Microsoft Windows Experts in Berlin

• Designed, built, and launched an internal event planning web application used by over 100 department leads for a large event, despite having no dedicated testing phase.

• Ensured smooth, failure-free operation during first production use, leading to the tool being adopted for future events.

• Automated catering calculations and related workflows, significantly reducing email communication and manual computation effort for meal planning.

• Managed deployment and hosting on a Linux server using Coolify, including application setup and runtime operations.

• Hired and guided a communication designer on UX while independently owning all technical decisions and implementation.

• Advising companies on building, migrating and optimising BI and reporting landscapes (Power BI, SQL, Python, ETL)

• 5 client engagements in real estate and finance since 05/2025: taking over and stabilising existing reporting, automating recurring standard and management reports, building cash-flow models

• Proposal and feasibility assessments for BI and reporting projects

• Using AI-assisted development (Claude Code) to accelerate automation, tooling and web/app development

• Custom ERP system

• Problem: A client's core processes ran on scattered, siloed Excel files with no central data storage – error-prone, hard to scale and impossible to analyse end-to-end.

• Approach: Captured the business processes and requirements, modelled the data and developed iteratively together with the business team.

• Implementation: Built a tailored, web-based ERP system with a central database, role-based modules and automated reporting – delivered using AI-assisted development in Claude Code.

• Timesheet app

• Starting point: Time tracking based on an overgrown, macro-heavy Excel template – maintenance-intensive, single-user and error-prone.

• Implementation: Migrated all functionality and VBA macros into a standalone web app with central data storage, multi-user support and automated reporting.

• Cash-flow modelling

• Starting point: The existing cash-flow model covered standing investments only; project developments were missing from steering.

• Implementation: Built and extended the CF model to include project-development cash flows.

• Optimisation: Reviewed and optimised existing CF models and expanded the KPI outputs for reporting and steering.

• Led the end-to-end delivery of enterprise full-stack web applications by driving requirement analysis, solution design, frontend and backend development, database design, API integration, code reviews, team coordination, Agile execution, CI/CD deployments, production support, performance optimization, security implementation, and stakeholder collaboration to deliver scalable, high-quality software solutions.

AI Platform Backend – Senior Developer

Brought in to design and build a backend for an AI platform from scratch, including multi-provider LLM orchestration and real-time infrastructure for AI influencer personas at scale.

Tasks and responsibilities

• Architected and implemented a multi-LLM orchestration layer with Semantic Kernel to integrate GPT-4 and other providers for core platform logic and AI influencer personas, reducing model-switching overhead by abstracting provider APIs behind a single interface.
• Designed and developed a backend from scratch in C# / .NET 10, including domain modeling with DDD, a versioned RESTful API layer, and cloud infrastructure setup on Azure.
• Built a real-time chat infrastructure with Server-Sent Events (SSE), message persistence, and delivery guarantees for live operation of AI influencer personas at scale.
• Developed a media management service with integration of cloud object storage for upload and retrieval of influencer-generated content.
• Created an integration and unit test suite with data seeding for reliable regression testing across all core platform flows, significantly reducing the production error rate.

Tools and technologies: C#, .NET, ASP.NET Core, Python, TypeScript, MySQL, Semantic Kernel, EF Core, Minimal APIs, LLM Orchestration, Prompt Engineering, Agentic AI, Generative AI, AI-Assisted Engineering, Claude Code, GitHub Copilot, Google Gemini, OpenAI API, Ollama, Redis, Azure, Azure Container Apps, Azure Database for MySQL, Docker, GitHub Actions, Clean Architecture, Vertical Slice Architecture, CQRS, Domain-Driven Design, REST API, xUnit, Integration Testing, Unit Testing, Jira, Confluence, Scrum

• Managing the further development of IT network service management

• Overall leadership of the transition, consulting on the transition of IT network services

• IT coordination of a tender in the area of IT network services

For (3) Further development of IT network service management Managing follow-up work for the transition (including setup of issue management) Managing and monitoring the performance of external service providers Consulting and managing the further development of IT network service management (processes, procedures, organization, tools)

For (2) Transition of IT network services Overall leadership of the transition (transfer of operational responsibility for IT network services to an IT service provider) Definition and setup of transition governance Planning and tracking of milestones, dependencies and cutover windows Managing the preparation, achieving operational readiness & process/tool integration Carrying out service handovers (cutover, parallel run, stabilization) Ensuring risk management, progress tracking, steering committee and management reporting, stakeholder management

