jQuery Experts in Cologne
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Meet FRATCH Experts in Cologne, who have recently used jQuery
Hooman B.
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.
Vitaliy M.
Last position:
Team Lead Development with a focus on lead generation at one of Germany's largest insurance companies
- Backend WordPress web development.
Thomas P.
Last position:
Freelance Software Architect at Self-employed
Florian R.
Last position:
Senior Fullstack Developer at Ivii GmbH
- Two-month modernization of the management UI for AI-powered cameras
- Rewrote a complex React application to Vue 3 with single file components
- Set up the core architecture of the Vue application and configured Vite, Pinia, Router, I18n, ESLint, and Prettier
- Custom integration of Leaflet to display detection zones on images
- Assisted with backend extension and authentication adjustments
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
Louis N.
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
Dirk H.
Last position:
Owner at Soorce GmbH
- On secondment to REWE digital GmbH
- Agile team coach for a brick-and-mortar retail team
- Coaching, lateral leadership and facilitation
- Establishing agile values and applying agile methods
- Team development and conflict moderation
- Facilitating company-wide strategy workshops
- Technologies: Kanban, Scrum, Microsoft Teams, Liberating Structures, Jira, Confluence, Concept Board, Miro, Test-Driven Development, OOP, DBMS (SQL, MySQL, MariaDB, PostgreSQL)
Ingo C.
Last position:
Founder, freelance CMS expert at CMS Consulting Cousin
- Freelance work as a CMS expert
Cedric J.
Last position:
Co-Founder / CTO at Infinite Hooray ApS
- Develop powerful add-ons for customer service systems with innovative Zendesk apps designed to drive business growth, improve efficiency, and enhance customer satisfaction
- Implement full Zendesk solutions and provide hands-on support to bring customer service vision to life
- Combine customer service and technology expertise to address the complexities of delivering top-notch customer service
- Execute Zendesk implementations in 20+ countries and develop AI apps that automate replies
- Maintain a proven track record of success in advancing customer service capabilities
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
Kay O.
Last position:
Fullstack Developer at INIT GmbH
- Development of monitoring and control systems for public transport
- Development of a platform for real-time monitoring of passenger information and ticketing systems and an application for remote control and status monitoring of access systems
- Development of dynamic forms, complex tables, real-time dashboards (SignalR), and reusable components in the frontend (using Storybook)
- Implementation of REST interfaces in the backend
- Deployment to Microsoft Azure Cloud
- Technologies used: Angular 20, Angular Material 3, Dev Extreme, Storybook, C#/.NET 10
Annick W.
Last position:
Freelance Senior Frontend Developer at ROSE Bikes GmbH
Alexander S.
Last position:
TYPO3 Senior Fullstack Developer, Backend & Frontend at Vergleich.de Gesellschaft für Verbraucherinformation mbH via HALIAN GmbH
- Typoscript
- Extbase
- Fluid
- Typescript
- requireJS
- WebVital
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 jQuery
Aggregated from the professional profiles of matched freelancers.
Experience
21 years
Position duration
2.7 years (Germany: 5.3 years)
Positions per freelancer
11 (Germany: 13)
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Insurance, Retail
Certification focus areas
Information Technology, Product Development, Marketing
Bachelor's degree or higher
100% (Germany: 84%)
Master's degree or higher
71% (Germany: 45%)
Doctorate
29% (Germany: 6%)
Certifications per freelancer
2
Most common languages
German, English, French
Speak two or more languages
100% (Germany: 96%)
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 jQuery
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.
jQuery 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 (93%)
- Insurance (57%)
- Retail (50%)
- Banking and Finance (29%)
- Media and Entertainment (29%)
- Professional Services (29%)
- Automotive (21%)
- Manufacturing (21%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
What jQuery does
jQuery is a JavaScript library for selecting and updating HTML elements, handling browser events and creating asynchronous requests with concise syntax. It remains common in established websites, content systems and business applications where dependable browser behavior matters. Teams use it to improve interfaces without replacing an entire front end.
