Android Experts in Cologne

• Design, planning and execution of complex acceptance tests for a document exchange platform for the German justice authorities.
• Validation of decrypted and certificate-based message exchange via web platform, mobile app, and Java API.
• Documentation of test cases, execution steps, and test results.
• Technologies: Windows 11/10, Ubuntu, iOS, Android, Bash for Windows, Java 17, IntelliJ, Git, Jira, Confluence, Citrix Server, xJustiz standard implementation, specific justice software.

• Worked on FPGA enhanced network encryption device with secure boot, TPM2.0 and smart card integration for BSI approved usage with Post Quantum Cryptography
• Developed and audited Linux drivers
• Collaborated using GitLab, Gerrit, Confluence and Jira
• Technologies: C, C++, Secure Boot

• UI design of the Penny mobile app and ongoing maintenance of the company-wide design system — carried out with a senior UI designer from the Artyspark team.
• Managing, briefing, and quality control of all design decisions; close coordination with Penny's internal product team in product management and development.
• Ensuring consistent UI standards across the app and design system; reviewing and approving components, tokens, and guidelines.

• Improvement of the Information Security Management System (ISMS) based on ISO 27001, NIS2, DORA, B3S, TISAX and BSI IT Baseline Protection
• Conducting comprehensive gap analyses to identify gaps and derive action plans according to the above standards and regulations; management and KPIs
• Data Loss Prevention strategy and implementation using MS Purview
• Vulnerability and patch management, security monitoring
• Risk analysis and threat modeling using the STRIDE methodology
• Development of vendor risk assessments, implementation of risk classifications, conducting supplier assessments and implementing technical monitoring solutions (e.g. Security ScoreCard)
• Securing cloud environments (AWS and Azure); expertise in CSPM/CNAPP (Wiz), cloud migration, secure CI/CD pipelines, container security and best practices in AWS, Azure and Office 365
• Application security: penetration testing, DevSecOps, OWASP, pre-commit hooks, key and secret management, IDE plugins, static source code analysis, dependency checks, container scanning, vulnerability management, CIS benchmarks and compliance
• Security assessment and hardening according to CIS benchmarks and cloud conformity in AWS, Office 365 and Azure

Consulting, designing, and implementing the software testing lifecycle for multiple Android apps and backends Introducing test automation with Appium, SpringBootTest, RestAssured Setting up and managing emulators Developing an E2E library, an integration library, a Testcontainers library, and other libraries Developing, implementing, and advising on CI strategies Building the test environment with Testcontainers and virtualization Developing and implementing test cases for integration tests and end-to-end tests Establishing a maintainable test architecture with low entry barriers to simplify the creation of automated tests Some tools and technologies used: JUnit, RestAssured, Testcontainers, Kubedock, Appium, Android emulator, Jira Xray, Mockito, WireMock, Spring Framework, Kotlin

Concept development and redesign of a real estate sales platform, AI-driven ideation with Claude

Real Estate Conversion Optimization Claude

• Established and led QA processes for IoT-embedded systems utilizing Wi-Fi, Zigbee, and DALI protocols.
• Responsible for requirement validation, end-to-end manual testing, and defining test and release strategies to ensure seamless product delivery and stakeholder alignment.
• Collaborated closely with clients and internal stakeholders.
• Developed data-driven quality dashboards and reports, improving stakeholder visibility and enabling faster, more informed decision-making.
• Worked with an agile state of mind in a Scrum/Kanban team using Jira, Confluence, and TestRail.

• Owned the development of partner-critical onboarding processes of the B2B2C-facing SaaS platform.
• Collaborated cross-functionally with engineering, design, and enterprise clients to deliver a scalable and API-first onboarding flow.
• Delivered the company’s main initiative — dynamic product — in close collaboration with internal SMEs and energy supplier clients.
• Increased successful user activations by 10% through streamlined ADDRESS API integration and real-time monitoring tools.
• Defined and prioritized product roadmap based on business goals, client needs, and platform vision.
• Led discovery sessions and co-creation workshops with customers, turning insights into validated product opportunities.

• Built and successfully established a qualitative online market research software platform (Software-as-a-Service) as a boutique provider and grew it into a top 5 provider in the DACH region
• Product ownership and project management for the SaaS software platform in over 20 countries, and since 2017 for the mobile iOS and Android app
• Defined and implemented the product vision and roadmap, product and interface design, product backlog management and prioritization, including customer requirements and stakeholder input
• Advised corporate clients on structured user feedback and led user experience studies (in-home use tests, diary studies, user acceptance testing)
• Collaborated on digital product development projects in a corporate environment (apps & IoT applications) and facilitated workshops with D-level stakeholders in German and English
• Responsible for acquisition and account management of corporate clients in German-speaking countries and across Europe
• Built and led the Professional Services team both functionally and disciplinarily, with a focus on data protection and GDPR compliance

• Further training to become a certified AI expert in the company
• Fundamentals of AI
• AI tools
• Prompt engineering (creation of professional prompts)
• (Advanced) Process automation with AI and make.com
• AI in marketing and sales
• Legally compliant use of AI in companies
• Intelligent knowledge management
• AI in customer management
• Developing AI guidelines for the company
• AI integration into the company

• Launched Eve AI, a conversational AI coach that increased course engagement by 25% through real-time, personalized prompts and guidance, reducing user isolation and improving user retention
• Led the development and beta release of the Transformation AI Coach, which provided tailored guidance to users, resulting in a 10% reduction in churn within the first quarter by utilizing predictive AI for personalized interventions
• Oversaw the rollout of AI-driven content recommendations across iOS/Android, boosting course completion rates by 25% through personalized suggestions based on dynamic user profiles
• Enhanced AI-driven customer experiences by optimizing predictive models for churn reduction, improving user retention with data-driven alerts and actions
• Spearheaded the use of predictive AI to analyze behavior and identify early churn risks, applying actionable prompts that directly impacted user retention and engagement
• Optimized AI-human escalation flows and maintained 90+ NPS while scaling engagement through smart feedback loops

• Promoting and applying agile principles and Scrum frameworks in multiple teams
• Facilitating Scrum events (e.g. Daily Stand-Ups, Sprint Plannings, Reviews, and Retrospectives)
• Supporting teams in removing impediments and blockers
• Implementing metrics (e.g. velocity, burndown charts) to monitor and improve team performance
• Successfully conducting workshops and training on agile methods and best practices
• Technologies: Jira, Confluence, Scrum
• Methods: Scrum framework