PDF Experts in Berlin

Stefan O.

AI Product Leader

Last position:

Founder at ProtocolEngine.io

Evidence-led health intelligence platform turning published research into personal health protocols. It scores 430 habits, foods, and supplements against the studies behind them, and moves the score when the evidence moves. Built solo.

Built the daily ingestion pipeline across PubMed, bioRxiv, and medRxiv: 43,000+ papers from 3,400+ journals processed into 230,000+ typed evidence claims, each one traceable back to the study it came from.
Designed the six-factor evidence scoring model and the public changelog behind it, so no recommendation ever appears without the papers underneath it. 23,000+ grade changes recorded and explained to date.
Shipped an entity information model connecting every intervention to its mechanisms, biomarkers, and outcomes: 118 biomarkers with region-specific reference ranges, 77 mechanisms, 32 graded outcomes.
Built the personalisation layer: blood panel ingestion that reads lab PDFs with a vision model and corrects results for draw time against the user's wake anchor, plus Oura, WHOOP, and Withings integration for daily readiness context.
Operate eleven specialised review agents over the corpus and codebase, covering paper curation, retrieval quality, health-claim compliance across EU and US regimes, and security.
Shipped the Evidence Assistant, a RAG assistant that answers from the claim database and cites the underlying papers, plus a B2B practitioner tier, an Expo React Native app, and localisation across 3 languages and 7 markets.

Stack: Next.js 16, TypeScript, Supabase, pgvector, Anthropic Claude, Vercel, DeepInfra.

Nikolai G.

Freelance AI & Data Science Lead | Healthcare, Life Sciences, Finance | Team Leadership, R/Python, LLM Systems

Last position:

Clinical Data Manager at Dr. Falk Pharma

Used OpenCode and AI-assisted software engineering to design, implement, refactor, test, and document an end-to-end RAW/SDTM/ADaM pipeline in R for Dr. Falk Pharma (07/2026), including metadata-driven transformations, automated validation rules and QC, traceability, and reproducible clinical outputs.

Anna M.

Senior JavaScript Engineer - TypeScript, Frontend Architecture & Developer Experience

Last position:

Freelance Frontend Consultant at Mister Spex

Developed complex React/TypeScript frontend systems for highly customizable lens products.
Designed internal tooling for validating and managing product configuration constraints.
Led accessibility initiatives to align customer-facing applications with EU accessibility requirements.
Worked extensively in large legacy codebases while incrementally improving maintainability and developer experience.
Collaborated across multiple teams in an international e-commerce environment.

Jens S.

Marketing Strategist – SEA & SEO Expert

Last position:

Marketing Consultant – [New customer acquisition (B2B), Social Media, SEO] at Manufacturer of precision parts made of metal [confidential]

Strategic Marketing / New Customer Acquisition (B2B):

Market and competition analysis: Identified competitors, developed evaluation grids, sketched provider landscape with potential customers, competitors and partners
Concept for a cross-media, personalized multi-touch campaign
Developed the multi-touch strategy in different variants with several stages, defined touchpoints, target companies and target people, developed the ideal customer profile and contact ideas
Designed all individual measures: developed concepts for letters, postcards, landing pages, emails, phone calls and downloads
Visualized the logic of the contact sequences (flowchart)
Described the distinction from "account-based marketing"
Implementation planning: Researched providers for packaging, shipping and landing page software, negotiated terms, recommended tools and partners

Social Media Marketing:

Target categorization, definition and recommendation for action
Review and selection of channels
Concept for channel management
Developed an 11-week editorial plan (Instagram & LinkedIn)
Created, implemented and published image and video posts
Campaign launch, ongoing monitoring and optimization

Search Engine Optimization (SEO):

Website audit with indexing check
Ranking, backlink, traffic and competition analysis
Analyzed search and user behavior
Consulting on SEO risks during relaunches with domain changes
Keyword research and recommendations for action

Jorge N.

Senior AI Engineer | Backend Developer C#/.NET | RAG, LLM Integration, Semantic Kernel | Azure, GCP, AWS

Last position:

Senior Developer at SafeXSmart KI Solutions UG

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

Architecture and implementation of 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.
Design and development of 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 production error rates.

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

Alessandro L.

Senior Frontend Engineer | Vue.js, Nuxt, TypeScript

Last position:

Vue Frontend Engineer at Savills

Savills is one of the world's leading property advisors with 700+ offices worldwide. In Berlin, I built core digital solutions for the valuation business, replacing legacy Access-based workflows with an enterprise-grade web app built on Vue.js.
Frontend Architecture & Scalability: Designed scalable Vue + TypeScript frontend architecture for internal enterprise applications, integrating a Symfony backend and interactive maps.
Legacy Modernization: Led the modernization of legacy jQuery-based systems into maintainable Vue-driven applications, improving performance, maintainability, and efficiency across business workflows.
PDF Report Workflow Automation: Engineered Twig-based automated PDF generation pipelines that reduced manual report preparation time by ~80%, saving approximately 12h per analyst/month.
Design System & Frontend: Built a scalable SASS-based design system using mixins, maps, functions, and reusable UI patterns for consistency and long-term maintainability.

Fernando C.

Senior Front-End Developer

Last position:

Senior Front-End Developer at Moss

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.

Mario J.

Architect / Developer

Last position:

Architect / Developer at handyhase

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

Vili D.

Senior Data Engineer, Data Architect, Software Engineer

Neuenhagen

Last position:

Technical Lead, Data Engineer at Mercedes-Benz Consulting

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

Hendrik W.

Software Test and Maintenance Support

Last position:

Software Test and Maintenance Support at Anton Paar ProveTec GmbH

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

Benjamin E.

IC Design Lead & Design Team Lead

Bernau bei Berlin

Last position:

IC Design Lead & Design Team Lead at Cara Care

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

Mohamed K.

Interim Senior Camunda & BPMN Consultant, Spring Boot & Java Backend Developer

Last position:

Interim Senior Camunda & BPMN Consultant, Spring Boot & Java Backend Developer at GEMA/IT4IPM GmbH

Subject matter expert for the client on modeling and developing Camunda BPMN 2.0
Development of new features and APIs, and coordination of tasks
Design and development of RESTful APIs with Swagger (code first)
Creation of target designs, high-level concepts, and requirement specifications
Analysis and evaluation of alternative solution approaches
Integration of external IT systems (ANUBIS, SES, ZPS) via Google GCP Pub/Sub and RESTful web services
Pair programming, code reviews, and collaboration with API product owners
Consulting on transforming legacy BPMN workflows and configuring Camunda BPM
BPMN and DMN modeling and implementation in short iterations
Operational support, bug fixing, and knowledge documentation
Use of TDD, static code analysis with SonarQube, and integration tests
Automation of test cases in Java and analysis of stack traces/logs on GCP-PROD
Identification and execution of test data and documentation of test results

Beserithan M.

SAP All-round Developer

Last position:

SD Development and CRM Interaction Center Development at Sanner GmbH

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

János T.

Media Design

Last position:

Project management, typesetting, final artwork, creation of language variants at Regiolux GmbH

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.

Taha H.

Senior Salesforce Developer