Swagger Experts in Berlin
matched in minutes with vetted, available freelancersHire experts who design OpenAPI contracts, generate client libraries and maintain interactive API documentation with Swagger UI and SwaggerHub. Get fast, precise matching with vetted, available freelancers.
Meet FRATCH Experts in Berlin, who have recently used Swagger
Toralf C.
Last position:
IT Consultant in PKI Software Development at BWI
- Implementation of a full-stack application with Angular as frontend framework and Java as backend language
- Use of the Swagger OpenAPI specification for REST communication between frontend and backend applications
- Control of a card printer via the Nexus Card SDK framework
- Design and implementation of card management software with web interface and JavaFX module for printer monitoring
- Use of Cucumber tests for test automation and creation of test artifacts for testing outside the development environment
- Use of Wireshark for network investigations to analyze the API of a third-party product and to check the REST API of the self-developed software
Mukund B.
Last position:
Voice AI Chatbot - Real-Time Audio Assistant
- ▶ Built real-time voice assistant (STT → LLM → TTS pipeline) benchmarking and evaluating multiple STT providers including faster-whisper and Azure Speech. achieved sub-3s latency, Groq API (Llama 3) with multi-turn memory - directly handling edge cases in dictation, names and passcode recognition.
Rüdiger S.
Last position:
Full-Stack Software Engineer / Consultant for Digitalization at ARTEVENT
Designed, built, and launched an internal event planning web application used by over 100 department leads for a large event, despite having no dedicated testing phase.
Ensured smooth, failure-free operation during first production use, leading to the tool being adopted for future events.
Automated catering calculations and related workflows, significantly reducing email communication and manual computation effort for meal planning.
Managed deployment and hosting on a Linux server using Coolify, including application setup and runtime operations.
Hired and guided a communication designer on UX while independently owning all technical decisions and implementation.
Aruldass A.
Last position:
Web Module Lead at Mphasis Limited
- Led the end-to-end delivery of enterprise full-stack web applications by driving requirement analysis, solution design, frontend and backend development, database design, API integration, code reviews, team coordination, Agile execution, CI/CD deployments, production support, performance optimization, security implementation, and stakeholder collaboration to deliver scalable, high-quality software solutions.
Murad H.
Last position:
Founder & Technical Lead at Hubpoint.Ai
- Founded an AI-powered scheduling and business-management SaaS for SMBs, owning technology strategy, architecture, product development, UX, billing and go-to-market execution.
- Architected and shipped a multi-tenant platform with REST APIs, RBAC, CRM, billing and notifications, powering the manager dashboard, admin console, booking experience and iOS/Android applications.
- Led and mentored 7 software engineers, 1 DevOps engineer, 1 QA engineer and 1 UX/UI designer, while remaining hands-on across backend, frontend and product delivery.
- Built AI voice and chat agents using Python/FastAPI, OpenAI and Anthropic APIs, RAG, pgvector and tool calling; integrated Twilio, Google Calendar/Meet, Stripe and Firebase.
- Owned production infrastructure and automated delivery across separate environments using Docker, Nginx, GitHub Actions and Grafana; represented the company at accelerators and international startup events.
Selected stack: Python, FastAPI, Node.js, Vue 3, React/Next.js, React Native, PostgreSQL, Redis, Docker
Yavuz Ö.
Last position:
Full-Stack Developer – Practical Project Work at Sybarium Limited
Company in the industrial sector
Projects completed during retraining
- Rebuilt the company website from WordPress using a modern stack with Astro and TypeScript, deployed on Vercel (live at sybarium.vercel.app); replaced the legacy CMS with a faster, maintainable system.
- Reduced page load time by ~80% (from 5 s to under 1 s) through optimization, caching, and asset optimization.
- Developed n8n automation workflows that integrate several REST APIs and internal systems, saving more than 3 hours of manual work per week.
Taha H.
Last position:
Senior Salesforce Developer at Eurofiber
- Implemented Service Tickets functionality for the HOLAWAL Partner Portal, taking full ownership of the epic from architectural design to delivery
- Conducted stakeholder meetings, defined solution approach, and developed a reusable dynamic LWC component that enables configurable flow creation through JavaScript file settings
- Implemented the IP-VPN workflow as a new business product and managed its end-to-end delivery using Salesforce Communication Cloud
- Designed and developed a customer-facing quoting mechanism enabling external customers to view and accept quotes seamlessly
- Localized and enhanced the customer portal by implementing Dutch translations, improving usability and engagement for a major Dutch client
- Designed a quote request submission flow for the customer portal using Balsamiq wireframing tool, ensuring all required details were captured upfront
- Developed an order form flow using Lightning Web Components to capture products, linked services, and service locations
- Configured Salesforce Industries CPQ by modifying existing products, adding new attributes, and implementing validations to enhance product customization and accuracy
- Implemented Apex mocking using the FFLIB library to build efficient, maintainable, and high-coverage test classes
Can K.
