Senior Software Engineer - Core Infrastructure

Build Technologies•San Francisco, CA

1d•$170,000 - $245,000

About The Position

This role is responsible for the infrastructure that orchestrates autonomous agents, manages long-running, high-stakes workflows, and guarantees reliability at institutional scale. Your work sets the hard limits of speed, autonomy, and trust across the entire product. You will build and operate the core primitives: agent orchestration, workflow engines, state management, eventing, and execution reliability. You will design systems that survive real-world failure modes: partial data, human handoffs, long timelines, regulatory constraints, and zero tolerance for silent errors. You will make architectural decisions that directly determine product capability, velocity, and customer trust. You will own infrastructure end-to-end: design, implementation, testing, deployment, observability, and ongoing evolution. You will work tightly with product, applied AI, and domain experts to translate abstract workflows into durable, production-grade systems. You will set the technical bar for robustness and clarity; other engineers build on what you create.

Requirements

Relentless in asking the right questions to set direction.
Go all-in once the right direction is found.
Obsess with being the best; excellence is a non-negotiable standard.
Choose to be in something for the long run.
Take full ownership of the outcomes.
Meticulous in pursuits and believe you can actively shape your environment.
Passion for the built world and those who shape it.
Integrity; choose to do the right thing even when it isn’t easy.
Trustworthy.
Burning need to see a result on every action taken.
Always looking for routes to do more with less.

Responsibilities

Build and operate the core primitives: agent orchestration, workflow engines, state management, eventing, and execution reliability.
Design systems that survive real-world failure modes: partial data, human handoffs, long timelines, regulatory constraints, and zero tolerance for silent errors.
Make architectural decisions that directly determine product capability, velocity, and customer trust.
Own infrastructure end-to-end: design, implementation, testing, deployment, observability, and ongoing evolution.
Work tightly with product, applied AI, and domain experts to translate abstract workflows into durable, production-grade systems.
Set the technical bar for robustness and clarity; other engineers build on what you create.

Benefits

Radical autonomy, real ownership
High standards. Minimal bureaucracy.
Own problems end-to-end, choose how the work gets done, and are accountable for exceptional outcomes.
Ownership is matched with meaningful, generous equity.
An accelerated founder’s track: learn what it actually takes to create a generational company – Product judgment, execution speed, and accountability.
Elite teammates, uncompromising bar.
Work with people who think clearly, execute relentlessly, and take full ownership.
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: Rebuilding how the physical world gets made.
Software doesn’t live in the abstract - it turns into real projects breaking ground because we exist.
Work with the largest institutions, push the frontier of AI, and watch our decisions translate directly into the world around us.