REST API Experts in Austria
to connect products faster with vetted, available freelancers matched by AIHire experts who design resource-oriented interfaces, secure authentication flows and reliable integrations with databases, web apps and cloud services. Get precise matches to vetted, available freelancers who can collaborate remotely or on-site across Austria.
Meet FRATCH Experts in Austria, who have recently used REST API
Chrisabel P.
Last position:
AI Systems & Product Strategy Expert at Webmeisterin
I build. I advise. I think in systems. After years leading digital transformation at scale — Accenture, BP, Lidl — I made a deliberate choice: trade platform dependency for structural independence. My focus is at the intersection of AI systems, product strategy, and venture thinking. I work with operators and founders who want to move fast without losing control — of their data, their stack, their direction.
Karl F.
Last position:
ONECEPT Website at ONECEPT GmbH
Development and implementation of the website onecept.at using React/Next.js. Focus on responsive web design, high-performance component structure, basic SEO optimization, and technical deployment.
Technologies: React, Next.js, TypeScript / JavaScript
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.
Michael L.
Last position:
IAM Developer & IT Architect at Internationale Bank
Design and implementation of new functionalities in the areas of Lifecycle Management (LCM), Role Management (RLM) and Access Governance
Adjustment of the company-wide Segregation of Duties (SoD) matrix to ensure regulatory and internal compliance requirements
Further development and configuration of recertification processes
Creation and adaptation of custom workflows, rules and tasks in SailPoint IdentityIQ (BeanShell, XML, Java)
Use of static code analysis with SonarQube to ensure code quality and compliance with defined development standards
Regular code reviews within the development team to ensure quality, share knowledge and follow clean code principles
Work in an agile Scrum team with daily communication, sprint planning and reviews
Coordination with testers, test managers and business departments to ensure quality and smooth production rollout
Active involvement in release planning and deployment coordination, including test preparation, cutover activities and rollback strategies
Analysis and sustainable resolution of issues in the IAM production environment (2nd- and 3rd-level support)
Reproduction of complex errors, identification of root causes and implementation of lasting fixes
Creation of technical analyses and recommendations for operations and further development
Marcel S.
Last position:
Senior AI Engineer - Python at Insurance Company
Project Tech Stack: Python, AWS, Azure, FastAPI, openai, pandas, unittest/pymock
Achievements:
- Engineered automated data extraction pipelines to transform complex Excel datasets into structured formats via LLM-driven workflows.
- Architected a generative slide-deck engine that translates natural language prompts into formatted presentation assets.
- Integrated advanced LLM capabilities with the OpenAI Response API, implementing sophisticated tool-calling and structured output logic.
- Developed and containerized scalable backend microservice using FastAPI, Docker, and OpenShift to host and serve agentic skills.
Immo M.
Last position:
Interim Manager/Management Consultant at Austrian regional energy supplier
Further development of the data analytics system landscape based on MS Power BI
- Concept and development of ETL processes, primary data source SAP IS/U incl. extraction via Theobald extractors to Azure Synapse, support with SAP S/4 conversion
- Support in the concept and development of data models in Azure Synapse Analytics
- Gathering and implementation of requirements in the data analytics area from internal business units
- Identification, documentation and analysis of existing as well as cross-functional processes
- Data definition, data modeling & preparation as well as source selection for merging data from differently structured data sources
- Design of reports and dashboards based on MS Power BI
- Transfer of reporting processes from existing structures to MS Power BI Premium (PPU)
- Hands-on development and implementation of analyses, reports and dashboards based on Microsoft Power BI
- Power Apps for write-back processes from Power BI Premium to Azure SQL DB
- Power BI support as part of the SAP S/4 conversion
- Cooperation with internal business units and external development partners
- Coaching/training, documentation, development processes
Jörg P.
Last position:
Process Manager (70%) / Business Analyst (30%) at T-Mobile Austria GmbH (Magenta)
- BSS system implementation for B2B / transformation of the central B2B system landscape
- End-to-end business responsibility for defining, structuring and prioritizing key B2B business processes as part of a complex BSS transformation.
- Work in an agile, SAFe-like setup with multiple teams involved, along with regular coordination with business, IT, solution design and architecture.
- Translation of business requirements into implementable epics, features, user stories, process models and acceptance criteria as the basis for technical implementation.
- Close collaboration with solution design and architecture to assess technical dependencies, interfaces, data flows and system impacts.