Last position:
DevOps Specialist at Eviden Germany GmbH
Manage the development release and update process for a digitized nationwide trade register project "AuRegis".
Support software in Kubernetes/OpenShift environments, configure management with Kustomize, and implement CI/CD pipelines using Jenkins/GitLab, SonarQube, ArgoCD, and Azure.
Oversee system release of microservice architecture.
Build the CI/CD stack from scratch with GitLab CI, integrating integration tests, dependency checks, and security measures.
Automate deployment onto OpenShift using Kustomize.
Set up infrastructure components for development, code review, and code quality analysis including SonarQube.
Integrate GitOps tools such as Kustomize and ArgoCD, using both Azure and private cloud for sensitive data handling.
Develop Python scripts in Jenkins for cryptostore configuration and system packaging of products and microservices into deployable units.
Automate delivery to customers and deployment on test systems.
Create Kustomize manifests for microservices and develop the related automation, treating documentation as code for clarity and reproducibility.
Serve as technical advisor for the project's first go-live and oversee further deployments as technical rollout manager.
Ibrahim H.
Last position:
Senior Full Stack / AI Engineer at Punktum Digital GmbH
- Context: Healthcare and laboratory teams required faster document analysis, treatment-planning support, and reliable AI workflows for MR/VR-assisted operations.
- Contribution: Built the AI healthcare platform, model/agent workflows, VR-glasses deployment platform, REST APIs, Next.js/React interfaces, and CI/CD pipelines.
- Impact: Delivered a production-ready AI product foundation that improved clinical document review, supported laboratory automation, and made VR fleet deployment manageable across environments.
Tech: TypeScript, Next.js, Node.js, React, Java, Spring Boot, Python, PyTorch, TensorFlow, Docker, PostgreSQL, OpenAPI, GitLab, GitHub Actions.
Ursula R.
Last position:
Sabbatical with Training at Own Sabbatical
Qaiser A.
Last position:
Freelance Lead DevOps Engineer at Schwarz Gruppe Produktion
Bootstrapping a CloudOps team and building a multi-cloud provider backend for a low-code Internal Developer Platform (IDP) with env zero
Introducing user story mapping, ADRs, milestones, and backlog management
Designing and developing core APIs, setting up CI/CD pipelines, OpenTofu/Terraform scripts
Representing and communicating the team with third-party stakeholders (e.g. env zero)
(Cross-)team coaching on DevOps, software design, Terraform, Golang, and agile practices
Karthikeyan R.
Last position:
Full-Stack Developer — Own Product at Self-employed
Java 21 · Spring Boot 3 · Keycloak · PostgreSQL · Docker · Nginx · GitHub Actions · DigitalOcean · React 18 · TypeScript · Plasmo
- Architected and shipped a production-ready Job Application Tracker end-to-end: REST API with 5-stage workflow, pagination, sorting, and dynamic filtering — full ownership from design to live cloud deployment on DigitalOcean.
- Implemented production-grade identity management: OAuth 2.0 / OpenID Connect / JWT / RBAC via Keycloak, applying Hexagonal Architecture and DDD principles.
- Built automated CI/CD pipeline (GitHub Actions); containerised with Docker; Nginx reverse proxy with path-based routing and SSL termination.
- Developed a Chrome Extension (Plasmo framework, Manifest V3) that auto-fills job applications directly from LinkedIn into the tracker — demonstrates full product thinking across backend API and browser client.
Abhilasha S.
Last position:
Advisory Board at Intersteller Consulting GmbH
- Holds an advisory role in this startup on providing guidance on use of AI in product management to use Jira AI
- Working on real-world applications of AI tools like ChatGPT, Visual Studio, Augment, and Synthesia to enhance product management and user communication
Tobias J.
Last position:
Design of an AI-Agent-Based ERP System
- Design of an LLM-based agent system to control the ERP software
- Development of agent workflows with LangGraph and PydanticAI
- Planning interfaces between business logic and language models
- Planning agent orchestration
- Prototype development and demonstration
Tools: Python, Pydantic, React, LangChain, LangGraph, Linux
Maurizio F.
Last position:
Python Software Developer at Schönhofer Sales and Engineering GmbH
- Implemented a command line interface (CLI) for integration of REST APIs of various microservices for end users
- Centralized and simplified interaction with services through the CLI
- Implemented a REST microservice for custom data schemas based on an API-first approach
- Developed event-driven control with RabbitMQ to connect to other services
- Deployed services using Docker and Kubernetes and extended the CLI
- Managed complexity and data volume handling through the microservice
Discover over 15,000 top freelancers
Statistics of experts using Swagger
Aggregated from the professional profiles of matched freelancers.
