JSON Experts in Dusseldorf
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Meet FRATCH Experts in Dusseldorf, who have recently used JSON
Lutz Engelland
Last position:
Freelance Software Developer – GoPro MultiCam Control via COHN at Plutos Company UG
- Development of a pilot system to control and monitor multiple GoPro cameras
- Implementation of start, stop, status, media, download, and diagnostic functions via COHN endpoints
- Realization of camera detection, single and group control, as well as stable session/keep-alive logic
- Setup of a download pipeline with queue, retry handling, and temporary files
- Consistent session, folder, and file naming for multi-camera recordings
- Integration of provisioning, certificates, and network operations
Stanislaus Stelle
Last position:
Security Consultant at Rohde & Schwarz AG at Star Labs GmbH
- Worked on FPGA enhanced network encryption device with secure boot, TPM2.0 and smart card integration for BSI approved usage with Post Quantum Cryptography
- Developed and audited Linux drivers
- Collaborated using GitLab, Gerrit, Confluence and Jira
- Technologies: C, C++, Secure Boot
Alexander Rautzenberg
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
Sebastian Chece
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
Anouar Taoussi
Last position:
Fullstack Developer Java/Spring Boot at Snipes SE (Deichmann Group)
- Migration of a .NET Core loyalty program for Snipes, used by mobile cash registers in Snipes stores
- Part of the customer’s digitalization strategy in an agile, cross-functional team with a high level of ownership
- Connecting interfaces to third-party systems (e.g. Brandung, CDS)
- Quality assurance through automated tests
- Carrying out developer, unit, and integration tests
- Patterns & methods used: Clean Code, microservice architecture, agile development with SCRUM
- Technologies & tools used: Spring Boot, Java 23, Java Persistence API (JPA), Azure DevOps, Azure Key Vault, Azure PostgreSQL, Docker & Kubernetes, Git, Graylog, Grafana, JUnit, SonarQube, Jira, Confluence, Prometheus, GitLab, GitLab CI/CD, Visual Studio Code
Nils Schneider
Last position:
Backend system and web client for exchanging electricity meters for utility providers at Freelance
Design and implementation of a system to control the entire process for new, removal, and exchange operations of electricity meters by external service providers for a utility company
Automated retrieval of orders and available devices via defined interfaces (e.g. from SAP)
Orchestration of process steps (assigning meters, processing meter data, sending updated information back to the source system) using a Spring Boot backend
Provision of a React-based web client for operational tracking and control of orders, e.g. to continue failed process steps or resend notifications
Jürgen Von Agris
Last position:
Instructor / Trainer at SAP Training Company
- Instructor / Trainer
- SAP applications in SAP S/4 HANA - Sales, Sourcing Procurement, Logistic Execution, SAP Foundation
- SAP S/4 HANA - Fiori UX and Fiori Launchpad
- Cross-module MM application - Sourcing & Procurement
- Business processes SAP S/4 HANA Procurement
- Purchasing processes SAP S/4 HANA MM
- Incoming processes SAP S/4 HANA MM
- Supplier invoicing SAP S/4 HANA MM
- Pricing & plant determination SAP S/4 HANA MM
- Automation in SAP S/4 HANA MM
- Business processes SAP S/4 HANA Pre & After Sales
- Sales processes SAP S/4 HANA Sales
- Delivery processes SAP S/4 HANA Sales
- Billing SAP S/4 HANA Sales
- Pricing SAP S/4 HANA Sales and Storage Rooms and Lean-EWM
- Automation in SAP S/4 HANA Sales
- SAP S/4 HANA – SAP Private Cloud – Release 2023
Peter Hiebl
Last position:
Product Owner / Senior Business Analyst at Freelance management consultant
- Analysis of the possibility of extracting market location data into a separate microservice within an overarching web portal
- Developing a more user-friendly target process based on the current process in coordination with the users
- Coordinating the related architecture concept with architects and developers
- Aligning the related epics and user stories with the relevant departments
- Backlog prioritization and project planning (incl. effort estimation)
- Testing and accepting the implemented user stories
- Technologies/Tools used: MS Office, Jira, Mural, Kotlin, React, GitHub, MS Azure, SQL, Postman, XML, JSON, Kafka, Balsamiq, BPMN
Discover over 15,000 top freelancers
Statistics of experts using JSON
Aggregated from the professional profiles of matched freelancers.
