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Dexta — AI-Powered Recruiter Assessment Platform

311-endpoint NestJS platform with LangChain RAG advisor, Puppeteer proctoring, and Stripe billing.

311API Endpoints
Gemini 2.5 FlashAI Model
3 BullMQ QueuesQueue Workers

Overview & Purpose

A comprehensive SaaS platform that automates candidate evaluation through AI-generated tests, proctored sessions with deepfake detection, and a conversational LangChain agent that helps recruiters select the right assessment modules. Stripe subscription billing, BullMQ async job queues, and Redis distributed locking ensure correctness at scale.

Key Technical Highlights

  • RAG pipeline: CohereEmbeddings → ChromaDB vector store → Gemini dialogue management
  • Redis NX/EX distributed lock prevents assessment double-submission across multi-instance deployment
  • Three dedicated BullMQ queues: proctoring, AI cultural-fit scoring, and report generation
  • Puppeteer headless Chromium converts HTML reports to branded PDFs with injected company logos
  • Stripe Free/Pro/Enterprise subscription tiers with automatic invoicing and webhook billing events