Backend API Automation Tester

October 18, 2026

Hybrid

Senior

Copenhagen

Description

Backend API Automation Tester is needed for an e-commerce platform and underlying services, ensuring functionality, performance and reliability. The role focuses on building robust automation frameworks for backend services and APIs. The specialist works closely with developers, QA and DevOps teams and is located in Copenhagen, Denmark.

Responsibilities

Design, develop, and maintain automated test frameworks specifically for backend services and APIs
Create and execute sophisticated API tests using Playwright
Automate complex authentication flows, including OAuth, JWT, and API keys, for secure service-to-service communication
Validate RESTful (and SOAP) APIs for functionality, performance, and schema integrity (JSON/XML)
Implement and manage automated test suites within CI/CD pipelines (e.g., Jenkins, GitHub Actions)
Analyze test results, identify root causes of defects, and collaborate with developers to ensure timely resolutions
Develop comprehensive test cases, test plans, and data strategies for backend systems with clear API documentation
Conduct regression, smoke and integration testing to support frequent production releases

Requirements

5-7 years of experience in backend/API testing with deep hands-on experience in Playwright
Proficiency in automation scripting using JavaScript or TypeScript
Solid understanding of REST APIs, HTTP methods, headers, status codes and version control (Git)
Familiarity with Agile/Scrum methodologies, Jira and modern test management tools like XRAY, HP ALM, Practi Test
Proactive approach to identifying bottlenecks and optimizing automation frameworks for speed and reliability
Strong communication skills to bridge the gap between technical backend requirements and business needs
Ability to work within diverse teams and foster a positive, solutions-oriented environment
Nice to have: experience with performance testing tools such as JMeter or K6
Nice to have: ISTQB Foundation Certification
Nice to have: experience with e-commerce platform architectures

Conditions

Hybrid working, flex time and work/life balance
29 days of holiday plus senior and flex days
Competitive remuneration including short term incentive bonus on all levels
Health insurance and in-house canteen with many healthy options
Personalized development plans and internal mobility opportunities locally and globally
Permanent full-time contract located in Copenhagen

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