TestNG Experts in Cologne
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Meet FRATCH Experts in Cologne, who have recently used TestNG
Christoph Sawicki
Last position:
Test Manager at Logistics
- Coordination and planning, execution, documentation, and analysis of test cases
- Development of test concepts considering best practices (e.g., test pyramid) with a focus on reliable, automatable test runs
- Implementation and maintenance of test cases according to the test concepts
- Technologies: Citrix Workspace, Shopify, Jira, Xray, MS Teams, MS SharePoint, Confluence, MS Office 365
Ayhan Gezer
Last position:
Senior QA Engineer / Test Automation Engineer / SDET at Rewe digital
Consulting, designing, and implementing the software testing lifecycle for multiple Android apps and backends Introducing test automation with Appium, SpringBootTest, RestAssured Setting up and managing emulators Developing an E2E library, an integration library, a Testcontainers library, and other libraries Developing, implementing, and advising on CI strategies Building the test environment with Testcontainers and virtualization Developing and implementing test cases for integration tests and end-to-end tests Establishing a maintainable test architecture with low entry barriers to simplify the creation of automated tests Some tools and technologies used: JUnit, RestAssured, Testcontainers, Kubedock, Appium, Android emulator, Jira Xray, Mockito, WireMock, Spring Framework, Kotlin
Hassan Amjad
Last position:
IT Consultant at ALDI South (Albrecht's Discount)
- Supporting the DevOps team in Terraform-managed, multi-region AWS infrastructure to achieve environment parity.
- Developed end-to-end CI/CD pipelines using AWS CodePipeline, CodeBuild, and CodeDeploy, automating the build and deployment.
- Maintained pre- and post-deployment scripts to automate critical tasks such as database schema migrations and environment sanity checks.
- Implemented CI/CD flow specifically for hotfixes via separate Git branches, managing back-merge activities from feature branches to release branches to ensure code integrity through automated conflict resolution.
- Deployed a dedicated, lightweight sanity check application hosted cost-effectively on Azure Container Apps to run automated health and basic functional checks as a post-deployment activity triggered via pipeline.
- Investigated production incidents through code changes and AWS CloudWatch logs.
- Coordinated integration of Dynatrace APM and its APIs for monitoring purposes.
- Full stack QA strategist for a high-traffic e-commerce platform built on a layered architecture for the back-end testing of core platform services, especially the order management system in Zed and Glue layers.
- Managed automation activities, testing process, and refactoring practices.
- Responsible for framework migrations, setup, and training for new automation frameworks.
- Promoted a shift-left approach within the QA team and created the test concept.
- Participated in meetings with IT managers, business owners, product owners, and team members.
Predrag Perovic
Last position:
Test Developer | Test Automator at CreditReform
Technologies: Java 25, Selenium, Insomnia, SSO, GitLab, Jenkins, Docker, Kubernetes, Jira, IntelliJ, Nexus, Oracle, MariaDB, Spring Boot, Grafana, Concept Board, Vue.js, OpenAPI, Kotlin. Implementation, maintenance, and extension of automated end-to-end regression tests for UI and API interfaces. Appropriate and targeted test automation across multiple software products, including Java-based Windows applications. Automating business processes with Selenium, reset jobs, and DB import jobs, as well as creating test concepts, test case descriptions, and structured bug reporting.
Vladimir Maznicenko
Last position:
Developer at Financial services provider
- Support and further development of a framework for developing applications in a banking association: DynS/OSPE
- Migration of the framework to Java 11 and Java 17
- Java8, Java11 and Java17, Spring, Spring-Batch, Spring WebServices, Spring-Security, Spring-Data, JPA, Hibernate, OpenSource libraries etc.
