Functional​/API Tester - St. Louis, MO

Functional/API Tester – St. Louis, MO

Capgemini is a global partner that empowers you to shape your career. Join us and help the world’s leading organizations unlock the value of technology and build a more sustainable, inclusive world.

We are seeking a highly skilled and hands‑on Senior API Tester with deep expertise in Telecom BSS/OSS systems and experience working with major telcos such as AT&T, T-Mobile, Verizon, etc. The ideal candidate will design, execute, and maintain API test strategies and automation frameworks, ensuring seamless integration and performance of telecom services.

• Design and implement comprehensive API test plans, test cases, and automation scripts.
• Perform functional, regression, performance, and security testing of RESTful and SOAP APIs.
• Conduct Telecom (Mobile Postpaid/Prepaid Service) testing with strong domain knowledge.
• Execute test design, test execution, and defect management processes.
• Assess test results, identify root causes of issues, and provide detailed reports and recommendations.
• Collaborate with cross‑functional teams to ensure quality and timely delivery.
• Communicate effectively with stakeholders and provide clear status updates.

• 6+ years of experience in API testing, with at least 3+ years in the Telecom domain.
• Strong hands‑on experience with REST/SOAP API testing tools and automation frameworks (e.g., Postman, SoapUI, JMeter, Ready
  
  API).
• Excellent analytical, communication, and problem‑solving skills.
• Solid understanding of test design techniques, defect lifecycle, and CI/CD integration.
• Preferred Qualifications:
• ISTQB or equivalent testing certification is a plus.
• Familiarity with Telecom BSS/OSS systems and integration testing.
• Experience with performance testing tools and security validation.

The base compensation range for this role in the posted location is $65,200 - $158,550.

• Paid time off based on employee grade (A-F):
  Vacation 12-25 days, company paid holidays, personal days, sick leave.
• Medical, dental, and vision coverage.
• Retirement savings plans (e.g., 401(k) in the U.S., RRSP in Canada).
• Life and disability insurance.
• Employee assistance programs.
• Other benefits as provided by local policy and eligibility.

Capgemini is an Equal Opportunity Employer encouraging inclusion in the workplace. All qualified applicants will receive consideration for employment without regard to race, national origin, gender identity/expression, age, religion, disability, sexual orientation, genetics, veteran status, marital status or any other characteristic protected by law.

: 385124

Posted on:
Dec 31, 2025