JSON Experts in Essen
in minutes from over 15,000 CVs with the power of AIHire experts who structure APIs, validate data contracts, and shape clean payloads with JSON and JavaScript Object Notation. They support integration work, config files, and event-driven systems, with fast, precise matching to vetted, available freelancers.
Meet FRATCH Experts in Essen, who have recently used JSON
Fadi S.
Last position:
Development of a production-ready Enterprise Document AI & Recommendation Platform at Freelancer
- Development of a production-ready Enterprise AI solution for the automated processing of invoices and business documents
- Integration of Azure AI Document Intelligence and LLM technologies into existing business processes
- Development of robust REST APIs for automated document processing and system integration
- Extraction, validation, and storage of structured invoice data in Azure SQL as a base for analytics and machine learning models
- Development of an AI-based recommendation engine with machine learning and deep learning to generate personalized product recommendations based on historical purchase data
- Implementation of logging, monitoring, error handling, and validation mechanisms for stable production use
- Collaboration with business teams to define business rules and integrate the solution into existing enterprise processes
Technologies: Python, Azure AI Document Intelligence, Azure OpenAI, Azure SQL Database, REST APIs, Machine Learning, Deep Learning, OCR, Pandas, JSON, Workflow Automation
Saruna M.
Last position:
Master's Thesis at Heinrich Heine Universität
- Title: Enhancing Syntactic Awareness in Transformer Language Models for Hindi Dependency Parsing
- Investigated syntactic knowledge captured by transformer language models (RoBERTa, XLM-RoBERTa) for Hindi dependency parsing, a morphologically rich and low-resource language.
- Developed structure-aware model variants (Struct_Roberta_hi, Struct_XLMR) by integrating a CNN-based parser network between transformer layers, inspired by the StructFormer architecture.
- Conducted extensive error analysis including label-wise, distance-based, direction-based, sentence length-based, and LVC/Non-LVC evaluations.
- Evaluated models on downstream NLP tasks (NER, POS tagging) using the IndicXTREME benchmark.
Manuel E.
Last position:
External Technical Lead for CI/CD, Architecture & Technical Governance at Insurance
- Technical lead for CI/CD modernization in the "Group Archive 4.0" system
- Architecture and steering responsibility according to the statement of work
- Setting up modern build and deployment processes
- CI/CD coaching and enablement of the internal development team
- Integration of modern DevOps, security, and compliance standards
- Ensuring technical governance, including collaboration with internal audit and BaFin
- Independently executing the modernization measures
- Supporting the team in adopting new technologies and methods
Mugisha E.
Last position:
Freelancer Business Data Analyst at Study Boundless
- Manage WordPress websites, ensuring SEO-friendly structures and high-performance functionality
- Create and optimize Google Ads campaigns, leveraging data to enhance conversion rates and ROI
- Develop Looker Studio & Power BI dashboards to track customer behavior, sales trends, and digital performance
- Implement Google Tag Manager (GTM) and Google Analytics (GA4) to enable precise event tracking and reporting
Andreas A.
Last position:
IT-Application Manager at IHK-GfI
- Gathering, analyzing, specifying, and prioritizing requirements for the 'Archive and Delete' module of the Chambers of Industry and Commerce in a Scrum team
- Capturing and specifying screen/form designs, functionality, and data types in Confluence, as well as creating user stories in Jira
- Preparing PowerPoint presentations for the 'Archive and Delete' module
- Coordinating and supporting the Chambers of Industry and Commerce in the implementation of the module
- Writing SQL scripts for an Oracle database
- Technologies used: Scrum, Confluence, Jira, MS Office, Postman, JavaScript, REST API, JSON, DBVisualizer, SQL
Loic N.
Last position:
Development of an app for managing Power Platform components at Hays GmbH
- Requirements analysis
- Provisioning of SharePoint sites and permissions
- Provisioning of SharePoint libraries and lists as data storage
- Development of the UI with Power Apps
- Development of automations with Power Automate to transfer data from Power Apps using Dataverse connectors
- Creation, customization, and management of Power Platform security roles
- Creation and management of Power Platform pipelines
- Development of UX design with Power Apps
Nils S.
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
Stefan W.
Last position:
Project team member at Environmental service provider
- Implementation and maintenance of an order management system
- RDBMS Oracle 19c
- Oracle Forms/Reports 12c/14c
- Oracle SQL
- XML processing
Discover over 15,000 top freelancers
Statistics of experts using JSON
Aggregated from the professional profiles of matched freelancers.
