Senior Product Engineer London Hybrid Startup 90,000 - 130,000 + meaningful equity Tech stack:Experience required across any of the following:GolangRustTypeScript, Node.jsReact.js, Next.js AWS or GCP Most B2B SaaS products are effectively dashboards on top of a database. This isn''t that. We''re working with an Agentic AI startup building infrastructure and intelligent software systems that sit underneath large scale operational workflows and real time decision making processes. The platform processes very high volumes of live data, powers complex orchestration pipelines, and delivers AI driven functionality directly into customer environments at enterprise scale. The engineering challenges are genuinely difficult. Not "we use Kubernetes so we''re scaling" difficult. More the kind of problems involving distributed systems, real time data ingestion, AI orchestration pipelines, and building software that customers rely on day to day inside production environments. The team is still small enough that every engineer materially changes the trajectory of the business. No giant hierarchy, no endless roadmap theatre, no Jira archaeology expedition trying to work out why a ticket exists. That means speaking to customers, understanding commercial context, shaping product direction, building systems, shipping to production, monitoring outcomes, and iterating quickly. You''ll be working across:Real time event streaming systems handling very high traffic volumesAI powered workflows and or