Lead/Snr Full-Stack Engineer (Node.js/Python/LLM/prompt engineering)

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 complaint.
• 🔧 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 Сloud 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.

A few words about us: