Principal Software Engineer

ZoomInfo is where careers accelerate, and they are seeking an experienced Principal Software Engineer to lead the design and development of their customer-facing GraphQL API platform. This high-impact individual contributor leadership role involves setting architectural direction and ensuring the platform's quality, scalability, and customer success.

Responsibilities:

• 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

Requirements:

• Deep GraphQL expertise: schema design, resolvers, federation, subscriptions, and performance optimization
• 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
• Clear communicator who can drive technical decisions and bring along both engineering and non-engineering stakeholders
• 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
• Experience with GraphQL Yoga or Apollo Server (transferable skills)
• Exposure to BigTable, BigQuery, or Solr is a plus
• Experience building developer-facing SDKs or API tooling
• Familiarity with AI coding tools (Claude, GitHub Copilot)
• Experience with AI Agents or MCP tooling is a bonus