Java Servlet Experts in Cologne
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Meet FRATCH Experts in Cologne, who have recently used Java Servlet
Hooman Behmanesh
Last position:
Fullstack Developer at Möbel Roller GmbH
- Further development of the existing e-commerce platform based on SAP Commerce (Hybris) to meet the growing demands of digital commerce.
- Ensuring the scalability and performance of the backend, so the platform remained stable and efficient even under heavy user load.
- Development and integration of new OCC REST APIs and services for modular extensions and flexible adjustments, to implement new features quickly.
- Optimization of data flows and interfaces, which significantly improved platform efficiency and system performance.
- Ensuring a maintainable and scalable code base by using Clean Code principles, proven design patterns, and a future-proof architecture.
- Reduction of errors through extensive testing with JUnit, Mockito, and load tests with Gatling, supported by the introduction of automated test processes.
- Improved system performance through targeted refactoring measures and efficient database queries, especially to handle peak loads.
- Use of modern cloud and monitoring tools such as Kubernetes, Google Cloud Platform (GCP), and Grafana to ensure a stable and monitored infrastructure.
- Clear improvement in efficiency, scalability, and reliability of the platform, which now meets the demands of a dynamic and growing e-commerce market.
Joaquim Landa Miala
Last position:
Freelance ABAP Developer, Logistics at Cheplapharm
- Tested integration of TIBCO EBX with SAP S/4HANA via TIBCO BusinessWorks – proof of concept
- Implemented use case: communication between TIBCO EBX and SAP S/4HANA via IDocs to exchange material master data and business partner data
- Customized, configured, and implemented inbound and outbound processing in the SAP S/4HANA environment for communication with the TIBCO EBX software interface
- Distributed classes, characteristics, and values between TIBCO BusinessWorks and SAP S/4HANA and customized the inbound processing
- Documented the technical components
Louis Nguenkam
Last position:
Specialist in Adobe Experience Manager & Microservices at Nguenkam Consulting & Engineering
Java 11/21
Springboot
Swagger/OpenApi
Azure Pipelines
Trivy Integration
Apache Sling
OSGI
Java Content Repository (JCR)
Apache Jackrabbit Oak
Adobe HTL
GraphQL
Maven
GitLab
IntelliJ
Azure Cloud
Azure DevOps
Terraform
AEM specialist in the Scrum team
Development and deployment of microservices via Open API interfaces
Operation of microservices in the Azure Cloud
Implementation of AEM modules and integration with microservices
Member of the knowledge transfer team and a backend coordination team
Peter Brungs
Last position:
Data Warehouse Consultant (Development and Analysis) at Atruvia AG
- Developed and enhanced ETL loading jobs with IBM DataStage and optimized SQL in an IBM DB2 environment as part of the Agree21 data migration
- Analyzed data quality and developed test procedures
- Created PowerShell scripts and documented GIT deployment processes
- Technologies: RedHat Linux, IBM DB2 with DBVisualizer, IBM InfoSphere DataStage 11.7, JIRA, TortoiseGIT, TortoiseSVN, PowerShell scripts
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
Allal Kharaz
Last position:
Java Senior Full Stack Developer at Insurance ÖRAG
- Further development of a policy administration system (contract/claims) for the legal expenses insurer ÖRAG.
- My role: Senior Software Developer.
- The team consists of 12 developers.
- Technologies used: Java 8/21, Java EE, Quarkus, WebLogic, JPA, RabbitMQ, JTA, CI, CD, Jenkins, DB2, Maven, Jenkins, GIT (bitbucket) later GitLab, Junit, Elasticsearch, Mockito, Jira, SonarQube, Scrum, React, Workflow
- Migration and modernization of legacy systems: rewrote C and C++ code in Java to improve maintainability, scalability, and performance. Refactored Python into Java, including optimization and integration into modern architectures.
- Study on the use of AI (Codex) for implementing a Java feature. The goal is to compare the time spent and productivity of AI-supported development with a classic implementation by a developer. The results should show how strongly the use of AI affects development time and efficiency.
- Development of the following tariff calculators for the years 2024/2026: private, companies, doctors, farmers, owner-occupied G + H, landlords, traffic, club, top managers, sales representatives, special criminal law, savings bank, municipal, BayGT, doctors, Dehoga
Discover over 15,000 top freelancers
Statistics of experts using Java Servlet
Aggregated from the professional profiles of matched freelancers.
Experience
21 years
Position duration
1.8 years
Positions per freelancer
13
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Energy, Banking and Finance
Certification focus areas
Information Technology, Human Resources, Marketing
Bachelor's degree or higher
67%
Master's degree or higher
67%
Certifications per freelancer
3
Most common languages
German, English, French
Speak two or more languages
83%
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 Java Servlet
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
Servlet basics
Java Servlet is the core Java web API for handling HTTP requests and responses on the server. It powers request routing, form handling, authentication flows, file uploads, and other backend web tasks. Many teams still rely on it directly in Tomcat, Jetty, or full Jakarta EE environments.
