AJAX Experts in Dusseldorf
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Meet FRATCH Experts in Dusseldorf, who have recently used AJAX
Ramzi A.
Last position:
Full Stack Java Developer at ISO Public Services GmbH
- Contributed to the development of an advanced RAG AI Chat application that integrates multiple LLM models, enabling users to seamlessly switch between models based on specific tasks. This improved the user experience by providing tailored, efficient solutions for various use cases, such as event scheduling, booking systems, and complex task management.
- Participated in designing and implementing a robust backend architecture using Spring AI, enabling advanced AI-driven capabilities like intelligent task automation, language processing, and contextual recommendations. Leveraged Spring AI Tools and Advisors to enhance the performance and decision-making of the AI models.
- Collaborated on the integration of vector databases to support embeddings, enhancing the app's ability to understand user queries and perform actions based on complex, real-time data inputs.
- Contributed to the development of a seamless, user-friendly front-end interface using React with TypeScript support, ensuring a modern, responsive, and scalable user experience across platforms.
- Assisted in implementing state management with Redux RTK for efficient data flow and real-time updates, optimizing the overall user experience in dynamic scenarios such as scheduling and task management.
- Partnered with stakeholders to define feature requirements, helping ensure that the app could scale to meet evolving business needs and integrate with other systems like calendar and email services. Worked alongside cross-functional teams, including data scientists and UI/UX designers, to fine-tune AI models and ensure alignment with project goals.
- Contributed to ensuring end-to-end system performance, security, and compliance by helping integrate authentication mechanisms, role-based access control, and secure communication protocols in both backend and frontend layers.
Technology Stack and Key Contributions:
- Java / Spring Boot / Spring AI: Developed backend services leveraging Spring AI for intelligent responses, task automation, and complex workflows.
- React / TypeScript: Built intuitive user interfaces with React and TypeScript, ensuring a smooth and scalable frontend.
- Redux RTK: Managed application state with Redux RTK for optimized state management, enabling dynamic, real-time data updates.
- Vector Databases: Integrated vector databases (pgVector) for embedding support, improving AI model performance in handling complex queries.
- PostgreSQL / Redis: Managed persistent and temporary data with relational and in-memory data stores, ensuring data integrity and speed.
- Kafka: Utilized Apache Kafka for event-driven communication and seamless integration between microservices.
- Spring Security: Ensured the security of backend services with robust authentication and authorization mechanisms.
- CI/CD & DevOps: Integrated continuous integration and deployment pipelines to ensure rapid and secure deployment of features and updates.
Andreas G.
Last position:
Senior Fullstack .NET (Core) & Angular Developer at IT Service Provider
- Supporting several agile teams in the new product development of an enterprise CRM and ERP application
- Web frontend development with Angular 17–21 (microfrontends, Domain-Driven Design, MDB-Bootstrap)
- Backend development with C# and .NET 7–10, MongoDB, MassTransit, RabbitMQ, Entity Framework Core, ElasticSearch (microservices, DDD)
- Technical feature design for assigned tasks
- Technical architecture design including forward-looking planning of AI-supported extension options
- Proof-of-concept implementation of AI-supported workflows with n8n and a locally hosted LLM (Ollama)
- Coordination with stakeholders and Product Owners, support with sprint planning
Result: Delivery of production-ready microservices and frontend modules in agile sprint cycles.
Environment: .NET 7–10 · Angular 17–21 · C# · TypeScript · OpenAPI · Microfrontends · DDD · Kubernetes · Docker · Helm · MS SQL Server · PostgreSQL · MongoDB · MassTransit · RabbitMQ · EF Core · ElasticSearch · Kibana · Azure DevOps · KeyCloak · n8n · Ollama
Younes H.
Last position:
Senior Backend Developer at PTA
- Development and maintenance of database-driven applications for managing supplier and food contracts, with extensive use of Oracle PL/SQL for complex business logic and data processing
- Optimization of PL/SQL procedures, functions, and triggers to ensure the performance and scalability of Oracle database solutions
- Ensuring compliance with best practices in PL/SQL development and implementing standards for code quality and data integrity
- Close collaboration with backend and frontend teams to ensure smooth integration between the Oracle database, C#-based APIs, and Azure cloud services
Gernot L.
