OAuth Experts in Stuttgart
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Meet FRATCH Experts in Stuttgart, who have recently used OAuth
Sercan Tatar
Last position:
Co-Founder & Lead Software Architect at Pflege-Pfad
- Focus: system architecture, cloud-native platforms, microservices, API design
- Product: Pflege-Pfad is a digital matchmaking platform that connects relatives of people in need of care directly with verified care services and caregivers - without an agency and without ongoing fees.
- Business analysis & process design:
- Analysis of the German care market and identification of the key pain points of both target groups.
- Modeling of the core business processes: registration, verification, care request, application, placement, and rating.
- Definition of the business model as a freemium/premium model with optional contact unlocking.
- Creation of user stories and requirements documentation for relatives, care services, and administrators.
- Design of trust and quality assurance mechanisms with document upload, admin review process, and rating system.
- Coordination with stakeholders and validation of product decisions with potential users.
- Technical implementation:
- Design and implementation of the entire platform architecture as a solo developer.
- Design and implementation of a REST API with Spring Boot and Kotlin, including JWT-based authentication.
- Development of the frontend as a single-page application with Angular 17.
- Implementation of the AWS infrastructure with EC2, RDS PostgreSQL, S3, CloudFront, and IAM.
- Document upload with AWS S3 via presigned URLs for verification of care services.
- Email notifications via Resend API.
- AI-supported care service search via OpenAI API.
- Implementation of complete user flows such as registration, login, password reset, and placement process.
- Building an admin panel for user and care service management as well as analytics.
- CI/CD with GitHub Actions and containerized deployments with Docker.
- End-to-end tests with Playwright.
Technologies: Kotlin, Spring Boot 3, Spring Security, JWT, JPA/Hibernate, PostgreSQL, Angular 17, TypeScript, RxJS, AWS (EC2, ECS, S3, CloudFront CDN, RDS PostgreSQL, IAM), nginx, GitHub Actions, Playwright, Maven, Git, OpenAI API, Resend API, Docker, Scrum, i18n (DE/EN/TR), Kiro, feature-flag architecture.
Will Orrantia
Last position:
Solution Architect at Stuttgart Police Authority
Designing the migration strategy for WLS applications to the BKA cloud and Stack IT
Creating a hybrid cloud for internal testing and development with Kubernetes
Transforming the IT landscape from a legacy monolithic architecture to a cloud-based architecture
Integrating new CI/CD processes using Azure Pipelines
Quadrupled the throughput of personnel security checks
Migrated personnel security clearance applications to Docker-based applications
Built CI/deploy pipelines with Azure DevOps
Environment: Java Spring Boot, Kubernetes, Oracle WebLogic, OpenID, Camunda, JUnit, TOGAF
Lothar Hinsche
Last position:
Solution Manager for PoC investigation and for replacing and refining an existing cloud and IoT power plant control system at Shell AG and NEXT Kraftwerke GmbH
- Investigating the PoC and replacing and refining an existing cloud and IoT power plant control solution for certificate management of renewable energy plants (solar, wind, biomass, etc.) for the largest European renewable energy network operator, including examining the field IoT devices and their integration and network connections, aiming for automated PKI key management.
- Messaging with Kubernetes for large API-connected enterprise applications
- Risk and attack vector analysis, software quality & bug assessments
- Agile workload scheduling via Jira & Confluence
- Evaluation of pub/sub message streams for MQ and Kafka.
- Various tests with “best design approaches” for resilience patterns like circuit breaker designs, throughput measurement and monitoring, bulkhead governors – for robust EA design
- Integration of API management with IBM's API Connect to Kubernetes for platform-agnostic microservices API management designs. Google Apigee
- Solution health check approaches for load burst situations + remedy
- Research and evaluation of potential sub-service providers in the coordinating role as solution manager. CIS20 controls.
- DREAD and STRIDE security assessments.
