Paul Zimmermann

Full Stack Developer

Full stack developer with expertise in TypeScript, Python, Go, and React Native. Builds practical tools that automate workflows, reduce operational friction, and improve user experience. Bridges engineering, digital design, and psychology to create intuitive, robust systems. Experienced in OCR integration, CMS development, data migration, and SQLite3 optimization.

Work

Full Stack Developer

Freelance / Self-Employed
– Present

Design and develop custom web and mobile applications, data systems, and digital assets for diverse clients.

  • Engineered a keyword-based keycode retrieval system using SQLite3 and phased search algorithms.

  • Built a React Native OCR module that reads handwritten transaction data, reducing manual entry by approximately 80%.

  • Restructured a CMS from server-side to offline/file-based architecture for improved portability.

  • Created interactive CMS with visual text-to-image mapping using HTML, CSS, and JavaScript.

  • Designed and developed multiple websites, logos, labels, and social media assets.

Operations Lead & Tree Climber

Baumdienst Zimmermann
–

Led field operations, coordinated teams, and managed administrative tasks.

  • Supervised daily field operations and trained ground personnel.

  • Managed all client communication, billing, and tax documentation for a regional tree care business.

Bookkeeping Clerk & Customer Service

sports-box.de
–

Managed product data entry and Excel-based inventory systems. Provided email and chat support.

Warehouse Operative

m.i.s. GmbH
–

Managed warehouse logistics and inventory coordination.

Digital Designer

digimedia services ltd.
–

Designed logo and website for a public school.

Content Manager

debitel-competenz-center
–

Managed product listings and data entry for telecommunications products on eBay.

Web Content Administrator

Starke Internethandel
–

Maintained homepage and managed data entries for electronic products on eBay and Amazon.

File Search Clerk

Skandia GmbH
–

Managed file organization and document retrieval.

Education

boot.dev

Backend Engineering
–

Certificate

TU Chemnitz

Psychology
–

Bachelor of Science

L4 Academy

Digital and Print Design
–

Vocational Certificate

Projects

Ojo del Banco

–

React Native banking module with on-device OCR for handwritten transaction data.

  • Integrated GutenyeOCR with ONNX runtime.

  • Auto-populates transfer fields, reducing manual entry by ~80%.

  • Optimized for Mexican banking formats.

  • Open-source: https://github.com/Pajozim/OjoDelBanco

CMSwTPaL

–

Lightweight CMS with interactive text-to-image mapping.

  • Allows users to link text paragraphs to specific image areas.

  • Built with HTML, CSS, and JavaScript.

  • Restructured to offline/file-based architecture.

Stranded

–

Visual novel game with resource management.

  • Built with Twine and SugarCube (HTML, CSS, JavaScript).

  • Features AI-generated audio-visual elements.

Keycode Retrieval System

– Present

System for retrieving keycodes via phased keyword search.

  • Migrating Excel data to SQLite3 for faster queries.

  • Building flexible UI for dynamic parameter inputs.

Certificates

English B2 / Business B1

Issued by Cambridge / TOEIC

Spanish A2

Issued by Instituto Cervantes

Digital and Print Design

Issued by L4 Academy

Driving License

Issued by German Authorities

Skills

Programming Languages

  • TypeScript
  • Python
  • Go
  • JavaScript
  • HTML
  • CSS

Frameworks and Libraries

  • React Native
  • Node.js
  • Twine
  • SugarCube

Databases

  • SQL
  • SQLite3
  • PostgreSQL
  • MongoDB
  • Data Migration

DevOps and Cloud

  • Docker
  • AWS
  • CI/CD
  • Linux
  • Git

Design and Creative

  • Inkscape
  • Canva
  • Framer
  • Squarespace
  • Wix
  • GIMP
  • CapCut
  • DaVinci Resolve

Other

  • Power BI
  • Excel
  • REST APIs
  • Agile
  • UX/UI
  • Psychology
  • Graphic Design

Languages

German

Native

English

Professional (B2)

Spanish

Elementary (A2)