PDF Experts in Berlin

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

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

• Moss is a spend-management platform for SMEs that bundles corporate cards, web-based applications and reimbursements, AP/procurement and advanced accounting in one place.
• Splits time across Accounting, Spending and Growth tribes, handling requirements gathering, public product design, coding, testing, debugging and internal apps.
• Participates in development and maintenance of the design system/UI kit and supports tooling, documentation and developer experience.
• Builds form-heavy UIs, drawer-based editing, high-density/resilient tables with server-side filters, pagination, column configurations, CSV/Excel export and bulk operations, all wired for permissions and auditability.
• Works with complex cross-entity relationships without a single-schema solution.
• Uses React, Redux Toolkit, styled-components, react-hook-form, React PDF, Vite, Lokalise, React Testing Library and Playwright.

• Overhaul of the entire design and implementation of new UI/UX aspects using React
• Planning of the software architecture and structuring of the project for long-term scalability using Git for version control

• Optimized the data architecture (medallion) to better decouple processing stages and improve transparency and reproducibility
• Ensured technical quality of data processing in Databricks by introducing schema enforcement, data quality checks and a structured data architecture
• Orchestrated pipelines with Azure Data Factory
• Professionalized and automated the development and deployment process by integrating Git and GitHub Actions
• Led the Data Engineering team (3 members) in a functional role
• Conducted workshops to optimize and stabilize the data platform and the development process
• Collected and prioritized new requests, maintained the product backlog
• Technologies: Microsoft Azure (Data Lake, Data Factory), Databricks, Apache Spark (PySpark), Python, SQL, Git, Confluence, Power BI, Power Apps, Dataverse, MS SharePoint, Mural

• Hired and mentored small design team; improved cross-functional collaboration
• Guided brand & CI evolution for improved product-market-fit; supported rollout across teams & channels
• Improved team processes and adapted workflows to shifting requirements
• Creation, maintenance of a Design System for product, content & marketing
• End-to-end product design for key features (e.g. onboarding, digital therapy modules) in a regulated health market, aligning with medical & business needs
• Supported marketing, sales & content teams in print, merchandise, web & motion
• Stakeholder management & collaboration across departments

• Part-time 2-3 days/week
• Developments in the SD module and CRM Interaction Center
• Consulting, customizing in SD module
• Adapting Fiori applications in the SD module
• Approval workflow for credit memos: design, concept, implementation, customizing
• Credit memo request: object type BUS 2094
• If the credit memo request value is below a certain threshold -> automatic release and removal of billing block
• If the credit memo request value is above a certain threshold -> automatic determination of the responsible employee
• The employee receives a work item in their integrated inbox or in My Inbox (Fiori) -> the employee can reject, approve, or edit the credit memo request
• UML modeling in technical documentation
• Creating a Z-table for customer sample line items
• Merging COA1 (delivery) + COA2 (CAQ) forms and adding to the spool request as a single PDF
• Correcting workflow title according to NACE, fixing message "ZBMA title is displayed incorrectly in SBWP (Workplace)"
• Receiving PLM documents from an external PLM system, creating an RFC function module, storing PLM documents in the material master as GOS objects
• On releasing a production order, reading PLM documents from MM and saving them in a shared folder for the MES system
• Displaying the number of inspection methods in a popup when creating an order -> VA01/VA02
• Automatic stock reconciliation LVS IDOC INVCON
• Performing AQUA tests
• IDOC archiving for old IDOCs
• NL_PM_drawings and storing print output, informing MES via ZPPORDER IDOC, writing technical documents
• Using SD user exits, BADIs for various requirements
• Extending screens for customer requests via screen exits
• Creating message types for sales orders, purchase orders, and invoices
• Extending CRM Interaction Center Business Partner -> Overview -> Contract with customer-specific requirements
• New Fiori application departure control with data from Z-table and standard equipment tables, displaying a pie chart, calculating "vehicles in operation"
• Extending Interaction Center Business Partner -> Overview -> new tab on Overview Page with list tables for performance feedback, attachments from GOS objects
• Extending Interaction Center Business Partner -> Overview -> new tab on Overview Page with list tables for PM quality notifications, attachments from GOS objects
• Implementing BADIs in CRM
• File storage on SAP server/UNIX server
• Using BOL/GENIL architecture in CRM development
• Project language: German

For Regiolux GmbH, I produced several brochures and an info sheet in seven different languages in this project. To make offset printing especially efficient and cost-effective, I implemented all language variants in Adobe InDesign on separate layers. This way, the different versions could be produced by simply swapping the black printing plate—a simple but effective solution.

In addition to working according to the corporate design, my tasks also included final artwork and creating web and print PDFs. I coordinated communication with translation agencies and printers, ensuring a smooth project flow.

• Implemented Service Tickets functionality for the HOLAWAL Partner Portal, taking full ownership of the epic from architectural design to delivery
• Conducted stakeholder meetings, defined solution approach, and developed a reusable dynamic LWC component that enables configurable flow creation through JavaScript file settings
• Implemented the IP-VPN workflow as a new business product and managed its end-to-end delivery using Salesforce Communication Cloud
• Designed and developed a customer-facing quoting mechanism enabling external customers to view and accept quotes seamlessly
• Localized and enhanced the customer portal by implementing Dutch translations, improving usability and engagement for a major Dutch client
• Designed a quote request submission flow for the customer portal using Balsamiq wireframing tool, ensuring all required details were captured upfront
• Developed an order form flow using Lightning Web Components to capture products, linked services, and service locations
• Configured Salesforce Industries CPQ by modifying existing products, adding new attributes, and implementing validations to enhance product customization and accuracy
• Implemented Apex mocking using the FFLIB library to build efficient, maintainable, and high-coverage test classes

• Designed and implemented end-to-end automated workflows for extracting structured data from semi-structured PDF documents including invoices and medical reports
• Leveraged Optical Character Recognition (OCR) technology and large language models to parse documents and generate validated JSON schemas
• Engineered prompt optimization strategies and rule-based classification hierarchies to enhance parsing accuracy across diverse document layouts
• Established quality assurance framework using evaluation metrics to validate output against ground truth datasets with 96% accuracy

• Updating/upgrading Linux servers to new versions
• Installing Trend Micro on Linux servers
• Creating, presenting and maintaining technical documents
• Refactoring tools
• Platforms: SUSE Linux Enterprise Server (SLES) 10, 11, CentOS, RedHat, Windows 10, PowerShell, Bash, Perl, Trend Micro AV, PuTTY, SSH, VMware
• Project language: English

• Built marketing site for video app launch
• Implemented responsive UI and performance optimizations

• Developed and maintained backend services for Q8's Digital Cards and Mobility Platform in Java and Spring Boot.
• Designed scalable, multi-tenant microservices with API-first principles using Swagger.
• Implemented asynchronous messaging with Apache ActiveMQ to decouple services and improve resilience.
• Managed multi-tenant architecture with data isolation and configurable tenant logic.
• Ensured secure data handling with Spring Security and PostgreSQL, supported by Liquibase version control.
• Integrated JasperReports for generating PDF reports based on user and business needs.
• Followed Agile practices and implemented thorough unit and integration testing.

As a consultant at ]init[, I had the opportunity to work on a government contract where I played a key role in building tools to automate a previously manual process. My focus was on building a complex multi-step form using React and Typescript.

My responsibilities included sketching out the architecture of the application and coordinating the integration of the React application into a Drupal page. Additionally, I ensured that all developers working on different parts of the project were able to communicate effectively and align their efforts towards a common goal.

Overall, I leveraged my expertise in React and Typescript to deliver a high-quality application that streamlined the administrative process.