FullStack Developer - On Site in San Francisco
Role Overview
This senior-level full-stack engineering role involves designing, developing, and maintaining AI agent platforms using TypeScript across frontend and backend. The engineer will work with cloud infrastructure (GCP/AWS), build deployment pipelines, and take full ownership of projects from ideation to implementation. They'll join a small, collaborative startup team where they'll have significant impact shaping core product features and developing reusable tools for rapid AI agent creation.
Perks & Benefits
This is a 100% on-site position in San Francisco requiring 5 days/week in office, with competitive compensation including $225k-$275k salary for principal engineers plus meaningful equity. Benefits include fully covered basic health/dental/vision insurance, commuter benefits for parking and train, catered meals, and office snacks. The role offers high impact within a small senior team, rapid iteration environment, and significant ownership over projects.
Full Job Description
Principal / Senior Full-Stack Engineer (AI Agents) – San Francisco
Location: San Francisco, CA (4th & King) — 100% on-site, 5 days/week
Employment Type: Full-time
Salary Range:
Principal Engineer: $225k–$275k + meaningful equity
Senior/Staff Engineer: Flexible depending on autonomy and experience
About the Company
We are a fast-growing, 10-person startup based in San Francisco, building next-generation AI agents powered by the latest models from OpenAI and Anthropic. Since January 2023, the team has been designing, testing, breaking, and refining agent architectures—developing rare and deeply practical expertise in the space.
We offer a highly collaborative environment with significant ownership, rapid iteration, and the opportunity to shape core parts of the product.
The Opportunity
We are hiring 5–10 Full-Stack Engineers over the next 12 months to accelerate the development and scalability of our AI Agent platform. We’re looking for highly autonomous engineers with deep technical experience who thrive in ambiguous, fast-paced environments.
Responsibilities
Design, develop, and maintain full-stack features using TypeScript.
Build and optimize AI agents using state-of-the-art LLMs.
Work with GCP (primary) or AWS, infrastructure-as-code, and deployment pipelines.
Take full ownership of projects—from ideation and architecture to implementation and maintenance.
Develop reusable tools, prompts, and frameworks for rapid agent creation.
Proactively identify problems, propose solutions, and execute independently.
Contribute to architectural decisions and engineering best practices.
Ideal Candidate Profile
Experience
10+ years of engineering experience, used as a proxy for deep ownership—not just tenure.
Strong experience in B2B SaaS environments.
Full-stack background with a focus on TypeScript.
Cloud experience with GCP (preferred) or AWS.
Prior AI agent experience is a plus but not required.
Technical Skills
Full-stack TypeScript (frontend + backend).
Strong system design and architectural skills.
Experience with IaC, CI/CD, deployment workflows.
Familiarity with LLMs and genuine enthusiasm for AI innovation.
Mindset
Extreme ownership: Takes responsibility for outcomes end-to-end.
High agency: Proactively finds and solves the right problems.
Comfort with ambiguity: Thrives where specs evolve quickly and iteration is constant.
Not a good fit: Engineers who need rigid scope, structure, or step-by-step direction.
Compensation & Benefits
Competitive salary:
Principal: $225k–$275k
Senior/Staff: flexible based on autonomy and performance
Meaningful equity, benchmarked against Pave and Color.
Health, dental, and vision insurance (basic plan fully covered).
Commuter benefits (parking & train).
Catered meals and office snacks.
High-impact role within a small, senior team.
Interview Process
Hiring Manager Screen (remote)
Coding Challenge (remote)
Onsite in SF:
45 min: System Design
45 min: Past Projects Deep Dive
45 min: Founder Conversation / Collaboration
Offer stage after references
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