Experience
13 years (Germany: 19 years)
Position duration
1.5 years (Germany: 5.2 years)
Positions per freelancer
15 (Germany: 14)
Top business areas
Information Technology, Product Development, Business Intelligence
Top industries
Information Technology, Automotive, Construction
Certification focus areas
Information Technology, Product Development, Audit
Bachelor's degree or higher
100% (Germany: 89%)
Master's degree or higher
83% (Germany: 56%)
Certifications per freelancer
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 Essen 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 Essen 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 (88%)
- Automotive (50%)
- Construction (50%)
- Education (50%)
- Professional Services (50%)
- Government and Administration (50%)
- Retail (50%)
- Banking and Finance (38%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
What JSON does
JSON, short for JavaScript Object Notation, is a simple text format for structured data. Companies use it to move information between services, apps, and browsers. It is common in API responses, request bodies, configuration files, and event payloads.
Where it fits
- REST and GraphQL API payloads
- Microservice and system integration
- Web and mobile app data exchange
- Config files and environment-driven setup
- Event messages and webhook bodies
Skills that matter
Strong JSON specialists know how to design predictable structures, keep naming consistent, and avoid brittle nesting. They understand schemas, validation, escaping, encoding, and how JSON is consumed by JavaScript, backend services, and tooling. They also spot problems early when data contracts drift.
When companies hire
Teams bring in freelance expertise when integrations break, APIs change, or data needs a cleaner contract. They also do so for migrations from XML or ad hoc formats, and for projects that need better validation or documentation. In Essen, this is common in industrial, logistics, and enterprise software work.
Common tools
- OpenAPI and schema definitions
- JSON Schema validation
- Postman and API testing workflows
- jq and similar data inspection tools
- Logging and contract testing tools
What good experts deliver
Good JSON professionals write clear payloads that are easy to parse, extend, and test. They keep structures stable, document field meaning, and make edge cases explicit. The result is less rework for backend, frontend, and integration teams, whether they work on site in Essen or remotely.
Frequently asked questions
Need clarity? These are the questions we hear most often about JSON.
JSON is used to carry structured data between systems. Most companies use it for API requests and responses, configuration files, web app state, and event messages. It is popular because it is readable, lightweight, and easy for many tools to parse.
JSON is usually simpler and more compact than XML, which makes it a common choice for APIs and data exchange. Compared with YAML, it is stricter and safer for machine-to-machine communication. Teams often choose JSON when they want predictable structures and broad tool support.
You need JSON expertise when data contracts start causing bugs, integrations need cleanup, or payloads become hard to validate. It also helps when a team is moving from XML, fixing webhook issues, or standardizing API responses. A strong specialist can reduce friction across frontend, backend, and partner systems.
A strong JSON specialist usually works comfortably with REST APIs, OpenAPI, JSON Schema, and validation tools. Knowledge of JavaScript, Python, Java, or another backend stack helps because JSON lives inside real application flows. Experience with testing and contract design is also valuable.
A small JSON task may only need someone who can fix field names, nesting, or malformed payloads. Larger work, such as schema design or service integration, needs a specialist who understands data contracts and downstream systems. The right level depends on whether the issue is syntax, structure, or architecture.
Most JSON work can be done remotely because it centers on data structures, APIs, and documentation. On-site time in Essen can help when teams need to align on system boundaries, integration rules, or release planning. Many projects combine remote delivery with a few focused local sessions.
Look for clear, stable structures, valid examples, and an ability to explain trade-offs. Good JSON professionals think about naming, backward compatibility, validation, and how data will be consumed by other systems. They should also catch malformed edge cases before they reach production.
For many use cases, JSON is still the default choice because it is easy to read and widely supported. It works well for REST APIs, web apps, mobile clients, and event payloads. If a project needs stricter contracts or binary transport, other formats may be better.
The average hourly rate of freelancers in Essen, Germany who have used JSON in their recent projects is 65 €, which corresponds to a daily rate of about 517 € based on an 8-hour working day.
Of the freelancers in Essen, Germany who have used JSON in their recent projects, 100% hold at least a Bachelor's degree and 83% hold at least a Master's degree.
On average, freelancers in Essen, Germany who have used JSON in their recent projects have 13 years of professional experience, with a single engagement typically lasting around 1.5 years.
The most common languages among freelancers in Essen, Germany who have used JSON in their recent projects are German (100%), English (100%), and French (25%).
The most common industries among freelancers in Essen, Germany who have used JSON in their recent projects are Information Technology (88%), Automotive (50%), and Construction (50%).
The most common business areas among freelancers in Essen, Germany who have used JSON in their recent projects are Information Technology (100%), Product Development (88%), and Business Intelligence (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 
Dusseldorf 
Dortmund 
Nuremberg Request a free demo
Get in touch with the FRATCH team and we will get back to you within 4 hours.
Would you rather directly get in touch?
We always have the time for a call or email!
Philipp Thomaschewski
FRATCH CEO
