Backend/ AI Engineer (Python/Node.js) - Full-time - EU

Position Overview

We are seeking two skilled Freelance Backend Engineers to join our team asap, focusing on building
robust server-side applications with a strong emphasis on AI integration and document processing
capabilities

The ideal candidates will have expertise in Python and Node.js, with experience in database management
and a passion for leveraging commercial LLMs to solve complex data extraction challenges

• Minimum 5 years of professional experience (AI, ML, NLP, or related fields)
• Strong problem-solving mindset with the ability to design scalable solutions under ambiguity
• Ideally german-based, not hard requirement (Europe time zone)
  ️

Key Responsibilities

Core Development

• Design and develop scalable backend systems primarily in Python with occasional Node.js projects
• Build and maintain RESTful APIs and microservices architecture
• Implement efficient database solutions using PostgreSQL with advanced ORM frameworks
• Write clean, maintainable, and well-documented code with comprehensive test coverage
  AI & LLM Integration
• Integrate commercial Large Language Models (OpenAI GPT, Anthropic Claude, Google Gemini) into
  backend systems
• Design and implement AI-powered features for document analysis and data extraction
• Develop prompt engineering strategies for optimal LLM performance
• Build workflows for processing various document formats (PDF, Word, Excel, images)
• Create automated data extraction pipelines with validation and error handling
  Data Management
• Design and optimize database schemas for complex data relationships
• Implement efficient data processing workflows for large-scale document handling
• Build ETL pipelines for structured and unstructured data
• Ensure data integrity, security, and compliance with relevant regulations
  System Architecture
• Contribute to architectural decisions for scalable, maintainable systems
• Implement proper error handling, logging, and monitoring solutions
• Optimize application performance and database queries
• Design fault-tolerant systems with proper backup and recovery mechanisms
  ️

Required Technical Skills

Programming Languages

• Python (primary) - Expert level with 5+ years of experience
• Node.js - Intermediate level for specific projects
• Experience with TypeScript is a plus
  Database & ORM
• PostgreSQL - Advanced knowledge including query optimization, indexing, and performance tuning
• SQLAlchemy (Python) - Expert level for complex data modeling
• Prisma (Node.js) - Intermediate level
  AI/ML Integration
• OpenAI API - Experience with GPT models, embeddings, and fine-tuning
• Anthropic Claude - Knowledge of API integration and prompt optimization
• Google Gemini - Familiarity with multimodal capabilities
• Understanding of token management, rate limiting, and cost optimization
  Document Processing
• PDF processing libraries (PyPDF2, pdfplumber, pymupdf)
• OCR technologies (Tesseract, cloud OCR services)
• Document parsing for various formats (docx, xlsx, csv)
• Computer vision for document layout analysis (optional but preferred)