JSON Expert in Dortmund
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Meet FRATCH Experts in Dortmund, who have recently used JSON
Diego Espinoza
Last position:
RPG Software Developer from RPG III to Free Format
- Development of software and system support for RPG development.
- Development, optimization and maintenance of programs in RPG (RPG II to ILE Free Format).
- Performing integration tasks, data management as well as applying and managing system updates.
- User support and training to ensure smooth system operation.
Adnan Urwani
Last position:
Independent AI & Automation Projects
- Development of an automated job-scouting workflow for the aggregation and LLM-based evaluation of job postings from RSS feeds and APIs.
- Development of a Telegram bot for voice and text messages, featuring LLM-supported processing, summarization, and structured JSON output.
- Implementation of a personal task-planning assistant using n8n, OpenRouter, and Supabase for automated daily and knowledge organization.
- Development of LLM chatbots for structured knowledge retrieval utilizing prompt constraints, guardrails, and forced output formats.
Arkadius Sikora
Last position:
Architect; Senior Developer; Full Stack Developer; DevOps Lead at Bitmarck Holding GmbH
- Requirement engineering for Ombudsstelle and creation of technical user stories for EPA V3
- Handling of objections and revocations via mail and letter with high transaction mail volume
- Coordination with other teams on interfaces
- Design of a highly available, high-throughput solution on OpenShift with Java backend microservices
- Implementation and extension of microservices
- Infrastructure setup for deployment on OpenShift/Kubernetes including Jenkins pipelines
- Integration with BitIAM, TI-M Fachdienst, Consent Keeper and FDV
- Capture of requirements from DevOps operations and business units
- Continuous integration and Scrum practices
- Use cases: Kassenfusion, Opt-Out, Last Test, Widerspruchsmanagement
- Integration test automation and feature extensions including Spring Boot 3 updates
Thomas Grevenkamp
Last position:
Senior .NET / Cloud Engineer at Freelance
Building an observability and alerting solution for Business Central Job Queue monitoring
- Built a central monitoring solution to track the Business Central Job Queue in a multi-organization environment in Azure DevOps
- Integrated Azure Application Insights and Log Analytics for structured collection and analysis of job runtimes and error events
- Developed KQL queries for targeted analysis of failed jobs and detection of error patterns
- Connected Grafana and Power BI to visualize operational metrics and job status in real time
- Implemented an automated alerting workflow with Power Automate – when a job fails, a notification email is sent immediately
- Ensured transparency about the state of productive background processes during live operations
Result: Full transparency over failed Business Central jobs · Clear reduction in response time through automated email alerting · Stable foundation for proactive operation of productive background processes
Technologies: Azure DevOps | Application Insights | Log Analytics | KQL | Grafana | Power Automate | Power BI | Business Central | Azure Monitor
Yoav Netzer
Last position:
Freelance Software Architect at Freelance Consultant
- Various small consultations, e.g. concepts and arcitectures.
- Updating my Matlab, Linux, IPv6, Cyber-Security, C++ (up to 23) and Python skills.
Mohammed Abdallatif
Last position:
Data Scientist & Energy Consultant at Accenture GmbH
Ilja Leyberman
Last position:
Software Engineer/Architect (Tech Lead) at Mercedes-Benz Tech Innovation GmbH
- Implementation of various interfaces for subsystems and connection to external devices (cameras, scanners, digital lockers)
- Development of various interfaces in the used cars area
- Realization of various prototypes
- Support in UI/UX and data analytics
- Development of frontend and backend solutions
- Kubernetes migration
- Building CI/CD pipelines
- Communication with the business unit and technical design of new solutions
- Cross-team alignment and coordination within the team
- Overview of the entire technology stack and related systems
- Documentation, preparation, and conducting of reviews
- Supporting the team and coordinating releases and key milestones
Discover over 15,000 top freelancers
Statistics of experts using JSON
Aggregated from the professional profiles of matched freelancers.
