JSON Experts in Dortmund
in minutes with vetted, available specialistsHire experts who shape clean JSON data models, design API payloads, and build reliable integrations with JSON Schema, REST services, and configuration files. Get fast, precise matching with vetted, available freelancers.
Meet FRATCH Experts in Dortmund, who have recently used JSON
Arkadius S.
Last position:
AWS Pricing Platform / API & Integration Architecture at Porsche Digital
Development and evolutionary further development of a highly available, cloud-native microservice and integration architecture for dealer and retail processes in the Porsche Car Configurator.
Responsibilities
- Development of Java-/Kotlin-based backend, API, and integration components (Spring Boot)
- Integration of internal and external systems via REST/OpenAPI, GraphQL, Apache Kafka, and AWS SQS (synchronous and asynchronous)
- Implementation of stable, high-performance communication and data flows in a cloud-native platform architecture
- Processing of structured data formats (JSON, Protobuf, GraphQL schemas) based on existing API patterns
- Performance optimization of distributed microservices with reduced response times and higher operational stability
- Technical tests (unit, integration, and API tests) as well as error analysis in production-like environments
- AWS Infrastructure as Code with Terraform and AWS CDK
- CI/CD automation (build, test, and deployment pipelines) with GitHub Actions
- AI-supported feature implementation (GitHub Copilot Agent)
Label: Kotlin, Java 25, Spring Boot 4, Protobuf, TypeScript, AWS, Terraform, CDK, Apache Kafka, AWS SQS, REST/OpenAPI, GraphQL, JSON, PostgreSQL, Docker, GitHub Actions, Maven, Gradle, JUnit, Mockito, Testcontainers
Diego E.
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 U.
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.
Thomas G.
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 N.
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 A.
Last position:
Data Scientist & Energy Consultant at Accenture GmbH
Ilja L.
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
2.2 years (Germany: 5.2 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
Information Technology, Product Development, Project Management
Bachelor's degree or higher
83% (Germany: 89%)
Master's degree or higher
50% (Germany: 56%)
Doctorate
17% (Germany: 10%)
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 19 Sep 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 19 Sep 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
JSON 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 (86%)
- Healthcare (57%)
- Automotive (43%)
- Education (43%)
- Banking and Finance (43%)
- Manufacturing (43%)
- Telecommunication (43%)
- Energy (29%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
Core format
JSON, short for JavaScript Object Notation, is a simple text format for structured data. Teams use it to exchange information between services, store settings, and move data through APIs. It is human-readable, machine-friendly, and a common choice when systems need a clean contract.
Where it fits
- API request and response payloads
- Configuration files for apps and tools
- Event messages and queue payloads
- Data exchange between web, mobile, and backend systems
- Content structures for search, feeds, and product catalogs
Ecosystem and standards
Strong professionals working with JSON know the surrounding tools, not just the syntax. They work with JSON Schema, JSONPath, JSON Pointer, and formats such as JSON-LD when data needs validation, querying, or semantic context. In Dortmund, this often matters for teams that connect internal systems, portals, and industrial software.
When to bring in specialists
Companies bring in freelance expertise when payloads break, schemas drift, or integrations need a cleaner contract. They also look for help when migrating from ad hoc data files to well-defined JSON structures. A good specialist can spot invalid nesting, inconsistent naming, and brittle API assumptions early.
What strong professionals do
Strong JSON professionals write clear structures, keep naming consistent, and make data easy to validate. They understand how to keep payloads compact without making them hard to read. They also know when to pair JSON with schema rules, versioning, and documentation so teams can work safely across services.
Delivery and collaboration
Freelancers working with JSON often support API design, schema reviews, integration fixes, and data transformation work. They can collaborate remotely on most tasks, but on-site work in Dortmund can help when teams need close alignment with backend, frontend, and operations specialists. Clear examples and sample payloads make the work faster and safer.
Frequently asked questions
Key details about JSON, drawn from the questions we get asked most.
JSON is used to move structured data between systems, especially in APIs, web apps, and service integrations. It also appears in configuration files, message queues, and content feeds where a compact, readable format is useful. For many teams, it is the default way to describe data objects.
JSON is usually lighter and easier to read than XML, which makes it a common choice for modern APIs and app data. XML still has its place when document structure, mixed content, or legacy enterprise standards matter. A strong specialist can help choose the format that fits the system, not just the habit.
JSON is only the data format; it does not enforce rules by itself. If you need validation, required fields, type checks, or controlled changes over time, JSON Schema is often the next step. That is where many projects become more stable and easier to maintain.
A strong JSON specialist usually understands REST APIs, HTTP, JavaScript, and data validation. They often work with OpenAPI, JSON Schema, and backend or frontend code that creates or consumes payloads. For integration work, comfort with debugging and transformation tools matters as well.
JSON help is worth bringing in when integrations fail, data contracts are unclear, or a project needs a cleaner structure before launch. It is also useful when teams inherit messy payloads or need to standardize data across systems. A freelancer can often resolve these issues without long onboarding.
Yes, JSON work is usually well suited to remote collaboration because most tasks involve payloads, schemas, and sample data. For teams in Dortmund, on-site sessions can still help during workshops, discovery, or when multiple specialists need to align on a shared data model. The actual implementation is often handled online.
A strong JSON freelancer writes valid, predictable structures and explains why the shape of the data matters. Look for clear naming, careful schema thinking, and the ability to spot edge cases in nested objects and arrays. Good specialists also document examples that other teams can use without guesswork.
With JSON, common mistakes include inconsistent field names, deeply nested objects, and treating it like a full programming language. Teams also run into trouble when they skip validation or let API responses change without coordination. Good specialists prevent these problems by setting clear rules early.
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 688 € based on an 8-hour working day.
Of the freelancers in Dortmund, Germany who have used JSON in their recent projects, 83% hold at least a Bachelor's degree, 50% hold at least a Master's degree, and 17% 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 2.2 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.
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Frankfurt 
Stuttgart 
Dusseldorf 
Essen 
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