Postman Experts in Düsseldorf
for reliable API testing, documentation and delivery, matched with vetted freelancers in minutesHire experts who design API test suites, automate request workflows and publish clear documentation with Postman and Newman. FRATCH connects you with precise, fast-matched freelance specialists who are vetted and available.
Meet FRATCH Experts in Düsseldorf, who have recently used Postman
Humayun S.
Last position:
Senior Test Manager - Lead at Star Finanz GmbH
- QA Lead for end-to-end quality assurance of the Sparkasse & Sparkasse Business banking apps (iOS/Android); design and implementation of the Test Strategy including functional testing, regression testing, and UAT for eID, Push Notifications, and white-label components
- Creation and maintenance of test concepts and test plans in TestRail; structured Defect Management and error analysis; stakeholder management and risk management for the early identification of critical quality risks
- Accessibility Testing according to WCAG 2.1 (iOS/Android); coordination of AI-supported test automation and optimization of test processes to shorten release cycles
- Release Management: planning, management, and coordination of all test activities; status reporting to management and stakeholders; quality assessment of releases and release recommendations in an Agile/Scrum environment
- Challenge: Highly complex build and release process across several Sparkasse institutions; close coordination with the DevOps team to stabilize the CI/CD pipeline and ensure reproducible test builds before every release.
Tools: Jira, Confluence, TestRail, Android Studio, Xcode, Firebase, Jenkins, GA4
- Success: Successful launch of the eID authentication process - quality assurance ensured for 50+ Sparkasse institutions
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.
Anupriya P.
Last position:
Senior Software Engineer at Telefonica Germany
(Maternity/Parental Leave: July 2023 – Aug 2024)
- Domain: Payment Domain | Client: Telefonica Germany
- Project: General Payment Service
The General Payment Service is responsible for processing of online payments via external payment service provider like Safer pay and PayPal
- Developed Design of Use (DOU) and interface contract documentation, ensuring clarity and compliance across system integrations
- Designed and delivered REST/SOAP web services with Spring Boot and Spring Data JPA, publishing Swagger contracts through WSO2 API Gateway to improve accessibility and governance.
- Spearheaded the on-premises to AWS Cloud migration, re-platforming from Oracle to PostgreSQL on AWS RDS and deploying services on EC2, improving scalability and cost efficiency.
- Containerized microservices using Docker and orchestrated deployments with Kubernetes, streamlining deployment pipelines and improving system reliability.
- Implemented proactive monitoring and logging via AWS CloudWatch and Kibana, ensuring stability and performance during cutover.
- Enhanced collaboration through code reviews and peer reviews, promoting maintainability and clean coding standards.
- Strengthened quality by writing comprehensive JUnit tests and preparing detailed test cases enabling early defect detection
- Delivered automated API testing with Ready API, Postman, and SOAPUI, and conducted performance testing with JMeter, ensuring reliability in high-transaction environments.
Alexander R.
Last position:
Business Analyst at Financial Services Provider Landesbank
The Helaba ATLAS project aims to modernize core systems and make them future-proof. As part of the subproject, the existing legacy system for international payments is being replaced by a modern web-based application.
- Analysis of functional and technical requirements
- Analysis and optimization of business processes
- Process modeling
- Preparation and facilitation of workshops
- Defining project scope and prioritizing requirements
- Business process management (analysis, modeling, and optimization)
- Specification of user stories
- Designing business and authorization concepts
- Testing and acceptance
- Designing mockups in Figma
- Creating the UI/UX style guide for web applications Approach: Scrum (agile) Technologies: Jira, Confluence, MS Teams, Conceptboard, Java, Vaadin, Figma
Peter H.
Last position:
Product Owner / Senior Business Analyst
- Analysis of the possibility of transferring market location data to a separate microservice in an overarching web portal
- Development of a more user-friendly target process based on the current process in coordination with users
- Coordination of the related architecture concept with architects/developers
- Coordination of the related epics and user stories with the relevant business departments
- Backlog prioritization and project planning (including effort estimation)
- Testing and acceptance of implemented user stories
- Technologies/tools used: MS Office, Jira, Mural, Kotlin, React, GitHub, MS Azure, SQL, Postman, XML, JSON, Kafka, Balsamiq, BPMN
Alois G.
Last position:
Bank DZ Privatbank S.A.
