Founding Software Engineer (AI Evaluation Infrastructure)

Location: San Francisco, CA (FiDi)

Employment Type: Full-time

Work Arrangement: On-site (6 days a week in office)

About the Role

Our client, is a high-growth AI startup that is building the most complex infrastructure for frontier data creation and evaluation for LLMs and AI Agents. They work with all five of the leading AI labs and top-tier YC companies, reflecting their sharp growth rate and talent density. The company is backed by $3 million in funding and features a founding team from rigorous environments like Citadel Securities, Google, and Meta.

They are seeking a Founding Software Engineer for a high-impact, non-narrow role with end-to-end ownership. You will operate across the full stack and infrastructure, contributing directly to systems that push the frontier of AI evaluation.

What You’ll Do

AI Solution Engineer (Product-Led Onboarding)

Location: San Francisco, CA (Jackson Square)

Employment Type: Full-time

Work Arrangement: On-site

About the Role

Our client, is a rapidly growing AI company focused on empowering enterprises to deploy and scale AI-powered phone agents. They have raised $65 million from top investors, including Emergence Capital, Scale Venture Partners, and the founders of Twilio and ElevenLabs.

They are seeking an AI Solution Engineer who acts as a "product owner" for each customer's onboarding journey. This role is a blend of technical savvy, solutions engineering, and product management, where your core mission is to manage and accelerate the deployment of a fully functional, AI-driven call flow in under two weeks per customer.

What You’ll Do

Founding Engineer (API Infrastructure, Insurance FinTech)

Location: San Francisco, CA

Employment Type: Full-time

Work Arrangement: On-site

About the Role

Our client is a venture-backed startup with enormous momentum, building the infrastructure layer for Property & Casualty (P&C) insurance. They are often described as "Plaid for Insurance," aiming to modernize the highly fragmented, analog, and manual workflows of the $2T global P&C industry through a simple, modern API. The company has already grown revenue 3x year-to-date in 2025.

They are seeking two highly autonomous engineers (employee #5 and #6) to play a foundational role. This position involves owning the design and implementation of a robust, API-driven product and helping define the future architecture and company culture.

Responsibilities

Member of Technical Staff - Applied AI / ML Engineer

Location: San Francisco, CA (Union Square)

Employment Type: Full-time

Work Arrangement: On-site 5 days a week

About the Role

Our client is a GenAI-native platform that automates complex tax document processing, serving top accounting firms and wealth management offices. The platform was recently acquired by Thomson Reuters and is operating as a fast-paced, high-growth startup within a larger structure.

They are seeking an exceptional Member of Technical Staff (MTS) focused on ML Product. This is a high-ownership role crucial for scaling their platform to millions of documents, requiring strong fundamental understanding of how to build, measure, and iterate on commercial ML systems for the enterprise.

What You’ll Be Doing

Senior Software Engineer (AI Healthcare Communication)

Location: San Francisco, CA

Employment Type: Full-time

Work Arrangement: Hybrid (4 days/week in-person)

About the Role

Our client is a rapidly growing, well-capitalized healthcare AI company focused on making exceptional healthcare accessible anytime, anywhere. They are building an AI-powered healthcare communication platform that uses voice agents as the first point of contact for medical practices, handling tasks from appointment scheduling to patient triage. The platform has facilitated over 30 million patient interactions and is growing rapidly (10x growth since January 2024).

They are seeking a Senior Software Engineer who is product-minded and passionate about transforming healthcare accessibility. You will be tasked with building and scaling their customizable fleet of GenAI agents (Assort OS) and working with cutting-edge AI through partnerships with companies like OpenAI and Gemini.

What You'll Do

Senior Software Engineer (AI & Logistics)

Location: San Francisco, CA Employment Type: Full-time Work Arrangement: On-site 5 days a week

About the Role

Our client is an AI startup backed by $17 million in funding that is focused on rebuilding the $1 trillion freight marketplace. They are fixing the slow, manual process of matching trucks with jobs by building a vertical AI agent that automates communication (phone calls, texts, and emails) for freight brokers and forwarders.

As an early Senior Software Engineer, you'll have a high-impact role driving the product's evolution. You'll be bringing AI to the transportation industry, owning product decisions, and shaping the core engineering culture. This is a fit for engineers who are excited about logistics, passionate about AI, and driven by great design and ownership.

What You'll Do

Founding Engineer

Location: San Francisco, CA (Union Square area)

Employment Type: Full-time

Work Arrangement: On-site

About the Role

Our client, is an applied AI research lab building high-fidelity agent environments and tooling with the bold thesis of becoming the single global workforce supplier of AI employees for the entire global economy. They are currently focused on conquering the frontiers of planning, memory, and "always-on-behavior" for their agents.

As a Founding Engineer, you will have a high-agency role, working directly with the CEO and founding team. Your contributions will go beyond just code, actively shaping the product, culture, and architecture. You must be prepared to ship fast, experiment, and iterate without heavy process.

What You'll Do

Location: San Francisco, CA

Employment Type: Full-time

On-site: 5 days a week in-office

About the Role

Our client, a high-growth AI company building advanced conversational AI agents for enterprises (with over $231 million in funding and clients like Duolingo and Notion), is seeking a Staff Data Scientist. This role demands deep technical rigor to analyze, test, and apply data across the business.

You'll blend advanced analytical expertise with product acumen to influence strategic decisions at the highest levels, being the primary driver of the experimentation culture.

What You'll Do

Location: San Francisco, CA (Mission District)

Employment Type: Full-time

Work Arrangement: On-site 5 days per week

About the Role

Our client, Automat, Inc., is a rapidly scaling enterprise AI company with $20 million in funding, focused on redefining Robotic Process Automation (RPA) and Intelligent Document Processing (IDP). Their mission is to make teaching AI agents to build automations as easy as showing a colleague the desired workflow.

They are seeking a product-minded Full-Stack Software Engineer to join their small, early-stage team. This is a high-impact role where your contributions will go beyond code, actively shaping the technical direction and culture. You will be responsible for building the robust, foundational product that supports their complex, large-scale customer deployments.

What You'll Do

Location: San Francisco, CA

Employment Type: Full-time

Work Arrangement: On-site (minimum 3 days per week)

About the Role

Our client, a venture-backed company aiming to revolutionize the networking industry by creating a vertically integrated infrastructure provider, is seeking a Model Engineer to join their founding core AI team. This is a high-impact role focused on transforming a market with hundreds of billions in revenue by applying cutting-edge machine learning to internet infrastructure.

You will be responsible for the full lifecycle of model development, from data to production deployment, and will directly collaborate with founders to define technical vision and team culture.

What You'll Do