Last position:
Founder and Managing Director at Softwerk/Ruhr GmbH
- Architecting and developing SaaS platform for graphical definition and execution of pandas data processing pipelines
- Developed POlyglott, an open-source Python CLI tool for translation workflow management featuring PO file parsing, quality linting with glossary enforcement, and DeepL API integration for machine translation
- Developed web application for material compliance management (EU REACH) using Django and modern web technologies
- Built automated infrastructure platform using Proxmox, Terraform, and Ansible — VM provisioning, configuration management, internal DNS, and fleet-wide security hardening across multiple subnets
Dalia C.
Last position:
Oracle Developer at Freelance
- Design and implementation of an OCI-based data warehouse and ETL system to replace legacy mainframe applications
- Developed a database optimization strategy and planned the rapid conversion of JCL and COBOL routines to PL/SQL using AI
- Developed an Oracle Apex-based app for internal administrative processes in the public sector (office equipment, staff training)
- Implemented PL/SQL workflows for approval processes and created a responsive mobile version with JavaScript and CSS
- Used Azure DevOps for backlog management and documentation, and Git for version control
- Developed REST interfaces to CRM systems
- Replaced and reprogrammed Oracle Forms screens with Oracle Apex and updated to the latest Apex versions
- Designed a Git branching strategy and conducted code reviews
- Maintained and further developed an EDI-based data exchange system based on Oracle Advanced Queuing for the public sector in Austria
- Performed data analysis and created charts in the Oracle Apex frontend; installed standalone ORDS and Apex 23.1
- Worked agile using the Spotify model; developed complex Apex pages with support from Oracle JET
- Rebuilt and customized existing PL/SQL packages, created workarounds for database version differences, and optimized queries
- Developed Apex applications for broker pools to manage and optimize Oracle databases in the banking environment, including SSO-based authorization systems with OAuth2 and Keycloak
- Built extensive Oracle Apex applications for BI and data mining modernization projects and developed manual and automated projection methods in the frontend
- Carried out data warehousing projects in the banking sector and used Scrum and Kanban in team projects
Karan S.
Last position:
Senior Software Engineer at Infosys Ltd
- Forecasting Cost Tool (PCCT) imports data via SSIS from CSV files and processes modules for administrator, user management, train operations, and fleet operations.
- Conducted requirement analysis and effort estimation.
- Designed database and developed web pages.
- Tested the application.
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 AJAX
Aggregated from the professional profiles of matched freelancers.
Experience
22 years (Germany: 23 years)
Position duration
2.4 years (Germany: 2.6 years)
Positions per freelancer
11 (Germany: 16)
Top business areas
Information Technology, Product Development, Business Intelligence
Top industries
Information Technology, Government and Administration, Banking and Finance
Certification focus areas
Information Technology, Project Management, Operations
Bachelor's degree or higher
100% (Germany: 85%)
Master's degree or higher
80% (Germany: 53%)
Doctorate
20% (Germany: 7%)
Certifications per freelancer
4 (Germany: 2)
Most common languages
German, English, French
Speak two or more languages
100% (Germany: 98%)
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 Dusseldorf 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 Dusseldorf using AJAX
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.
AJAX 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%)
- Government and Administration (71%)
- Banking and Finance (43%)
- Manufacturing (43%)
- Retail (43%)
- Telecommunication (43%)
- Education (29%)
- Energy (29%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
What AJAX does
AJAX lets a page send and receive data in the background. That keeps interfaces fast and avoids full reloads. It is used for search suggestions, live filters, in-place edits, dashboards, and other browser flows that need quick updates.
Common patterns
- Load data from REST or JSON endpoints
- Update page sections without refreshing the browser
- Handle forms, validation, and autosave actions
- Power live search, infinite scroll, and status updates
It often appears in products that still use jQuery, but it also works with plain JavaScript and modern APIs such as fetch.
