Artificial Intelligence Engineer

About BuyBuildSell InfraTech:

We're an early-stage, self-funded startup building a unique AI-native platform for construction in India - design, manpower and material, brought together as one intelligent system. We're hiring the founding engineer who'll architect the AI at the center of it.

The Role:

This isn't a seat inside a large team executing a settled spec. As our founding AI engineer, you'll build the systems that take a client's plain-language request and turn it into real design options, specifications and material requirements - the kind of output a professional could actually stand behind, not just something that looks convincing. What you ship in your first few months becomes the foundation everything else is built on.

What You'll Do:

• Build the AI reasoning layer - LLM-based intent parsing, option generation, retrieval-grounded suggestions
• Architect the deterministic engine - rules-based calculations for specs, quantities and cost, kept strictly separate from anything AI-generated
• Own the full stack - backend, APIs, data, frontend and infrastructure, end to end, with no platform team to hand off to
• Ground the system in reality - work with our architects and structural engineers to encode real construction rules
• Shape the roadmap - sit close to real usage and help decide what gets built next, not just how

Required:

• B.Tech / B.E. in CS, AI/ML or related
• 2-5 years shipping production software
• Hands-on LLM integration - prompt design, structured output, RAG fundamentals
• Proven end-to-end ownership: backend, data, enough frontend/deploy to ship solo
• Can explain, unprompted, why critical logic belongs outside an LLM call

Preferred:

• Early or founding engineer experience at a startup
• Exposure to construction, real estate or physical-world marketplaces
• Computer vision or vernacular NLP exposure (part of our future roadmap)
• Production RAG / vector search experience - not just tutorials

What We Offer:

• Real architectural ownership - your early decisions become the platform's foundation
• Direct access to leadership - architects, structural engineers, the founder. No layers.
• Competitive salary and a level of technical decision-making authority you won't get as employee #200 elsewhere

Location: Saket, New Delhi (On-site)