Senior Software Engineer - API & MCP Platform

ZoomInfo is where careers accelerate. We move fast, think boldly, and empower you to do the best work of your life. You’ll be surrounded by teammates who care deeply, challenge each other, and celebrate wins. With tools that amplify your impact and a culture that backs your ambition, you won’t just contribute. You’ll make things happen–fast.

ZoomInfo is where careers accelerate. We move fast, think boldly, and empower you to do the best work of your life. You'll be surrounded by teammates who care deeply, challenge each other, and celebrate wins. With tools that amplify your impact and a culture that backs your ambition, you won't just contribute. You'll make things happen–fast.

As a Senior Software Engineer on the API & MCP Platform team, you'll be at the forefront of building and scaling ZoomInfo's API infrastructure that handles millions of API calls weekly and powers integrations across our platform. You'll work with Java and NestJS to develop robust, secure, and high-performance API services that enable seamless connectivity for our customers and partners.

You'll design and implement scalable API architectures, establish best practices for API security and authentication, and build infrastructure that enables partners and customers to leverage ZoomInfo's data at scale. Your expertise in API design, OAuth 2.0, and emerging technologies like Model Context Protocol (MCP) will be essential in creating world-class developer experiences.

Our engineering culture values diversity, intellectual curiosity, problem-solving, and openness. We encourage collaboration, big thinking, and calculated risk-taking in a blame-free environment. You'll have the autonomy to work on meaningful projects while receiving the support and mentorship needed to grow your career.

What You'll Do:

Design, develop, and maintain scalable RESTful APIs using Java and NestJS framework

Build APIs that power company and contact data enrichment, search, and intelligence capabilities

Architect and implement secure authentication and authorization systems using OAuth 2.0

Build high-performance API gateways with advanced rate limiting, throttling, and quota management

Design and implement MCP (Model Context Protocol) tools and servers to enable AI-powered integrations

Establish and enforce API design standards, versioning strategies, and best practices across the organization

Optimize API performance, caching strategies, and response times for high-volume traffic (millions of calls daily)

Design and implement comprehensive API documentation, SDKs, and developer tools

Create MCP tool schemas, implement prompt best practices, and optimize tool discovery patterns

Collaborate with product and integration teams to define API contracts and service-level agreements (SLAs)

Implement monitoring, logging, and analytics for API usage patterns and performance metrics

Participate in code reviews and mentor team members on API and MCP best practices

Troubleshoot and resolve production issues in distributed API systems

Contribute to technical architecture decisions for API platform evolution

What You Bring:

Bachelor's degree in Computer Science, a related field, or equivalent practical experience

5+ years of experience in software development with strong focus on API development

3+ years of experience designing and implementing RESTful APIs and microservices at scale

Strong expertise in Java frameworks (Spring Boot, Spring Security, Maven/Gradle)

Strong expertise in NestJS framework

Deep understanding of OAuth 2.0, OpenID Connect, JWT, and API security best practices

Experience with API gateway technologies

Proficiency with API design patterns, versioning, and documentation (OpenAPI/Swagger)

Strong knowledge of rate limiting, throttling, and API scalability strategies

Understanding of distributed systems and high-availability architectures

Experience with MCP (Model Context Protocol) tool creation and implementation

Preferred Qualifications:

Experience releasing production MCP tools and servers

Deep knowledge of MCP best practices, prompt engineering, and tool design patterns

Familiarity with AI/LLM integration patterns and context management

Experience with cloud platforms (AWS, GCP, or Azure)

Knowledge of containerization and orchestration (Docker, Kubernetes)

Experience with CI/CD pipelines and automated API testing

Familiarity with message queuing systems (Kafka, RabbitMQ)

Experience building developer portals and API documentation platforms

Background in platform engineering or developer experience (DX) initiatives

Active contributions to open-source API projects or MCP tool repositories

The US base salary range for this position is $140,000 - $200,000 + variable compensation + benefits.

Actual compensation offered will be based on factors such as the candidate’s work location, qualifications, skills, experience and/or training. Your recruiter can share more information about the specific salary range for your desired work location during the hiring process.

We want our employees and their families to thrive. In addition to comprehensive benefits we offer holistic mind, body and lifestyle programs designed for overall well-being. Learn more about ZoomInfo benefits here.

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About us:

ZoomInfo (NASDAQ: GTM) is the Go-To-Market Intelligence Platform that empowers businesses to grow faster with AI-ready insights, trusted data, and advanced automation. Its solutions provide more than 35,000 companies worldwide with a complete view of their customers, making every seller their best seller.

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For Massachusetts Applicants: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability. ZoomInfo does not administer lie detector tests to applicants in any location.