Founding Backend Engineer – Developer AI Startup

Rnb Consultancy; San Francisco (CA); Presencial; USD 200.000 - 250.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Base salary: $200k–$250k

Equity: 0.5–1%

On-site in San Francisco

Descripción de la vacante

Rnb Consultancy in San Francisco is seeking a third backend engineer to own the core backend and sandboxes that run coding-agent sessions.

You will ship features to customers within days, defend architectural choices at a weekly roundtable, and scale performance as usage grows. This is a hands-on IC role with full ownership from day one.

Formación

• Built backend systems for production from scratch.
• 3+ years in hands-on startup environments.
• Wants to stay an individual contributor (IC).
• Comfortable working directly with coding agents daily.
• SF office five days a week; no remote or hybrid.
• Authorized to work in the US without visa sponsorship.

Responsabilidades

• Own the core backend and sandboxes that run coding-agent sessions.
• Ship to customers and iterate quickly based on feedback.
• Defend architectural decisions at weekly round tables.
• Ensure performance and scale as usage grows.

Conocimientos

Backend systems

System design

Performance at scale

Technical decision making

Herramientas

AWS

Docker

PostgreSQL

TypeScript

Descripción del empleo

You've built backends from scratch and you use coding agents every day. Own the infrastructure that runs them at scale.

A seed-stage startup in San Francisco runs real coding sessions in popular AI coding agents so developer-tool companies can see their product through an agent's eyes: does the agent choose it, can it work with it, and where does it struggle or go elsewhere? Well-known developer-tool companies already rely on it. As the third engineer, you'll own the core backend within your first few months.

What you'll own

• The sandboxes, AI gateway and orchestration that run large numbers of coding-agent sessions
• Shipping to customers, gathering feedback and shipping again within days
• Your own technical decisions, defended at a weekly round table where the best idea wins
• Performance and scale as usage grows

Must-haves

• You've created backend systems for production yourself, from a blank page, and can explain each choice (relying on a separate infra team for deployment isn't the same)
• 3+ years of experience, with your latest role as a hands-on engineer at an early-stage, fast-growing startup
• You want to stay an individual contributor
• Comfortable working with coding agents every day
• Working from the San Francisco office five days a week, 9-9-6 (no remote or hybrid)
• Authorised to work in the US without visa sponsorship

Bonus points

• Agent sandboxes, AI gateways or agent infrastructure on AWS and containers
• Postgres, ClickHouse, TypeScript or Python
• Founding engineer more than once, open-source work, side projects with real users or agent hackathons

What's in it for you

• $200k-$250k base + 0.5-1% equity
• Full ownership of the core backend as one of the first engineers
• A team that ships in days, not weeks

Good to know

• Full-time, on-site in San Francisco, 9-9-6
• No visa sponsorship for this role
• Process: first screen 60-minute technical interview (a walk-through of a system you built and a short system-design exercise) on-site in San Francisco offer