REST API Experts in Essen

• Training the AI models, evaluating images and texts for UI/UX, turning the provided data into insights via OpenAI Feather as part of the machine learning workflow

Technologies: OpenAI Feather

• Acquires new B2B customers for an AI SaaS startup in the public tendering space and books product demos with IT decision-makers.
• Qualifies target customers based on a defined ideal customer profile, including discovery, needs analysis, and objection handling.
• Builds domain knowledge in public procurement (EVB-IT, German and EU tender portals) for technical discussions at eye level.

• Development and implementation of test concepts for complex, multi-layered systems
• Creation of regular management reports and presentations for stakeholders and clients
• Technical and disciplinary leadership of international test teams (coordination, coaching, resource planning)
• Responsibility for quality assurance across multiple test levels (unit, integration, system, and acceptance tests)
• Design of test cases and test plans in Azure DevOps; ensuring traceability and coverage
• Use of BDD approaches (Gherkin/Cucumber) to prepare test automation
• Building a test automation architecture with Playwright and integrating new tests into CI/CD pipelines
• Performing API tests (REST) and tests for mobile/PWA applications
• Setup and maintenance of test environments across multiple stages (integration, QA, UAT, pre-production)
• Test data management (synthetic and production-like data), ensuring consistency and reproducibility
• Collaboration with DevOps teams for containerization (Docker/OpenShift) and CI/CD integration
• Working under SAFe & Scrum, closely coordinating with product owners and DevOps teams
• Active participation in PI plannings, sprint reviews, and retrospectives
• Promoting an agile QA culture through coaching and knowledge sharing
• Introducing scalable test automation with Playwright → significant reduction of manual testing efforts
• Increasing test transparency through clean defect and reporting management in Azure DevOps
• Improved release quality through an end-to-end QA strategy and automated regression tests
• Strategic leadership of Trikolon Consulting GmbH and responsibility for finance, personnel, and business development

• Support in restructuring and designing the group's internal Android apps
• Defining essential modules and implementing accessible components
• Establishing agile approaches at an international level
• Technologies & Methods: Kotlin, Android, JUnit 5, Koin, Azure DevOps, Android Studio, Git, Jetpack Compose, Coil, Flow API, Ktor, Coroutines, TypeScript, Node.js

• Architecting and developing SaaS platform for graphical definition and execution of pandas data processing pipelines
• Developed POlyglott, an open-source Python CLI tool for translation workflow management featuring PO file parsing, quality linting with glossary enforcement, and DeepL API integration for machine translation
• Developed web application for material compliance management (EU REACH) using Django and modern web technologies
• Built automated infrastructure platform using Proxmox, Terraform, and Ansible — VM provisioning, configuration management, internal DNS, and fleet-wide security hardening across multiple subnets

• Gathering, analyzing, specifying, and prioritizing requirements for the 'Archive and Delete' module of the Chambers of Industry and Commerce in a Scrum team
• Capturing and specifying screen/form designs, functionality, and data types in Confluence, as well as creating user stories in Jira
• Preparing PowerPoint presentations for the 'Archive and Delete' module
• Coordinating and supporting the Chambers of Industry and Commerce in the implementation of the module
• Writing SQL scripts for an Oracle database
• Technologies used: Scrum, Confluence, Jira, MS Office, Postman, JavaScript, REST API, JSON, DBVisualizer, SQL

• Re-architected a web application that had grown over years, modularizing tightly coupled components

• Reduced response times from several seconds to <50 ms

• Removed performance bottlenecks

• Simplified architecture so internal teams can implement features on their own again

• Requirements analysis
• Provisioning of SharePoint sites and permissions
• Provisioning of SharePoint libraries and lists as data storage
• Development of the UI with Power Apps
• Development of automations with Power Automate to transfer data from Power Apps using Dataverse connectors
• Creation, customization, and management of Power Platform security roles
• Creation and management of Power Platform pipelines
• Development of UX design with Power Apps

In my role as Managing Director of QFITS GmbH, I support companies throughout the entire project cycle - from requirements gathering and process analysis to the design of suitable system solutions and all the way to implementation and quality assurance. My focus is on the introduction and integration of POS and ERP systems as well as their seamless connection to existing backend systems and interfaces.

