Docker Swarm Experts in Germany

• Development and introduction of operations processes
• Preparation of complete documentation packages (including incident management and operations support) to meet compliance requirements
• Introduction of a workshop on IaC (Infrastructure as Code)
• Technical consulting for the project security concept (ISMS)
• Installation and operation of Kubernetes clusters on AWS, on-prem, and Azure
• Hybrid cloud architecture design (on-prem, Hetzner, AWS)
• Analysis and troubleshooting of incidents and system outages
• Network adjustments for firewall rules, gateways, OpenVPN settings, and IPsec tunnels (pfSense)
• Technical consulting on Bitbucket, Jenkins, and GitLab CI/CD pipelines
• Consulting on Ansible deployments and infrastructure automation
• Consulting on building a scalable system in the cloud (AWS / Azure)
• Technologies / Tools: Ansible, Terraform, AWS, Azure, VPN, pfSense, Jenkins, Bitbucket, Kubernetes, GitLab Runner, ISMS, Golang, Prometheus, Grafana, S3, Lambda, RDS, ECS, Cognito, OIDC, Harbor, MinIO, Postgres, Redis, Keycloak, Ceph, Proxmox, CloudFormation, PostgreSQL, Flux CD, Hetzner, IONOS, Sonatype Nexus Repository, Entra ID, Dex IdP, Pulumi

• Digital and print media designer, specialist focus: digital media, PHP development, TYPO3
• PHP, MySQL programming
• Full-stack (frontend & backend programming)
• IT consulting
• Web hosting, consulting, and IT services
• Software and internet projects
• IT system administration
• Linux and Mac system administration

Further development and modernization of a mature Aspire backend application in the energy utility sector, focusing on new business requirements, testing, legacy code cleanup, and stable backend delivery.

Key Contributions & Results Implemented new business requirements in the context of customer orders, subcontractors, and cross-company backend processes, ensuring consistent workflows across a distributed system landscape. Gradually modernized existing backend components and reduced technical debt through targeted legacy code cleanup, refactoring, and structured code reviews. Improved the testability of business-critical services by expanding automated tests with xUnit, AutoFixture, and clearer validation structures. Supported the further development of workflow automation and integration processes through microservices, messaging, and API-based communication. Took over source code from external companies, systematically assessed code quality, and derived technical improvements for maintainability, stability, and integration. Worked in agile development processes with Jira, Confluence, and Azure DevOps and supported cross-team coordination on architecture, quality, and implementation. Technical Metrics Technologies & Methods C#, .NET, ASP.NET, ASP.NET Core, Aspire, Docker, RabbitMQ, gRPC, REST API, Swagger, Microservices, NServiceBus, AutoMapper, Autofac, xUnit, AutoFixture, FluentValidation, Entity Framework Core, MediatR, Redis, Consul, Serilog, SonarQube, Azure DevOps, Azure Monitor, GitLab, Google Protocol Buffers, IronPDF, Mailjet, Jira, Confluence, Miro, Agile Development, Scrum, Code Reviews, Refactoring, Legacy Code Cleanup, Workflow Automation, Power Grids

• Insurance service provider*

Challenge: Business-critical documents were processed through external OCR providers, with ongoing costs, dependency, and data privacy risks for sensitive insurance data.

Implementation:

• Architecture and production implementation of an on-premise OCR solution with full data ownership
• Methods for recognizing document structures as the basis for automated further processing
• ML-, NLP-, and LLM/VLM-based information extraction, especially from invoices and quotations

Success: Replaced external providers: full data ownership, GDPR-compliant processing, and 75% lower recurring OCR costs per year

Used technologies: Python, Docker, Microservices, FastAPI, PyTorch, Torchvision, MongoDB, MySQL

• Analysis
• Consulting
• Software design
• Development
• Automation
• Testing
• Deployment
• Architecture, development and deployment of various proof-of-concept applications around the integration of current AI interfaces including conversational, realtime voice, images and videos
• Developed best practices for working with agentic systems and AI in practice
• Created code templates

• Designed and provisioned full AWS infrastructure using Terraform, implementing containerized solutions with Docker Swarm and Kubernetes for scalability and reliability.
• Built multi-environment CI/CD pipelines (Prod, Staging, Test) using Jenkins, GitLab CI, and Maven for automated builds, tests, and deployments.
• Configured secure networking with VPCs, subnets, security groups, NAT gateways, and routing for high availability.
• Integrated Prometheus, Alert Manager, and Grafana for real-time monitoring and proactive incident response.
• Orchestrated deployment of microservices with Helm, ensuring zero-downtime releases and fast rollback capabilities.
• Mentored junior DevOps engineers on best practices in IaC, Terraform, AWS security, and container management.

