API Tester-Karate

Automation Engineer (API)

Hybrid - Minneapolis, MN or Milwaukee, WI or Denver, CO

12 months contract +

Position Overview

Client is seeking a Senior API Automation Engineer to lead the development and maintenance of scalable, high-quality API test suites across our digital platforms. This role will focus on contract testing, security validation, and backend integration for Embedded Finance APIs, internal services, and mainframe systems. The ideal candidate will possess deep technical expertise, strong collaboration skills, and a passion for quality engineering.

Key Responsibilities

• Design, develop, and maintain automated API test suites using Karate, RESTinstance, and RestAssured
• Lead efforts in contract testing, security validation, and integration testing across service layers
• Validate backend processes and business rules for systems such as SOR, Domains, and Read Store using SSHLibrary and CLI wrappers (Python/Java)
• Collaborate with developers, architects, and QA leads to ensure testable service contracts and early defect detection
• Integrate API automation into CI/CD pipelines (Jenkins, GitHub Actions, Azure DevOps) and ensure test reliability
• Mentor junior and mid-level engineers, contribute to reusable test libraries, and promote best practices
• Participate in sprint ceremonies, quality governance reviews, and continuous improvement initiatives

Required Experience

• 5 7 years of experience in test automation, with a strong focus on API and backend testing
• Proven expertise in API contract testing, service mocking, and backend data validation
• Hands-on experience with Karate (preferred), RESTinstance, and RestAssured
• Familiarity with mainframe systems and secure CLI-based validation is a plus
• Experience working in Agile/Scrum environments with cross-functional teams
• Financial services or regulated industry experience preferred