- XML, JAXB, JSON, REST and SOAP services, DB2, Oracle, WebSphere or Liberty AS, FreeMaker, Junit, mock libraries, JaCoCo, Maven, IntelliJ, Eclipse, GitHub, SVN, Jira
Jacqueline Haefke
Last position:
Kitchen Appliance Manufacturer
Setting up and enhancing an international subscription management system
Migrating and decommissioning a Hybris-SAP system and integrating Zuora
Implementing numerous interfaces to various systems (external and internal)
Setting up and improving monitoring with Grafana, Prometheus, and Databricks
Introducing logging with Loki
Implementing business requirements using jQuery, Thymeleaf, Spring Boot, Java, Go, and Python
Adjusting and extending the GitLab CI pipelines
Setting up and extending infrastructure as code with Terraform and ArgoCD on AWS
Setting up and running E2E and performance tests
Expanding the Databricks business intelligence solution to provide various KPIs
Responsibilities: Architecture, DevOps, development, unit tests, coaching employees and apprentices, E2E, smoke, and integration tests, agile methods consulting (Kanban, Scrum)
Technologies and methods: Java, Go, Kotlin, Node.js, Spring Boot, SOAP/REST, Quarkus, Thymeleaf, Vaadin, Slack, Jira, Confluence, IntelliJ, GitLab, SQS, Kafka, AWS, Kubernetes, Terraform, Maven, Gradle, GitLab CI, Databricks
Last position:
Rewe Digital
- Creation of Spring Boot integration tests
- Creation of JUnit tests for the coupon system
- Creation of component tests for Kafka topics
- Creation of CI/CD pipeline scripts
- Creation of UI tests with Playwright
- Creation of UI tests with Cypress
- Review of developer unit tests
- Planning the test architecture for integration tests
- Creation of the test automation concept
- Evaluation and creation of test reports
Jacqueline Krech
Last position:
OTTO
- Design, development, and monitoring of microservices
- Migrating functions from a monolithic system into separate microservices
- Designing and implementing new microservices (backend and frontend)
- Setting up and maintaining a CI/CD pipeline (GitHub Actions)
- Configuring cloud infrastructure with AWS CDK and Terraform
- Designing and implementing event-driven communication with AWS SNS/SQS and Apache Kafka
- Ensuring code quality through Test Driven Development (TDD), static code analysis, and Clean Code
Discover over 15,000 top freelancers
Statistics of experts using TestNG
Aggregated from the professional profiles of matched freelancers.
Experience
16 years
Position duration
1.5 years
Positions per freelancer
13
Top business areas
Information Technology, Quality Assurance, Product Development
Top industries
Information Technology, Banking and Finance, Insurance
Certification focus areas
Information Technology, Quality Assurance, Product Development
Bachelor's degree or higher
100%
Master's degree or higher
75%
Doctorate
25%
Certifications per freelancer
4
Most common languages
German, English, Polish
Speak two or more languages
100%
Based on our profile pool as of 30 Aug 2026.
Daily rate distribution
The chart shows how the daily rates of freelancers in this technology in Cologne are distributed, based on recent contracts on our platform. Each bar covers a rate range — its height shows how many freelancers charge within that range.
Average rates of experts in Cologne using TestNG
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 30 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
About the technology
Test focus
TestNG is a Java testing framework used for unit, integration, and end-to-end test automation. Teams use it to structure suites, control execution order, and keep large test sets readable. It fits projects where testing needs more flexibility than basic JUnit setups.
Common work
- Build TestNG suites for Java applications
- Set up data-driven tests with annotations and data providers
- Organize parallel runs and test groups
- Add assertions and reporting to CI pipelines
- Stabilize flaky automated tests
Ecosystem
TestNG often sits next to Selenium, Maven, Gradle, Jenkins, and Git-based delivery flows. Strong professionals know how TestNG.xml, annotations, listeners, and parameters work together. They also understand when to pair it with JUnit or move older suites into a cleaner TestNG setup.
When to hire
Companies bring in TestNG specialists when test automation grows hard to maintain, when release pipelines need more reliable checks, or when teams inherit mixed Java test code. In Cologne, this often matters for software teams that work in-house with local stakeholders or remotely with distributed product groups.