Ecosystem and skills
Strong AJAX professionals know how browser requests, headers, cookies, and cross-origin rules affect behavior. They also work with JSON, HTTP status codes, and error handling. In many projects they connect front-end code to backend services, content systems, or older applications that need careful incremental changes.
When to bring in help
Companies usually bring in freelance expertise when a UI feels slow, a legacy page needs modernization, or request handling is hard to maintain. In Dusseldorf, this often comes up in commerce, media, logistics, and internal business tools where teams need smooth interaction without replacing the whole application.
What strong experts deliver
- Clean request logic with clear success and failure states
- Minimal, maintainable code that fits the existing stack
- Careful handling of loading states, retries, and edge cases
- Better user flow across desktop and mobile browsers
Good specialists test behavior in real browsers and check how the UI reacts under slow or unreliable connections.
Working with the right specialist
AJAX work is rarely just about sending a request. It also needs good structure, readable state handling, and attention to security and performance. The best freelancers document the behavior clearly, so future specialists can extend it without guesswork.
Frequently asked questions
What clients ask us most about AJAX — answered in short.
AJAX is used to exchange data with a server while the page stays open. It powers features like live search, filters, inline form saves, notifications, and dashboard updates. That makes the interface feel quicker and more interactive.
Yes, AJAX is still relevant because the pattern is bigger than any one API. Many teams now use fetch or framework tools to implement the same background request flow. The term still matters when a site has jQuery code, older front-end logic, or legacy integrations.
AJAX is the interaction pattern: send a request in the background and update part of the page. jQuery is one way to implement it, and fetch is a modern browser API often used for the same task. A good specialist knows the pattern, not just one library.
A strong AJAX specialist usually understands JavaScript, HTML, CSS, and HTTP basics. JSON handling, API design, error states, and cross-origin issues are also important. In many projects, experience with jQuery or a front-end framework helps too.
AJAX work can be simple or tricky depending on the state model and the backend. A small form update may need only a focused specialist, while legacy code, caching, security, or heavy UI logic needs someone who has handled edge cases before. The real test is whether the expert can keep behavior stable.
For AJAX projects, remote work is often enough because most tasks live in code and browser testing. On-site time can help when the team is untangling old application behavior or aligning front-end and backend changes quickly. In Dusseldorf, many companies mix both depending on team setup and codebase complexity.
Look for clear request flow, solid error handling, and code that fits your existing stack instead of adding unnecessary complexity. A good AJAX professional explains loading states, retries, and browser differences in plain language. They should also be able to test the feature in realistic conditions, not just in a happy-path demo.
Teams usually ask for AJAX help when a page reloads too much, a form is hard to use, or old code has become fragile. Slow response handling, duplicate requests, and messy UI updates are also common triggers. A specialist can often improve the experience without a full rebuild.
The average hourly rate of freelancers in Dusseldorf, Germany who have used AJAX in their recent projects is 93 €, which corresponds to a daily rate of about 744 € based on an 8-hour working day.
Of the freelancers in Dusseldorf, Germany who have used AJAX in their recent projects, 100% hold at least a Bachelor's degree, 80% hold at least a Master's degree, and 20% hold a doctorate.
On average, freelancers in Dusseldorf, Germany who have used AJAX in their recent projects have 22 years of professional experience, with a single engagement typically lasting around 2.4 years.
The most common languages among freelancers in Dusseldorf, Germany who have used AJAX in their recent projects are German (100%), English (100%), and French (29%).
The most common industries among freelancers in Dusseldorf, Germany who have used AJAX in their recent projects are Information Technology (100%), Government and Administration (71%), and Banking and Finance (43%).
The most common business areas among freelancers in Dusseldorf, Germany who have used AJAX in their recent projects are Information Technology (100%), Product Development (100%), and Business Intelligence (71%).
Main locations of FRATCH Experts, who have recently used AJAX
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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Munich 
Frankfurt Request a free demo
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Philipp Thomaschewski
FRATCH CEO