• Involved in the full development lifecycle, including design, coding, testing, and deployment of Java-based applications.
• Built and maintained high-performance RESTful APIs and microservices, ensuring scalability and reliable data exchange.
• Practiced code reviews, used version control systems (e.g., Git), and collaborated closely with cross-functional teams to deliver robust software solutions.
• Implemented, managed, and optimized complex business logic and decision-making processes using the Drools Rules Engine, leveraging DRL (Drools Rule Language) for dynamic configuration.
• Developed software solutions for a major service provider in the healthcare insurance sector, specifically focusing on claims processing and reconciliation logic to ensure cost-effective reimbursement for health funds.

• Implemented asynchronous communication with Kafka Streams to update user and group data in microservices
• Conducted load and performance tests with JMeter to ensure system stability
• Migrated microservices to current versions of Spring Boot libraries for better maintainability and security
• Optimized Hibernate queries to improve database efficiency
• Deployed new microservices on AWS infrastructure using Kubernetes for scalability and fault tolerance
• Created OpenSearch dashboards to monitor and analyze system metrics
• Integrated Azure Entra user accounts via SCIM by implementing all necessary REST endpoints
• Improved response times through asynchronous processing in separate threads for better performance
• Enhanced Android device logging capabilities for easier troubleshooting
• Refactored database schema with Flyway for consistent and traceable migrations
• Updated AWS Cognito user settings to optimize user management
• Offloaded resource-intensive tasks from the main microservice into separate Docker containers to boost performance
• Used technologies: Java, JavaScript, Kotlin, Angular, Maven, Spring Boot, Spring Security, JUnit, Tomcat, Spring Data, Spring Cloud, Hibernate, Jackson, microservices, Docker, Kubernetes, OpenSearch, Grafana, OpenAPI, SonarQube, PostgreSQL, MySQL, JMeter, Kafka, Flyway, AWS, Azure, Jira, Confluence, Agile, Scrum, SAFe

• Development of control units for the automotive industry incl. embedded software
• CAN bus, Vector Tools, CANoe
• Support of the development process according to ISO 26262
• Ensuring cyber security standards:
• Key exchange (PKI) between vehicle and control units
• Hardware Security Module (HSM)
• Communication with external service providers (international)
• Development (PCB) of measuring adapters, statistical analysis of sensors
• IoT and embedded software development, backend administration

• Role: Developer, Architect
• Technologies: java, typescript, golang, spring (boot, web, security, data), Angular, AWS (OpenSearch, Aurora, SNS/SQS, CloudWatch, EC2, IAM), Kubernetes, Terraform, Helm, OAuth, Keycloak, CI/CD, gradlew, Liquibase, Test Driven Development, shell scripting

• Development & deployment of an interactive dashboard that allows users to select datasets for visual analysis.

• The application supports filters, AI-based interpretations, and a chatbot for user interactions.

• shiny, openai, mirai, plotly, mapgl, duckdb, AWS, ShinyProxy, Docker Swarm

• Information technology - consulting, projects, implementation

• Odoo – Open Source ERP – consulting, projects, customization, module development

• Digitalization consulting

• Applying information technology to implement and optimize business processes

• Using open source software to create business application solutions

• Company-specific strategy consulting in information technology

• Using innovative technologies in the company, rethinking business processes

• Implementation and use of in-house industry-specific application solutions

• ERP implementation, functional and technical ERP adaptation, and ERP module development (Odoo, ERPNext, Frappe Framework, Tryton Business Software)

• Business consulting and digitalization consulting

• Project management, SW engineering and modeling with UML, BPMN and ER modeling

• Software development in the programming languages Python, JavaScript, SQL, Smalltalk, XML and JSON