Where it fits
- Web applications with custom request logic
- Internal tools and admin back ends
- Legacy Java portals that still run well
- API endpoints behind JSP or framework layers
It is often used when teams want direct control over the web layer without adding heavy abstractions.
Ecosystem skills
Strong professionals working with Java Servlet usually know HTTP, cookies, sessions, filters, listeners, and deployment descriptors. They also understand servlet containers, logging, testing, and integration with JDBC, JSP, Spring, or Jakarta Servlet. Good work here depends on reading request flow clearly and keeping the code easy to maintain.
When to bring in help
Companies bring in freelance expertise when an older Java web app needs fixes, a servlet layer must be stabilized, or a migration is underway from Java EE to Jakarta EE. This is also common when Cologne-based teams need short-term support for a Tomcat deployment or remote help on a release with tight timing.
What strong experts do
- Trace request and response handling cleanly
- Use filters for cross-cutting concerns
- Manage sessions and authentication safely
- Keep servlet code small and readable
- Diagnose container and deployment issues
A strong specialist knows when to keep logic in the servlet and when to move it into services or helpers.
Common signs
If a project has hard-to-track redirects, session bugs, upload issues, or brittle legacy web code, it usually needs servlet expertise. The same is true when documentation is thin and the team needs someone who can work directly with Java Servlet APIs and container behavior. Clear fixes start with understanding the full request lifecycle.
Frequently asked questions
Questions about Java Servlet? Start with the answers below.
Java Servlet is used to handle server-side HTTP work in Java web applications. Teams rely on it for request routing, session handling, authentication flows, file uploads, and integration with other backend services. It is still common in Tomcat and Jetty based systems, especially where the web layer is kept close to the platform.
Java Servlet is lower level than Spring MVC, so it gives direct control over the request lifecycle. Spring often adds structure and convenience on top, while Servlet stays closer to the container and HTTP API. Many systems use Servlet as the base layer even when higher frameworks handle most application logic.
Java Servlet help is useful when a legacy application needs maintenance, a deployment breaks, or a migration needs careful handling. It also helps when a team has code that is difficult to change because the servlet layer mixes business logic with request handling. A specialist can reduce risk without forcing a full rewrite.
A strong Java Servlet specialist usually knows HTTP, cookies, sessions, filters, and listener APIs. Knowledge of Tomcat, Jetty, JSP, JDBC, logging, and testing tools is often important too. For modern projects, familiarity with Jakarta Servlet naming and package changes also matters.
Not always, but the task should match the complexity of the codebase. Small fixes in a simple servlet are different from debugging a multi-step login flow or a production deployment issue. When the application is old, lightly documented, or tied to a specific container, deeper experience helps a lot.
Most Java Servlet work can be done remotely because the tasks are code, configuration, and container focused. On-site help in Cologne can still be useful for urgent workshops, access-limited systems, or teams that prefer direct pairing on legacy stacks. Many projects work well with a hybrid setup.
Look for clear explanations of request flow, session handling, and container behavior in Java Servlet work. Strong professionals produce small, testable changes and can explain why a filter, listener, or servlet is the right place for the logic. They should also be comfortable discussing deployment issues and legacy constraints.
Java Servlet is the common name people use for the servlet API and the request handling layer in Java web stacks. You may also see Servlet API, Java EE, or the newer Jakarta Servlet name, depending on the project age. The exact package names and runtime details matter, especially during migrations.
The average hourly rate of freelancers in Cologne, Germany who have used Java Servlet in their recent projects is 99 €, which corresponds to a daily rate of about 794 € based on an 8-hour working day.
Of the freelancers in Cologne, Germany who have used Java Servlet in their recent projects, 67% hold at least a Bachelor's degree and 67% hold at least a Master's degree.
On average, freelancers in Cologne, Germany who have used Java Servlet in their recent projects have 21 years of professional experience, with a single engagement typically lasting around 1.8 years.
The most common languages among freelancers in Cologne, Germany who have used Java Servlet in their recent projects are German (100%), English (83%), and French (50%).
The most common industries among freelancers in Cologne, Germany who have used Java Servlet in their recent projects are Information Technology (100%), Energy (50%), and Banking and Finance (50%).
The most common business areas among freelancers in Cologne, Germany who have used Java Servlet in their recent projects are Information Technology (100%), Product Development (83%), and Quality Assurance (83%).
Main locations of FRATCH Experts, who have recently used Java Servlet
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.
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