Team Lead Backend Engineer (Core Applications)

Your Mission

Your mission is to architect and scale our core API infrastructure that powers mission-critical workflows for Marketing, Sales, and Customer Success teams. You’ll lead the engineering behind the services that serve 60+ TB of GTM data, delivering low-latency, high-availability APIs that expose deep buyer insights to our internal apps and customer-facing dashboards.

What You’ll Do

• Lead the design and development of APIs that expose GTM data to internal and external users.
• Own end-to-end architecture for large-scale data access patterns, optimizing for performance, cost, and reliability.
• Collaborate closely with AI, data, and frontend teams to ensure seamless integrations and clean API contracts.
• Tackle complex problems like versioning, rate-limiting, auth, query complexity, and cache invalidation across a fast-evolving product surface.
• Build internal tooling to improve engineering velocity and observability for our backend systems.
• Drive engineering best practices, code quality, and testing in a fast-paced, high-output environment.
• Mentor engineers and set the technical direction for the team.

What We’re Looking For

• Ownership-first mindset — you take initiative, move fast, and figure things out
• Thrives in early-stage, high-urgency environments where speed and impact matter
• Committed to working in-person 5 days/week at our SF HQ
• Curious, self-aware, and feedback-driven — you bring energy, not ego
• See this role as a defining chapter — not a stepping stone or side quest
• 5+ years of backend engineering experience, ideally with exposure to high-scale systems
• Strong understanding of API design principles, query optimization, and distributed systems
• Experience with large-scale data systems (think TBs of data) and know how to manage performance, cost, and uptime at scale
• Startup mindset – you move fast, figure things out, and don’t wait to be told what to do
• Comfortable owning ambiguity – you define the problem, architect the solution, and ship the result.

Why Join Now?

• We’re at an inflection point. The product is proven, the market is massive, and the opportunity is wide open.
• You’ll be joining a company with real traction, rapid growth, and meaningful backing—where every person still shapes the outcome.
• This isn’t just a job. It’s a chance to build something category-defining with people who care deeply about doing it right.

The salary range for this role is $200,000– $240,000 USD base pay annually, depending on experience and qualifications.