TestNG Experts in Cologne
for reliable Java testing, matched in minutes from over 15,000 CVsHire experts who design maintainable Java test suites, connect TestNG with Selenium or REST Assured, and integrate reliable checks into Maven, Gradle and CI pipelines. FRATCH matches you quickly and precisely with vetted, available freelancers.
Meet FRATCH Experts in Cologne, who have recently used TestNG
Christoph S.
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
Hassan A.
Last position:
DevOps & Observability 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.
- Designed and implemented contract testing to validate API schema compatibility between the order management system and the Zed and Glue layers, reducing production-relevant breaking changes by approximately 3%.
- Led the migration to a multi-environment framework that enabled test execution across 4 country configurations from a single codebase.
- Integrated automated unit and functional tests directly into the GitLab CI/CD pipeline, reducing pipeline runtime by 32%.
- Coached and trained 5 QA engineers across Germany and Hungary in test automation, framework architecture, and best practices.
- Architected a layered backend test automation framework separating business logic, API request builders, and the database layer.
- Piloted AI-assisted testing with Playwright Agents, the Playwright MCP Server, and GitHub Copilot for automated test generation, execution, and self-healing Playwright scripts.
Ayhan G.
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
Predrag P.
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 M.
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 H.
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 K.
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 19 Sep 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 19 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
TestNG experts industry focus
See which industries our matched freelancers work in most often — every figure is calculated live from the freelancers on FRATCH.
- Information Technology (88%)
- Banking and Finance (63%)
- Insurance (63%)
- Retail (63%)
- Telecommunication (50%)
- Automotive (38%)
- Transportation (38%)
- Government and Administration (38%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
TestNG in Java testing
TestNG, short for Test Next Generation, is a Java testing framework for unit, integration and end-to-end checks. It supports annotations, test groups, dependencies, data-driven execution and configurable parallel runs. Companies use it to structure large test suites and make failures easier to isolate.
Core capabilities
TestNG experts define readable test classes, configure suites in XML, manage setup and teardown stages, and create reusable data providers. They can control execution order, separate smoke and regression coverage, and publish useful reports. Strong work keeps tests independent, deterministic and simple to maintain as the product changes.
Tools and ecosystem
TestNG commonly sits within a wider Java quality stack:
- Maven or Gradle build integration
- Selenium WebDriver for browser journeys
- REST Assured for API validation
- Jenkins, GitHub Actions or GitLab CI pipelines
- Allure, Surefire and reporting integrations
Knowledge of Java, version control, test data handling and environment configuration is essential. Experience with containers, databases, cloud test environments and service virtualization can also improve coverage and execution speed.
When expertise matters
Companies bring in freelance TestNG expertise when an existing suite is slow, flaky or difficult to extend. It is also useful when a Java product needs regression coverage before a release, when Selenium tests need restructuring, or when manual checks must become repeatable automated workflows. Cologne teams can combine on-site planning with remote implementation when their delivery process supports both.
Typical deliverables
A specialist may assess the current suite, define a test strategy and implement maintainable checks for critical behavior. Deliverables can include TestNG classes, suite configurations, fixtures, data providers, reporting setup and CI jobs. Good documentation explains how to run tests locally, diagnose failures and add coverage without creating hidden dependencies.
Signs of strong specialists
Look for professionals who explain why TestNG is appropriate instead of adding framework features without a clear need. They should understand test isolation, reliable waits, parallel execution, mocking boundaries and the difference between a failed test and a failed environment. Strong specialists review flaky results, protect test data and connect automated checks to business risk. They also communicate clearly with distributed teams and leave a suite that other Java professionals can confidently extend.
Frequently asked questions
Not sure where to start with TestNG? These answers cover the essentials.
TestNG is a Java testing framework used for unit, integration and end-to-end testing. It is especially useful for grouped suites, data-driven checks, test dependencies and controlled parallel execution. Teams often combine it with Selenium for browser testing or REST Assured for APIs.
TestNG and JUnit both support Java tests, assertions and lifecycle methods, but they differ in annotations, suite configuration and execution features. TestNG is often chosen for flexible grouping, dependencies, data providers and XML-based suite control. The right choice depends on the existing codebase, team familiarity and reporting or CI requirements.
A strong TestNG expert usually also understands Java, Maven or Gradle, Git and continuous integration. Selenium, REST Assured, SQL, mocking tools and test reporting are valuable when the work covers browser, API or integration checks. Knowledge of Docker and cloud environments can help when tests run outside a local machine.
The required level depends on the suite’s size, stability and integration points rather than on a fixed duration. A straightforward set of Java checks may need focused framework knowledge, while a flaky Selenium suite or parallel CI setup calls for deeper experience with isolation, synchronization and diagnostics. Ask candidates to explain comparable deliverables and the decisions behind them.
TestNG works well in remote or hybrid teams because test code, suite configuration and CI results can be reviewed asynchronously. Cologne companies should agree on repository conventions, review practices, working hours and communication language before work starts. On-site sessions can still help with discovery, environment access and handover.
TestNG may be a poor fit when a project already has a strong JUnit-based standard and gains little from changing frameworks. It can also be the wrong answer if the real problem is unstable test data, unclear environments or poor application boundaries. A capable specialist should identify those causes before proposing a framework migration.
Review whether TestNG tests are readable, isolated, repeatable and useful when they fail. Ask for examples of suite organization, data handling, parallel execution and CI diagnostics. Quality is visible in stable results, clear reports, sensible coverage and documentation that lets another professional run and extend the suite.
TestNG projects often involve more than writing assertions. Freelancers may need to understand product risks, test environments, browser or API behavior, build plugins, reporting and release workflows. Clear communication matters because test failures can originate in the application, the environment or the test design itself.
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
Get in touch with the FRATCH team and we will get back to you within 4 hours.
Would you rather directly get in touch?
We always have the time for a call or email!
Philipp Thomaschewski
FRATCH CEO