- Various programming tasks as specified
- Work carried out from home office, meetings/tasks via email, phone and Microsoft Teams
- Version control via GIT
- Implementation with RDI, FreeSQL SQL
- Extension of automatic test environment creation as specified - adding automatic transfer of existing iSeries users and preparation as well as anonymization of test data
- Creation of trigger and service programs in SQLRPGLE, FreeRPG, ILE RPG and CLLE
- Development and implementation of the CallKredite project including additional extensions for other departments
- Conversion of RPG to Free-RPG and SQL as well as extension of existing modules as specified
- Migration to a new banking release
- Support for specialist segment / OIV
Mitali S.
Last position:
Freelancer at Fintom8 Fintech AI UG
- Built and launched the AI-powered “E-Invoice Corrector,” an intelligent system for validating and correcting invoices, using Python, FastAPI, and machine learning. The system is now live at Fintom8.
- Converted the Corrector into a fully functional API, published with Swagger documentation for easy access and integration by internal and external consumers.
- Designed, experimented with, and optimized advanced LLM prompts and meta-prompting strategies to improve automated reasoning, error correction, and decision-making in agent workflows.
- Wrapped and integrated existing APIs within the Google Agent Development Kit (ADK) framework to enhance automation capabilities and conversational AI workflows.
- Implemented comprehensive unit testing using pytest and unittest, and employed breakpoint debugging (VS Code, pdb) to ensure code reliability, maintainability, and smooth runtime execution.
- Utilized Pydantic and Tabulate for structured data validation, API schema management, and clear tabular data representation in testing and debugging workflows.
- Pursuing the Google Cloud Professional Certificate.
Jan G.
Last position:
Master Data Application at confidential
Visualization, search, and maintenance of various types of master data, providing them via a REST API, and implementing a variety of import and export formats.
Implementation, architecture, project management.
Technologies and tools: Angular (Signals, Signal Store, swagger-codegen, standalone components), Java, PostgreSQL, ActiveMQ, JavaScript, Spring Boot (Spring Core, Spring MVC, Spring Data/JPA via Hibernate, Spring Security, Spring Modulith), JUnit, Flyway, QueryDSL, GraphQL, REST API, Node, npm, Maven, SonarQube, GitLab CI/CD pipelines, Docker, Nexus, OpenAPI + Swagger UI, Keycloak, OAuth2, OpenID Connect, IntelliJ IDEA, Jira, Confluence.
Sebastian C.
Last position:
Public institution responsible for educational institutions in NRW
- Consulting on processes and execution of load tests, performance tests and technical tests of various applications: web portal, file cloud, email, video conferencing, learning/course platform
- Creating the load test framework
- Programming test scripts (JMeter, Selenium)
- Developing batches to support the evaluation
- Executing load tests and evaluating results, including clear reporting, recommendations for action, and bottleneck analysis
- Managing tasks and collaboration to achieve meaningful load test results
Rishu K.
Last position:
Java Technical Lead (Agile Developer) at Accenture
- Led the development of robust, scalable, and high-performance micro-services architecture.
- Migrated legacy monolith systems to Spring Boot with RESTful APIs.
- Designed, implemented, deployed, tested, and optimized scalable backend systems ensuring high availability and performance.
- Maintained and deployed Dockerized applications on Kubernetes integrated into CI/CD pipelines.
- Collaborated with cross-functional teams, including frontend developers, product managers, and designers, to translate business requirements into scalable and efficient backend solutions.
- Mentored team members and contributed meaningful code reviews.
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
Discover over 15,000 top freelancers
Statistics of experts using Postman
Aggregated from the professional profiles of matched freelancers.
Experience
16 years
Position duration
2 years (Germany: 1.8 years)
Positions per freelancer
12
Top business areas
Information Technology, Product Development, Project Management
Top industries
Information Technology, Banking and Finance, Retail
Certification focus areas
Information Technology, Project Management, Product Development
Bachelor's degree or higher
88% (Germany: 93%)
Master's degree or higher
50% (Germany: 59%)
Certifications per freelancer
4 (Germany: 3)
Most common languages
German, English, Hindi
Speak two or more languages
100% (Germany: 97%)
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 Düsseldorf 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 Düsseldorf using Postman
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.
Postman 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 (100%)
- Banking and Finance (82%)
- Retail (64%)
- Professional Services (45%)
- Manufacturing (36%)
- Telecommunication (36%)
- Automotive (27%)
- Insurance (27%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
API work with Postman
Postman is a collaborative API platform for sending requests, inspecting responses and validating how services behave. Teams use its desktop and web applications to explore REST, GraphQL and SOAP interfaces, while collections keep related requests, examples and variables organized. It supports work from early API design through release validation.