Achille Chimi
Last position:
Backend/Frontend Developer at ITZ-Bund
Development of a microservice application for calculating postings on accounts
Development of backend components with Java or JEE, Quarkus, Kafka, Rest API
Development of the test component with mocking frameworks (Mockito)
Development of integration test components
Creation of OpenAPI specification format
Configuration of CI/CD pipeline
Development of frontend components with React
Design, further development and optimization of system structures
Code review
Java Corretto 21, JEE, Quarkus, Golang
Reactive programming with Spring WebFlux, Project Reactor
Git, Azure DevOps for CI/CD pipeline, YAML, Json Swagger UI, Postman, Rest OpenAPI, Kafka Streams, Kafka Connect, Log4J
Microservices, Jira, Confluence, MySQL, Docker, Kubernetes (deployment via Helm charts)
Spring Security, OAuth 2, JWT, Sonarqube
IntelliJ, Maven, logging framework Splunk, Agile method Scrum, Nexus, Vaadin V24, build tool Vite
React, React.JS, Node.js, Jess/JavaScript, Tailwind CSS, Agile method Scrum, accessibility BITV, Playwright
Benjamin Schaich
Last position:
Design and implementation of a new cloud service at Porsche AG
- Design of a new cloud service
- Requirements Engineering
- API Design (REST API, Kafka)
- Consulting on architecture, feasibility and effort estimation
- Implementation of a microservice architecture
- Implementation of a Spring Boot web service
- Development of REST APIs including business and persistence logic
- Kafka consumers and producers
- Various Excel upload/download scenarios
- Change Data Capture
- Cloud provisioning with IaC/Terraform
- Go-live with 30,000 users
- Operation, support and bug fixing for other services
Environment/tools: GitLab, JIRA, Confluence, IntelliJ, Spring Boot, Java, Docker, Terraform, AWS ECS, Postgres, Apache Kafka, SAP Datasphere, JUnit, Debezium, Apache POI, Hibernate, JPA, Testcontainers
Marcel Schmidt
Last position:
Technical Lead / Lead Developer at REWE digital
- Due to an organizational restructuring towards product-based teams, the implementation of a Data Mesh in the area of Digital Supplier Management (DSM) was decided.
- A highly available real-time Data Mesh for providing large volumes of data via Kafka and REST to other products.
- New development of a core supplier management software in a (micro-)service-based architecture with a modern tech stack.
- Technologies/Tools:
- Java 21
- Spring Boot
- Angular
- TypeScript
- Go
- MapR
- Kafka
- Docker
- Google Cloud Platform (GCP)
- Kubernetes
- Helm
- GitLab CI
- Maven
- JUnit
- Mockito
- WireMock
- Cypress
- Keycloak
- OAuth 2.0 & OpenID Connect
- Humio
- Nexus
- Artifactory
- SonarQube
- Renovate
- Git
- Postman
- IntelliJ
Discover over 15,000 top freelancers
Statistics of experts using OAuth
Aggregated from the professional profiles of matched freelancers.
Experience
18 years (Germany: 19 years)
Position duration
1 years (Germany: 1.8 years)
Positions per freelancer
19 (Germany: 14)
Top business areas
Information Technology, Operations, Product Development
Top industries
Automotive, Banking and Finance, Information Technology
Certification focus areas
Information Technology, Operations
Bachelor's degree or higher
100% (Germany: 86%)
Master's degree or higher
50% (Germany: 51%)
Certifications per freelancer
1 (Germany: 2)
Most common languages
German, English, Spanish
Speak two or more languages
100% (Germany: 97%)
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 Stuttgart 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 Stuttgart 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 30 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
About the technology
What OAuth does
OAuth is an authorization framework for giving apps limited access to user data without sharing passwords. It is used for login and consent flows, API access, and delegated access across web, mobile, and backend systems.
Where it fits
- Single sign-on and account linking
- API access with bearer tokens
- Delegated access for partner integrations
- Login flows that pair with OpenID Connect
It often sits between the app, an authorization server, and resource servers. In Stuttgart, it is common in enterprise software, connected mobility services, and platforms that need secure integration with partners.