• Lecturer for subject-specific and technical training

• Use of software and system tools: Docker, Docker-Compose, Docker Swarm, Kubernetes, Rancher/Rancher OS, Git, GitLab, GitHub, Virtualbox, KVM, Quemu, Jenkins, Visual Studio, VS Code, IDE PyCharm, Jquery, JavaScript libraries, various Smalltalk IDEs, ETL systems and Kali-Linux

• Database management with PostgreSQL, MySQL, NoSQL databases and Microsoft Access

• Administration of operating systems: Windows desktop, Windows Server, Linux server, Linux desktop (Gnome, i3wm...) and Mac OS X

• Industry experience in software development, recruiting, business consulting (IT), insurance, banking, asset management, mechanical engineering, tourism, retail, pawnshops, auction houses, print, standards institutes, environmental management, information security and management, eGovernment software, automotive sales and rental, as well as for internationally active project service providers

• Implementation of specified DevOps solutions to automate infrastructure (Terraform, Bicep, CloudFormation, Ansible) on-premises datacenter (Ovirt, Proxmox, Ceph Cluster, MinIO) and private cloud.
• Administration, configuration and implementation of CI/CD DevOps pipelines (GitLab, GitFlow) to support development process (Artifactory, Prometheus, Istio, service mesh, Helm Chart, OpenShift (Red Hat Enterprise) / Kubernetes cluster), Red Hat Satellite.
• Administration, setup, monitoring and patching of Linux infrastructure based on Red Hat Enterprise for Dev, Test and QA.
• Use of Scrum and Kanban methods.
• Administration, configuration and implementation of security standards for deploying on Dev, Test, QA and Prod stages of the new ePA applications.
• Development of new plugins and add-ons needed on current infrastructure.
• Database support.
• Data analytics support (Python, Spark, Pandas, Power BI, Splunk Enterprise).
• Implementation of best practices for DevSecOps and BizDevOps using GitOps (ArgoCD), Streamlit framework, Semaphore Ansible UI.
• Configuration and testing of iperf, uperf, sysbench using benchmark-operator for external source data and IoT/MDM devices, creating reports via ELK / OpenSearch.
• Building a new Databricks platform to collect and analyze big data from different sources and IoT devices into Hadoop framework (Python, Pandas, PySpark, Power BI, Apache Airflow).
• Building backend data aggregation and processing to automate configuration deployment between different OpenShift clusters and big data framework (Python, Pandas, PySpark, Apache Spark, PostgreSQL, Django 2, Ansible Automation, Jira JSM).
• Building a new ML pipeline platform using Kubeflow, TensorFlow, KServe.
• Data extraction, transformation and loading from different data sources including structured and unstructured data to analytic DWH / big data cluster using Python, Pandas, Polars, Power BI, Django backend and PostgreSQL.
• Setup of new DevOps Test and QA HashiCorp Vault cluster for PKI and IAM.
• Configuration and testing of automated patching based on CVSS score, SIEM-integrated CVEs.
• Use of Nexpose and InsightVM to scan vulnerability events in network, host, container and application.
• Design and implementation of secure and scalable AWS architectures including VPC, EC2, S3, RDS and Route53 and similar setups on Azure and GCP.
• Automated system provisioning and deployment using CloudFormation templates.
• Configuration of IAM roles, policies and permissions to ensure secure access control.
• Patch management, backup automation and disaster recovery setup on AWS infrastructure.
• Monitoring and optimization of system performance using AWS CloudWatch and AWS Trusted Advisor.
• Support of VMware services (vSphere, Aria, Horizon) and the virtual desktop environment.
• Development and maintenance of CI/CD pipelines using Jenkins, GitLab CI/CD and AWS CodePipeline with interface to Nutanix.
• Configuration of AWS CloudWatch to monitor application performance and system events.
• Planning and execution of migration of on-premises applications to AWS cloud platforms.
• Deployment of containerized applications using Docker and Kubernetes in AWS environments.
• Deployment of internal software packages between availability zones using AWS CodeDeploy.
• Building and deploying ML models using Scikit-learn, XGBoost and Spark MLlib including hyperparameter tuning, model evaluation and production deployment.