E2E .NET Automation Tester – API & CI/CD Specialist

Numerator; Indiana (PA); On-site; USD 75,000 - 110,000; Full time

Job summary

Numerator is seeking an Automation Tester with a strong interest in the Microsoft .NET ecosystem to design, build, and maintain automated end-to-end (E2E) test suites for our backend services and APIs. The role requires strong attention to detail, solid problem-solving capability, and good software engineering fundamentals applied to test automation.

The role will expose you to API and service-level testing, behavior-driven development (BDD), cloud infrastructure, CI/CD pipelines, and owning the

Qualifications

• 3–5 years of automation testing experience.
• Strong C#/.NET skills and solid problem-solving abilities.
• Experience testing RESTful APIs and microservices.

Responsibilities

• Design, develop, and maintain automated E2E tests using C# / .NET and NUnit.
• Write behavior-driven test scenarios using SpecFlow (Gherkin) and shared test helpers.
• Build and maintain automated REST API / Web API tests with validated status codes and headers.
• Write clean, reusable test code following engineering best practices.
• Investigate test failures, perform root cause analysis, and report defects clearly and reproducibly.
• Integrate and run automated tests within CI/CD pipelines and report results.
• Collaborate with backend/frontend engineers and product managers to define acceptance criteria and test coverage.
• Improve test reliability, stability, execution time, and observability.
• Document test approaches, coverage, and engineering decisions.

Skills

C# / .NET

NUnit / xUnit / MSTest

REST API testing

CI/CD

SQL queries

Git

BDD (SpecFlow)

Test automation design

Education

Bachelor's degree in CS or related field

Tools

NUnit

SpecFlow

Job description

Numerator is seeking an Automation Tester with a strong interest in the Microsoft .NET ecosystem to design, build, and maintain automated end-to-end (E2E) test suites for our backend services and APIs. The role requires strong attention to detail, solid problem-solving capability, and good software engineering fundamentals applied to test automation.

The role will expose you to API and service-level testing, behavior-driven development (BDD), cloud infrastructure, CI/CD pipelines, and owning the