# Senior Software Engineer - API & MCP Platform

**Company:** [ZoomInfo](https://hotfix.jobs/companies/zoominfo)
**Location:** Bethesda, MD, Waltham, MA
**Role:** Backend Engineering
**Salary:** $140k – $200k/yr
**Experience:** 5+ years
**Skills:** Java, Nestjs, Spring Boot, Spring Security, Maven, Gradle, Oauth 2.0, Openid Connect, Jwt, REST APIs, Api Gateway, Openapi, Swagger, Docker, Kubernetes
**Posted:** 2026-06-04

> Senior Software Engineer building and scaling ZoomInfo's API infrastructure with Java and NestJS. Focus on RESTful APIs, OAuth 2.0 security, MCP tools for AI integrations, and high-performance API gateways handling millions of calls.

## Job Description

## 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

## Compensation & Benefits

- 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
- Comprehensive benefits and holistic mind, body and lifestyle programs designed for overall well-being

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**Apply:** https://hotfix.jobs/jobs/221d22d5-db76-42ee-8869-7cafddbec859
**Canonical:** https://hotfix.jobs/jobs/221d22d5-db76-42ee-8869-7cafddbec859