OpenAPI Expert in Austria
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Meet FRATCH Experts in Austria, who have recently used OpenAPI
Christian W.
Last position:
Lead Developer & Performance Specialist at Groox GmbH
Sole responsibility for the design, development and deployment of the bilingual Qwik platform eventvideo.at. Responsible for frontend performance optimization (PageSpeed 97/100/100/100), SEO engineering with Schema.org, integration of Google Search Console and IndexNow, and building the GitHub Actions CI/CD pipeline. Requirements gathering and technical implementation.
- Performance Engineering: Google PageSpeed Score 97/100/100/100 (Performance / Accessibility / Best Practices / SEO) through frontend optimization (lazy loading, thumbnail-first, lightweight media integration)
- Full-Stack Web Development: Sole responsibility for development with the Qwik.js framework from frontend to deployment for the bilingual (DE/EN) platform eventvideo.at, marketing personalized, fully automated participant videos for sports events
- Qwik.js Resumability Architecture: Server-side rendering with minimal JavaScript hydration overhead; the page remains immediately interactive even with extensive video and event content, without a full-page load.
- API Integration: Google Search Console API and IndexNow API for automated indexing and SEO monitoring
- SEO Engineering: Schema.org Structured Data implementation for rich snippets and improved search engine visibility
- Mobile-First with minimal bundle size: CSS3 layout without UI framework overhead, consistently lean use of resources for excellent PageSpeed on desktop and mobile.
- GitHub Actions CI/CD: Automated build, test and deployment pipeline for continuous integration
Technologies: Qwik.js Framework, TypeScript, JavaScript, Internationalization (i18n DE/EN), GitHub Actions CI/CD, Google Search Console API, IndexNow API, Schema.org, Google PageSpeed Insights, Lazy Loading, CSS3, Responsive Design
Daniel S.
Last position:
AI Strategy & Use-Case Development at Umwelt Service Salzburg
- AI strategy concept and implementation roadmap for an energy consulting company.
- Use-case matrix with nine application scenarios (including funding research, chatbot, initial AI consulting, topic radar), implemented as reusable Claude Code skills.
- AI strategy, use-case analysis / Claude Code Skills / n8n.
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.
Kurt B.
Last position:
Backend / Microservices Developer, DevOps, Test Automation at Fa. RCA, Rail Cargo Austria AG
- Backend / Microservices Developer, DevOps, Test Automation
- ~100 Developers, ~10 Teams, per Team: 1 PO, 1 ScrumMaster, 1UX, 1 Developers, 1 Tester
- .net core 8, 9, C#
- Microservices, Clean Architecture, MediatR, CQRS
- GraphQL, REST, SDL
- Azure DevOps, CI / CD pipelines, Azure Service Bus, Rabbit-MQ, Kafka, Azure App Configuration, Azure KeyVault, Azure Kubernetes AKS
- Splunk, dashboards, custom metrics, Elastic-Search, Kibana (ELK)
- Azure SQL Databases, Azure Cosmos DB
- Architecture decisions, event governance, COP (Backend, DevOps, FrontEnd, Test Automation)
- AI, Copilot, creating Test Templates
- Scheduler, Hangfire, Quartz
- Automated Unit and Integration Tests
- Automated E2E Tests, Playwright Test Automation, BDD, Gherkin, Cucumber
- Shipment tracking
- GIS, GPS data, geofence, geo search, position tracking, asset positions
- Jira, Confluence
- Focus on high-performance message-oriented architecture (~xx e6 messages / month / service)
- Structured logging, Serilog, OTel, Splunk, Application Monitoring
- Integration of different position data sources (GPS-based data) into AzureDataLake
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)
Jaroslav A.
Last position:
Child care, personal development and learning
Joseph W.
Last position:
Freelancer Cloud / Solution Architect (AWS) at A1 Bank
- I am responsible for providing solution architecture and technical assistance for a migration initiative aimed at transitioning to a new core banking system.
