# Principal Software Engineer

**Company:** [ZoomInfo](https://hotfix.jobs/companies/zoominfo)
**Location:** Bethesda, MD, Waltham, MA
**Role:** Backend Engineering
**Salary:** $164k – $257k/yr
**Experience:** 8+ years
**Skills:** GraphQL, Node.js, TypeScript, Go, Oauth 2.0, Jwt, RBAC, Jenkins, Argo CD, Datadog, BigQuery, Solr, Bigtable
**Posted:** 2026-05-21

> Principal Software Engineer leading design and development of ZoomInfo's customer-facing GraphQL API platform on top of GTM data assets. Technical anchor setting architectural direction for scalable, secure APIs used by enterprise customers and partners.

## Job Description

## 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.

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