Senior AI Engineer

About Us

Xtnsion.AI is building the agentic CX layer for modern businesses — AI voice + chat agents that autonomously handle bookings, lead follow-up, support workflows, CRM actions, and more across phone, WhatsApp, SMS, email, and web chat.

Our agents understand intent, retrieve context, take actions, and close loops — not just respond.

We’re growing fast across healthcare, clinics, D2C, and global SMBs, and we’re hiring a senior builder to help architect our core platform from the ground up.

About the Role

Senior AI Engineer (Founding Team)

You’ll design and build:

• Real-time voice + chat agents
• Agentic reasoning and workflows
• Memory + state management
• Deep API integrations (CRM, scheduling, support tools)
• Scalable backend + infra for AI systems

high-ownership, high-autonomy, zero-bureaucracy role.

What You’ll Own

• Architect the agentic workflow engine (reasoning, memory, tool use)
• Build real-time voice + chat agents using STT/TTS + LLMs
• Create deep integrations with CRMs, schedulers, helpdesks, databases
• Design scalable backend + infra for multi-channel agents
• Prototype fast, ship fast, and iterate with real customer feedback
• Work directly with the founder on product + architecture
• Lay the engineering foundation for the next 6–12 months of growth

What You Bring

• 4–7+ years of engineering experience
• Strong backend fundamentals (Python preferred)
• Deep understanding of full-stack system design — backend services, SQL data modeling, and production-grade Python engineering
• Expert-level understanding of APIs — requests, auth flows, webhook systems, rate limits, and complex third-party integrations
• Hands-on with LLM APIs, LangChain/LangGraph, agent orchestration
• Strong grasp of Generative AI fundamentals — RAG, embeddings, retrieval design, structured outputs, and tool-using agents
• Experience deploying and maintaining production systems — Docker, servers, environment management, and dev/stage/prod setups
• Architectural intuition around scalable systems — queues/workers, caching, load balancing, service boundaries, and latency-aware design
• Experience with chat/voice systems or workflow automation
• Comfortable using AI-augmented developer tools (Cursor, ChatGPT, Gemini, Claude) to accelerate prototyping and development
• Comfortable integrating complex APIs
• Thrive in zero-to-one environments, ambiguity, and high ownership

Why You’ll Love This

• Direct collaboration with the founder
• Massive ownership and zero bureaucracy
• Build systems that thousands will interact with daily
• Remote-first, flexible, output-driven culture
• Path to Lead Engineer / Head of Engineering

If you’re a builder, problem-solver, and 0→1 engineer, let’s talk.