Lead/Senior Full-Stack Engineer

Summary

Join our team as a skilled Software Engineer to build a greenfield WhatsApp conversational bot integrated into our money remittance platform. This role combines AI-driven prompt engineering, human-centered conversational UX, and complex backend integrations for real-money transactions. You will help shape the long-term system architecture, moving from prototype to full-scale production, and directly influence both the technical architecture and user experience. You will design prompts and flows for natural and useful conversations, craft natural language UX for complex financial flows, and engineer services connecting AI conversations to real-world transactions. The position offers a unique opportunity to work at the intersection of AI, human behavior, and software.

Requirements

• 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

Responsibilities

• 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

Preferred Qualifications

• 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)

Benefits

• 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