JSON Expert in Austria
with fast, precise AI matchingHire experts who design reliable JSON schemas, connect REST APIs, transform nested data and validate payloads across web and enterprise systems. FRATCH matches you quickly and precisely with vetted, available freelancers who fit your project.
Meet FRATCH Experts in Austria, who have recently used JSON
Thomas P.
Last position:
Change Manager / AI-driven Finance Transformation at Agrana
Organizational Change Management for the strategic setup of a hybrid GBS rollout as part of a global, AI-driven Finance Transformation. End-to-end management of the OCM architecture in a highly complex on-, near-, and offshore partner setup [IN, PL, RO]. Successful completion of Phase 1 (Initial Strategy) and strategic pausing by the Executive Board after the early disclosure of critical vendor-side OPEX risks
Systemic Baseline Assessment & Stakeholder Diagnostics: Evaluation of the global organization and analysis of the process landscape across 21 countries [AT, DE, CH, FR, UK, SI, RO, UA, RU, US, CD, CN, AR, MX, ZA, IN, JP] to precisely determine change requirements
Architecting the OCM Strategy & Master Roadmap: Independent development of a comprehensive, AI-centered Change Roadmap for end-to-end management of all change initiatives across every project phase
Data Quality & AI Agent Risk Mitigation: Auditing of Process Data Repositories (Celonis analysis); prevention of the ingestion of 58% synthetic training data to safeguard AI model reliability amid geopolitical supply chain tensions
GBS Vendor BAFO Triage & Contractual Commitment: Critical review of Tier-1 vendor pitches and contractual commitment to a reduced Non-STP rate (from 7% to 4%) to avoid extreme manual rework with a planned FTE reduction (-63%)
Executive Enablement & Board Alignment: Design of the GBS Transformation Executive Board Deck to strategically enable C-level executives and transparently present completely overlooked AI tokenization costs
Targeted Change Communications & Engagement: Design and development of audience-specific communication measures to align the highly diverse, globally distributed stakeholder network
Adoption Velocity & Resistance Measurement: Engineering of quantitative measurement tools (Pulse Check Survey) using Behavioral Dyads to identify resistance based on data and ensure sustainable success measurement
Results:
- Avoidance of disruptive misallocations: Stopping the ingestion of 58% synthetic AI-agent training data after discovering only 42% compatibility with existing processes, preventing critical GBS cascade errors
- Significant OPEX & effort reduction: Reduction of the Non-STP rate in Tier-1 vendor BAFOs from 7% to 4% alongside an impending 63% Finance-FTE reduction; avoidance of thousands of time-consuming manual correction processes
- 100% Delivery of the OCM architecture & ROI protection: Delivery of all OCM artifacts (Change Roadmap, Comms Plan, Executive Board Deck, Pulse Check Survey) and protection of ROI by identifying incalculable LLM runtime token costs
Matthias K.
Last position:
Requirements Engineer & Business Analyst at Media Company
Analysis of existing work, information and decision-making processes.
Identification and prioritization of suitable use cases for AI agents.
Elicitation of functional and non-functional requirements.
Design of collaboration between users and AI agents, including control and escalation mechanisms.
Support for the implementation of the AI agents and adapted keyboard hardware.
Business target vision for the AI-first transformation.
Structured and prioritized requirements for implementation.
Defined roles, interactions and control points between people and AI agents.
Preparation for the gradual automation of productive work processes.
Techstack: AI agents, LLMs, agent orchestration, RAG, APIs, automation, hardware
Roman M.
Last position:
Software Engineer at FSM Rechtsanwälte
- Develop AWS-based components connecting Python backend services to React/TypeScript frontends.
- Improve database queries and application workflows for document processing and screening.
- Evaluate LLM retrieval and document-review workflows as part of the product stack.
Vladislav F.
Last position:
Senior Test Automation Engineer / Test Manager at Stadt Wien – WUKSEA
- Creation of test scenarios, manual test cases and test data using boundary value analysis and equivalence partitioning
- Execution of functional and non-functional tests (manual with Postman and web application, automated with WebDriver, JUnit and NUnit)
- Setup, automation and maintenance of the Test Automation Framework with Java, Spring Boot, Selenium and Cucumber in IntelliJ (system, regression, smoke, UI and integration tests for web frontend and SOAP API backend interfaces)
- Automation of backend NUnit test cases in Visual Studio
- Test management: development and implementation of the test strategy and test plans, test coordination, quality responsibility and prioritization of risk-based tests, as well as documentation management in Confluence
- Detailed analysis and quality assurance of requirements
- Creation and maintenance of Jenkins pipelines, quality assurance during build & deployment
- Close cooperation with business analysts, developers, testers and test management
- Identification, creation and tracking of errors/defects, as well as careful test documentation
- Reporting of test results and defect reports
- Monitoring of test processes and continuous improvement
- Verification of test data and test results in a PostgreSQL database in pgAdmin
- Support with effort estimates and backlog prioritization
- Analysis and debugging of development code
System environment: Java, JUnit, Spring Boot, Selenium, Cucumber, JavaScript, Jenkins, C#, NUnit, Postman, Bitbucket, Confluence, Jira, xRay, pgAdmin, PostgreSQL, SonarQube, Maven, IntelliJ, Visual Studio, CI/CD, SOAP API interfaces
Michael G.
Last position:
Scrummaster at Xenovo
Planning and monitoring sprints and holding the scheduled meetings
Analyzing and resolving issues in the development process
Error analysis, bug management and correction in individual process steps
Stakeholder management
Documentation and improvement of the development process
Tools: JIRA, Confluence
Mubin I.
Last position:
Software Engineer, Freelancer at Siemens-Linz
- Designed and implemented simulation software for electrical power systems, focusing on dynamic element interaction and user interface optimization using C++, wxWidgets, Windows, and Visual Studio.
Namik D.
Last position:
Test Manager / Test Automation Engineer at Sky Deutschland GmbH
- Implemented and maintained 443 automated test cases with a 99% pass rate (441/443)
- Enabled CI for test automation: automated runs on review/merge, reporting via Xray
- Introduced accessibility and performance checks and established them in reporting
- Served as QA lead in daily operations with stand-ups, Kanban progress tracking, prioritization, and targeted task distribution
- Handled defect triage and stakeholder communication with daily triage, QA status analysis, and actionable recommendations
- Developed and maintained a stable regression suite for CRM/Salesforce flows (UI/E2E and near-API validations)
- Integrated CI/CD using Jenkins pipelines with Groovy (IaC)
- Maintained QA documentation, test conventions, and processes in Confluence, aligned across the team
- Conducted Salesforce Einstein chatbot testing with intent/topic validation and output checks, and used Robot Framework/Python suites for continuous quality monitoring
- Technology stack: Jira, Xray, Confluence, Jenkins, Groovy, Git, Java, Selenium, Playwright, Cucumber, TypeScript, Postman, REST, Salesforce, Google Cloud, Lighthouse, Evinced, Scrum/Kanban, BDD (Gherkin)
Ben R.
Last position:
Senior iOS Developer at tado° App
- Foundational work for new hardware series “tado° line X”
- Interview & onboard new iOS Engineers
- Reduce release time from 1 in 2 months to 1 per week
- Maintain and improve high user satisfaction: 4.6+ Stars
- Setup secure & encrypted Handshake with bluetooth device
- Reduce merge conflicts by setting up the project via tuist
- Convert monolithic codebase to Modules by leveraging SPM
- Use state of the art technology, like Codable & async/await
- Maintain & improve custom view accessibility
- Reduce tech debt
- Gradually convert to webviews while maintaining high quality
- Ship highly requested features like “dark mode”
- Increase unit test code coverage and rewrite parts of code base
Michael L.
Last position:
Software Developer at ProjektPro GmbH
- Optimized the performance of a large FileMaker solution
- Optimized performance in cloud and on-premise solutions
- Optimized the REST API
- Bug fixing and documentation
- Part of a large Scrum team
Jaroslav A.
Last position:
Child care, personal development and learning
Alexander T.
Last position:
Functional Analyst & Administrator at Netz Niederösterreich GmbH
- Introduced automated testing for Fabasoft components and trained testers to create automated test cases.
- Installed AppTest on the server and clients.
- Requested firewall exceptions to allow communication between the AppTest server and clients.
- Conducted training sessions for testers.
- Automated test workflows.
- Created reports and sent emails.
- Enabled faster reviews of new releases, reduced manual testing effort, and improved documentation of test results and discovered defects.
David M.
Last position:
Senior Technical Consultant at BMW Group
- Architecture and development of enterprise React 19 based documentation platform for automotive software systems
- Full-stack implementation of visualization tools & interactive diagram viewers
- Performance optimization initiatives including virtual rendering for 10,000+ node trees and Web Worker-based search functionality
- Designed and implemented modular plugin architecture enabling extensible document rendering system
- Technical consultation on Git-based architecture-as-code workflows and modern design patterns
- Ownership of critical features from design through deployment, collaborating with cross-functional enterprise teams
Michael A.
Last position:
Founder & System Architect at Self-employed
- Development and operation of multiple digital platforms in logistics, catering, hotel industry, and SME digitization
- mampfen.at – Food delivery ecosystem (in production)
- ServicePortalPro – Service and automation platform (in production)
- ArtDorado – Art trading platform (rollout April 2026)
- ROOMMATE24 – Guest experience solution for hotels (rollout March 2026)
- firms.app – Business platform (currently in development)
- Various integration and automation projects
Gerhard Z.
Last position:
Embedded Software Engineer at Magna Kreisel Electric
- Development of a charging station for electric vehicles
- Tools: C/C++/Matlab/Simulink
- Development and testing of functional software with various communication buses
Andreas B.
Last position:
Freelance iOS Developer at Self-employed
NFC – Project: Development of a prepaid app solution that retrieves already paid services (credit) via an NFC connection between smartphone and terminal
Technologies: REST, NFC, Swift Concurrency, Keychain
KURIER edition & Futurezone.at: Development of white-label apps in partnership with Technical Apps for k-digital Medien GmbH
Technologies: REST, In-App Purchase, Push Notifications, Analytics, OAuth
White-label app for sports associations and institutions: iOS client connected to backend, focusing on modularity, flexibility, and customizability
Technologies: Swift packages (Network, Core, Business Logic, Frontend), MVVM pattern, reactive programming (Combine)
Magenta Sport iOS app: OTT sports platform by Deutsche Telekom with SSO (OAuth), HLS video streaming, DRM protection
Video player framework: Integration of the Sportradar OTT process, licensing model, HLS streams, DRM, analytics, Chromecast, AirPlay, Picture in Picture, Apple TV; available as an XCFramework via CocoaPods; used in WRC, MagentaSport, NHL TV
Collaboration on other apps: DFB and DFB Fanclub; LAOLA1.at; LAOLA1.tv; RedBull Salzburg (formerly)
Discover over 15,000 top freelancers
Statistics of experts using JSON
Aggregated from the professional profiles of matched freelancers.
Experience
19 years
Position duration
3.2 years
Positions per freelancer
9
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Banking and Finance, Manufacturing
Certification focus areas
Information Technology, Project Management, Quality Assurance
Bachelor's degree or higher
84%
Master's degree or higher
32%
Certifications per freelancer
3
Most common languages
German, English, Croatian
Speak two or more languages
100%
Based on our profile pool as of 29 Oct 2026.
Daily rate distribution
The chart shows how the daily rates of experts in this technology in Austria are distributed, based on recent contracts on our platform. Each bar covers a rate range — its height shows the share of experts charging within that range.
Average rates of experts in Austria 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 29 Oct 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 (84%)
- Banking and Finance (42%)
- Manufacturing (42%)
- Education (37%)
- Automotive (32%)
- Media and Entertainment (32%)
- Retail (32%)
- Energy (26%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
Data format
JSON, short for JavaScript Object Notation, is a lightweight text format for representing structured data. It uses objects, arrays, keys and values that both people and software can read easily. JSON is language-independent, but it is especially common in web applications, APIs, configuration files and event payloads.
Where it runs
JSON is the standard exchange format for many REST APIs and is also used in browser applications, mobile services, cloud integrations and microservices. It carries customer records, product data, permissions, search results and messages between systems. Companies in Austria use it across manufacturing, finance, retail, logistics and public services whenever systems need a clear data contract.
Schemas and validation
Reliable JSON work goes beyond writing valid braces and quotation marks. Specialists define schemas, required fields, data types, nesting rules and versioning policies, then validate payloads at system boundaries. They may work with JSON Schema, OpenAPI, contract testing and tools such as Ajv, Postman or command-line validators.
Typical deliverables
- Design JSON structures for REST and event-driven interfaces
- Document request and response payloads with OpenAPI
- Map JSON to databases, domain models and external services
- Transform, filter and validate nested data
- Diagnose parsing, encoding and compatibility errors
These deliverables often sit alongside API development, integration work, data migration and frontend or mobile application delivery. Strong specialists understand both the payload itself and the systems that produce or consume it.
When expertise helps
Freelance expertise is useful when an API needs a stable contract, when inconsistent payloads slow integrations or when legacy XML and JSON services must work together. It also helps during migrations, partner onboarding, schema redesigns and performance investigations. Remote collaboration works well because payload examples, schemas and API collections can be reviewed asynchronously, while clear English or German documentation may matter for teams in Austria.
Quality signals
A strong professional keeps JSON predictable, minimal and backward compatible. They distinguish absent values from explicit nulls, handle dates and numbers consistently, protect sensitive fields and test malformed input. Look for practical experience with API documentation, schema evolution, serialization libraries, authentication flows and observability. The best specialists explain trade-offs clearly and leave reusable schemas, tests and examples behind.
Frequently asked questions
Quick answers to the questions that come up most around JSON.
JSON is mainly used to exchange structured data between web clients, servers, mobile applications and connected services. It is also common in configuration, logging, event streaming and API documentation.
JSON is usually more compact and maps naturally to objects and arrays used in application code. XML offers richer document structure, namespaces and mature document-oriented tooling, so the right choice depends on the integration and validation requirements.
A strong JSON specialist usually understands REST, HTTP, OpenAPI, JSON Schema and at least one application language. Database mapping, authentication, testing, version control and cloud integration are also useful when payloads cross multiple services.
The need depends on the work. Simple payload changes may suit a professional familiar with API testing, while schema design, migrations and compatibility planning call for deeper integration experience. Ask for examples of systems where the specialist handled changing contracts and invalid input.
Yes. JSON deliverables such as schemas, examples, API collections and validation tests are easy to review remotely. On-site collaboration can still help when the work involves workshops with Austrian business teams, complex legacy integrations or close coordination with operations.
Review whether JSON structures are consistent, clearly documented and validated at system boundaries. Good work covers required fields, types, error responses, security concerns and compatibility with existing consumers rather than focusing only on whether a sample payload parses.
JSON Schema is valuable when several systems share payloads, when contracts change frequently or when invalid data creates costly failures. It gives teams a common way to describe types, constraints and required fields, but it should be maintained with the API and tested in delivery pipelines.
Freelancers working with JSON often resolve inconsistent field names, broken nesting, incorrect data types and serialization issues. They may also convert XML or CSV data, improve API contracts, document integrations and support a safe transition between payload versions.
The average hourly rate of freelancers in Austria who have used JSON in their recent projects is 99 €, which corresponds to a daily rate of about 790 € based on an 8-hour working day.
Of the freelancers in Austria who have used JSON in their recent projects, 84% hold at least a Bachelor's degree and 32% hold at least a Master's degree.
On average, freelancers in Austria who have used JSON in their recent projects have 19 years of professional experience, with a single engagement typically lasting around 3.2 years.
The most common languages among freelancers in Austria who have used JSON in their recent projects are German (100%), English (100%), and Croatian (21%).
The most common industries among freelancers in Austria who have used JSON in their recent projects are Information Technology (84%), Banking and Finance (42%), and Manufacturing (42%).
The most common business areas among freelancers in Austria who have used JSON in their recent projects are Information Technology (100%), Product Development (95%), and Quality Assurance (53%).
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.
Vienna Graz 
Vienna Countries:
- Germany
- Austria
- Switzerland
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