Founding Backend Engineer

ALL KNOWN SERVICES; California; On-site; USD 140,000 - 210,000; Full time

Job summary

ALL KNOWN SERVICES is seeking a founding backend engineer (0–7 years) to own projects end-to-end in a fast-moving early-stage environment. You'll design APIs, build backend infrastructure, and help shape the core systems that power AI agents in the real world.

The role is on-site in San Francisco with potential visa-friendly setup. Expect heavy emphasis on REST APIs, system design, scalable server-side architecture, and shipping features from 0→1 while collaborating across disciplines.

Qualifications

• Strong proficiency in TypeScript or modern frameworks.
• Experience at a FAANG or well-known VC-backed startup (Series A+).
• Deep back end fundamentals: REST API design, system design, server-side architecture.

Responsibilities

• Build and design APIs and backend infrastructure used by AI agents.
• Own 0→1 projects from scoping to production rollout.
• Work across the full stack (~80% backend, ~20% frontend).
• Proactively pitch ideas and contribute to product and growth thinking.
• Be a front line contact for customer feedback and enterprise deployments.
• Write clear, maintainable code and documentation while handling high email throughput.

Skills

TypeScript

REST API design

System design

Server-side architecture

Shipping features 0→1

Strong communicator

Education

CS or technical degree

Job description

Type: Full-Time, Direct Hire

Experience: 0-7 years

Visa: Open to visa transfers (OPT and H-1B transfers)

Role:

We're looking for a backend-leaning Founding Engineer (0–7 years experience) who has shipped production software at a pedigreed company — FAANG, high-growth VC- backed startups (Series A+), or equivalent. You'll own projects end-to‑e‑end in a fast‑moving, early‑stage environment and help shape the core infrastructure that AI agents use to communicate and operate in the real world.

What You'll Do

• Build and design APIs and backend infrastructure that AI agents use to communicate, authenticate, and operate
• Own 0→1 projects end-to‑e‑end — from scoping customer requirements through system design to production rollout (e.g., IMAP integration, usage‑based pricing systems)
• Work across the full stack (~80% backend, ~20% frontend/other), touching distributed systems, databases, and developer tooling
• Proactively pitch ideas — you're expected to bring product and growth thinking, not just execute tickets
• Be a front line point of contact for customer feedback and support enterprise deployments
• Write clear, maintainable code and documentation while processing hundreds of thousands of emails per day

What We're Looking For

• Strong proficiency in Type Script or modern equivalent frameworks
• Experience at a FAANG or well‑known VC‑backed startup (Series A+)
• Deep back end fundamentals: REST API design, system design, server‑side architecture
• Track record of shipping and owning features from 0→1 in production with real users
• CS or technical degree from a top engineering school (especially for new grads)
• High agency — you bring ideas and drive execution without needing scope handed to you
• Strong communicator of trade offs, blockers, and technical decisions
• Must be based in or willing to relocate to San Francisco (on‑site 5 days/week)

Bonus Points

• Experience with email, messaging, or protocol‑heavy systems (SMTP, IMAP, OAuth)
• Exposure to cloud infrastructure, distributed systems, or developer tooling — especially in AI/LLM or agent workflows
• Prior founding, fellowship, or 0-to-1 building experience
• Evidence of doing hard things outside of engineering — competitive athletics, self‑directed projects, anything showing grit and agency