Swagger Experts in Stuttgart
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Meet FRATCH Experts in Stuttgart, who have recently used Swagger
Sercan T.
Last position:
Co-Founder & Lead Software Architect at Pflege-Pfad
- Focus: System architecture, cloud-native platforms, microservices, API design
- Product: Pflege-Pfad is a digital placement platform that directly connects relatives of people in need of care with verified care services and caregivers – without an agency and without ongoing fees.
- Business analysis & process design:
- Analysis of the German care market and identification of the key pain points of both target groups.
- Modeling of core business processes: registration, verification, care request, application, placement, and rating.
- Definition of the business model as a freemium/premium model with optional contact unlocking.
- Creation of user stories and requirements documentation for relatives, care services, and administrators.
- Design of trust and quality assurance mechanisms with document upload, admin review process, and rating system.
- Coordination with stakeholders and validation of product decisions with potential users.
- Technical implementation:
- Design and implementation of the entire platform architecture as the sole developer.
- Design and implementation of a REST API with Spring Boot and Kotlin, including JWT-based authentication.
- Development of the frontend as a single-page application with Angular 17.
- Implementation of the AWS infrastructure with EC2, RDS PostgreSQL, S3, CloudFront, and IAM.
- Document upload with AWS S3 using presigned URLs to verify care services.
- Email notifications via Resend API.
- AI-supported care service search via OpenAI API.
- Implementation of complete user flows such as registration, login, password reset, and the placement process.
- Development of an admin panel for user and care service management as well as analytics.
- CI/CD with GitHub Actions and containerized deployments with Docker.
- End-to-end tests with Playwright.
Technologies: Kotlin, Spring Boot 3, Spring Security, JWT, JPA/Hibernate, PostgreSQL, Angular 17, TypeScript, RxJS, AWS (EC2, ECS, S3, CloudFront CDN, RDS PostgreSQL, IAM), nginx, GitHub Actions, Playwright, Maven, Git, OpenAI API, Resend API, Docker, Scrum, i18n (DE/EN/TR), Kiro, feature flag architecture.
Will O.
Last position:
Solution Architect at Polizei Behörde Stuttgart
Designed a migration strategy for WLS applications to BKA Cloud and Stack IT
Created a hybrid cloud for internal testing and development with Kubernetes
Transformed the IT landscape from an outdated monolithic architecture to a cloud-based architecture
Integrated new CI/CD processes using Azure Pipelines
Quadrupled the processing throughput for personnel security checks
Migrated personnel security screening applications to Docker-based applications
Implemented CI/deployment pipelines using Azure DevOps
Environment: Java Springboot, Kubernetes, Oracle Weblogic, OpenID, Camunda, JUnit, TOGAF
Matthias S.
Last position:
Software Developer and Consultant at CLADE GmbH
- Analysis of the existing CAN communication between microcontrollers
- Analysis of the sensors used and the measured values collected
- Planning the CAN messages for transmitting the measured values
- Iterative adjustment of the microcontroller code to the new CAN messages
- Cross-compilation from x64 to arm64
Robin S.
Last position:
Senior Cloud & Backend Engineer at Media-Saturn-Holding GmbH
- Implementing applications with Kotlin and Ktor as microservices
- Using MongoDB in the MongoDB Atlas cloud
- Asynchronous communication of services via Google Pub/Sub
- Using Kotest and MockK for unit tests
- Developing an administration frontend with TypeScript, React and Express.js
- Provisioning environments in GCP using Terraform
- Implementing CI/CD processes with GitHub Actions
- Operating scalable production and test environments in GCP with Kubernetes, Helm and Flux CD
- Monitoring environments with Prometheus and Grafana
- Providing BI data in the Google BigQuery data warehouse
Achille C.
Last position:
Backend/Frontend Developer at ITZ-Bund
Development of a microservice application for calculating postings on accounts
Development of backend components with Java or JEE, Quarkus, Kafka, Rest API
Development of the test component with mocking frameworks (Mockito)
Development of integration test components
Creation of OpenAPI specification format
Configuration of CI/CD pipeline
Development of frontend components with React
Design, further development and optimization of system structures
Code review
Java Corretto 21, JEE, Quarkus, Golang
Reactive programming with Spring WebFlux, Project Reactor
Git, Azure DevOps for CI/CD pipeline, YAML, Json Swagger UI, Postman, Rest OpenAPI, Kafka Streams, Kafka Connect, Log4J
Microservices, Jira, Confluence, MySQL, Docker, Kubernetes (deployment via Helm charts)
Spring Security, OAuth 2, JWT, Sonarqube
IntelliJ, Maven, logging framework Splunk, Agile method Scrum, Nexus, Vaadin V24, build tool Vite
React, React.JS, Node.js, Jess/JavaScript, Tailwind CSS, Agile method Scrum, accessibility BITV, Playwright
Matthias M.
Last position:
Founder at CaseOS Low-Code Platform
Discover over 15,000 top freelancers
Statistics of experts using Swagger
Aggregated from the professional profiles of matched freelancers.
Experience
19 years
Position duration
2.7 years (Germany: 1.7 years)
Positions per freelancer
19 (Germany: 14)
Top business areas
Information Technology, Product Development, Operations
Top industries
Information Technology, Automotive, Banking and Finance
Certification focus areas
Information Technology, Product Development, Project Management
Bachelor's degree or higher
100% (Germany: 90%)
Master's degree or higher
60% (Germany: 53%)
Certifications per freelancer
3 (Germany: 2)
Most common languages
German, English, French
Speak two or more languages
100% (Germany: 98%)
Based on our profile pool as of 16 Oct 2026.
