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Tim StallingerTS

Tim Stallinger

Java Architect | Keycloak IAM | Applied AI

€700/day
Mainz, DE
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Tim

Hello, welcome and thank you for your interest in my profile!
I am Tim, a software architect and developer with a passion, and currently a Master's student in Applied Artificial Intelligence.

I don't just code tickets, I build systems that let us all sleep soundly at night. After stints in Silicon Valley (BMW) and the Frankfurt banking sector, I know: good software is a mix of code, architecture, and above all, good communication.

Why I'm the right fit for your project:

- IAM & Keycloak: I specialize in Keycloak integrations, OAuth2/OIDC flows, and complex authorization structures. I make sure only the right people get in. While I rarely go to the gym, I can still work as a bouncer :)

- Enterprise Java: I'm comfortable with Spring Boot, Microservices, and Cloud-Native. I build backends that scale and remain maintainable.

- AI & Innovation: With my Master's in AI, I'm at the forefront of current AI developments. I can help you pragmatically integrate LLMs or Computer Vision.

- Social Dev: I don't hide in the basement. I'm communicative, critically question requirements, and can engage non-technical stakeholders.

My Scope: I offer the full lifecycle: from architecture sketches to development and testing, all the way to CI/CD pipelines.

Availability & Modus: As I am currently pursuing further education, I am available to you as a freelancer on a part-time basis (approx. 15-20 hours/week). Ideal for architecture reviews, Keycloak integrations, or to relieve your development team.
  • German

    Native or bilingual

  • English

    Fluent

Can work on-site
Mainz (up to 50km)

Experience

  • MCE Bank
    Development & Architecture of a Central IAM Login System
    BANKING AND INSURANCE
    January 2024 - December 2025 (1 year and 11 months)
    Flörsheim am Main, Germany
    In the banking environment, there is no room for security vulnerabilities. I was responsible for the design and implementation of a central login system that maps the entire corporate hierarchy and controls access to various applications.

    My Role: Lead Development Backend & Architecture.

    The Tech Stack: Keycloak (Customizing & API), Java Spring Boot, Spring Security, Docker.

    Frontend: Implementation of the user interface with Vue.js

    Result: A central Single Sign-On (SSO) point for employees that meets the highest compliance requirements.
    Java Spring Boot Keycloak Docker-Compose Back-End development Rest-API
  • dNRW
    Digitization of Citizen Services
    PUBLIC SECTOR
    January 2024 - December 2024 (11 months)
    Eschborn, Germany
    Development of a secure web application for managing citizen requests. The focus was on data protection (GDPR) and accessibility.

    Task: Full-stack development in an agile Scrum team.

    Challenge: Integration of various interfaces (XTA2, SOAP, REST) while adhering to strict data protection guidelines.

    Quality: Establishment of code quality standards through intensive code reviews and test automation (Mockito).

    Tech: Java 17, Spring Boot, Thymeleaf, Keycloak, MariaDB.
    Spring boot Java Mockito Thymeleaf Keycloak
  • S&N Invent
    Enterprise Web Application for Project Management
    DIGITAL AND IT
    January 2023 - Today (3 years and 5 months)
    Eschborn, Germany
    Replacement of a error-prone Excel landscape with a robust web solution with Active Directory integration.

    Task: Full-stack development (Java Backend + Angular Frontend) of an ERP application.

    Impact: Massive reduction in data entry error rates and increased data consistency.

    Tech: Java, Spring Data/JPA, Angular, TypeScript, Active Directory, PostgreSQL, Docker.
    Java Spring Boot Angular PostgreSQL Docker Spring boot

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Education

  • Bachelor of Science
    Johannes Gutenberg University
    2024
    Bachelor of Science
  • Abitur
    Integrierte Gesamtschule Stromberg
    2016
    Abitur

Certifications

  • Cloud Native
    S&N Invent
    2025
    Linux Docker Cloud Native Kubernetes
  • Artificial Intelligence
    S&N Invent
    2025
    EU AI Act Chatbot Prompt engineering

Skill set

Categories