OpenAPI Experts in Switzerland
for reliable APIs, matched in minutes with vetted freelance specialistsHire experts who define API contracts, maintain OpenAPI specifications and connect REST services with tools such as Swagger UI, Postman and code generators. FRATCH matches you quickly and precisely with vetted, available freelancers.
Meet FRATCH Experts in Switzerland, who have recently used OpenAPI
Urs S.
Last position:
CargoMonitor App at MSR Electronics GmbH
MVP app for shock logger to monitor and analyze transport data via BLE as a Kotlin Multiplatform solution for Android and iOS.
Christoph P.
Last position:
ICT DevSecOps Engineer & Security Coordinator at Abraxas Informatik AG
- Interface role with the SOC team; improved incident response time by 45% through structured escalation processes and proactive security monitoring.
- Defined technical standards for a multi-tenant enterprise platform (10+ services), resulting in a 30% shorter onboarding time for new clients in the public sector.
- Active knowledge transfer and mentoring of a 6-person team; increased team autonomy and established a sustainable engineering culture.
- Reduced time to market by 50% by optimizing CI/CD pipelines and establishing self-service deployments.
- Stack: GitLab CI/CD, Kubernetes, Nexus, Harbor, ArgoCD, HashiCorp Vault, Grafana, Python, PostgreSQL, Java, Spring Boot, Flyway, Quarkus, JBoss, Loki, Go, Kafka, Kustomize, MongoDB
Robin O.
Last position:
Co-Founder & AI Solutions Architect at airdys
- Product strategy, architecture, and technical co-direction
- AI workshops, client onboarding and go-to-market activities
- Design and implementation of AI architectures (LLMs, RAG, MCP, agents, voice, automation)
- Hands-on development of prototypes and production-ready AI integrations
- Consulting clients on AI adoption, workflows, and integration into existing infrastructure
- Collaboration with co-founders on strategic direction
- Collaboration in sales and customer acquisition
Tools and Technologies: OpenAI, Anthropic, Azure, Vercel AI SDK, RAG (Retrieval-Augmented Generation), MCP (Model Context Protocol), FastAgent, VAPI, n8n, make.com, LibreChat, PostgreSQL, OpenAPI, Next.js, Vercel, Docker
Mathias D.
Last position:
Independent contractor at Allianz-Technology
- Developed a large web application for second-pillar retirement insurance (Swiss BVG, Kollektivleben) with over 1000 web pages, using an in-house modeling language and Angular for the front end and back end
- Fixed bugs in the code generator and enhanced and re-engineered the application
- Built an automated testbed
- Implemented PDF document generation with XML and Thunderhead
- Resolved issues caused by the switch to Java 21
- Replaced middleware server for insurance base data (customers, contracts) using Java/Spring, REST, OpenAPI, Docker, Kubernetes, OpenShift, Azure CI/CD pipeline, Jenkins, and GitHub
Christoph J.
Last position:
Project management, Software engineering, Software architect, DevOps at Migros Genossenschafts Bund
- Greenfield project M-Zollmanager: Development of an internal platform to support users in booking requirement areas on line items in assessment notices.
- Greenfield project M-Deliveryplan: Development of an internal platform for planning and tracking deliveries in the international transport sector.
- Created functions to predict the estimated arrival time of container ships and goods from the port of loading to the port of destination, considering potential events.
- Developed the TrackAndTrace add-on for M-Deliveryplan to track and plan goods and containers.
- Built a generic AI chatbot for Migros app infrastructure, including ChatGPT integration and creating AI workflows with N8N.
- Developed AI assistants to automate repetitive tasks, such as creating release notes or processing Jira tasks based on N8N workflows.
- Further development and maintenance of the M-LFS, M-Vehicleaccess and M-Worklog apps.
- Used C#, Angular 18, DevOps practices, N8N, Kubernetes, Docker, Jira, Confluence and Azure.
- Ongoing project with continuous development of platforms and workflows.
Georgios S.
