Freelancer profile translated to English.

Description

Software architect focusing on highly available, security-critical systems. 20+ years of experience in Java and cloud architectures, event-driven systems, Kubernetes ecosystems, and identity/security (OIDC, Zero Trust).

Specializing in scalable enterprise systems in the finance, infrastructure, and public sectors.

Industry field of expertise

Languages

German
Native or bilingual
English
Fluent

Workplace preferences

Can work on-site

Frankfurt am Main (up to 50km)

Bankverlag
DevOps Engineer & Software Architect
BANKING AND INSURANCE
January 2025 - December 2025 (11 months)
Köln, Germany
As part of the introduction of a highly available Verification-of-Payee system, several microservices were integrated into a KRITIS-compliant on-premises Kubernetes infrastructure. The project involved the technical architecture, scaling, and secure operational deployment of a VoP system for processing large volumes of data in mass payment transactions according to PSD2/ISO-20022 standards.
A special focus was placed on audit-proof processing of account data, robust automation of processing pipelines, and the integration of security-critical components such as Identity Provider, API Gateway, and Secret Management.
PSD2 Verification of Payee ISO 20022 SWIFT Payments Payment Transactions
ENBW GmbH
Modernization and Security Optimization of a KRITIS System
ENERGY AND UTILITIES
November 2022 - April 2023 (5 months)
Stuttgart, Germany
Comprehensive modernization and security optimization of a critical infrastructure system (KRITIS). The system architecture was modernized, critical security vulnerabilities were addressed, and overall efficiency was increased.

Conception and implementation of decommissioning activities for no longer needed software components
Analysis and simplification of existing interfaces
Structural and content optimization of the Oracle database
Updating 3rd-party dependencies to the latest versions
Execution of comprehensive code reviews with a focus on security
Identification and remediation of critical security vulnerabilities according to KRITIS requirements
Code Review KRITIS Application Security IT Architecture Software Architecture
DB Netz AG, DB InfraGO AG
Solution Architect, Workstream Lead
TRANSPORTATION
December 2020 - July 2024 (3 years and 7 months)
Hesse, Germany
• Structuring and updating architecture documentation, specifying interfaces and procedures, analysis and consulting on operational concepts
• Conception and development of a dashboard in JavaFX for master data management and control of disposition components
• Quality assurance, gap analysis of business requirements, quality gates
• Automation of build and delivery processes with Gradle and GitLab
• Conception and implementation of a customer-specific SSO solution according to OIDC/OAuth2 standard, replacing Kerberos
• Conception and implementation of an email system with personal and group mailboxes and synchronization with business applications
• Introduction of functional, reactive programming, static code analysis, code review, test automation, migration to microservices
• Conception for load and performance testing
• Creation of manuals, IT concepts in AsciiDoc with CI/CD integration
• Building a productive development team (from 3 to 10)
• Coaching the team on technological topics such as Screaming Architecture, Domain Driven Design, Clean Code, Clean Architecture, JavaFX, OIDC, OAuth2, 2.1, Spring Boot 2.7-3.3, 17+21, Git, JMS, Eclipse RCP
Software Architecture IT Architecture Code Review Solution Architect Team Leadership