Staff Software Engineer Agentic Products

Facility Grid LLC; Waltham (MA); Remote; USD 180,000 - 225,000; Full time

Benefits offered by this job

Health insurance

Paid time off

Vision insurance

401(k) matching

Bonus based on performance

Dental insurance

Job summary

Facility Grid LLC is seeking a senior engineer to lead the design and implementation of an agentic product suite atop our system of record, plus the AI platform that supports it. You will also guide modernization of a legacy PHP/Angular stack, while maintaining hands-on leadership and daily coding.

You will shape how agents are built, evaluated, and shipped, with autonomy to decide techniques and tooling. This is a senior, staff-level role with responsibility for end-to-end delivery.

Qualifications

• Ownership: you own problems end to end and are accountable for what you ship.
• Curiosity about code: you understand the whole system and read unfamiliar code well.
• Forward-looking engineering: you work agent-first with evolving tools and harnesses.
• Technical fundamentals: you can reason about distributed systems and trade-offs.

Responsibilities

• Design and build the agentic product suite from prototype to production.
• Build the AI platform: evaluation, guardrails, context management, and agent harnesses.
• Set standards for AI features: design, test, and rollout with the team.
• Modernize the legacy PHP/Angular applications.
• Evaluate new models and tooling and adopt the best options.

Skills

Ownership

Curiosity about code

Forward-looking engineering

Technical fundamentals

Tools

Claude Code

ChatGPT

Copilot

Job description

Benefits:

• Health insurance
• Paid time off
• Vision insurance
• 401(k) matching
• Bonus based on performance
• Dental insurance

About Facility Grid

Facility Grid builds commissioning and turnover software for the teams that bring large buildings online: data centers, airports, hospitals, and commercial real estate. Our platform is the system of record proving every piece of equipment was installed, tested, and accepted. Founded in 2012 and backed by Nexa Equity, we are about 30 people with a small, onshore engineering team that is growing.

The role

We are building an agentic product suite on top of our system of record: agents that do real commissioning work inside the product, with a human in the loop where it matters. We have modern infrastructure, a decade of customer data, and a small team that already builds with agents every day. We need a senior engineer to lead the design and implementation of that suite and the AI platform underneath it.

You will set the direction for how agents get built, evaluated, and shipped here, and you will build them. There is also a legacy PHP and Angular application that needs modernizing, and you will lead that too.

This is a hands-on staff role with a lot of autonomy. You decide how the work gets done. You write code every day, mostly through agents you direct.

What you will do

Design and build the agentic product suite, from prototype to production.

Build the AI platform it runs on: evaluation, guardrails, context management, and agent harnesses.

Set the standards for how AI features get designed, tested, and rolled out, and bring the team along.

Modernize the legacy application layer.

Evaluate new models and tooling as they ship and adopt what is better. We stay model-independent.

What we are looking for

We optimize for four things and we test for each of them in the interview loop.

Ownership. You take problems end to end without waiting to be asked. You own what you ship all the way to production and you are accountable for it there.

Curiosity about code. You want to understand how the whole system works, including the parts you did not write, and you read unfamiliar code well.

Forward-looking engineering. You already work agent-first with tools like Claude Code: handing off whole features, running several agents in parallel, building the harnesses around them. You expect this to keep changing every few months and you keep up. Using ChatGPT for lookups or Copilot for autocomplete does not meet this bar. Informed skepticism about where these tools fail is welcome.

Technical fundamentals. You can reason about a distributed system, trace a request through it, and defend the trade-offs in something you designed.

Language and framework background are secondary.

What we offer

Fully remote. Real autonomy over how you lead and build. The latest models and tooling, and a greenfield agentic product suite to design from the ground up.

How we interview

Hiring manager screen (30 minutes).

Code reading session (45 minutes). No take-home and no live coding. We share real code with real bugs and you talk us through it.

Systems design (60 minutes).

Compensation and location

Fully remote in the US. We have an office in Waltham, MA if you want one. $180,000 to $225,000 base depending on experience, plus a 10 to 20 percent annual cash bonus. Full benefits including medical and dental.

Facility Grid is an equal opportunity employer.

This is a remote position.