Experience
20 years (Germany: 19 years)
Position duration
1.3 years (Germany: 1.9 years)
Positions per freelancer
17 (Germany: 14)
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Banking and Finance, Manufacturing
Certification focus areas
Information Technology, Product Development, Finance
Bachelor's degree or higher
100% (Germany: 88%)
Master's degree or higher
80% (Germany: 56%)
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 30 Aug 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 JSON
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
What JSON is
JSON, short for JavaScript Object Notation, is a lightweight text format for structured data. Companies use it to move information between services, front ends, mobile apps, and automation tools. It is easy to read, but small mistakes can break whole data flows.
Where it is used
- API requests and responses
- Configuration files and app settings
- Event payloads in integrations and queues
- Data exports, imports, and sync jobs
- Logs and payload inspection
Skills that matter
Strong specialists know JSON syntax, nesting, arrays, escaping, and schema validation. They also understand how JSON works with REST APIs, OpenAPI, JSON Schema, and common tooling for testing and debugging. Good work keeps data clean, predictable, and safe to process.
Why companies bring help
Teams often need freelance support when integrations fail, payloads change, or a project needs a new data contract. The right expert can review API structures, repair malformed data, document field rules, and align backend and front-end expectations. In Dusseldorf, this is common in commerce, logistics, media, and enterprise software work.
What strong experts deliver
A good JSON professional does more than format files. They spot broken nesting, missing types, inconsistent naming, and fragile contracts before those issues reach production. They also write clear examples that help other specialists use the data correctly.
Working methods
Remote collaboration usually fits JSON work well because most tasks live in code, specs, and test files. On-site work can help when teams need to map legacy systems, review domain models, or clean up shared data structures together. In both cases, clear documentation and exact communication matter more than broad theory.
Frequently asked questions
Need clarity? These are the questions we hear most often about JSON.
A strong JSON specialist designs, reviews, and repairs structured data that moves between systems. That can mean API payloads, configuration files, event messages, or schema rules. The goal is simple: make data easy to exchange and hard to break.
Bring in JSON help when integrations are unstable, a new API is being introduced, or multiple teams disagree on data shape. It is also useful when legacy payloads need cleanup or validation rules are missing. A freelancer can move quickly without needing long onboarding.
JSON is usually the first choice for web APIs and machine-to-machine exchange because it is compact and widely supported. XML is heavier and often used in older enterprise systems, while YAML is common for human-edited configuration. The right choice depends on the system, but JSON remains the default for many integrations.
A good JSON expert usually understands REST APIs, schema validation, versioning, and debugging tools. Experience with OpenAPI, JavaScript, TypeScript, Python, or backend services helps a lot because JSON often sits inside those workflows. Clear documentation skills matter too.
Simple JSON tasks can be handled by specialists who know the format well and have worked with APIs or configuration before. More complex work needs someone who can design contracts, handle nested structures, and protect backward compatibility. If the project touches many systems, senior judgment becomes important.
Most JSON work can be done remotely because the key artifacts are files, schemas, and test cases. On-site sessions can help when teams need to review business rules, untangle legacy data, or align several stakeholders quickly. Many companies in Dusseldorf use a mix of both.
Look for clean structures, consistent naming, valid syntax, and examples that are easy to test. A reliable JSON professional also explains assumptions, flags edge cases, and keeps contracts stable across versions. Good work reduces bugs instead of just passing validation.
Common issues include malformed syntax, inconsistent field names, missing null handling, and arrays that change shape without warning. JSON also causes trouble when teams add fields without coordinating schema changes. Strong specialists prevent those problems with validation, review, and clear contract design.
The average hourly rate of freelancers in Dusseldorf, Germany who have used JSON in their recent projects is 105 €, which corresponds to a daily rate of about 844 € based on an 8-hour working day.
Of the freelancers in Dusseldorf, Germany who have used JSON in their recent projects, 100% hold at least a Bachelor's degree and 80% hold at least a Master's degree.
On average, freelancers in Dusseldorf, Germany who have used JSON in their recent projects have 20 years of professional experience, with a single engagement typically lasting around 1.3 years.
The most common languages among freelancers in Dusseldorf, Germany who have used JSON in their recent projects are German (100%), English (100%), and French (25%).
The most common industries among freelancers in Dusseldorf, Germany who have used JSON in their recent projects are Information Technology (100%), Banking and Finance (75%), and Manufacturing (63%).
The most common business areas among freelancers in Dusseldorf, Germany who have used JSON in their recent projects are Information Technology (100%), Product Development (100%), and Quality Assurance (75%).
Main locations of FRATCH Experts, who have recently used JSON
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 
Dortmund 
Essen 
Nuremberg Request a free demo
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Philipp Thomaschewski
FRATCH CEO
