AI Engineer - Assistant Experience

Build Technologies•New York City, NY

43d

About The Position

Build AI for the Built World: Build has created the agentic AI stack for institutional real estate, automating complex development and acquisitions workflows 90% faster than humans to accelerate the world's most important built projects - digital infrastructure, energy, industrial - from concept to completion. Our mission is to accelerate and amplify the world's most important built projects - inventing a better way to build through a collaboration between human experts and agentic AI. We envision a future where the world's buildings are driven from concept to completion, autonomously. Without delays, cost, and complexity. Enabling people to deliver a magnitude more deals. To make decisions, build relationships and create. To start, we're partnering with the world's biggest built world institutions from $T alternative assets investors, prolific developers and even governments to push the frontier of what's possible. We're backed by c-suite from Blackstone and OpenAI alongside the world's best venture capital firms. Join us in shaping the future of the Built World and exponentially accelerate your career in the process. We welcome you to do your life's work here. About the role Dougie is Build's agent harness - the agent that executes workflows, grades outputs, and holds institutional context across sessions. Right now Dougie is capable but not compounding: what it learns in one run does not reliably make the next one better. This role closes that loop. You will wire grading into execution, build the memory layer that makes Dougie smarter with every run, and close the gap between what Dougie can do in a demo and what it does reliably in production. You are accountable for human-in-the-loop time dropping every week.

Requirements

Has built agentic systems that run unattended with real consequences attached
Treats memory, context and retrieval as engineering problems rather than buzzwords

Responsibilities

Own and expand Dougie's capabilities end-to-end across Build's ontology for digital labor.
Wire grading and evaluation directly into the execution path, so runs improve themselves
Build the memory layer that carries institutional context across sessions
Instrument human-in-the-loop time and drive it down deliberately
Improve agent orchestration - planning, tool use, recovery from partial failure
Build the feedback path from expert correction back into system behaviour
Debug non-deterministic systems rigorously rather than by intuition
Own Dougie's behavior in production, including when it goes wrong

Benefits

Radical autonomy, real ownership
High standards. Minimal bureaucracy.
Ownership is matched with meaningful, generous equity.
An accelerated founder's track
Elite teammates, uncompromising bar.
Growth here is not just professional; it reshapes how you operate and in return how Build operates.
Perpetual adventure
Extraordinary experiences are part of the culture - from the food we eat together to the space we occupy.
Intensity is intentional.
Shape the built world