OAuth Experts in Berlin
matched in minutes by AIHire experts who design secure authorization flows, integrate OAuth 2.0 and OpenID Connect, and connect identity providers with web, mobile and API systems. FRATCH matches you quickly with vetted, available freelancers who fit your technical needs.
Meet FRATCH Experts in Berlin, who have recently used OAuth
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
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
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.
Ola V.
Last position:
IT Lecturer
- IT training in theory and practice for IT specialists in application development and system integration
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.
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-tenant)
- 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
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
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.
Julien L.
Last position:
MLOps Engineer at SAMGEN
- Building and scaling cloud infrastructure on GCP to support a SaaS platform for industrial clients
- Designing and implementing a data-driven DevOps pipeline for streamlined deployment and CI/CD workflows
- Collaborating with Data Science team on MLOps workflow to automate integrated retraining
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
Daniel S.
Last position:
Frontend and Web Developer at Datalyze Solutions
- Frontend development and implementation of various designs (landing pages, overview pages)
- Responsible for the content and updates of the Datalyze Solutions company website
- Joint planning and development of an admin application for listing and locating real estate projects (CBRE)
- Joint planning and development of extensive solutions for automatic staff allocation in plants (Bosch)
- Backend development of various small projects with different stacks
- Tech stack: GitLab CI/CD, Elixir, Phoenix Framework, Ecto, PostgreSQL, Docker, Hetzner, Traefik, NGINX, Python, Flask, Next.js/React, Leaflet, GeoServer, TypeScript, MongoDB
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 years (Germany: 1.7 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
100% (Germany: 87%)
Master's degree or higher
37% (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 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 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 19 Sep 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 (100%)
- Education (52%)
- Banking and Finance (44%)
- Healthcare (40%)
- Media and Entertainment (40%)
- Manufacturing (36%)
- Automotive (32%)
- Professional Services (32%)
Please note that freelancers can work across multiple industries, so percentages overlap.
About the technology
Authorization foundations
OAuth is an authorization framework for granting limited access to resources without sharing a user’s password with another application. OAuth 2.0 is the version most teams use today, with access tokens, scopes, consent and redirect flows at its core. It supports delegated access for web apps, mobile clients, partner integrations and service APIs.
Identity and access
OAuth answers what an application may access, while authentication confirms who the user is. OpenID Connect adds an identity layer on top of OAuth 2.0 through ID tokens and user information. Strong implementations separate authentication from authorization, validate tokens correctly and define clear roles, scopes and session rules.
Ecosystem and tooling
OAuth work spans identity providers, API gateways, backend services and client applications. Common ecosystems include Auth0, Microsoft Entra ID, Okta, Keycloak, Google Identity and cloud-native identity services. Specialists also work with JWT validation, JWKS endpoints, PKCE, refresh tokens, secure secret storage, consent screens and automated security tests.
Typical delivery work
- Design authorization-code flows for browser and mobile applications
- Protect REST and GraphQL APIs with scopes, audiences and token validation
- Connect internal systems to enterprise identity providers
- Add OpenID Connect login and account-linking journeys
- Review redirect URIs, token lifetimes, consent and logout behavior
These deliverables often appear in SaaS products, marketplaces, financial services, healthcare systems and B2B integrations. In Berlin, specialists may support local product teams on site or collaborate remotely across distributed engineering and security functions.
When specialists help
Companies bring in freelance OAuth expertise when a new API needs delegated access, an application is replacing custom login, or several identity providers must work together. Specialist support is also valuable during migrations, security reviews, incident follow-up and compliance-focused delivery. Clear requirements around clients, resources, scopes and trust boundaries make the work faster.
What strong professionals know
Strong OAuth professionals understand protocol details and the application context around them. They can explain authorization-code flow, PKCE, token storage, CSRF protection, replay risks and key rotation in practical terms. They test failure paths, document trust relationships and work comfortably with backend, frontend, mobile, DevOps and security teams. For Berlin-based collaboration, clear English is common, while German may matter for stakeholder communication.
Frequently asked questions
Need clarity? These are the questions we hear most often about OAuth.
OAuth is used to let an application access protected resources on a user’s behalf without receiving the user’s password. Companies use it for API access, delegated permissions, social sign-in integrations and connections between business systems.
OAuth 2.0 handles authorization: which client can access which resource and with what scope. OpenID Connect builds on it to provide authentication and identity claims, making it suitable for user login as well as access control.
OAuth provides scoped, revocable, token-based access and supports delegated permissions, which API keys generally do not. SAML is widely used for browser-based enterprise single sign-on, while OAuth 2.0 and OpenID Connect are usually better suited to modern APIs, mobile apps and web applications.
A strong OAuth 2.0 specialist should also understand OpenID Connect, JWTs, HTTPS, PKCE, browser security and API design. Experience with identity providers such as Keycloak, Okta or Microsoft Entra ID is useful, as are skills in backend, mobile or cloud security work.
The right level depends on the risk and integration complexity, not on a fixed number of years. A simple provider integration may need focused implementation skills, while a multi-tenant platform or regulated API needs someone who can design trust boundaries, threat models, token policies and migration plans.
OAuth projects are often well suited to remote collaboration because configuration, code review and security documentation can be handled online. On-site work in Berlin can still help when specialists must coordinate closely with product, security or compliance stakeholders, and teams should agree on language expectations early.
Ask the OAuth specialist to explain the flow from client registration through consent, token issuance, API validation and revocation. Review how they handle PKCE, redirect URI validation, token storage, key rotation, error paths and least-privilege scopes, then test the design against realistic threats.
An OAuth review is worthwhile before launching a public API, adding a new identity provider or changing token and session behavior. It is also useful after an incident, during a migration from custom authentication, or when teams cannot clearly explain token audiences, scopes and trust relationships.
The average hourly rate of freelancers in Berlin, Germany who have used OAuth in their recent projects is 83 €, which corresponds to a daily rate of about 664 € based on an 8-hour working day.
Of the freelancers in Berlin, Germany who have used OAuth in their recent projects, 100% hold at least a Bachelor's degree and 37% 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 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 (16%).
The most common industries among freelancers in Berlin, Germany who have used OAuth in their recent projects are Information Technology (100%), Education (52%), and Banking and Finance (44%).
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 (64%).
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 Countries:
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