Senior AI Engineer - Build Production LLMs (Remote)

Brainfullstack Ltd.; San Francisco (CA); Hybrid; USD 185,000 - 235,000; Full time

Job summary

Brainfullstack Ltd. seeks a full-time engineer to own the design and delivery of production LLM systems, from retrieval and evaluation through serving and cost control. You will work with Team AI Systems, ensuring robust, scalable solutions that meet client needs.

The role invites a strong background in production software, hands-on experience shipping LLMs, and the ability to articulate evaluation methodologies clearly for clients and teammates in a fast-paced environment.

Qualifications

• Five or more years building production software.
• Shipped at least one LLM system that real users depended on.
• Comfortable arguing about evaluation methodology.
• Writes clearly enough that a client can read the design document.

Skills

Production software

LLM systems

Evaluation methodology

Technical writing

Job description

Own the design and delivery of production LLM systems, from retrieval and evaluation through to serving and cost control.

Team AI Systems

Type Full-time

Band $185k - $235k

Location San Francisco or remote (UTC-8 to UTC+2)

Applying for something else? Pick the speculative option at the end.

Full name *

Email *

Earliest start

Portfolio, GitHub or LinkedIn

Link to your CV

A link rather than an upload, so nothing of yours sits on our servers unnecessarily.

Why this role, and what have you built *

We would rather read four honest sentences than a cover letter.

I agree to Brainfullstack storing this application to consider me for this role. You can ask us to delete it at any time — see our contact page .

We reply within one week, either way.

What we look for

• Five or more years building production software
• Shipped at least one LLM system that real users depended on
• Comfortable arguing about evaluation methodology
• Writes clearly enough that a client can read the design document

Not every line has to be a yes. Apply if most of it sounds like you.

What happens next

• 01 A 30-minute conversation With someone you would actually work with. No recruiter screen, no take-home before we have spoken.
• 02 A paid work session Four hours, paid at contractor rate, on a problem close to real work. You keep whatever you build.
• 03 A deep-dive on your craft Ninety minutes on something you have done before. We ask about the decisions and the parts that went wrong.
• 04 A decision within a week Offer or not, with written feedback either way. We have never taken longer and do not intend to start.

We pay for the work session at contractor rate. Asking for unpaid labour from someone who already has a job is not a fair trade.