Senior Backend Engineer (Python & FastAPI)

Job Title: Senior Backend Engineer (Python & FastAPI)

Experience: 6+Yrs

Location: Remote

Timing: 5:30 PM to 2:30 AM IST

Notice Period: Immediate Joiners Only

Role Overview

We are seeking a Senior Backend Engineer with strong expertise in Python and FastAPI to design and scale a high-performance document-processing backend. The system will handle large, complex PDFs and support AI-driven classification workflows.

Key Responsibilities

• Design and develop backend services to reliably process large PDF documents (200+ pages)
• Implement AI-driven document classification using taxonomy-based models with confidence scoring
• Build and maintain document taxonomies for classification, grouping, and validation logic
• Enable multi-page document assembly using taxonomy rules and page-level signals
• Develop robust exception handling mechanisms (fallback flows, “needs review” pipelines)
• Implement audit trails and data lineage, including taxonomy versioning and classification rationale
• Optimize system performance to ensure scalability and cost-efficient AI inference
• Support loan processing workflows by classifying and validating borrower documents (KYC, income proofs, bank statements, agreements, etc.)

Required Skills & Experience

• 4+ years of hands-on experience in Python development
• Strong expertise in FastAPI for backend services
• Experience with PDF processing libraries such as PyPDF2, pdf2image, or similar
• Hands-on experience integrating LLM APIs (preferably GPT-4 Vision or similar)
• Experience working with Google Cloud Platform (GCP)
• Cloud Storage
• Firestore
• Cloud Tasks
• Strong understanding of:
• Asynchronous job processing (queues, workers, retry logic)
• Error handling and fault tolerance
• Data lineage and audit systems
• Experience in:
• Document taxonomies / classification schemas
• OCR or document processing systems
• AI-driven workflows and structured labeling systems