Last position:
Senior Software Engineer at UBS Bank
- Implementations of a code refactoring framework able to refactor thousands of repositories leveraging Generative AI
- Use Python (Django, Flask, FastAPI), Java and Typescript in Azure Cloud (Data Lake, VMs, AI) and GitLab infrastructure
- Mentoring and pair programming
- Obtained Azure AI-900 and AI-102 certifications
Jack S.
Last position:
Freelance - Fullstack Engineer at SMG Swiss Marketplace Group
- Supported the team in merging two real estate platforms into a unified Vue.js-based solution
- Developed a custom SSR microservice architecture deployed on AWS Lambdas
- Designed and implemented a map drawing feature
- Took ownership of migrating the microservice from Vue 2 to Vue 3
- Built a scalable SSR microservice architecture using AWS Lambda
- Developed and implemented a critical map drawing feature for real estate visualization
- Successfully migrated the microservice from Vue 2 to Vue 3
- Gained deep knowledge of AWS infrastructure, Datadog, Sentry, and Vite
- Technologies: Vue.js, Node.js, Vite, AWS Lambda, Datadog, Sentry, JavaScript
Thomas M.
Last position:
Developer/Analyst at Nvaria GmbH
- Analyzed migration strategies after Camunda 7 was declared end of life with extended support until 2030.
- Evaluated potential migrations to Camunda 8, Flowable, and Operaton.
- Conducted a proof of concept demonstrating that existing projects could be migrated to both Flowable and Operaton.
- BPMN
- DMN
- Confluence
- Flowable
- Operaton
Felix S.
Last position:
Senior iOS Developer at Commerzbank AG
- The comdirect app for iOS offers an intuitive and user-friendly mobile banking app that allows users to manage their banking efficiently and securely.
- Central features: bank transfers, portfolio analysis, personalized financial manager to facilitate daily banking and financial planning.
- Users: over 1 million.
- Written in native Swift using UIKit and SwiftUI.
- App-wide MVVM and Coordinator design pattern.
- Partial reactive programming using Apple’s Combine framework or vendor RxSwift.
- API integrations and data structures with JSON.
- Documented clean code.
- Continuous integration with Git and Jenkins.
- High unit test coverage with XCTest.
- Agile project setup according to Scrum.
Ferran S.
Last position:
Senior Software Engineer at Personal time off / Private projects
- Took on and completed private/organizational projects.
- Continued self-training, e.g., in cloud and reactive architectures.
- Focused deepening of knowledge in areas like Kafka and modern Java 17 enterprise architectures.
Discover over 15,000 top freelancers
Statistics of experts using OpenAPI
Aggregated from the professional profiles of matched freelancers.
Experience
18 years
Position duration
1.2 years
Positions per freelancer
18
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Banking and Finance, Insurance
Certification focus areas
Information Technology, Business Intelligence, Product Development
Bachelor's degree or higher
100%
Master's degree or higher
38%
Doctorate
25%
Certifications per freelancer
2
Most common languages
German, English, Spanish
Speak two or more languages
100%
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 Switzerland 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 Switzerland 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 29 Oct 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 (80%)
- Insurance (60%)
- Energy (50%)
- Media and Entertainment (50%)
- Professional Services (50%)
- Retail (50%)
- Healthcare (40%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
OpenAPI explained
OpenAPI is a standard for describing HTTP APIs in a machine-readable format. An OpenAPI document records endpoints, parameters, request bodies, responses, authentication and data schemas in YAML or JSON. Teams use it as a shared contract before and during implementation.
What it enables
OpenAPI supports consistent API design across internal services, partner integrations and public products. It can power documentation, validation, mock servers, test cases and client or server code generation. The specification helps product, security and delivery teams work from the same interface definition.
Ecosystem and tooling
The ecosystem includes Swagger UI and Swagger Editor, along with Redoc, Postman and API gateways that import or validate specifications. Strong specialists also work with JSON Schema, REST conventions, OAuth 2.0, OpenID Connect and CI pipelines that detect breaking contract changes.
