TestNG Experts in Cologne
for reliable test automation, matched in minutesHire experts who create maintainable Java test suites with TestNG, Selenium, REST clients and CI pipelines. FRATCH quickly matches you with vetted, available freelancers whose skills fit your project and delivery goals.
Meet FRATCH Experts in Cologne, who have recently used TestNG
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.
Predrag P.
Last position:
Test Developer | Test Automation Engineer at CreditReform
Technologies: Java 25, Selenium, Insomnia, SSO, Gitlab, Jenkins, Docker, Kubernetes, Jira, IntelliJ, Nexus, Oracle, MariaDB, SpringBoot, Grafana, Concept Board, Vue.js, OpenApi, Kotlin. Implementation, maintenance, and enhancement of automated end-to-end regression tests for UI and API interfaces. Appropriate and targeted test automation involving multiple software products, including Java-based Windows applications. Automation of business processes with Selenium, reset jobs, and DB import jobs, as well as creation of test concepts, test case descriptions, and structured defect reporting.
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
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
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
1.6 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, Croatian
Speak two or more languages
100%
Based on our profile pool as of 29 Oct 2026.
Daily rate distribution
The chart shows how the daily rates of experts in this technology in Cologne are distributed, based on recent contracts on our platform. Each bar covers a rate range — its height shows the share of experts charging 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 29 Oct 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 practice
TestNG is a Java testing framework for unit, integration and end-to-end tests. Its annotations, suites, data providers and dependency controls help teams organize complex test runs. The name expands to Test Next Generation and is often chosen for structured automation around Java applications.
What it can build
TestNG supports repeatable quality checks across APIs, web interfaces and service layers. Professionals use it to turn acceptance criteria into automated suites that run locally and in continuous integration.
- Parameterized tests with data providers
- Parallel execution for suitable test groups
- XML-based suite and group configuration
- Test reports for build and release decisions
Ecosystem and tooling
Strong TestNG specialists understand the surrounding Java toolchain, not only annotations. They commonly connect TestNG with Selenium or Appium, REST Assured, Maven or Gradle, and CI systems such as Jenkins or GitHub Actions. They also work with reporting, mocking and source control practices.
When companies need specialists
Freelance expertise is useful when an existing suite is slow, unstable or difficult to extend. It also helps during a migration from JUnit, the introduction of browser automation, or the setup of reliable quality gates for a growing release process.
- Stabilizing flaky tests and test data
- Designing suites for parallel CI execution
- Integrating TestNG into Maven or Gradle builds
- Reviewing coverage, reports and failure handling
Collaboration in Cologne
Companies in Cologne may need TestNG professionals for product teams, digital services, logistics, media or enterprise software. A specialist can work on site, remotely or in a hybrid setup, provided the team agrees on repositories, environments, review routines and communication language.
Signs of strong expertise
A capable professional separates test intent from implementation details and keeps failures easy to diagnose. They manage waits, isolation, fixtures, dependencies and cleanup carefully instead of masking defects with retries. Ask for examples of maintainable TestNG suites, CI integrations and decisions about when TestNG is preferable to JUnit.
Frequently asked questions
Not sure where to start with TestNG? These answers cover the essentials.
TestNG is used to create and run Java tests for unit, integration, API and browser-based scenarios. It provides annotations, groups, data providers, dependencies, suite configuration and parallel execution. A freelancer can adapt these features to the risk and architecture of your application.
TestNG and JUnit both support Java test automation, assertions and integration with build tools. TestNG is often selected for flexible groups, data providers, suite definitions and dependency handling, while JUnit is deeply established in many Java projects. The better choice depends on the existing codebase, team habits and required test structure.
A strong TestNG freelancer usually also understands Java, Maven or Gradle, version control and CI pipelines. Selenium, Appium, REST Assured, mocking libraries and test reporting are valuable when the work covers web interfaces or APIs. Experience with Docker and test environments can also reduce setup problems.
The right level depends on the task rather than the framework alone. A focused suite extension may need solid Java and TestNG knowledge, while a migration, parallelization effort or unstable enterprise suite calls for someone who can analyze architecture, environments and CI failures. Ask candidates to explain comparable decisions and trade-offs.
Yes. TestNG projects can be handled remotely when the professional has secure access to repositories, test environments, logs and build pipelines. Teams in Cologne should define review practices, overlap hours and whether German, English or both are needed for documentation and collaboration.
TestNG suites can run through Maven or Gradle in CI systems such as Jenkins, GitHub Actions or GitLab CI. Specialists configure suite selection, parallel execution, environment parameters and report publication so failures remain visible rather than being ignored. They also separate fast feedback from longer end-to-end runs.
A maintainable TestNG suite has clear naming, focused tests, controlled data and dependable setup and cleanup. Good professionals avoid unnecessary dependencies, isolate browser and service state, and make failure output useful. They review flakiness as a defect instead of hiding it with repeated retries.
Ask a TestNG specialist to describe how they would structure suites, handle data providers, diagnose flaky tests and integrate results into CI. Look for practical reasoning about isolation, waits, environments and reporting, not only familiarity with annotations. A small code review or technical discussion can reveal whether the approach will remain maintainable.
The average hourly rate of freelancers in Cologne, Germany who have used TestNG in their recent projects is 84 €, which corresponds to a daily rate of about 672 € 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 1.6 years.
The most common languages among freelancers in Cologne, Germany who have used TestNG in their recent projects are German (100%), English (100%), and Croatian (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
