Back-end Developer (OpenAI/Node.js/WhatsApp) PT Freelance - APAC/Europe

Role Overview

We are looking for a skilled Freelance Developer to create a WhatsApp Business chatbot with advanced AI capabilities. The aim is to develop a robust system that can handle text and voice interactions, leveraging AI technologies for intelligent responses. The project focuses on integrating AI features like GPT-generated replies and voice processing, with a strong emphasis on data security and user experience.

Responsibilities

• Configure and manage the WhatsApp Cloud API, including webhook setup, media download, and message sending.
• Integrate OpenAI Chat Completions with document retrieval using Relevance AI or Pinecone.
• Develop a per-user memory system with secure data storage and a "delete-my-data" feature.
• Implement voice transcription and text-to-speech synthesis using Whisper and neural TTS solutions (Azure, Google, or AWS).
• Containerize the application for deployment, using serverless architecture or a small virtual machine.
• Conduct light testing, prepare usage documentation, and provide a comprehensive hand-off walkthrough.

Required Skills

• Proven experience with the WhatsApp Business API, particularly the Cloud API.
• Proficiency in backend development using Node.js or Python.
• Expertise in OpenAI GPT and prompt design.
• Knowledge of vector search and retrieval-augmented generation (RAG) using tools like Relevance AI or Pinecone.
• Experience with speech-to-text and text-to-speech technologies, such as Whisper and Polly.
• Understanding of data security practices, including HTTPS, secret management, and GDPR concepts.

Nice to Have

• Familiarity with containerization and deployment on AWS or GCP.
• Experience in handling multi-tenant systems with isolated user data.