- The project involves replacing in-house development with a commercially available off-the-shelf core banking system operated as SaaS on AWS.
- Duties encompass solution design, technical coordination, supporting development teams, and providing IT support and troubleshooting.
- Managing over 10 global vendors and partners is crucial to project success.
- Technologies: VMWare ESXi, AWS, EKS Kubernetes, Mastercard Payment Transaction Service, Avaloq, A1 Telekom Austria infrastructure, CheckPoint FW, F5, Site-to-Site VPNs, PingID, Futurae SDK, Airlock, UC4/Automic, Firebase, iOS/Android lifecycle management, AWS IAM, AWS AppStream, AWS S3, AWS Transfer Family, QlikView, OpenAPI.
Maximilian A.
Last position:
Technical Project Lead / Solution Architect at UNIQA Insurance Group
- Planning, monitoring, coordination, and documentation of the output project as part of the policy migration to the UNIQA Insurance Platform.
- Planning and design of new requirements.
- Designing a consistent, maintainable, and scalable application architecture.
Christian H.
Last position:
Senior Full Stack Developer at Adria Magazin GmbH
Jesolo Tickets – Booking platform for tickets
Design and implementation of a multi-tenant booking platform for the online sale of bus and ferry tickets in the Jesolo region of northern Italy. Travel agencies and event organizers embed a customizable booking widget on their own websites; travelers check live availability, book multiple passengers and pay online in just a few clicks.
- Real-time booking: Schedules and prices are provided live via the transport providers' APIs; after payment, tickets are automatically delivered as QR-coded PDFs – with no manual issuing required.
- Provider architecture: New providers can be onboarded without code changes; an origin-based multi-tenant model with its own domain and payment configuration for each partner site allows the platform to grow with every customer.
- Clean architecture: Three-layer structure (Handlers → Services → Data Store) with caching – availability queries remain fast and maintainable even with many parallel requests.
Tech-Stack: Go, Echo, PostgreSQL (pgx), Stripe, Web Components, Tailwind CSS, esbuild, Docker, GitLab CI, Hetzner VPS
Discover over 15,000 top freelancers
Statistics of experts using OpenAPI
Aggregated from the professional profiles of matched freelancers.
Experience
19 years
Position duration
2.2 years
Positions per freelancer
16
Top business areas
Information Technology, Product Development, Project Management
Top industries
Information Technology, Banking and Finance, Insurance
Certification focus areas
Information Technology, Project Management, Product Development
Bachelor's degree or higher
71%
Master's degree or higher
57%
Certifications per freelancer
3
Most common languages
German, English, Bosnian
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 OpenAPI
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.
OpenAPI 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 (100%)
- Banking and Finance (44%)
- Insurance (44%)
- Transportation (44%)
- Media and Entertainment (44%)
- Professional Services (44%)
- Education (33%)
- Healthcare (33%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
API Contracts
OpenAPI is a vendor-neutral specification for describing HTTP APIs in a machine-readable format. It defines paths, parameters, request bodies, responses, authentication and data models in YAML or JSON. Teams use the contract to align frontend, backend and external consumers before implementation begins.
What It Builds
OpenAPI supports REST APIs for web applications, mobile services, partner integrations and internal platforms. A precise specification can generate interactive documentation, client libraries, server stubs, validation rules and mock responses.
- Public and internal REST API contracts
- Partner and payment integrations
- Service-to-service interfaces
- Mock APIs for parallel delivery
Ecosystem And Tooling
The ecosystem includes Swagger UI, Swagger Editor and Swagger Codegen, as well as tools such as Redoc, Stoplight and Postman. Specialists work with OpenAPI documents in Git workflows, connect them to CI pipelines and validate changes with linting and contract tests. They also understand JSON Schema, OAuth 2.0 and common API gateways.
