Principal Software Engineer

What You'll Do

• Architect, design, and own the end-to-end development of ZoomInfo's customer-facing GraphQL APIs, ensuring high availability, low latency, and developer-friendly experiences.
• Define schema design standards, versioning, deprecation, and backward-compatible evolution across product surfaces.
• Work with product managers and data engineers to expose ZoomInfo's GTM data assets (BigTable, BigQuery, Solr) through well-structured, queryable API surfaces.
• Implement and enforce API security, OAuth 2.0, JWT, RBAC, rate limiting, and query complexity controls.
• Maintain production reliability through CI/CD pipelines (Jenkins, ArgoCD) and observability practices using Datadog.
• Use AI tooling (Claude, GitHub Copilot) as part of your daily workflow and help the team do the same responsibly.
• Lead code and design reviews, mentor senior engineers, and contribute to the engineering roadmap.

What You Bring

• Deep GraphQL expertise: schema design, resolvers, federation, subscriptions, and performance optimization. Experience with GraphQL Yoga or Apollo Server (transferable skills).
• Strong Node.js and TypeScript skills for API services and developer tooling; Go experience for backend and infrastructure work.
• Experience securing customer-facing APIs, OAuth 2.0, JWT, fine-grained authorization, rate limiting.
• Familiarity with large-scale data systems; exposure to BigTable, BigQuery, or Solr is a plus.
• Experience building developer-facing SDKs or API tooling. You think about the API consumer, not just the implementation.
• Familiarity with AI coding tools (Claude, GitHub Copilot); experience with AI Agents or MCP tooling is a bonus.
• Clear communicator who can drive technical decisions and bring along both engineering and non-engineering stakeholders.

Ideal Background

• 8+ years of software engineering experience, with a focus on production-grade, customer-facing APIs at scale.
• Prior experience owning a developer-facing API platform at a SaaS or data company.
• Bachelor's or advanced degree in Computer Science, Engineering, or a related field.