Swagger Expert in Berlin
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Meet FRATCH Experts in Berlin, who have recently used Swagger
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
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.
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.
Toralf C.
Last position:
IT Consultant in PKI Software Development at BWI
- Implementation of a full-stack application with Angular as the frontend framework and Java as the backend language
- Use of the Swagger OpenAPI specification for REST communication between the frontend and backend applications
- Control of a card printer via the Nexus Card SDK framework
- Design and implementation of card management software with a web interface and a JavaFX module for printer monitoring
- Use of Cucumber tests for test automation and creation of test artifacts to test outside the development environment
- Use of Wireshark for network investigations to analyze the API of a third-party product and to monitor the REST API of the self-developed software
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
Domenik J.
Last position:
Python Engineer and Cloud Migration Consultant at Unknown
- Supported the company's transition from an on-premise architecture to AWS cloud services, modernizing infrastructure and optimizing operational efficiency.
- Leveraged expertise in automation and software implementation to enhance scalability, reliability and profitability.
- Implemented Poetry and Ruff to streamline Python dependency management and code quality checks, improving development efficiency and reducing errors.
- Implemented an automated CI/CD strategy with GitHub Actions, which decreased deployment times and minimized manual intervention.
- Enforced deployment automation for Kubernetes, enhancing the scalability and reliability of applications across the organization.
- Evaluated and implemented Apache Airflow for workflow management, leading to more efficient scheduling and monitoring of data pipelines.
- Created data interfaces for energy traders, enabling them to optimize profit margins through improved data analysis and decision-making tools.
Fikret A.
Last position:
Senior Product Manager at Enocta
- Executing the roadmap for LMS/LXP platform with 550+ enterprise clients and 4+ million users
- Led the 0-to-1 development of a conversational AI role-play product with the AI team
- Led GTM for the AI Roleplay, creating a new ARR stream, acquiring 15+ enterprise customers in Q1
- Led the development & GTM of a conversational AI Mentor product
- Serving on the strategic leadership team, contributing to long-term product and business strategy
Mohamed K.
Last position:
Interim Senior Camunda & BPMN Consultant, Spring Boot & Java Backend Developer at GEMA/IT4IPM GmbH
- Subject matter expert for the client on modeling and developing Camunda BPMN 2.0
- Development of new features and APIs, and coordination of tasks
- Design and development of RESTful APIs with Swagger (code first)
- Creation of target designs, high-level concepts, and requirement specifications
- Analysis and evaluation of alternative solution approaches
- Integration of external IT systems (ANUBIS, SES, ZPS) via Google GCP Pub/Sub and RESTful web services
- Pair programming, code reviews, and collaboration with API product owners
- Consulting on transforming legacy BPMN workflows and configuring Camunda BPM
- BPMN and DMN modeling and implementation in short iterations
- Operational support, bug fixing, and knowledge documentation
- Use of TDD, static code analysis with SonarQube, and integration tests
- Automation of test cases in Java and analysis of stack traces/logs on GCP-PROD
- Identification and execution of test data and documentation of test results
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
Discover over 15,000 top freelancers
Statistics of experts using Swagger
Aggregated from the professional profiles of matched freelancers.
Experience
15 years (Germany: 19 years)
Position duration
1.6 years (Germany: 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
95% (Germany: 90%)
Master's degree or higher
30% (Germany: 55%)
Certifications per freelancer
2
Most common languages
English, German, Turkish
Speak two or more languages
92% (Germany: 98%)
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 Berlin 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 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 19 Sep 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%)
- Banking and Finance (56%)
- Education (40%)
- Automotive (36%)
- Healthcare (36%)
- Media and Entertainment (32%)
- Government and Administration (32%)
- Retail (28%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
What Swagger does
Swagger is a set of tools for describing, documenting and testing REST APIs. Its specifications and interfaces help teams define endpoints, request parameters, authentication, response formats and error behavior in a shared, machine-readable contract. The project is now closely associated with the OpenAPI Specification.
Core tools and ecosystem
Swagger tooling supports the full API lifecycle, from contract design to interactive documentation. Common components include Swagger Editor for authoring, Swagger UI for browser-based exploration and Swagger Codegen for generating client libraries or server stubs. Specialists also work with OpenAPI Generator, Postman, JSON or YAML, and API gateways.
