Freelancer profile translated to English.

Description

Expert in Cloud-Native Architecture & Security in regulated industries. For over 14 years, I have been implementing high-performance IT systems for the financial and healthcare sectors, among others. As a Technical Architect and Lead Developer, I specialize in the conception of Zero-Trust models and CIAM integrations. I offer deep expertise in Event-Driven Architectures (Kafka) as well as the implementation of machine learning algorithms for data classification within modern microservice landscapes. My current scope also includes the end-to-end integration of enterprise AI solutions, particularly in the area of LLM & Transformer development and inference engineering. I design architectures using Retrieval-Augmented Generation (RAG) and vector databases, as well as more in-depth structures based on Neural Networks (Deep Learning).

Industry field of expertise

Languages

German
Native or bilingual
English
Fluent
Russian
Basic

Workplace preferences

Can work on-site

Frankfurt am Main (up to 20km)

Deutsche Bundesbank
Senior Cloud Native Software Developer/Architect
BANKING AND INSURANCE
November 2022 - Today (3 years and 9 months)
Frankfurt am Main, Germany
NExt – Re-conception of internal portal (Enterprise Banking)
→ Architecture and implementation of scalable cloud-native microservices on Azure Kubernetes Service
→ Development of an Event-Driven Architecture with Kafka
→ Conception and implementation of a flexible query engine that makes business objects performant via REST and enables new use cases without API adjustments
→ Integration of machine learning methods for master data classification
→ Analysis of complex load test scenarios and derivation of targeted performance and stability optimizations
→ Increase in system resilience through robust Kafka error handling, Circuit Breaker
→ Integration and orchestration of CIAM systems including asynchronous real-time synchronization, definition of data sovereignty, and complex authorization and permission concepts (e.g., Delegated Administration)
→ Creation of architectural decisions and technical documentation

Technologies & Tools
Java 25, GO, Quarkus 3, Kafka, Docker, Kubernetes, REST RMM3, Microsoft Azure, OpenTelemetry, REST, GraphQL, OAuth 2, OpenID Connect, Redis, Machine Learning Weka, Naïve Bayes Text classification, KNN Algorithm, Spotify Voyager ANN, Fuzzy String matching, Apache Avro, AMQP, Apicurio Schema Registry, Xsd Validation, Groovy, Microsoft SQL Server, Flyway DB migration, Mockito, GraalVM, JWT, mock-server, Eclipse Vert.x, Maven, SonarQube, IntelliJ IDEA, Prometheus, Grafana, ArgoCD, GitLab, OneWelcome CIAM, PingIdentity CIAM, Nevis CIAM
Apache Kafka Machine learning CIAM Kubernetes OAuth2
Kassenärztliche Vereinigung Bayerns
Senior Software Developer
HEALTH AND WELLNESS
September 2021 - November 2022 (1 year and 2 months)
München, Germany
Own Activities
Argus Authentication and Authorization
→ Further development of a central authentication and authorization system
→ Conception and implementation of REST interfaces with OAuth2 and OpenID Connect
→ Connection to messaging systems for asynchronous processing of security-relevant events
→ Maintenance and optimization of the persistence layer
→ Continuous improvement of automated test coverage
→ Ensuring stability, maintainability, and compliance requirements

Technologies & Tools
Java 11, Spring 5, Spring Boot 2, Kubernetes, Docker, Helm, RabbitMQ/AMQP, OAuth 2, OpenID Connect, JWT, SAML, Flyway DB Migration, WireMock, Selenium, Junit 5, Mockito
Spring boot Docker OAuth2 OpenID Connect Kubernetes
Deutsche Bahn
Senior Software Developer
LOGISTICS AND SUPPLY CHAIN
April 2019 - September 2021 (2 years and 5 months)
Frankfurt am Main, Germany
Own Activities
Traveler Information
→ Conception and implementation of REST and messaging interfaces (MQ, MQTT)
→ Development and operation of microservices in the Kubernetes cluster
→ Migration of existing legacy systems into a modern microservice architecture
→ Securing services by implementing OAuth2-based security concepts
→ Further development of the persistence layer and optimization of data access
→ Significant improvement of test coverage and system stability
→ Conception and execution of load tests for performance validation
→ Setup and maintenance of a CI/CD pipeline

Technologies & Tools
Spring Boot 2, Spring 5, Spring Security OAuth2, Java 8, JSF 2, JoinFaces, Docker, Kubernetes, Ingress, Rancher 2, MariaDB, Mysql,
Hibernate, MQTT, IBM Watson IOT, Oracle AQ, Gradle, Maven, Jenkins Pipeline, Swagger, Prometheus Monitoring, JMeter, Logback, Flyway DB Migration, AWS Cloud, SOAP-UI, JFrog Artifactory, Grafana
Amazon Web Services (AWS) Spring boot OAuth2 Java EE