OAuth Expert in Berlin
for secure access flows, matched in minutes with vetted freelance specialistsHire experts who design authorization flows, integrate OpenID Connect and secure API access across web and mobile products. FRATCH matches you quickly and precisely with vetted, available freelancers for your OAuth project.
Meet FRATCH Experts in Berlin, who have recently used OAuth
Alois R.
Last position:
Senior Fullstack Developer at brandung GmbH
- Opt-in RAG extension over tenant-owned data sources (SharePoint, Confluence) on existing multi-tenant enterprise AI platform
- Architecture: ADRs, solution evaluations, permission strategy, cost modeling
- End-to-end SharePoint and Confluence connectors: OAuth consent flows, token refresh, metadata sync, search integration
- Permission resolution: ACL indexing at ingestion and query-time verification (document-level security)
- Elasticsearch hybrid search (semantic + keyword) with RRF scoring
- RAG chat with context injection and source citations
- Stack: Elastic Cloud, Elasticsearch, Docker, Northflank, Next.js, React, TypeScript, Prisma, Microsoft Graph API, Atlassian REST API, OAuth 2.0
Imran A.
Last position:
Software Engineer II at LivePerson Germany GmbH
- Led development of 15+ microservices (Java 17, Spring Boot) driving customer interactions; migrated from on-prem to GCP Kubernetes, improving scalability and reducing infra cost by 20%.
- Optimized user services with CouchDB caching and API refactoring, cutting response times by 35% and enhancing customer experience.
- Implemented canary deployments, FluxCD GitOps, and CI/CD optimizations in GitLab, reducing release lead time by 25% and enabling zero-downtime rollouts.
- Set up Grafana health checks and Anodot alerts for latency, error, and throughput monitoring, reducing MTTR by 40%.
- Built secure APIs using OAuth2, DPoP, and Gatekeeper, integrated REST and GraphQL, and achieved 90%+ test coverage with unit and E2E tests.
- Mentored junior developers, promoted Agile best practices, and collaborated cross-functionally to deliver high-impact, reliable customer-facing features.
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.
Jorge P.
Last position:
Software Engineer – AWS and Kubernetes Specialist at Citti
- Creation, maintenance and hardening of Kubernetes clusters employing Ansible and ArgoCD
- Keywords: Ansible, AWX, Kubernetes, NetApp, Prometheus, CI/CD ArgoCD, SSO, Fluent-bit, HAProxy, Calico, Keycloak, oauth2-proxy, SealedSecrets, kubeseal, Aqua kube-bench, CIS-Benchmarks, Aqua Trivy operator
Marvin M.
Last position:
Co-founder & CTO · Freelance Software Engineer (AI & SaaS) at Self-employed
- Self-employed · Berlin, Germany
- Co-founded the company and own the entire technical side: product architecture, backend, frontend, infrastructure and operations.
- Designed and built the Automated Booking System (ABS) as well as the core platform and payment logic.
- Development of AI-powered SaaS products, from architecture through backend and frontend to production operation.
- Technical consulting on product architecture, data protection and permissible automation.
- Building, running and monetising my own API products for AI agents, each available as a REST interface and as an MCP server.
- Full ownership of architecture, infrastructure, billing, legal texts and go-to-market.
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.
Ola V.
Last position:
IT Lecturer
- IT training in theory and practice for IT specialists in application development and system integration
Marcus B.
Last position:
Alpecin.de - Dr. Wolff Group
- Development of a Component Library based on a Design System for several international brands such as Alpecin, Karex, Linola and Plantur 39
- Integration of Headless CMS, PIM and Commerce solutions
- UI/UX development
- Prototype development
- MVP development
- API design and development
- SaaS development (Whitelabel/Multi-tenent)
- Headless CMS integration
- Design Systems Digital Signage
- Internationalization (i18n)
- Javascript
- Component Library
- Tailwind CSS
- Storybook
- HTML
- Vue 3
- Storyblok
- Github Actions
- SEO
- i18n Theming
- React
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
Mario J.
Last position:
Architect / Developer at handyhase
- Overhaul of the entire design and implementation of new UI/UX aspects using React
- Planning of the software architecture and structuring of the project for long-term scalability using Git for version control
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.
Discover over 15,000 top freelancers
Statistics of experts using OAuth
Aggregated from the professional profiles of matched freelancers.
Experience
17 years (Germany: 19 years)
Position duration
2.2 years (Germany: 1.8 years)
Positions per freelancer
12 (Germany: 14)
Top business areas
Information Technology, Product Development, Quality Assurance
Top industries
Information Technology, Education, Banking and Finance
Certification focus areas
Information Technology, Product Development, Project Management
Bachelor's degree or higher
95% (Germany: 87%)
Master's degree or higher
36% (Germany: 51%)
Certifications per freelancer
2
Most common languages
German, English, Spanish
Speak two or more languages
100% (Germany: 97%)
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 OAuth
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.
