1. Own and ship high-impact experiments and features end-to-end - from hypothesis to production - that directly move activation, conversion, and revenue metrics.
  2. Work full-stack across the Growth surface: activation flows and onboarding, self-serve and freemium infrastructure, pricing and packaging mechanics, PQL-to-enterprise funnels, viral and sharing loops.
  3. Build and extend the team's experimentation platform.
  4. Partner closely with product managers and data analysts to prioritize the highest-leverage work, make clear trade-offs between experimentation velocity and long-term scalability, and translate ambiguous business problems into clean technical solutions.

Skills

Required

  • Experience in activation, conversion, monetization, or PLG systems
  • Experience building or significantly extending experimentation infrastructure
  • Strong product sense and ownership mindset

Nice to have

  • Experience with viral mechanics, sharing loops, or team-expansion features

What the JD emphasized

  • Experience building or significantly extending experimentation infrastructure
  • builder bar, not just the user bar