For (1) IT coordination of the IT network services tender Managing all IT work streams of an IT network tender Coordinating the creation of all service descriptions IT review / evaluation of offers IT representative in bidder talks/negotiations Creating presentations/decision papers

• Add/create test specifications
• Conduct regression tests
• Conduct release tests
• Analyze Jira tickets
• Identify software defects and fix them with C#

• Codebase Evaluation & Problem Design: Designed and stress-tested complex software engineering problems against large open-source Python codebases (including pandas), requiring deep context acquisition and architectural understanding to produce well-scoped, realistic problem statements aligned to strict correctness guidelines.
• Agent Failure Analysis: Assessed LLM coding agent solutions for correctness and completeness, identifying meaningful failures across edge case handling, dtype behaviour, and multi-column NaN propagation logic; documented findings with precision for downstream evaluation use.
• Programmatic Test Suite Development: Authored comprehensive pytest suites to programmatically verify agent-generated solutions against defined requirements, with deliberate coverage of boundary conditions and failure modes not caught by naive implementations.
• Containerised Environment Engineering: Built and debugged Docker environments for reproducible agent execution, including git-based repository provisioning, dependency pinning with npm ci, and multi-stage Dockerfile authoring across Linux-based containers.

• Replacement of a RIS and PACS system in combination with three different software solutions, with a focus on redesigning and further developing existing processes.
• Ensuring the interaction of the individual solutions and their integration into one overall solution to provide optimal support for medical staff in their daily work.
• Overall project management including coordination of three service providers.
• Use of technologies and solutions such as RIS, PACS, Smart Reporting, and Artificial Intelligence.
• Leading the RIS & PACS replacement in a hospital.
• Support with the communication strategy.
• Coordination of external and internal resources.
• Stakeholder management.
• Steering of steering committees.

• Work within time-critical operating procedures; coordinate issues with customers, partners and central support.
• Maintain reliable handovers and concise incident communication when service, equipment or routing issues occur.

• IT training in theory and practice for IT specialists in application development and system integration

• Mobile Device Management (MDM) for iOS devices (iPads, iPhones)
• Management, configuration and rollout of policies, apps and security measures
• eSIM setup & management as well as management of mobile plans and contracts
• User management (create, block, delete) in the SecurePIM security solution
• Device registration, preparation and setup of devices with Windows 10/11 and peripherals
• 1st & 2nd level support and handling of IT requests via the ticket system
• Troubleshooting, fault isolation and repair of devices
• Creating and maintaining guides, training new users and handling user questions

• Project volume in €: ~15 million
• Number of employees: 8
• Managing strategic projects & leading procurement
• Outsourcing standard products abroad
• Process optimization in quality management
• Interim manager for purchasing & procurement
• Planning and implementation of optimization measures
• Material flow in production
• Warehouse management
• Process automation

• Built the Peax Berlin team
• Candidate selection and interviews
• Hiring in coordination with the Recruitment Manager
• Coaching and mentoring to develop team members and the team
• Technical and disciplinary leadership of team members
• Acquired new key clients and expanded existing accounts
• Sales and business development
• Ongoing staff development
• Acted as information link between the team and Recruitment Manager, including reporting
• Supported brand growth in collaboration with marketing (online & offline)
• Participated in trade shows and events
• Defined and enforced standards
• Developed new services in cooperation with company management
• Revenue responsibility and ensured profitability
• Budget management
• Daily operational tasks as a recruiting consultant
• Built a talent pool and client portfolio in strategic target markets

• Developed and implemented organization-wide discovery framework based on Ulwick’s Outcome-Driven Innovation; enabled 7 Product Owners to systematically identify and quantify unrealized value through shared outcome language and opportunity scoring methodology
• Transformed Product Owner role from backlog clerks to strategic experimenters; established dedicated time budget for autonomous hypothesis testing and discovery activities
• Rebuilt customer journey maps to start at actual user need (tool selection phase) instead of platform entry point; eliminated manual data aggregation work previously done by project teams
• Implemented OKR framework across 4 product teams; defined quarterly objectives with measurable key results (e.g., 40% reduction in manual integration effort, self-service adoption increase)
• Unified 3 separate platform roadmaps through cross-team dependency mapping and shared service agreements
• Supported enterprise sales cycle with ROI modeling and technical due diligence for automotive and defense customers