OpenAPI Experts in Austria
in minutes with AI-matched vetted freelancersHire experts who design OpenAPI specs, document REST APIs, and keep contracts aligned with implementation across microservices and client SDKs. FRATCH matches you fast with precise, vetted, available specialists.
Meet FRATCH Experts in Austria, who have recently used OpenAPI
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.
Jaroslav A.
Last position:
Child care, personal development and learning
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)
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.
Kurt B.
Last position:
Backend / Microservice Developer, DevOps, Test Automation at RCA, Rail Cargo Austria AG
- Backend / Microservice Developer, DevOps, Test Automation
- ~100 Devs, ~10 Teams, per team: 1 PO, 1 Scrum Master, 1 UX, 1 Developer, 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, FrontEnt, Test Automations)
- AI, Copilot, creating test templates
- Scheduler, Hangfire, Quartz
- Automated unit and integration tests
- Automated E2E tests, Playwright test automation, BDD, Gherkin, Cucumber
- Tracking of shipments
- GIS, GPS data, geofence, geo search, position tracking, asset positions
- Jira, Confluence
- Focus on high-performance message-oriented architecture (~xx million messages per month per service)
- Structured logging, Serilog, OTel, Splunk, Application Monitoring
- Integration of different position data sources (GPS-based data) into Azure Data Lake
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
20 years
Position duration
2.6 years
Positions per freelancer
10
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Banking and Finance, Insurance
Certification focus areas
Information Technology, Product Development, Project Management
Bachelor's degree or higher
80%
Master's degree or higher
60%
Certifications per freelancer
3
Most common languages
German, English, Bosnian
Speak two or more languages
100%
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 Austria 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 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 19 Sep 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 (43%)
- Insurance (43%)
- Transportation (43%)
- Education (29%)
- Media and Entertainment (29%)
- Professional Services (29%)
- Telecommunication (29%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
API contracts
OpenAPI is the standard way to describe REST APIs in a machine-readable format. It defines endpoints, request and response shapes, authentication, and errors so teams can agree on the contract before code ships. Strong specialists use it to keep backend, frontend, and partner integrations aligned.
Common deliverables
- OpenAPI 3.x specifications for new or existing APIs
- Swagger UI and Redoc documentation
- API guidelines for naming, versioning, and errors
- Mock servers and contract examples for testing
- Client SDKs and review-ready API change notes
Where it helps
Companies bring in OpenAPI experts when documentation is stale, integrations are fragile, or teams need a clean contract for public or internal APIs. It is common in SaaS, fintech, logistics, and enterprise systems that expose services to partners or mobile apps. In Austria, this often fits mixed teams that work in English but still need clear handover material for local stakeholders.
Ecosystem skills
OpenAPI work usually sits close to Swagger tools, JSON Schema, REST design, and CI checks that validate specs. Good specialists know how to keep examples realistic, separate reusable components, and avoid descriptions that drift away from actual behavior. They also understand how specs support generated clients, tests, and gateway policies.
What strong specialists do
- Turn existing endpoints into a precise API contract
- Spot inconsistencies between code and documentation
- Improve error models, pagination, and security schemes
- Keep specs readable for both engineers and product teams
- Update changes without breaking consumers
When to hire
Freelance OpenAPI specialists are useful when a project needs a quick audit, a contract-first rollout, or a cleanup of undocumented APIs. They also help during platform migrations, partner onboarding, and product launches where external teams depend on stable interface details. If your service already works but the API is hard to trust, a specialist can tighten the spec and the process around it.
Frequently asked questions
Curious about OpenAPI? Here are the answers that come up again and again.
OpenAPI is used to describe REST APIs in a format that tools can read and validate. It helps teams document endpoints, request and response bodies, authentication, and error handling in one shared contract. That makes it easier to build, test, and maintain APIs across different teams.
OpenAPI is the specification, while Swagger is the older umbrella name many people still use for related tools. In practice, searchers often say Swagger when they mean the spec, Swagger UI, or Swagger Editor. A good specialist understands both the current standard and the older terminology.
Bring in a OpenAPI freelancer when documentation is inconsistent, an API contract needs to be created, or existing specs no longer match the code. It is also a good fit before external partners, mobile apps, or internal teams start depending on the interface. A specialist can clean up the spec without slowing delivery.
A strong OpenAPI specialist usually understands REST design, JSON Schema, authentication patterns, and versioning. Experience with Swagger UI, Redoc, mock servers, and contract testing is a plus. The best professionals also write clear examples and keep the spec aligned with implementation.
A small OpenAPI task may only need someone who can document an existing service cleanly. Larger platforms need a specialist who can review design choices, spot edge cases, and set up review rules for future changes. The right level depends on whether you need documentation, governance, or full contract-first design.
Yes, OpenAPI work is often well suited to remote collaboration because most tasks are spec review, documentation, and API design. In Austria, many teams work across locations, so clear written communication in English is usually enough. On-site sessions can still help when a team needs fast alignment on a complex interface.
Look for a OpenAPI specialist whose specs are complete, readable, and consistent with the real API behavior. Good signs include clean examples, correct error models, sensible component reuse, and awareness of breaking changes. You should also see clear thinking about consumers, not just the schema itself.
Expect a OpenAPI spec that covers paths, parameters, schemas, security, and response codes in a structured way. Many specialists also provide documentation views, mock data, review notes, and guidance for generated clients or tests. The deliverables should make the API easier to consume and easier to maintain.
The average hourly rate of freelancers in Austria who have used OpenAPI in their recent projects is 93 €, which corresponds to a daily rate of about 743 € based on an 8-hour working day.
Of the freelancers in Austria who have used OpenAPI in their recent projects, 80% hold at least a Bachelor's degree and 60% hold at least a Master's degree.
On average, freelancers in Austria who have used OpenAPI in their recent projects have 20 years of professional experience, with a single engagement typically lasting around 2.6 years.
The most common languages among freelancers in Austria who have used OpenAPI in their recent projects are German (100%), English (100%), and Bosnian (14%).
The most common industries among freelancers in Austria who have used OpenAPI in their recent projects are Information Technology (100%), Banking and Finance (43%), and Insurance (43%).
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 Quality Assurance (71%).
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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