Senior Software Development Engineer in Test (SDET)
Confidential
Posted: February 23, 2026
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Quick Summary
We are seeking a Software Development Engineer in Test (SDET) to join our team in Istanbul, Turkey, to develop a state-of-the-art shipping platform. The ideal candidate will have experience with SDET testing and experience with a similar platform. The company is looking for a highly skilled engineer to join our team in Istanbul, Turkey.
Required Skills
Job Description
Senior Software Development Engineer in Test (SDET)
About the job
We are building a world-class team at Mercury Teknoloji A.Ş. in Turkey (with offices in Izmir and Istanbul), a wholly-owned subsidiary of Mercury Business Services headquartered in Boston, to develop a state-of-the-art shipping platform that provides the best user experience. Our platform will handle all time-critical and temperature-sensitive shipments as well as express package and freight shipments for life sciences and healthcare companies.
We are seeking a Software Development Engineer in Test (SDET) that is mission-critical to designing and implementing robust test automation frameworks to ensure high-quality, scalable, and reliable products, while also coaching the team in quality and testability. You will play a key role in shaping our automation strategy and elevating the overall quality mindset across the engineering organization. You will report to the QA Director, be a senior member of the cross-functional agile team and work closely with Engineering, Product, Operations, and Design teams.
Be a part of the cross-functional agile team to contribute to the quality of Mercury’s next-generation shipment platform by designing, documenting, coding, fixing, testing, and enjoying what you build
Create detailed, comprehensive, and well-structured test plans and test cases that will cover all possible customer use-case scenarios
Perform different types of testing (functional testing and non-functional testing) by using manual and automation techniques and record test results
Coordinate and create automation activities around regression testing, UI testing, API testing, and Cross Browser testing
Create and maintain test documentation
Report and track issues accurately and effectively
Work closely with a team of Product Managers and Architects to analyze and clarification of customer requirements, plan the process of testing, estimate, prioritize, plan, and coordinate quality testing activities
Collaborate with DevOps engineers to integrate automated tests into CI/CD pipeli
Work with the Architects and Development team closely to identify issues, capture required data, discuss fixes, and re-test the fixed defects
Work with the QA team to analyze testing, and improve and optimize testing processes
Be an owner and a champion of platform and application quality and the customer experience
Our Tech Stack
Java (Rest-Assured)
Playwright (TypeScript)
PostgreSQL
GitHub
CI/CD (GitHub Actions / etc.
Docker (optional)
You have
Bachelor’s degree in Computer Science or a related field
5+ years experience as an SDET
Strong programming skills in Java and/or TypeScript, with hands-on experience in test automation frameworks.
Experience in UI device/browser-based test automation using Playwright
Experience in API (REST) test automation using Rest-assured
Familiar with Automation methodologies (Data Driven, Hybrid, BDD, POM)
Hands-on experience in SQL (Analytical Functions and complex queries) and DB testing
Experience with CI/CD tools and pipelines
Proficient understanding of code versioning tools, such as Git
Experience with performance testing tools (k6, Locust, JMeter, etc.)
Experience testing modern web-based applications and distributed systems
Experience with test case design using various techniques/approaches to achieve optimal test coverage
Experience with test data generation and selecting the right test data
Experience in test execution and test reporting
Well-versed with various types of testing (like e2e, regression, smoke, etc.)
Good understanding of software development life cycle
Key Skills
Fluent in English.
Passion for learning and researching.
Excellent communication capability.
Good understanding of lean/agile values; principles and associated practices.
Attention to detail
Self-Managed
Problem-solving and conflict-resolution ability
Team Player
Bonus if you have
Masters or higher studies in Computer Science or related fields.
Valid ISTQB certification.
Understanding Docker and Kubernetes.
Knowledge of test methodologies, processes, and their corresponding tools like Jira X-Ray.
Experience with Cucumber Behavior-Driven Development (BDD) framework.
Knowledge of Node.js and related frameworks
Experience with Linux operating System shell commands and scripting
We Offer
Competitive salary in USD
Fully remote work in working hours of Turkey
Supplementary health insurance (ÖSS) covering you and your immediate family
20 days of paid holidays including the first year of employment
Birthday off