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oleksiikrakhmalov/README.md

Hi πŸ‘‹, I'm Oleksii K.

Fintech & AI Engineer Β· LLM / RAG Β· QuickBooks Β· Xero Β· Stripe Β· Servis.ai

Typing SVG


πŸš€ About Me

I build AI-powered finance systems that turn messy financial data into accurate, audit-ready answers β€” and keep accounting, payments, and CRM systems in perfect sync.

  • πŸ”­ I build end-to-end accounting & payments integrations (QuickBooks Online, Xero, Stripe) synced into a single source of truth
  • πŸ€– I build AI finance assistants β€” RAG over invoices, contracts, statements & GL data with cited, traceable answers
  • πŸ“„ I handle financial document ingestion β€” invoices, receipts, bank statements, W-9/1099s β†’ structured data with OCR fallback
  • πŸ” I ship idempotent syncs, reliable webhooks, and reconciliation engines that never double-post
  • 🎯 My north star: every figure traceable to its source document, line item, or transaction ID

πŸ› οΈ Tech Stack

Accounting / Payments

AI / LLM / RAG

Vector DBs / Embeddings

Backend

Frontend

Infra / DevOps


πŸ“Œ Featured Projects

🧾 Invoice Automation Platform

Full-stack web app that automates invoicing for a title-and-registration business, keeping three systems β€” QuickBooks Online, a GraphQL CRM, and the client's internal app β€” in perfect sync.

  • Ingests messy vendor batch files (PDF / Excel / CSV) β†’ unified invoice schema with LLM-assisted extraction
  • Template-matching engine auto-generates QuickBooks invoices
  • Two-way payment sync via webhooks β€” payments, refunds & status updates flow bidirectionally
  • Customer de-duplication + idempotent sync layer β†’ zero duplicates across systems

Next.js (App Router) Β· React 19 Β· TypeScript Β· Azure SQL Β· QuickBooks Online API Β· GraphQL/REST Β· OAuth 2.0

πŸ€– AI Finance Assistant (RAG)

Cited, audit-ready Q&A over 50k+ invoices & statements with full source traceability and <2s p95 latency.

Python Β· FastAPI Β· LlamaIndex Β· GPT-4o Β· Qdrant Β· PostgreSQL

πŸ”— QuickBooks + Stripe Reconciliation Engine

Auto-matched 120k+ monthly transactions at 99.2% accuracy, cutting manual review by 90%.

Python Β· Stripe Webhooks Β· QuickBooks Online API Β· idempotent sync


πŸ“Š Recent Results

Project Scale Outcome
QuickBooks + Stripe reconciliation 120k+ tx / month 99.2% auto-match, βˆ’90% manual review
AI finance Q&A 50k invoices & statements Cited answers, <2s p95, full audit trail
Xero AP automation 18k invoices / month 98.7% parse success via OCR fallback

πŸ“ˆ GitHub Stats


πŸ“¬ Let's Work Together

Send me your stack (QuickBooks / Xero / Stripe / Servis.ai), data volume, and the accuracy bar you need to hit β€” I'll reply with an integration approach and the two or three risks I'd tackle first.

⭐️ Every number traceable. Every sync idempotent. Every answer cited.

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