- Create and refine YAML or JSON specifications
- Generate interactive documentation and client libraries
- Validate requests, responses and schema changes
- Connect API contracts to testing and deployment workflows
When expertise matters
Companies often bring in freelance expertise when an API needs a clear contract, when several teams must coordinate, or when legacy endpoints require structured documentation. A specialist can also support a migration from handwritten documentation, establish review rules or prepare an API for external partners. In Switzerland, remote collaboration can work well across distributed product teams, while on-site workshops may help with complex domain decisions.
Skills to look for
A capable OpenAPI professional understands API lifecycle management rather than treating the specification as a static document. Look for experience with versioning, backward compatibility, error models, pagination, security schemes and automated contract checks. Clear communication matters because the document must serve both technical and non-technical stakeholders.
Choosing the right specialist
Review examples of complete specifications, not only isolated endpoint lists. Ask how the specialist handles reusable components, inconsistent legacy behavior and changes that affect existing consumers. The best fit can explain trade-offs between design-first and code-first approaches, align documentation with the real service and leave maintainable workflows behind.
Frequently asked questions
Before you brief your next project: the most common questions about OpenAPI.
OpenAPI describes the contract of an HTTP API, including its operations, inputs, outputs, schemas and security requirements. Companies use it to create documentation, validate traffic, generate test assets and coordinate teams building or consuming REST services.
OpenAPI documents HTTP APIs and is commonly associated with REST, where endpoints and representations define the interface. GraphQL uses a query schema, while gRPC uses protocol buffers and remote procedure calls; the right choice depends on client flexibility, transport needs and the existing ecosystem.
An OpenAPI specialist should understand REST design, JSON Schema, HTTP behavior and API security. Useful adjacent skills include OAuth 2.0, OpenID Connect, Postman, Swagger UI, API gateways, automated testing and CI validation.
The right OpenAPI experience depends on the scope, not simply on the size of the specification. A focused documentation task may need a short engagement, while a multi-team contract, governance model or legacy migration requires deeper experience with versioning and compatibility.
Yes, OpenAPI work is well suited to remote collaboration because specifications, reviews and validation rules are shared digitally. On-site sessions in Switzerland can still be useful for domain workshops, security reviews or alignment between product and technical stakeholders.
OpenAPI is the current name of the open specification maintained by the OpenAPI Initiative. Swagger is the former name of the specification and remains widely used for tools such as Swagger UI, Swagger Editor and Swagger Codegen.
A strong OpenAPI specification is complete, consistent and understandable without relying on tribal knowledge. Check whether examples match schemas, errors are defined, security rules are explicit, reusable components are used appropriately and automated checks protect consumers from accidental breaking changes.
With OpenAPI design-first work, the contract is reviewed before implementation and can guide mocks, documentation and parallel delivery. Code-first work derives the specification from implementation; it can be practical for existing services, but teams must verify that the generated document accurately reflects real behavior.
The average hourly rate of freelancers in Switzerland who have used OpenAPI in their recent projects is 106 €, which corresponds to a daily rate of about 845 € based on an 8-hour working day.
Of the freelancers in Switzerland who have used OpenAPI in their recent projects, 100% hold at least a Bachelor's degree, 38% hold at least a Master's degree, and 25% hold a doctorate.
On average, freelancers in Switzerland who have used OpenAPI in their recent projects have 18 years of professional experience, with a single engagement typically lasting around 1.2 years.
The most common languages among freelancers in Switzerland who have used OpenAPI in their recent projects are German (100%), English (100%), and Spanish (40%).
The most common industries among freelancers in Switzerland who have used OpenAPI in their recent projects are Information Technology (100%), Banking and Finance (80%), and Insurance (60%).
The most common business areas among freelancers in Switzerland who have used OpenAPI in their recent projects are Information Technology (100%), Product Development (100%), and Quality Assurance (60%).
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.
Zurich Request a free demo
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Philipp Thomaschewski
FRATCH CEO
