OpenAPI Experts in Switzerland
in minutes from over 15,000 CVs with the power of AIHire experts who define API contracts, keep Swagger and OpenAPI specs clean, and document endpoints for teams and partners. Get fast, precise matching with vetted, available freelancers.
Meet FRATCH Experts in Switzerland, who have recently used OpenAPI
Urs Steger
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 Pardon
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 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% through CI/CD pipeline optimization and the introduction of 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
Osman Tartoussi
Last position:
Senior Developer and Consultant at Federal Office for IT and Telecommunications BIT
IT consulting, analysis, architecture design, new and further development, code review, test automation, continuous integration and continuous delivery in the backend and frontend area.
Technology stack:
JAVA 21
Spring Boot 3
Spring Framework 6
Spring Rest
Spring Data
JPA
Postgres
Aurora Database
Typescript
OWASP
Renovatebot
Sonarqube
Prometheus
Grafana
Spring Security
Single SignOn
Keycloak
Angular 19
NgRx Redux
AWS ECS
AWS Cloudwatch
Terraform
Spacelift
GitOps
Docker
Junit
Maven
Jenkins Pipeline
GitHub
BitBucket
Nexus
Kafka
Conduktor
Kafdrop
OpenApi
Swagger
Scrum
SAFe
Jira
Confluence
Robin Ochsner
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
Thomas Müllerleile
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 Schmidt
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.
Georgios Sfakianakis
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
Mathias Dürrenberger
Last position:
Independent contractor at Allianz-Technology
- Developed a massive web application for second pillar retirement insurances (Swiss BVG, Kollektivleben) with over 1000 web pages using an in-house model language and Angular for 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 due to 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
Ferran Siles Vila
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.
Jack Schmidt
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
Christoph Janik
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.
Discover over 15,000 top freelancers
Statistics of experts using OpenAPI
Aggregated from the professional profiles of matched freelancers.
Experience
18 years
Position duration
1.1 years
Positions per freelancer
17
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 30 Aug 2026.
Daily rate distribution
The chart shows how the daily rates of freelancers in this technology in Switzerland 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 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 30 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
About the technology
API contracts
OpenAPI is the standard way to describe REST APIs in a machine-readable format. Teams use it to define endpoints, request and response bodies, auth, and error handling before or alongside implementation. That keeps backend, frontend, and partner teams aligned.
Typical work
- Write and refine OpenAPI 3 specs
- Review existing Swagger files and fix gaps
- Turn API designs into clear documentation
- Keep specs in sync with changing services
- Support contract-first API delivery
Tooling and ecosystem
Strong specialists work with Swagger UI, Swagger Editor, Redoc, and code generators that turn specs into clients or server stubs. They also know YAML, JSON, versioning, authentication schemes, and validation in CI pipelines. This helps keep the API description useful after the first release.
When teams bring help
Companies usually need freelance OpenAPI expertise when a platform has grown messy, partner integrations are blocked, or documentation no longer matches the real API. In Switzerland, this often comes up in finance, insurance, logistics, and SaaS teams that need clean handoffs and exact language across distributed work.
What strong experts do
A strong professional does more than write schema fields. They spot ambiguous names, inconsistent error models, missing security details, and paths that are hard to use. They think about the full lifecycle: design, review, implementation, testing, and future change.
Good fit for projects
OpenAPI is a good fit when a company needs one source of truth for REST services, partner-facing APIs, or internal service contracts. It also helps when teams want better onboarding, stronger documentation, and safer automation around release checks. For remote collaboration, clear specs and review notes matter more than location.
Frequently asked questions
Before you brief your next project: the most common questions about OpenAPI.
OpenAPI is used to describe REST APIs in a way both people and tools can read. It defines paths, parameters, request bodies, responses, security, and error cases. Teams use it to align implementation and documentation.
OpenAPI is the current specification name, while Swagger is the older name many people still use in practice. Today, Swagger tools such as Swagger UI and Swagger Editor are common ways to work with OpenAPI files. When people say Swagger, they often mean the spec, the tooling, or both.
A strong OpenAPI specialist can write clean specs, review existing files, and spot mismatches between documentation and code. They should also understand versioning, authentication, and how specs fit into delivery workflows. Good specialists make APIs easier to consume and safer to change.
OpenAPI work often goes with REST design, YAML, JSON, CI checks, and API testing. Many specialists also know code generation, contract-first development, and documentation tools like Redoc or Swagger UI. Security schemes and versioning are part of the job as well.
That depends on the state of the API. A small cleanup may need someone who can fix the spec and improve documentation, while a larger redesign needs deeper experience with API governance and review. For complex systems, look for someone who has shipped specs in production, not just written examples.
Bring in OpenAPI help when the team is too busy, the API is already inconsistent, or partner integrations depend on accurate contracts. Freelancers are also useful when you need a short, focused effort to standardize documentation or create a spec for a new service. In Switzerland, this is often practical for distributed product teams that work in English.
A good OpenAPI file is precise, readable, and aligned with the live API. Check whether names are consistent, error responses are complete, auth is clear, and examples are useful. If other teams can build against it without guesswork, the spec is doing its job.
Yes. OpenAPI is especially useful for remote work because it gives everyone one shared contract to review. On-site workshops can help at the start, but the spec itself supports async review, comments, and change tracking across teams in different places.
The average hourly rate of freelancers in Switzerland who have used OpenAPI in their recent projects is 105 €, which corresponds to a daily rate of about 840 € 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 1.1 years.
The most common languages among freelancers in Switzerland who have used OpenAPI in their recent projects are German (100%), English (100%), and Spanish (36%).
The most common industries among freelancers in Switzerland who have used OpenAPI in their recent projects are Information Technology (100%), Banking and Finance (73%), and Insurance (64%).
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 (64%).
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
Get in touch with the FRATCH team and we will get back to you within 4 hours.
Would you rather directly get in touch?
We always have the time for a call or email!
Philipp Thomaschewski
FRATCH CEO
