Lead/snr Full - stack Engineer (node.js/python/llm/prompt Engineering) - Remote Eligible

Lead/Snr Full-Stack Engineer (Node.js/Python/LLM/Prompt Engineering)

We are looking for a skilled Software Engineer to join our team and help build a greenfield WhatsApp conversational bot embedded into our money remittance platform. This is not just another chatbot project — it combines AI-driven prompt engineering, human-centered conversational UX, and complex backend integrations for a product that will handle regulated, real-money transactions.

You'll be joining after the prototype stage, helping shape the long-term system architecture as we move from prototype to full-scale production, and directly influencing both the technical architecture and the user experience.

Position Opportunity:

• Want to work at the intersection of AI, human behavior, and software? Here, prompt engineering is not an afterthought — it's the heart of the product. You'll design prompts and flows that keep the conversation useful, natural, and on track, even when users try to take it sideways.
• Interested in designing how humans talk to machines? You'll be crafting natural language UX: guiding users who don't know the "script" through complex financial flows while keeping the interaction friendly, efficient, and compliant.
• Like building rock-solid backend systems? From integrating with the WhatsApp Cloud API to payment processing systems, you'll engineer services that connect AI conversations to real-world transactions.

What You'll Do:

• Design, implement, and refine prompt engineering strategies for LLM-based conversational flows using LangChain, LangGraph, and custom NLP logic.
• Collaborate with Product Owners, QA, and other developers to shape conversational UX — anticipating user needs, guiding them through scenarios, and handling unpredictable inputs gracefully.
• Develop and maintain backend systems in Python, NestJS, and Node.js for integrations with Meta's WhatsApp Cloud API, payment platforms, and internal services.
• Implement secure, compliant flows for transactions and personal data handling.
• Deploy and operate services in Docker/AWS using AWS CDK and modern DevOps practices.
• Contribute to the full development lifecycle: architecture, coding, testing, deployment, and monitoring.

We Expect You to Have:

• Deep knowledge and 5+ years of production experience
• Solid backend development skills with Node.js/NestJS (Python is a plus).
• Experience integrating with complex third-party APIs (payments, messaging, etc.). Proficiency in frontend development using JavaScript/TypeScript and React.
• Familiarity with Cloud and container technologies
• English proficiency – B2 or higher.

It Would Be a Plus To Have:

• Experience with Meta's WhatsApp Business Platform or other messaging APIs (Telegram, Viber, etc.).
• Experience with LangChain and LangGraph.
• Experience in business analysis and communications with users and stakeholders. Work on financial/payment-processing systems.
• Experience in building scalable and highly-available system architectures.
• Hands-on experience with Amazon Web Services (AWS).

We are pleased to offer you:

• Remote work opportunity!
• B2B Employment ($, gross).
• Really good hardware.
• An exciting and challenging job with talented people around.
• Great learning and growth opportunities.
• Compensation for professional training, seminars, and conferences.
• First-class English lessons.

IDT Corporation is a global communications company founded in 1990 and headquartered in Newark, New Jersey. We are industry leaders in prepaid communication and payment services and one of the largest international voice carriers.

We are listed on the NYSE, employ over 1800 people across 20 countries, and have over $1.5 billion in revenues.