- Create and validate OpenAPI definitions
- Publish interactive Swagger UI documentation
- Generate clients, models or service stubs
- Connect API contracts to CI pipelines
Where companies use it
Companies use Swagger for internal services, public APIs, mobile backends and integrations between business systems. It is useful in finance, health, retail, logistics and software products where several teams or external partners need a reliable interface reference. Berlin-based teams may also need experts who can collaborate on-site, remotely or in English and German.
When freelance expertise helps
Freelance specialists are valuable when an API needs a clear contract before implementation, when outdated documentation blocks integration, or when an organization is standardizing many services. They can audit existing definitions, migrate older Swagger formats to OpenAPI, introduce review rules and align documentation with deployed behavior.
- Resolve mismatches between specification and API responses
- Establish reusable schemas, security schemes and conventions
- Automate validation and documentation publishing
- Prepare partner-facing API references
Skills around Swagger
Strong professionals understand HTTP, REST design, JSON, YAML and authentication methods such as OAuth 2.0 or API keys. They may also bring experience with Java, Spring Boot, Node.js, .NET, Python or API gateways, depending on the service landscape. Useful adjacent skills include contract testing, versioning, semantic validation and CI/CD integration.
What quality looks like
Good Swagger work reflects the real API and remains understandable to people and tools. Schemas use consistent names, precise types, examples and meaningful error responses; security requirements are explicit, and breaking changes are visible. A capable specialist also checks generated output, tests representative requests and leaves maintainable guidance for the team.
For a Berlin engagement, assess how clearly the professional explains trade-offs between design-first and code-first workflows. Ask for evidence of API reviews, migration work or documentation used by real consumers, not only a polished interface. The strongest fit can communicate contract decisions and improve adoption across technical and non-technical stakeholders.
Frequently asked questions
Before you brief your next project: the most common questions about Swagger.
Swagger is used to describe, document and explore REST APIs through a machine-readable contract and interactive interfaces. Teams use it to align service producers and consumers, validate requests and responses, and make integration work easier.
Swagger is the name historically used for the specification and its supporting tools, while OpenAPI is the current specification name. Swagger UI, Swagger Editor and related products continue to work with OpenAPI definitions, so a specialist should understand both terms.
A company should bring in a Swagger specialist when API contracts are inconsistent, documentation is out of date or several teams need a shared integration standard. Freelance expertise can also help with a migration to OpenAPI, generated clients, contract testing or automated publishing.
A strong Swagger professional usually understands HTTP, REST, JSON, YAML, authentication and API versioning. Experience with tools such as Swagger UI, Swagger Editor, OpenAPI Generator, Postman and CI/CD systems is useful, as are skills in the language or framework behind the API.
The need depends on the API landscape rather than a fixed duration of experience. A focused documentation update may need a specialist who can work within existing conventions, while a company-wide contract standard requires experience with governance, migrations, security schemes and cross-team reviews.
Yes. Swagger work is well suited to remote collaboration because API definitions, pull requests, CI checks and review comments provide a clear shared workspace. Berlin teams should agree on documentation ownership, meeting overlap and whether communication is expected in English, German or both.
Swagger focuses strongly on the API contract and generated or interactive documentation, while Postman is often centered on request collections, exploratory calls and workflow testing. The tools can complement each other, and the right choice depends on whether the main need is design governance, testing, documentation or a combination.
Review whether the Swagger or OpenAPI definition matches live behavior, uses consistent schemas and explains successful and failed responses clearly. Ask the professional to demonstrate validation, security handling, versioning and how documentation or generated clients are checked in the delivery process.
The average hourly rate of freelancers in Berlin, Germany who have used Swagger in their recent projects is 94 €, which corresponds to a daily rate of about 749 € based on an 8-hour working day.
Of the freelancers in Berlin, Germany who have used Swagger in their recent projects, 95% hold at least a Bachelor's degree and 30% hold at least a Master's degree.
On average, freelancers in Berlin, Germany who have used Swagger in their recent projects have 15 years of professional experience, with a single engagement typically lasting around 1.6 years.
The most common languages among freelancers in Berlin, Germany who have used Swagger in their recent projects are English (96%), German (84%), and Turkish (12%).
The most common industries among freelancers in Berlin, Germany who have used Swagger in their recent projects are Information Technology (100%), Banking and Finance (56%), and Education (40%).
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 (72%).
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 Stuttgart Dusseldorf Leipzig Dortmund Essen Bremen Dresden Hanover Nuremberg 
Hamburg 
Munich 
Cologne 
Frankfurt 
Dusseldorf Countries:
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Philipp Thomaschewski
FRATCH CEO