Common stacks
Strong specialists work with OAuth 2.0, OpenID Connect, JWT, PKCE, and identity providers such as Keycloak, Okta, Auth0, Microsoft Entra ID, or Google Identity. They also understand scopes, grants, redirect handling, token lifetimes, and refresh logic.
When to bring in help
Companies usually need freelance expertise when an implementation must be secure, audited, or tied into existing identity systems. That is also true when legacy login flows need to be replaced, APIs need clearer access control, or multiple apps must share one identity setup.
What strong specialists do
- Choose the right grant type for the use case
- Configure scopes, claims, and consent screens
- Protect token exchange and refresh flows
- Review edge cases around logout, revocation, and session handling
Good professionals write clear implementation notes and work well with security, backend, and product teams. They keep the flow simple for users and strict for access control.
Local delivery
For Stuttgart projects, companies often want experts who can work with internal teams in English and, when needed, German. Remote collaboration is common, but on-site work helps when identity changes affect several systems or stakeholders at once.
Frequently asked questions
Questions about OAuth? Start with the answers below.
OAuth is used to let one application access another system on a user’s behalf without sharing credentials. In practice, that means login handoff, API authorization, partner access, and controlled access to user data. It is a core choice when an app must talk safely to identity providers and protected APIs.
OAuth handles authorization, not identity by itself. OpenID Connect adds a login layer on top, which is why the two are often used together. If a project needs both secure sign-in and access to APIs, specialists usually design them as a pair.
OAuth work becomes risky when security, legacy systems, or multiple applications are involved. A freelance specialist is useful when you need to redesign a broken login flow, connect external identity providers, or review scopes and token handling. It is also a good fit for short, focused implementation or audit work.
A strong OAuth specialist usually knows OpenID Connect, JWT, PKCE, and common identity platforms such as Keycloak, Okta, Auth0, or Microsoft Entra ID. They should also understand redirect URIs, refresh tokens, consent screens, and API protection. Clear documentation and security review habits matter just as much as the tooling.
OAuth can look simple at the surface, but secure production use needs practical experience. A small internal app may need only one capable specialist, while a larger platform often needs someone who has handled token lifecycles, revocation, and multi-app identity setups before. The more systems and user flows involved, the more experience matters.
Yes, OAuth projects are often done remotely because the work is mostly design, integration, and review. For Stuttgart teams, remote collaboration works well when requirements are clear and the identity setup is already documented. On-site time can help when the project touches several internal systems or sensitive security decisions.
A good OAuth expert can explain the flow in plain words, point out security risks, and show how they handled scopes, tokens, and edge cases in past work. Look for clear reasoning around grant types, logout, refresh, and revocation rather than vague claims. Strong specialists leave behind setup notes that your team can maintain.
OAuth is often compared with SAML, basic authentication, and custom token schemes. In modern web and API work, it is usually preferred when you need delegated access and fine-grained permissions. If the project is about enterprise sign-on rather than API authorization, a specialist may combine it with OpenID Connect or consider SAML as well.
The average hourly rate of freelancers in Stuttgart, Germany who have used OAuth in their recent projects is 105 €, which corresponds to a daily rate of about 839 € based on an 8-hour working day.
Of the freelancers in Stuttgart, Germany who have used OAuth in their recent projects, 100% hold at least a Bachelor's degree and 50% hold at least a Master's degree.
On average, freelancers in Stuttgart, Germany who have used OAuth in their recent projects have 18 years of professional experience, with a single engagement typically lasting around 1 year.
The most common languages among freelancers in Stuttgart, Germany who have used OAuth in their recent projects are German (100%), English (100%), and Spanish (50%).
The most common industries among freelancers in Stuttgart, Germany who have used OAuth in their recent projects are Automotive (100%), Banking and Finance (83%), and Information Technology (83%).
The most common business areas among freelancers in Stuttgart, Germany who have used OAuth in their recent projects are Information Technology (100%), Operations (83%), and Product Development (83%).
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.
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