Automation Tester (C# .Net)

Role Overview

We are looking for 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 quality and reliability of software across distributed systems at scale.

Key Responsibilities

• Design, develop, and maintain automated E2E tests using C# / .NET and NUnit

• Write behavior-driven test scenarios using Reqnroll / SpecFlow (Gherkin) and shared test helpers

• Build and maintain automated REST API / Web API tests, validating status codes, payloads, and security headers

• Write clean, maintainable, and reusable test code following engineering best practices

• Investigate test failures, perform root cause analysis, and raise clear, reproducible defect reports

• Integrate and run automated tests within CI/CD pipelines and report on results

• Collaborate with backend engineers, frontend engineers, and product managers to define acceptance criteria and test coverage

• Improve test reliability, stability, execution time, and reporting/observability

• Document test approaches, coverage, and engineering decisions

• Experience: 3 to 5 years

• Experience with C# / .NET

• Understanding of automated testing principles and the testing pyramid (unit, integration, E2E)

• Familiarity with a unit/test framework such as NUnit, xUnit, or MSTest

• Solid understanding of REST principles and how to test Web APIs

• Good problem-solving and debugging skills

• Understanding of software engineering fundamentals and clean code practices

• Experience working with relational databases and writing SQL queries to set up and verify test data

• Experience with Git and modern development workflows

• Strong communication and collaboration skills

Good to Have

• Experience with BDD frameworks (Reqnroll / SpecFlow / Cucumber) and Gherkin

• Experience with API testing tools (Postman, REST clients, or code-based HTTP clients)

• Experience with test reporting tools (e.g. ExtentReports)

• Experience with Microsoft Azure

• Knowledge of CI/CD tooling and DevOps practices

• Experience testing microservices-based architectures

• Exposure to UI automation (Selenium, Appium, Playwright, or Cypress)

Preferred Experience

• Experience working in agile delivery teams 

• Exposure to cloud-native application development 

Our Technology Stack

• .NET / C# 

• Angular

• REST APIs / Web APIs 

• SQL Server 

• Azure 

• Terraform 

• Azure DevOps 

If you have strong problem-solving skills, a keen eye for quality, and a solid grasp of object-oriented programming concepts, we encourage you to apply even if you do not have experience with one or more of the technologies. We are looking for people who have strong software engineering fundamentals and the ability to learn.

There is strength in numbers - We are the Numerati

Numerator is 5,800 employees strong. We have the confidence to be real and embrace what makes each Numerati unique. Our diverse experiences, ideas and backgrounds fuel our innovation.

Being part of the Numerati means that we’ll take care of you! From our Recharge Days, maximum flexibility policy, wellness resources for employees and their families, development opportunities and much more — we’re always finding ways to better support, celebrate and accelerate our team.