AI Engineer

Fluency; San Francisco (CA); On-site; USD 180,000 - 250,000; Full time

Benefits offered by this job

US$1,000 per month food and commuting allowance

Laptop of choice

ESOP available

Job summary

Fluency in San Francisco is hiring a full-time AI Engineer to create LLM-powered features and improve AI output quality. You will build new features end to end, partner with product engineers, and evaluate models. Applicants should have experience in TypeScript or Python and a strong foundation in software engineering, as well as hands-on experiences with LLM implementations. The role offers a competitive salary between $180,000 and $250,000, along with additional benefits like a monthly allowance and equity programs.

Qualifications

• Hands-on experience building LLM-powered features that shipped to real users.
• Production engineering chops in TypeScript/Node and/or Python.
• Solid software engineering fundamentals: writing production code.

Responsibilities

• Build new AI features end to end, from prototype to production.
• Improve AI output quality through prompt engineering and evaluation.
• Partner with the Product Engineer to translate requirements into AI features.

Skills

Experience building LLM-powered features

Production engineering in TypeScript/Node

Experience with multiple LLM providers

Prompt engineering and evaluation

Software engineering fundamentals

Tools

TypeScript

Python

AWS Lambda

Job description

We’re hiring a full‑time AI Engineer to own the prompts, agents, evals, and pipelines behind user‑facing features that ship to users.

You’ll take product requirements and turn them into working prompts, agents, and pipelines. You’ll evaluate them rigorously, iterate until they’re production‑ready, and keep improving them once they ship. This role sits at the intersection of product and platform: you decide what the AI should do, prove it works, and get it in front of users.

Because we’re an early‑stage company moving fast, we’re looking for someone who can work quickly through ambiguous AI problems, measure output quality, and ship only when the system is reliable enough for production. This is an in‑person role, 5 days a week in our office. The ability to tell the difference between "looks good in the demo" and "works in production" is essential.

Key Responsibilities

• Build new AI features end to end, from prototype to production.

• Improve AI output quality through prompt engineering, model selection, retrieval, and evaluation.

• Design and run evals that measure real output quality, not just first impressions.

• Iterate fast on prompts, agent designs, and orchestration patterns.

• Partner with the Product Engineer to translate requirements into AI features that actually work.

• Partner with the AI Platform team to land features on solid infrastructure.

• Evaluate new models, tools, and techniques when they improve quality, latency, cost, or reliability.

What We Are Looking For

• Hands-on experience building LLM-powered features that shipped to real users.

• Production engineering chops in TypeScript/Node (primary, especially in AWS Lambda) and/or Python.

• Experience with multiple LLM providers such as Anthropic, OpenAI, Google Vertex, AWS Bedrock, or similar.

• Practical judgment in prompt engineering, retrieval, and agent design, backed by evaluation results.

• Track record of building evaluation systems that actually catch regressions.

• Solid software engineering fundamentals: you can write production code, not just notebooks.

Nice to Have

• Experience with provider-abstraction libraries for multi-LLM workflows.

• Familiarity with pgvector or other vector retrieval systems.

• Experience with post-training or fine-tuning.

• Experience deploying AI features on AWS Lambda, ECS Fargate, or similar.

• Background in ML, NLP, or applied research.

• Experience with structured output, function calling, and tool use at scale.

• Experience with Anyscale Ray or similar distributed compute frameworks for batch inference, eval pipelines, or scaling agent workloads.

• Open source contributions in the LLM or agent tooling space.

Location

• Full-time, in‑person role based in San Francisco, CA.

• We offer E-3 sponsorship for Australians to relocate with stipend.

Compensation & Benefits

• Base salary: US$180,000 to US$250,000.

• ESOP: Available.

• US$1,000 per month food and commuting allowance.

• Laptop of choice.

We strongly encourage applicants from underrepresented backgrounds to apply. Diverse teams build better products.