Direct food sales (09/2025 – 05/2026) Support of a project from requirements analysis to the introduction and integration of a new POS system for a direct food sales company. A special focus was on archiving POS logs as well as preparing and providing them as transactions for connected surrounding systems. In addition, design and setup of functional tests and performance tests for the existing backend system, which had to be seamlessly integrated with the POS system.

• Significantly enhanced user experience and application performance through spearheading the development of frontend components, emphasizing native JavaScript, Vue.js, and UI implementation.
• Ensured efficient data flow and content management by seamless integration of backend APIs (REST) with frontend components and successful connection to CMS Hippo elements.
• Increased sales volume on the customer page through the development and implementation of new components, leading to improved user engagement and conversion rates.
• Worked in an Agile Scrum environment.
• Utilized technologies such as JavaScript, Vue.js, Node.js, Azure DevOps, Azure Functions, Next.js, and more.

• Designed and implemented an automation test framework using Junit and Maven, developing BDD scripts with Cucumber and reusable methods for application behavior.
• Created test data using automation scripts with Selenium WebDriver, Java, and Python, validating UI components, popup windows, and mouse movements.
• Conducted API functional testing of RESTful web services using Postman.
• Automated test execution using Maven and integrated with Jenkins, achieving a 20% reduction in regression testing time.

• SD-WAN solution by Aruba – Swiss energy company (330 sites): design and implementation of an SD-WAN branch solution with Aruba 9004 gateways, encrypted overlay, policy-based routing, WAN load balancing, and centralized management via Aruba Central.
• LAN/WLAN & security – schools in Germany (9 sites): deployment of Aruba switches & AP-505, FortiGate 80F firewalls; setup of Checkmk monitoring, incident and change management, and secure admin access (BeyondTrust).
• Multi-site security – energy billing company (20 sites): deployment of a complete Fortinet solution (FortiGate HA cluster, FortiSwitch PoE, FortiAP), IPsec remote-access VPN via FortiClient, centralized management via FortiCloud, IntraID authentication, operations and incident management.
• Data center migration – German client: migration of data center switches (Mellanox), firewall cluster, and OfficeConnect switches to a new data center; securing configurations, implementing HA designs, testing, monitoring, and coordinated change and incident processes. Setup of two new 6300 M VSX clustered switches.
• Data center security – university hospital: implementation of a high-availability FortiGate 400F firewall cluster across three data centers; security policy design, operational support, and change/incident management.
• Enterprise campus & network access control – manufacturing company in Germany: introduction of Aruba ClearPass NAC, setup of a VSX-based switching architecture, secure WLAN access with MPSK, and integration into existing networks.
• EU client (Germany & Poland) – Sophos firewalls: operations, incident and change management of Sophos firewalls including IPsec VPN; troubleshooting and ongoing optimization of security configurations.
• Network modernization – pharmacy client in Germany: design and rollout of core and access switching (Mellanox, Aruba Instant On), migration from Sophos to Fortinet firewalls, network segmentation, and security hardening.

• Project Livebash (2021-12-01–2023-12-31)

• Development and design of the core system

• Code reviews

• Developer management

• CI/CD

• Client communication

• Leading epics

• Speaking at conferences

• Managing the production system

• Interviewing project developers

• Outcome: production system

• Technologies and tools: Java 11, Java 17, Kotlin, Spring Boot, TeamCity, Gradle, AWS DynamoDB, JUnit, Mockito, Docker, Docker Compose, AWS SQS, AWS EC2, AWS S3, AWS MediaLive, Ethereum, Postman

• Project Robinhood (2024-01-01–2024-05-31)

• Customization and development of product features for specific clients

• Interviews with project developers

• Technologies and tools: Java 17, Java RX, Kotlin, Spring Boot, TeamCity, Gradle, JUnit, Mockito, Docker, Docker Compose, PostgreSQL

• Projects Sway, Tickmill, Pepperstone, UCapital (2024-06-01–present)

• Customization and development of product features for specific clients

• Bug fixes

• Porting tickets from the product

• Feature development

• Technologies and tools: Java 17, Java RX, Kotlin, Spring Boot, TeamCity, Gradle, JUnit, Mockito, Docker, Docker Compose, PostgreSQL

• Customer service and point-of-sale (cash register) operations
• Inventory management and stock organization
• Strengthened German language skills through daily customer interaction
• Worked collaboratively in a fast-paced, team-oriented environment