Principal Software Engineer

About the Company

Endgame is the context graph for every GTM agent. We process every call, deal, and playbook into structured knowledge that both humans and AI agents can act on. We've raised $47.5M from top-tier venture firms and are a team of ~25 engineers building production systems with real architecture.

Responsibilities

• Build and evolve the MCP server and agent tool surfaces that AI clients use to query Endgame's context graph
• Ship frontend features, tRPC routes, and React components for admin dashboards and core product UI
• Design and harden the public API layer, including authentication, rate limiting, and observability
• Wire new data sources into the product via the context graph
• Translate ambiguous product goals into concrete engineering scope and ship high-quality solutions
• Own end-to-end quality including performance, reliability, security, and observability

Requirements

• Deep understanding of the TypeScript and JavaScript ecosystem
• Familiarity with Python
• Experience designing and implementing LLM and agent tool surfaces
• Experience developing APIs with a focus on observability and authentication
• Strong product instincts and ability to translate requirements into engineering scope
• Deep experience with agentic coding tools and modern testing practices
• Collaborative mindset with a focus on early sharing and reversible decision-making

Preferred Qualifications

• Prior experience with revenue-data systems (Salesforce, CRMs, sales tooling)
• Experience with developer-platform infrastructure (SDKs, APIs, agent tooling)