What good experts do
Good TestNG experts write tests that are clear, isolated, and easy to extend. They avoid brittle setup, keep assertions focused, and design suites that still make sense months later. They also spot gaps in coverage, test data, and reporting before those gaps slow delivery.
Signs you need help
- Your suite is slow or inconsistent
- Parallel execution causes conflicts
- Existing tests are hard to read or reuse
- CI feedback is noisy or incomplete
- Your team needs support migrating legacy Java tests
Frequently asked questions
Not sure where to start with TestNG? These answers cover the essentials.
TestNG is used to automate testing for Java code, from small unit checks to broader integration and regression suites. It helps teams organize tests with annotations, groups, parameters, and data-driven cases. Many teams choose it when they need more control over execution than a simple default setup provides.
TestNG and JUnit both support Java testing, but TestNG gives more built-in options for grouping, dependencies, and parallel runs. JUnit is often the first choice for simpler setups, while TestNG can fit larger suites that need more structure. A strong freelancer can explain which mix works best for your codebase.
A strong TestNG specialist usually knows Java well and can work with Maven or Gradle, Git, and CI tools like Jenkins. For UI testing, Selenium is a common companion skill. Knowledge of test design, flaky-test cleanup, and reporting is just as important as framework syntax.
TestNG help is useful when tests are growing faster than the team can maintain them, or when a release pipeline needs more dependable checks. It also helps if your current suite is hard to read, slow to run, or built from legacy patterns. Outside support can speed up cleanup without forcing a full rewrite.
Yes, TestNG is often used to manage Selenium test suites because it handles setup, grouping, and execution control well. That combination is common for browser-based testing in Java teams. Good experts know how to keep page objects, waits, and assertions tidy so the suite stays stable.
TestNG work is often remote-friendly because test suites, build files, and CI pipelines can be reviewed and improved online. On-site sessions in Cologne can still help when a team wants fast workshops, shared debugging, or close work with local product and engineering stakeholders. The right setup depends on how your team collaborates.
Look for a TestNG expert who can explain why they chose a test structure, not just how they wrote it. Good signs are clean annotations, sensible test data, stable CI runs, and clear reporting. Ask for examples of flaky-test fixes or suite redesigns rather than only screenshots of passing tests.
For TestNG work, ask what Java version the suite targets, how tests are built, and whether the project uses Maven or Gradle. You should also ask about the current reporting tool, CI flow, and any older JUnit code that needs coexistence or migration. Those details shape the approach and the effort.
The average hourly rate of freelancers in Cologne, Germany who have used TestNG in their recent projects is 86 €, which corresponds to a daily rate of about 685 € based on an 8-hour working day.
Of the freelancers in Cologne, Germany who have used TestNG in their recent projects, 100% hold at least a Bachelor's degree, 75% hold at least a Master's degree, and 25% hold a doctorate.
On average, freelancers in Cologne, Germany who have used TestNG in their recent projects have 16 years of professional experience, with a single engagement typically lasting around 1.5 years.
The most common languages among freelancers in Cologne, Germany who have used TestNG in their recent projects are German (100%), English (100%), and Polish (13%).
The most common industries among freelancers in Cologne, Germany who have used TestNG in their recent projects are Information Technology (88%), Banking and Finance (63%), and Insurance (63%).
The most common business areas among freelancers in Cologne, Germany who have used TestNG in their recent projects are Information Technology (100%), Quality Assurance (100%), and Product Development (75%).
Main locations of FRATCH Experts, who have recently used TestNG
Our freelancers and interim experts are at home across the DACH region — available on-site in the major business hubs or fully remote. Choose a location to discover matched specialists, local market insights and up-to-date availability.
Countries:
Berlin Hamburg Munich 
Cologne Frankfurt Stuttgart Dusseldorf Leipzig Dortmund Essen Bremen Dresden Hanover Nuremberg Request a free demo
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Philipp Thomaschewski
FRATCH CEO