- Management of target process design as the basis for implementation in Infonova BSS.
- Interface management between business departments, IT, architecture, development and operational units, including facilitation of cross-functional workshops.
- Ensuring process consistency, governance, decision-making capability and business acceptance as part of the system implementation.
Michail M.
Last position:
OpenShift Specialist, Developer at Insurance
Project goal: Introduce OpenShift as the run-time platform and migrate all applications to OpenShift.
My contribution: Make sure logging and monitoring for the applications were in place. Set up and put into operation the OpenShift components for logging and monitoring (Elasticsearch, Prometheus, and Grafana). Develop and implement the security concept for OpenShift. Work with developers to define and carry out the application changes needed for the OpenShift migration. Integrate monitoring into the applications.
Technical environment: Java, WebSphere Liberty, OpenShift components, Elasticsearch (ELK stack), Prometheus, Grafana.
Peter S.
Last position:
Lead Software Architect at Pritz IT GmbH
- Lead software architect in a greenfield MES project (Manufacturing Execution System / factory control system), responsible for architecture decisions, technology selection, and technical direction throughout the entire development lifecycle
- Designed and built the core framework from scratch, including several reusable Spring Boot starters (e.g., OPC-UA integration, messaging, security) that enable flexible composition of the individual system modules
- Introduced Keycloak as the central authentication and authorization system with SSO across all MES components
- Created and owns the full CI/CD pipeline covering Java, NPM and Docker – automating build, test, containerisation and deployment across all project components
- Set up the architecture documentation space in Confluence as the single source of truth for all architecture decisions, component designs, and integration patterns
- Defined and enforced naming conventions and coding standards to ensure consistency in the growing codebase
- Conducted regular code reviews for quality assurance, knowledge sharing, and adherence to architecture guidelines
- Created and maintained technology roadmaps to guide future development priorities and infrastructure investments
Florian F.
Last position:
Freelance Senior Developer at Green Compliance GmbH
- Developed a CRM solution using the Vaadin UI framework
- Implemented a digital audit workflow for efficient handling of review and approval processes
- Supported structured management of customer and project data and ensured compliance
- Focused on usability, process automation, and integration into existing systems
Werner P.
Last position:
Industrial Innovation & Digital Product Advisory at VarionImpact
I help industrial companies in strategy and implementation of digital products.
I work with companies that see software, automation, and connected systems as core drivers of growth or are in the process of becoming exactly that. I help organizations turn technological potential into market-relevant solutions by aligning strategy, product thinking, and execution.
My work sits at the intersection of industry expertise, software, and business impact.
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)
Markus K.
Last position:
Document Development at Insurance Company
- Replacement of original Dopix documents and modules into the Quadient document environment
- Extension of document logic
Thomas P.
Last position:
QA Tech Lead at ready2order GmbH
- Leading a team of QA Engineers
- Implementing effective test strategies, driving the test automation strategy forward
- Hands-on testing for the web and mobile application (iOS, Android)
- Creating, maintaining, and executing test plans as well as documenting test results (Testrail)
- Evaluating and integrating new tools to improve the testing process (e.g. Playwright)
Discover over 15,000 top freelancers
Statistics of experts using REST API
Aggregated from the professional profiles of matched freelancers.
Experience
18 years
Position duration
2.7 years
Positions per freelancer
9
Top business areas
Information Technology, Product Development, Project Management
Top industries
Information Technology, Banking and Finance, Manufacturing
Certification focus areas
Information Technology, Project Management, Product Development
Bachelor's degree or higher
83%
Master's degree or higher
54%
Doctorate
2%
Certifications per freelancer
3
Most common languages
German, English, Italian
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 REST API
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.
REST API 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 (92%)
- Banking and Finance (48%)
- Manufacturing (34%)
- Healthcare (32%)
- Transportation (32%)
- Professional Services (32%)
- Government and Administration (28%)
- Retail (28%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
REST API fundamentals
A REST API is a web interface that lets software exchange data through HTTP. It represents resources such as users, orders or products and uses methods including GET, POST, PUT, PATCH and DELETE. Clear URLs, stateless requests and predictable responses make REST API services practical to consume and maintain.
What it builds
REST APIs connect customer-facing applications with business systems, databases and external services. Companies use them for mobile back ends, web applications, partner integrations, payment flows, booking systems and internal tools. The interface becomes a stable contract between independently released parts of a technology landscape.
