QA tester

Kryptos Technologies limited; Leeds; On-site; GBP 45,000 - 65,000; Full time

Job summary

Kryptos Technologies Limited is seeking a versatile QA / Applications Test Engineer with a strong background in testing .NET applications, web, API, and legacy enterprise software. You will design, implement and execute comprehensive manual and automated testing strategies to ensure quality, reliability, and security across our software ecosystem.

The ideal candidate will test core C#/.NET desktop or web applications and validate third-party integrations, databases, and non-.NET applications as

Qualifications

• Experience testing .NET applications (C#, .NET) across web, API and legacy enterprise software.
• Strong background building and maintaining automated test frameworks.
• Proficient in API testing (RESTful/SOAP) and data validation using SQL.
• Familiarity with CI/CD tools and DevOps pipelines.
• Experience with Jira or Azure DevOps for defect tracking.

Responsibilities

• Design, implement and execute comprehensive manual and automated test strategies for .NET applications.
• Build and extend scalable automation frameworks using Selenium, Playwright, or Cypress.
• Validate RESTful and SOAP services and ensure end-to-end data flows.
• Identify, document, and track defects in Jira or Azure DevOps and drive resolution.
• Write and run complex SQL queries for backend data validation and migrations.
• Integrate automated tests into CI/CD pipelines (Jenkins, GitHub Actions, or Azure Pipelines).

Skills

Manual testing

Automated testing

QA strategy

API testing

Security testing

Tools

Selenium

Playwright

Cypress

Postman

SoapUI

Jira

Azure DevOps

Jenkins

GitHub Actions

Job description

QA / Applications Test Engineer (.NET Specialist)

Job Description

We are looking for a versatile and meticulous QA / Applications Test Engineer with a strong background in testing .NET applications alongside web, API, and legacy enterprise software. In this role, you will design, implement, and execute comprehensive manual and automated testing strategies to ensure the highest quality, reliability, and security across our software ecosystem.

The ideal candidate will feel equally comfortable testing core C#/.NET desktop or web applications as they do validating third-party integrations, backend databases, and non-.NET auxiliary applications.

Key Responsibilities

• Test Strategy & Execution: Create, maintain, and execute comprehensive manual and automated test cases for .NET (C#, .NET, Oracle) applications as well as broader enterprise software.
• Automation Engineering: Build and extend scalable automation frameworks using tools like Selenium, Playwright, or Cypress (with C# or JavaScript/TypeScript) to reduce manual regression overhead.
• API & Integration Testing: Validate RESTful and SOAP web services using utilities like Postman or SoapUI, ensuring seamless end-to-end data flows between .NET systems and external applications.
• Defect Management: Identify, isolate, record, and track software bugs using Jira or Azure DevOps (TFS). Work closely with cross-functional development teams to ensure quick resolution.
• Database Verification: Write and run complex SQL queries to perform backend data validation, verify data integrity, and check migration workflows.
• CI/CD Integration: Integrate automated test suites into DevOps build pipelines (Jenkins, GitHub Actions, or Azure Pipelines) to facilitate continuous testing.