API Test Engineer

eNGINE; Pittsburgh (Allegheny County); On-site; USD 85,000 - 120,000; Full time

Job summary

eNGINE is seeking an API Test Engineer to design, execute, and automate testing for REST-based APIs that support mission-critical system integrations. You will focus on service-level testing to ensure APIs are reliable, secure, and production-ready.

You will write and execute test cases for positive, negative, boundary, and edge-case scenarios, and translate requirements into solid test cases across functional, negative, and integration testing.

Qualifications

• 5+ years of system testing experience
• Hands-on experience testing REST APIs
• Solid understanding of HTTP methods and status codes
• Experience with testing tools like Postman, SoapUI, JMeter, Ping API, and vREST

Responsibilities

• Write and execute test cases covering positive, negative, boundary, and edge-case scenarios
• Translate requirements into test scenarios across functional, negative, and integration testing
• Validate API behavior for HTTP methods, status codes, headers, and JSON payloads
• Test for proper error handling across a range of conditions

Skills

System testing

Test case design

REST API testing

Boundary testing

Integration testing

Tools

Postman

SoapUI

JMeter

Ping API

vREST

Job description

About eNGINE:

eNGINE builds Technical Teams. We are a Solutions and Placement firm shaped by decades of interaction with Technical professionals. Our inspiration is continuous learning and engagement with the markets we serve, the talent we represent, and the teams we build. Our Consulting Workforce is encouraged to enjoy career fulfillment in the form of challenging projects, schedule flexibility, and paid training/certifications. Successful outcomes start and finish with eNGINE.

About the role:

We're looking for an API Test Engineer to design, execute, and automate testing for REST-based APIs that support mission-critical, two-way system integrations. You'll focus on service-level testing, making sure our APIs are reliable, secure, and ready for production.

What you'll do:

• Write and execute test cases covering positive, negative, boundary, and edge-case scenarios
• Translate technical requirements into solid test scenarios across functional, negative, and integration testing
• Validate API behavior around HTTP methods, status codes, headers, and JSON request/response bodies
• Test for proper error handling across a range of conditions

What you need:

• 5+ years of system testing experience, including writing and executing test cases
• Hands-on experience testing REST APIs
• Solid understanding of HTTP methods (GET, POST, PUT, DELETE), status codes (200, 201, 400, 401, 403, 404, 500, 429), request/response headers, and JSON payloads
• Experience with Postman, SoapUI, JMeter, Ping API, and vREST

Nice to have:

Next Steps:

No C2C, relocation, referral, or sponsorship candidates for this role.