Experience
19 years
Position duration
2.1 years (Germany: 1.9 years)
Positions per freelancer
12 (Germany: 14)
Top business areas
Information Technology, Product Development, Business Intelligence
Top industries
Information Technology, Healthcare, Automotive
Certification focus areas
Product Development, Information Technology, Project Management
Bachelor's degree or higher
80% (Germany: 88%)
Master's degree or higher
40% (Germany: 56%)
Doctorate
20% (Germany: 11%)
Certifications per freelancer
2
Most common languages
German, English, Arabic
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 Dortmund 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 Dortmund 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
The Standard for Modern Data Exchange
JavaScript Object Notation has become the universal format for transmitting data in web applications and distributed systems. Its lightweight, human-readable structure makes it the preferred choice over older formats like XML. Freelance specialists utilize this format to ensure fast, reliable communication between front-end interfaces and back-end services.
Key Use Cases in Technical Systems
- Designing clean payloads for RESTful and GraphQL APIs
- Configuring modern software tools and build pipelines
- Storing semi-structured data in document-oriented databases
- Facilitating asynchronous message queues in microservices
The Tooling and Ecosystem
Working with this format involves more than writing raw data structures. Experts leverage tools like JSON Schema for validation, parsing libraries across various languages, and command-line processors like jq to manipulate data. They ensure that data structures remain consistent, backward-compatible, and optimized for network transmission.
Local Integration in Dortmund Industries
Dortmund has evolved into a key technology hub in North Rhine-Westphalia, with strong logistics, insurance, and IT service sectors. Companies in the region frequently require specialists to connect legacy ERP databases with modern web platforms. Local professionals ensure compliance with European data standards while facilitating smooth data flows across regional supply chains.
Signs Your Project Requires Specialized Expertise
- APIs suffer from slow response times due to bloated data payloads
- System integrations frequently fail because of validation errors
- Team members struggle to manage deep, overly complex data structures
- Mobile applications consume excessive bandwidth during data syncs
Defining Excellence in Data Modeling
The best professionals possess deep knowledge of data serialization, nesting strategies, and security best practices to prevent injection attacks. They understand how different backend languages interpret data types during parsing. This technical precision prevents runtime exceptions and guarantees that systems scale efficiently under heavy traffic.
Frequently asked questions
Key details about JSON, drawn from the questions we get asked most.
Specialists design, validate, and optimize JSON structures to facilitate seamless data interchange between servers and web applications. They write schemas to enforce data integrity and configure serialization processes to ensure high system performance.
While XML supports complex document structures, JSON is significantly lighter, easier for humans to read, and native to JavaScript. This makes it the faster and more efficient choice for modern web APIs and microservices.
Experienced professionals frequently use JSON Schema for structure validation, command-line utilities like jq for data manipulation, and various language-specific parsers. They also utilize API testing tools to verify payload structures.
Hiring a local JSON specialist in Dortmund ensures smooth collaboration during core working hours and facilitates occasional on-site workshops. Local experts also understand the regional IT landscape, helping integrate your systems with established regional partners.
Security professionals prevent vulnerabilities by ensuring that JSON payloads are strictly validated before parsing. They implement secure parser configurations to avoid injection attacks and preserve system stability.
Yes, freelance JSON specialists routinely work in fully remote environments. They utilize digital collaboration tools and version control systems to integrate data models seamlessly into your existing development pipeline.
Most specialists working with JSON in Germany are fluent in English, which is the standard language for technical documentation. Depending on your team dynamics, many local professionals also offer fluent German to ease integration.
You can evaluate a specialist by reviewing their approach to schema design and API documentation. A high-quality JSON payload is minimalist, avoids redundant nesting, and is accompanied by clear validation schemas.
The average hourly rate of freelancers in Dortmund, Germany who have used JSON in their recent projects is 86 €, which corresponds to a daily rate of about 687 € based on an 8-hour working day.
Of the freelancers in Dortmund, Germany who have used JSON in their recent projects, 80% hold at least a Bachelor's degree, 40% hold at least a Master's degree, and 20% hold a doctorate.
On average, freelancers in Dortmund, Germany who have used JSON in their recent projects have 19 years of professional experience, with a single engagement typically lasting around 2.1 years.
The most common languages among freelancers in Dortmund, Germany who have used JSON in their recent projects are German (100%), English (100%), and Arabic (14%).
The most common industries among freelancers in Dortmund, Germany who have used JSON in their recent projects are Information Technology (86%), Healthcare (57%), and Automotive (43%).
The most common business areas among freelancers in Dortmund, Germany who have used JSON in their recent projects are Information Technology (86%), Product Development (71%), and Business Intelligence (43%).
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 
Dusseldorf 
Essen 
Nuremberg Request a free demo
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