Testing and automation
Postman helps teams turn manual checks into repeatable API tests. Professionals create assertions for status codes, response bodies, headers, authentication and business rules, then run collections in pipelines with Newman or Postman CLI. This makes regression coverage easier to maintain as services change.
- Build reusable request collections and environments
- Add positive, negative and contract-focused checks
- Run tests in continuous integration workflows
- Investigate failures with response history and logs
Ecosystem and delivery
Strong Postman work connects API activity with the wider delivery toolchain. Specialists work with OpenAPI definitions, webhooks, mock servers, monitors, environment variables and version control. They may also connect collection runs to GitHub Actions, GitLab CI, Jenkins or reporting systems, while protecting secrets and separating team environments.
When expertise matters
Companies often bring in freelance Postman expertise when an API program lacks consistent tests, usable documentation or a dependable release process. This is especially useful during service migrations, partner integrations, mobile backend launches and the introduction of microservices. In Düsseldorf, specialists may support local product teams on-site, remotely or in a hybrid setup.
- Standardize collections across teams and environments
- Convert API examples into reliable acceptance checks
- Prepare partner-facing documentation and mock endpoints
- Diagnose authentication, data and integration failures
Choosing a specialist
A capable professional understands that Postman is more than a request-sending interface. They can model realistic data flows, manage variable scope, write maintainable JavaScript tests and explain failures clearly. Look for evidence of API lifecycle work, CI integration, security awareness and documentation that another team can use without guidance.
Project collaboration
Postman projects depend on clear API contracts, representative test data and access to the right environments. Before work begins, agree on ownership of collections, review rules, credentials, branching and reporting. German and English collaboration can both be practical in Düsseldorf, provided terminology, handovers and escalation paths are explicit.
Frequently asked questions
The facts hiring teams ask for most often when it comes to Postman.
Postman is used to design, send, test and document API requests. Companies use it to validate integrations, create reusable collections, simulate examples with mock servers and run checks before or during delivery.
Postman combines request exploration, collection-based testing, collaboration, documentation and automation in one workspace. Insomnia can suit lightweight API work, while SoapUI is often chosen for specialized service testing; the right choice depends on protocols, team workflows and pipeline needs.
A strong Postman specialist should understand HTTP, REST, GraphQL, JSON, authentication and API design practices. Useful adjacent skills include OpenAPI, JavaScript test scripting, Git, CI systems, Newman or Postman CLI, and troubleshooting across databases or message services.
A Postman project needs enough experience to match its scope, not a fixed amount of time. A simple collection may need focused API testing knowledge, while a multi-service program calls for lifecycle design, environment strategy, CI automation and careful test-data management.
Postman supports remote collaboration because collections, documentation and test results can be shared across teams. On-site sessions in Düsseldorf can still help when specialists must align closely with product, security or integration teams, but clear access and communication practices are usually more important than location.
Review whether Postman collections are readable, reusable and safe across environments. Ask for examples of meaningful assertions, negative-path coverage, stable test data, clear documentation and pipeline results that help a team act on failures.
Postman can support automated regression testing through collection runners, monitors, Newman and Postman CLI. It works best when tests are focused, data is controlled, environments are separated and failures are reported in a way the delivery team can investigate.
Freelancers using Postman should clarify API ownership, credentials, environments, review practices and the expected handover format before starting. Teams in Düsseldorf may work in German, English or both, so agreeing on documentation language and meeting expectations early prevents avoidable friction.
The average hourly rate of freelancers in Dusseldorf, Germany who have used Postman in their recent projects is 88 €, which corresponds to a daily rate of about 701 € based on an 8-hour working day.
Of the freelancers in Dusseldorf, Germany who have used Postman in their recent projects, 88% hold at least a Bachelor's degree and 50% hold at least a Master's degree.
On average, freelancers in Dusseldorf, Germany who have used Postman in their recent projects have 16 years of professional experience, with a single engagement typically lasting around 2 years.
The most common languages among freelancers in Dusseldorf, Germany who have used Postman in their recent projects are German (100%), English (100%), and Hindi (18%).
The most common industries among freelancers in Dusseldorf, Germany who have used Postman in their recent projects are Information Technology (100%), Banking and Finance (82%), and Retail (64%).
The most common business areas among freelancers in Dusseldorf, Germany who have used Postman in their recent projects are Information Technology (100%), Product Development (82%), and Project Management (73%).
Main locations of FRATCH Experts, who have recently used Postman
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.
Berlin 
Hamburg 
Munich 
Cologne 
Frankfurt 
Stuttgart 
Essen Request a free demo
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Philipp Thomaschewski
FRATCH CEO