Common project work
jQuery specialists support practical interface and maintenance tasks:
- Build form validation, menus, tabs, modals and interactive filters
- Connect pages to REST endpoints with AJAX and update content dynamically
- Refactor legacy scripts and remove duplicated event-handling code
- Adapt interfaces for responsive layouts and current browser behavior
- Integrate plugins for tables, calendars, uploads and rich form controls
Ecosystem and skills
Strong work with jQuery includes JavaScript fundamentals, HTML, CSS and the browser DOM. Specialists may also work with jQuery UI, Bootstrap, RequireJS, webpack, npm and common content management systems. Knowledge of REST APIs, JSON, accessibility, browser debugging and testing helps keep changes reliable.
When companies need help
Companies often bring in freelance expertise when a legacy interface has become difficult to maintain, a migration must happen gradually or a release depends on targeted browser-side changes. A specialist can trace event conflicts, improve slow selectors, replace outdated plugins and document the result. In Cologne, this work may fit both local collaboration and remote delivery for distributed product teams.
What quality looks like
Good professionals separate presentation, behavior and data access instead of adding scripts directly to every page. They use delegated events where appropriate, keep selectors readable and check behavior across supported browsers. They also consider keyboard access, error states, security boundaries and the impact of asynchronous requests on users.
Working with modern stacks
jQuery is often one part of a wider system rather than the complete front end. Specialists may place it beside server-rendered templates, PHP, .NET, Java, WordPress or a newer JavaScript framework during a staged transition. Clear interfaces, small changes and reproducible tests make this approach safer for teams maintaining long-lived applications in Cologne and beyond.
Frequently asked questions
Key details about jQuery, drawn from the questions we get asked most.
jQuery is used to manipulate the browser DOM, respond to user actions, validate forms and load data without a full page refresh. It is especially useful for maintaining established websites, portals and server-rendered applications with interactive elements.
jQuery adds focused behavior to existing HTML and works well when a page does not need a component-based front end. React and Vue provide broader structures for complex interfaces, so the right choice depends on the application’s architecture, migration plans and existing team skills.
A strong jQuery specialist should understand JavaScript, HTML, CSS, browser debugging and REST APIs. Experience with JSON, accessibility, testing, content management systems and server-rendered applications is also valuable.
The required background depends on the task. A small interaction may need focused knowledge of jQuery, while a legacy migration or plugin replacement calls for someone who can trace dependencies, understand the surrounding application and plan safe incremental changes.
Yes. jQuery work is often suitable for remote collaboration when the repository, test environment and acceptance criteria are accessible. On-site sessions in Cologne can still help when specialists must inspect internal systems, coordinate with local teams or support a sensitive release.
Review whether jQuery code uses clear selectors, controlled event handling and sensible separation from presentation. Ask for examples of browser compatibility checks, accessibility decisions, error handling and tests around asynchronous behavior.
For a small enhancement to an existing site, jQuery can be a practical choice because it fits the current markup and avoids unnecessary restructuring. For a new, highly interactive application, teams should compare it with component-based options and consider long-term maintenance.
Before starting with jQuery, clarify the library version, browser support, plugin dependencies, build process and relationship to the server-side application. It is also important to identify whether the goal is maintenance, a staged modernization or a complete front-end replacement.
The average hourly rate of freelancers in Cologne, Germany who have used jQuery in their recent projects is 98 €, which corresponds to a daily rate of about 781 € based on an 8-hour working day.
Of the freelancers in Cologne, Germany who have used jQuery in their recent projects, 100% hold at least a Bachelor's degree, 71% hold at least a Master's degree, and 29% hold a doctorate.
On average, freelancers in Cologne, Germany who have used jQuery in their recent projects have 21 years of professional experience, with a single engagement typically lasting around 2.7 years.
The most common languages among freelancers in Cologne, Germany who have used jQuery in their recent projects are German (100%), English (100%), and French (21%).
The most common industries among freelancers in Cologne, Germany who have used jQuery in their recent projects are Information Technology (93%), Insurance (57%), and Retail (50%).
The most common business areas among freelancers in Cologne, Germany who have used jQuery in their recent projects are Information Technology (100%), Product Development (93%), and Quality Assurance (43%).
Main locations of FRATCH Experts, who have recently used jQuery
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 Dusseldorf Leipzig Dortmund Essen Bremen Dresden Hanover Nuremberg 
Berlin 
Hamburg 
Munich 
Frankfurt 
Dusseldorf Countries:
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