- Expose product and account data to web or mobile clients
- Connect SaaS products, ERP systems and partner services
- Support search, filtering, pagination and file operations
- Provide versioned endpoints for evolving products
Ecosystem and tooling
Strong specialists work across HTTP, JSON, URI design and common status codes. Their toolset may include OpenAPI and Swagger for contracts and documentation, Postman for exploratory testing, and frameworks such as Spring Boot, Express, Django REST Framework or ASP.NET Core. They also connect APIs to SQL or NoSQL stores, message queues and cloud services.
Security and reliability
Production interfaces need more than working endpoints. Experts apply OAuth 2.0, OpenID Connect, API keys or signed tokens where appropriate, while enforcing authorization at resource level. They handle validation, rate limiting, logging, error formats, retries, caching and monitoring so integrations remain safe and predictable under changing conditions.
When to bring in specialists
Freelance expertise helps when an API needs a new public contract, a legacy interface needs modernization or several systems must exchange data without breaking existing consumers. It is also useful before a major client launch, during an integration backlog or when documentation and tests no longer reflect the running service. In Austria, remote delivery often works well, while on-site workshops can help align product, security and operations teams.
- Existing endpoints change without a clear migration path
- Partners report inconsistent responses or authentication failures
- Manual integration work slows releases
- Documentation, contract tests or observability are missing
What quality looks like
A capable professional starts with consumer needs and domain resources rather than endpoint names alone. They define consistent representations, meaningful errors and explicit compatibility rules, then verify them with unit, integration and contract tests. Look for experience with API lifecycle management, secure deployment and clear technical communication in the languages your Austrian team uses.
Frequently asked questions
The facts hiring teams ask for most often when it comes to REST API.
A REST API lets web, mobile and business applications exchange resources over HTTP. Companies use it to expose data and actions, connect internal systems, and integrate products with partners or third-party services.
REST API designs usually organize resources around URLs and use standard HTTP behavior, which makes them broadly understood and easy to cache. GraphQL lets clients shape responses more precisely, while SOAP provides stricter message and contract conventions; the right choice depends on consumers, governance and integration requirements.
A strong REST API specialist should understand HTTP, JSON, relational or document databases, authentication and automated testing. Experience with OpenAPI, Docker, cloud deployment, observability and frontend or mobile consumption is also valuable because interface decisions affect the whole delivery chain.
The scope matters more than a fixed career duration. A straightforward internal interface may suit a professional familiar with HTTP and one framework, while a public API with many consumers needs proven skill in versioning, security, performance and operational support.
Yes. REST API work is often suitable for remote collaboration because contracts, repositories, test suites and API documentation can be reviewed online. On-site sessions in Austria can still help with domain discovery, security decisions and coordination across product or operations teams.
Review whether the REST API has consistent resource naming, status codes, validation, error responses and documentation. Ask to see how the professional handles authentication, backwards compatibility, automated tests, monitoring and failure scenarios rather than judging isolated endpoint code.
A REST API may be less suitable when clients need highly variable data shapes, continuous bidirectional updates or strict enterprise messaging contracts. GraphQL, WebSockets, event-driven interfaces or SOAP can be better choices for those requirements, sometimes alongside REST rather than instead of it.
A REST API specialist may deliver resource models, endpoint implementations, OpenAPI documentation, authentication flows and integration tests. Depending on the assignment, they can also provide migration plans, contract testing, deployment configuration and guidance for client teams consuming the interface.
The average hourly rate of freelancers in Austria who have used REST API in their recent projects is 99 €, which corresponds to a daily rate of about 791 € based on an 8-hour working day.
Of the freelancers in Austria who have used REST API in their recent projects, 83% hold at least a Bachelor's degree, 54% hold at least a Master's degree, and 2% hold a doctorate.
On average, freelancers in Austria who have used REST API in their recent projects have 18 years of professional experience, with a single engagement typically lasting around 2.7 years.
The most common languages among freelancers in Austria who have used REST API in their recent projects are German (100%), English (100%), and Italian (12%).
The most common industries among freelancers in Austria who have used REST API in their recent projects are Information Technology (92%), Banking and Finance (48%), and Manufacturing (34%).
The most common business areas among freelancers in Austria who have used REST API in their recent projects are Information Technology (100%), Product Development (88%), and Project Management (52%).
Main locations of FRATCH Experts, who have recently used REST API
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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