Technical Lead

Feltsense; San Francisco (CA); On-site; USD 200,000 - 280,000; Full time

Job summary

FS Holdings is seeking a Head of Engineering to own the multi-agent orchestration system, the self-evolving harnesses, and the engineering standard that underpins our autonomous platform.

You will own system architecture, break large problems into first wins, ship production code, recruit senior engineers, and partner with the founder, product and operations to translate goals into actionable plans.

Qualifications

• Experience leading engineers at an early-stage company.
• Proven ability to architect multi-agent systems and orchestration in production.
• Strong backend and API design experience.

Responsibilities

• Own the system architecture and make the technical calls; move the team through decisions.
• Break large problems into first wins and sequence the roadmap.
• Ship production code, especially on agent runtime and orchestration.
• Recruit senior engineers and lead hiring for the team.
• Partner with founder, product and operations to translate goals into engineering plans.
• Improve AI behavior in production; drive prompt quality and fallbacks.

Skills

Leadership at early-stage

Multi-agent systems

Backend APIs

Prompt engineering

Cross-functional comms

Product-technical collaboration

Tools

TypeScript & Node.js

Vercel AI SDK

Claude Agent SDK

Postgres/pgvector

Job description

We raised $5.1M to build agents that operate as fully autonomous founders. Our backers include Matt Schlicht (founder of Moltbook), the founders of Crunchbase and Republic, and VCs including Draper, Precursor, and Liquid2. We’re working at the frontier of autonomous systems, laying the groundwork for agents that don’t just chat, but run entire businesses.

The system sources ideas from market signals, validates them with live ad tests, builds and launches software products, and brings in human experts wherever the agents fall short. That loop already runs end to end: from idea, to launched product, to first revenue. The next 12 months are about reliability, throughput, and self-improvement, so that every launch makes the next one better.

We’re hiring a Head of Engineering to own that system: multi-agent orchestration, self-evolving harnesses, the engineering standard, and the team that builds it.

What you'll work on

• Multi-agent systems and orchestration: the agent runtime that takes a product from idea to live ads to launched software, and its reliability, latency, and cost in production
• Self-improving and self-evolving harnesses: the feedback loops, evaluation, and memory that let the system learn from each launch and from human expert input
• Technical direction and sequencing across the whole system: idea sourcing, ad-based validation, the product builder, and the human-in-the-loop layer
• Engineering standards: code review, testing, observability, release process, and definition of done
• Building AI-powered backend services on top of LLM APIs (Anthropic, OpenAI, Gemini)
• Hiring and growing the engineering team

Core responsibilities

• Own the system architecture and make the technical calls; move the team through decisions rather than toward consensus
• Break a large technical problem into the first wins that build momentum, and sequence the roadmap around them
• Set and enforce the engineering bar across the existing codebase and team
• Ship production code yourself, especially on the agent runtime and orchestration
• Recruit the first two to three senior engineers, ideally people you have worked with before
• Partner closely with the founder and the product and operations team to translate product goals into engineering plans
• Debug and improve AI behavior in production; drive prompt quality, structured outputs, retries, and fallbacks

Required skills and experience

• 7+ years of professional software engineering experience, including leading engineers at an early-stage company (founding engineer, tech lead, head of engineering, or similar)
• Hands-on experience at the bleeding edge, specifically multi-agent systems and orchestration, and self-improving or self-evolving agent harnesses, shipped to production
• Strong backend engineering skills, including designing, building, and maintaining APIs and data flows
• Experience with prompt engineering, model configuration, structured outputs, embeddings, retrieval, and evaluation
• Daily, hands-on use of AI coding agents (Claude Code, Cursor, OpenAI Codex or similar). You plan work, hand it to agents, review what they produce, and know when to verify instead of trust
• Clear communication with a product-led founder and a non-technical operating team

Nice to have

• TypeScript and Node.js end to end; our stack is TypeScript throughout
• Vercel AI SDK, Claude Agent SDK, or experience building a custom agent runtime
• pgvector on Postgres/Supabase; background job systems such as Inngest or Pub/Sub
• Experience growing or restructuring a distributed team
• Interest in AI evaluation, safety, and observability

The pay range for this role is:

200,000 - 280,000 USD per year (FS Holdings HQ Address (California))