Daily rate distribution
The chart shows how the daily rates of experts in this technology in Stuttgart 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 Stuttgart using Swagger
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 16 Oct 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
Swagger 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%)
- Automotive (67%)
- Banking and Finance (67%)
- Insurance (67%)
- Manufacturing (67%)
- Government and Administration (67%)
- Transportation (50%)
- Retail (50%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
API contracts
Swagger is widely used to describe, document and explore HTTP APIs. The current standard is OpenAPI, while Swagger remains the familiar name for tools such as Swagger UI and Swagger Editor. A clear contract defines endpoints, parameters, request bodies, responses, authentication and error formats before implementation is complete.
Core tooling
The ecosystem covers the full documentation workflow. Swagger Editor helps specialists write and validate OpenAPI files, while Swagger UI turns them into interactive reference pages. Swagger Codegen and related generators can create client libraries, server stubs and model classes from a contract. Strong work also includes version control, linting and reusable schemas.
Where it fits
Companies use Swagger and OpenAPI for internal services, public APIs and integrations between web, mobile and business systems. Typical deliverables include:
- OpenAPI specifications for REST endpoints
- Interactive Swagger UI documentation
- API reference portals for partners and customers
- Generated clients, server stubs and data models
- Contract checks in CI pipelines
When expertise matters
Freelance specialists are useful when an API has grown without a reliable contract, when several teams need a shared interface, or when documentation must be published with each release. They can map existing endpoints, resolve inconsistent schemas and introduce a review process without slowing delivery. In Stuttgart, this can support industrial, mobility, software and business-service teams working across local and remote groups.
Skills around Swagger
Effective work goes beyond editing YAML or JSON. It requires practical knowledge of REST design, HTTP methods and status codes, JSON Schema, OAuth 2.0 or API keys, and the service framework behind the API. Specialists may also connect Swagger UI with gateways, test suites, mock servers and CI systems, while understanding OpenAPI 3.x and migration from older Swagger specifications.
Choosing a specialist
Look for professionals who can show how an API contract improved implementation, testing or collaboration. They should explain design decisions, handle backward compatibility and keep examples aligned with actual responses. A useful review includes validation results, security definitions, error cases, naming consistency and documentation that a new consumer can follow without personal guidance.
Frequently asked questions
Key details about Swagger, drawn from the questions we get asked most.
Swagger is a set of tools and conventions used to describe, document and test HTTP APIs. Its best-known tools include Swagger UI and Swagger Editor, while OpenAPI is the current specification commonly associated with the Swagger name.
Swagger was the earlier name of the API specification that became OpenAPI under the OpenAPI Initiative. Many teams still say Swagger when referring to the wider tooling ecosystem, but a specialist should distinguish the specification version from tools such as Swagger UI.
Swagger work benefits from knowledge of REST design, HTTP semantics, JSON Schema and authentication methods such as OAuth 2.0. Experience with API gateways, automated tests, mock servers, CI pipelines and frameworks used by the service is also valuable.
Swagger expertise is useful when documentation is incomplete, several teams depend on the same API, or a company needs contract checks before releases. A specialist can assess existing endpoints, create an OpenAPI contract and connect documentation with testing and delivery workflows.
Swagger and Postman serve different primary purposes. Swagger and OpenAPI focus on a machine-readable API contract and interactive reference documentation, while Postman is centered on sending requests, organizing collections and running request-based tests; many teams use both.
Swagger projects are often suitable for remote collaboration because specifications, reviews and documentation can be managed in shared repositories. On-site work in Stuttgart can still help when the API connects to physical systems, regulated environments or teams that need close workshop support.
Swagger tasks may be straightforward for a small, stable API but become more demanding when there are many consumers, legacy endpoints or strict compatibility needs. Choose a specialist based on the API’s complexity, integration landscape and release process rather than on a generic experience label.
Swagger documentation should match real responses, cover success and error cases, define security clearly and pass automated validation. Ask the specialist to demonstrate versioning, backward-compatibility decisions and how a new API consumer would find and use the required information.
The average hourly rate of freelancers in Stuttgart, Germany who have used Swagger in their recent projects is 109 €, which corresponds to a daily rate of about 875 € based on an 8-hour working day.
Of the freelancers in Stuttgart, Germany who have used Swagger in their recent projects, 100% hold at least a Bachelor's degree and 60% hold at least a Master's degree.
On average, freelancers in Stuttgart, Germany who have used Swagger in their recent projects have 19 years of professional experience, with a single engagement typically lasting around 2.7 years.
The most common languages among freelancers in Stuttgart, Germany who have used Swagger in their recent projects are German (100%), English (100%), and French (33%).
The most common industries among freelancers in Stuttgart, Germany who have used Swagger in their recent projects are Information Technology (100%), Automotive (67%), and Banking and Finance (67%).
The most common business areas among freelancers in Stuttgart, Germany who have used Swagger in their recent projects are Information Technology (100%), Product Development (100%), and Operations (83%).
Main locations of FRATCH Experts, who have recently used Swagger
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 
Dusseldorf Countries:
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