OAuth 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%)
- Education (54%)
- Banking and Finance (43%)
- Healthcare (36%)
- Manufacturing (36%)
- Media and Entertainment (36%)
- Retail (32%)
- Automotive (29%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
Authorization basics
OAuth is an authorization framework for granting limited access to protected resources without sharing a user’s password with another application. It separates the resource owner, client, authorization server and resource server, using access tokens and defined scopes. Strong implementations also plan token storage, expiration, revocation and consent clearly.
Where OAuth fits
OAuth supports delegated access in SaaS products, mobile applications, partner portals and machine-to-machine API integrations. It is often paired with OpenID Connect when a product also needs user authentication and identity claims.
- Connect web or mobile clients to protected APIs
- Add social login and enterprise identity providers
- Secure partner access with scopes and consent
- Protect service integrations and background processes
Ecosystem and tooling
Professionals work with authorization servers, identity providers and API gateways that implement OAuth and OpenID Connect. Common tasks include configuring clients, redirect URIs, scopes, claims, signing keys and token validation. They may also use libraries for JavaScript, Java, .NET, Python, Go or PHP, alongside standards documentation and security testing tools.
When specialists help
Companies bring in freelance expertise when an existing login flow must be replaced, an API needs delegated access or several identity providers must work together. Berlin teams may value specialists who can collaborate remotely across time zones or join on-site workshops when architecture and security decisions require close coordination.
- Review an insecure or inconsistent authorization design
- Migrate from custom tokens to a standards-based flow
- Integrate an enterprise identity provider
- Prepare an API for external partners
Skills that matter
A capable OAuth specialist understands browser security, HTTP, TLS, cookies, sessions and API design. They can distinguish authentication from authorization and select the right flow for the client type instead of copying a generic setup. Experience with threat modeling, key rotation, logging, consent screens and failure handling is equally important.
Quality and delivery
Good work begins with a clear access model: who can request which resource, under what conditions and for how long. Strong professionals document scopes and trust boundaries, validate tokens at the correct service boundary and test redirect handling, replay risks and revoked access. They leave maintainable configuration, useful runbooks and a practical path for future identity changes.
Frequently asked questions
Need clarity? These are the questions we hear most often about OAuth.
OAuth lets an application obtain limited access to a protected API on a user’s or service’s behalf without receiving the user’s password. It is commonly used for delegated access, partner integrations, mobile applications and SaaS connections.
OAuth is primarily about authorization: granting access to resources through tokens and scopes. OpenID Connect builds on OAuth to provide an identity layer, so an application can verify who the user is and receive standardized identity claims.
A strong OAuth specialist should understand API security, HTTP, TLS, cookies, sessions and browser security. Experience with OpenID Connect, identity providers, API gateways, JWT validation, key management and threat modeling is also valuable.
The right level depends on the risk and scope of the work. A focused client integration may need a specialist who can configure and test an existing provider, while a shared identity architecture or migration benefits from deep security design and production troubleshooting experience.
Yes. OAuth projects usually work well remotely when documentation, access boundaries and test environments are clear. On-site workshops in Berlin can still help when several teams must agree on identity ownership, consent, scopes and operational responsibilities.
A company should be cautious about building an OAuth authorization server when a maintained identity provider already meets its needs. Custom implementations create responsibility for protocol details, key handling, consent, recovery, security updates and operational monitoring.
Ask the specialist to explain the authorization flows, trust boundaries, scopes and token lifecycle in plain language. Review whether the implementation separates authentication from authorization, validates tokens correctly, handles revocation and failure cases, and includes security tests and clear documentation.
OAuth is often evaluated alongside OpenID Connect, signed API keys, mutual TLS and service-specific credentials. The choice depends on whether the system needs delegated user access, user identity, service authentication, fine-grained scopes or a simpler controlled integration.
The average hourly rate of freelancers in Berlin, Germany who have used OAuth in their recent projects is 86 €, which corresponds to a daily rate of about 688 € based on an 8-hour working day.
Of the freelancers in Berlin, Germany who have used OAuth in their recent projects, 95% hold at least a Bachelor's degree and 36% hold at least a Master's degree.
On average, freelancers in Berlin, Germany who have used OAuth in their recent projects have 17 years of professional experience, with a single engagement typically lasting around 2.2 years.
The most common languages among freelancers in Berlin, Germany who have used OAuth in their recent projects are German (100%), English (100%), and Spanish (14%).
The most common industries among freelancers in Berlin, Germany who have used OAuth in their recent projects are Information Technology (96%), Education (54%), and Banking and Finance (43%).
The most common business areas among freelancers in Berlin, Germany who have used OAuth in their recent projects are Information Technology (100%), Product Development (100%), and Quality Assurance (61%).
Main locations of FRATCH Experts, who have recently used OAuth
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 
Dortmund Request a free demo
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Philipp Thomaschewski
FRATCH CEO