When Companies Need Help
Companies often bring in freelance OpenAPI expertise when an API is inconsistent, poorly documented or difficult for partners to adopt. Support is also useful during a service migration, a platform integration or a move from informal endpoint notes to a governed contract.
- Standardising API descriptions across teams
- Reviewing breaking changes and versioning plans
- Generating documentation and SDKs
- Introducing contract testing into delivery
Skills Around OpenAPI
Strong professionals combine specification work with practical API design. They can model reusable schemas, choose clear resource structures, document error responses and define security schemes without hiding important behaviour. Experience with REST semantics, HTTP, Git, CI/CD and cloud gateways helps them turn a document into a dependable integration boundary.
For projects in Austria, remote collaboration usually works well when repositories, review rules and ownership are clear. On-site workshops can still help when several product teams or external partners must agree on a shared contract.
What Good Work Looks Like
A high-quality OpenAPI document is complete, consistent and useful to its readers. Examples match the declared schemas, required fields are explicit, error cases are documented and authentication flows are understandable. The specification stays close to the running API through automated validation and review.
Ask professionals to show how they handle backward compatibility, reusable components, pagination, webhooks and generated artefacts. The strongest specialists explain trade-offs clearly, adapt to existing standards and write documentation that product teams, developers and integration partners can use without guesswork.
Frequently asked questions
Curious about OpenAPI? Here are the answers that come up again and again.
OpenAPI is used to describe HTTP APIs in a structured format that both people and tools can read. Companies use it for API design, documentation, mock services, validation, contract testing and generating client or server code.
OpenAPI is the specification maintained by the OpenAPI Initiative, while Swagger is the name associated with the earlier specification and a family of tools such as Swagger UI and Swagger Editor. In practice, people still use “Swagger” when they mean an OpenAPI document or its surrounding tooling.
OpenAPI is often chosen for its broad tooling support, familiar HTTP model and strong adoption across API gateways and documentation tools. RAML can suit organisations that prefer its design language and governance approach, so the right choice depends on existing standards, integrations and team skills.
An OpenAPI specialist should understand REST design, HTTP semantics, JSON Schema, YAML, authentication and API versioning. Experience with Git, CI/CD, contract testing, API gateways and tools such as Postman or Redoc is also valuable.
The required OpenAPI expertise depends on the scope and risk of the API. A small documentation update may need focused specification knowledge, while a shared platform contract requires strong skills in modelling, governance, compatibility and automated validation.
Yes, OpenAPI work is well suited to remote collaboration because specifications, reviews and validation can live in shared repositories. Teams in Austria should define review ownership, documentation language and meeting expectations early, especially when external partners are involved.
Review whether the OpenAPI document reflects the running API, covers success and error responses, uses consistent schemas and explains authentication clearly. Ask for examples of automated linting, contract tests, change review and handling of backward compatibility.
Before working with OpenAPI, clarify the source of truth, API consumers, existing standards, release process and ownership of generated artefacts. Also confirm whether the task covers design, documentation, tooling integration, migration from Swagger or alignment with an existing gateway.
The average hourly rate of freelancers in Austria who have used OpenAPI in their recent projects is 90 €, which corresponds to a daily rate of about 718 € based on an 8-hour working day.
Of the freelancers in Austria who have used OpenAPI in their recent projects, 71% hold at least a Bachelor's degree and 57% hold at least a Master's degree.
On average, freelancers in Austria who have used OpenAPI 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 Austria who have used OpenAPI in their recent projects are German (100%), English (100%), and Bosnian (11%).
The most common industries among freelancers in Austria who have used OpenAPI in their recent projects are Information Technology (100%), Banking and Finance (44%), and Insurance (44%).
The most common business areas among freelancers in Austria who have used OpenAPI in their recent projects are Information Technology (100%), Product Development (100%), and Project Management (56%).
Main locations of FRATCH Experts, who have recently used OpenAPI
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.
Countries:
- Germany
- Austria
- Switzerland
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Philipp Thomaschewski
FRATCH CEO