Experience
16 years (Germany: 19 years)
Position duration
1.7 years
Positions per freelancer
10 (Germany: 14)
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Banking and Finance, Education
Certification focus areas
Information Technology, Product Development, Project Management
Bachelor's degree or higher
91% (Germany: 90%)
Master's degree or higher
32% (Germany: 54%)
Certifications per freelancer
3 (Germany: 2)
Most common languages
English, German, Turkish
Speak two or more languages
93% (Germany: 98%)
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 Berlin 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 Berlin 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 29 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 (96%)
- Banking and Finance (52%)
- Education (41%)
- Automotive (33%)
- Healthcare (33%)
- Media and Entertainment (30%)
- Government and Administration (30%)
- Retail (30%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
API contracts
Swagger is a set of tools for describing, documenting and testing HTTP APIs. Its specifications are now maintained under the OpenAPI name, while Swagger remains widely used for the tooling and workflow around them. A clear contract defines endpoints, parameters, authentication, responses and errors before implementation is complete.
Swagger tooling
The ecosystem includes Swagger UI for interactive documentation, Swagger Editor for authoring specifications and Swagger Codegen for generating client libraries or server stubs. SwaggerHub supports collaboration, governance and reusable API standards. Strong specialists also work with OpenAPI YAML or JSON, schema validation and API design rules.
Where it fits
Swagger appears in internal services, public APIs, partner integrations and mobile or web back ends. Typical deliverables include:
- OpenAPI specifications for new or existing services
- Interactive Swagger UI documentation
- Generated clients, server stubs and SDK foundations
- API examples, schemas, security definitions and error models
- Contract checks in CI pipelines
Why bring in specialists
Companies often need freelance expertise when an API is undocumented, several teams interpret its contract differently or a legacy service must be exposed safely. A specialist can review existing endpoints, establish naming and versioning rules, and align documentation with actual behavior. In Berlin, remote collaboration is common, while on-site workshops can help product, engineering and integration teams agree quickly.
Skills beyond Swagger
Effective work requires more than editing an OpenAPI file. Professionals understand REST principles, HTTP semantics, JSON Schema, OAuth 2.0, API keys and gateway policies. They may connect Swagger workflows with Postman, automated tests, Git, CI/CD systems and frameworks such as Spring Boot, Express or ASP.NET Core.
What quality looks like
A strong specialist keeps the contract accurate, readable and useful to its audience. They verify generated output against a running service, document realistic success and failure cases, and make breaking changes visible during review. They also choose carefully between generation and manual implementation, preserve backward compatibility and explain trade-offs clearly in English or German when teams in Berlin require both.
Frequently asked questions
Before you brief your next project: the most common questions about Swagger.
Companies use Swagger to describe HTTP APIs, publish interactive documentation and support testing or code generation. A well-maintained OpenAPI contract helps product, development, quality and integration teams work from the same definition.
Swagger is the established name for a family of API tools, including Swagger UI and Swagger Editor. OpenAPI is the specification maintained by the OpenAPI Initiative, so many teams use Swagger tools to create and present OpenAPI documents.
A strong Swagger specialist usually understands REST, HTTP, JSON Schema and API security such as OAuth 2.0 or API keys. Experience with Git, CI pipelines, contract testing, gateways and a back-end framework makes the documentation more reliable in production.
The right level depends on the scope. Swagger work for a single, well-defined service may need specification and documentation skills, while an organization-wide API program calls for experience with governance, versioning, compatibility and team adoption.
Yes. Swagger work is well suited to remote collaboration because specifications, reviews and generated artifacts can be managed in shared repositories. On-site workshops in Berlin can still be useful when several teams need to agree on API boundaries or standards.
Teams choose Swagger tooling when an API needs a consistent, reviewable contract and documentation that stays close to implementation. Manual pages may be sufficient for a small private service, but they become difficult to maintain as consumers, endpoints and release changes grow.
Review whether Swagger documentation matches live behavior, explains authentication and errors, and gives consumers usable examples. Ask the specialist to demonstrate validation, change review and generated output rather than judging the result by visual presentation alone.
A Swagger assignment can involve API discovery, specification design, documentation, client generation or integration into delivery pipelines. Freelancers should clarify the source of truth, target consumers, security model, review process and whether the team expects English, German or both in its documentation.
The average hourly rate of freelancers in Berlin, Germany who have used Swagger in their recent projects is 97 €, which corresponds to a daily rate of about 774 € based on an 8-hour working day.
Of the freelancers in Berlin, Germany who have used Swagger in their recent projects, 91% hold at least a Bachelor's degree and 32% hold at least a Master's degree.
On average, freelancers in Berlin, Germany who have used Swagger in their recent projects have 16 years of professional experience, with a single engagement typically lasting around 1.7 years.
The most common languages among freelancers in Berlin, Germany who have used Swagger in their recent projects are English (96%), German (85%), and Turkish (15%).
The most common industries among freelancers in Berlin, Germany who have used Swagger in their recent projects are Information Technology (96%), Banking and Finance (52%), and Education (41%).
The most common business areas among freelancers in Berlin, Germany who have used Swagger in their recent projects are Information Technology (100%), Product Development (96%), and Quality Assurance (70%).
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.
Hamburg 
Munich 
Cologne 
Frankfurt 
Stuttgart 
Dusseldorf Countries:
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FRATCH CEO
