Founding Engineer (In-Person)

Raycaster (Yc F24); New York (NY); On-site; USD 140,000 - 200,000; Full time

Benefits offered by this job

Equity 2–10%

In-person NYC office

Job summary

Raycaster is hiring in NYC for a backend/frontend engineer who will own critical subsystems, including agent orchestration and document pipelines. You will ship end-to-end Go backend and React UI, building reliable systems with evals, guardrails, and strong observability.

You’ll talk to users to turn customer pain into product, own subsystems, and contribute to performance, concurrency, and distributed systems. In-person work at NYC office with equity offered.

Qualifications

• Built and shipped real systems in Go or Rust.
• Own a subsystem; strong fundamentals in distributed systems.
• Experience with AI/LLM features in production.
• High attention to detail and product taste.
• Ability to learn quickly and figure out unknowns in hours.

Responsibilities

• Maintain agent orchestration, document pipelines, versioning.
• Ship end-to-end Go backend and React UI.
• Improve reliability with evals, guardrails, observability.
• Engage with users to translate pain into product.

Skills

Go

Rust

Distributed systems

Concurrency

Performance

LLM in prod

React

Go backend

Job description

What you’ll do

• Maintain the core: agent orchestration + document pipelines + versioning
• Ship end-to-end: Go backend + React UI (you’ll touch everything)
• Make it reliable: evals, guardrails, observability (no demo-only systems)
• Turn customer pain into product fast (you’ll talk to users)

What We Care About

• You’ve built and shipped real systems (Go/Rust preferred). You can own a subsystem.
• You’re strong on fundamentals: distributed systems, concurrency, performance
• You’ve shipped AI/LLM features in production, and you learn new things insanely fast and can prove it
• You have high attention to detail + high standards
• You have product taste: you notice UX/copy/states, not just code
• If you don’t know something, you figure it out in hours - not weeks

Nice to have

interest in biotech, healthtech, or any regulated industry

Research angle (optional)

We’re working on agent / domain-specific evals, new embeddings and indexing benchmarks, and may publish benchmarks / deep dives and submit to conferences / journals. If you want to help set standards for this space, there’s room.

Logistics

• NYC, in-person, 5 days/week (we build better together)
• Competitive base + founder-level equity (2–10%)

Apply

send (1) GitHub / past systems you built, and (2) one paragraph on why you’re interested in working at Raycaster to founders [at] raycaster.ai