Staff Engineer owning Coinbase's company-wide LLM Gateway and agent runtime platform

Coinbase is hiring a Staff Software Engineer for its AI Platform team to own the architecture of the company's single path to LLMs — the LLM Gateway (60+ models), agent runtime with microVM sandboxes and governed MCP gateway, Knowledge Base infrastructure, and AI FinOps spend governance. This is a multi-quarter, org-wide platform ownership role requiring deep LLM/agent infrastructure expertise plus Python and a systems language.

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What this interview tests

LLM gateway architecture: multi-model routing, auth, PII redaction, fallbacks, cost optimization
Agent runtime infrastructure: microVM sandboxing, governed MCP gateway
Knowledge base / vector database infrastructure design
AI FinOps: spend attribution and cost governance across AI workloads
Evaluation and observability: LLM-as-judge, tracing, feedback loops
Leading multi-quarter, Staff-level initiatives cross-functionally with security/legal/finance

Common question themes

Design an LLM gateway that routes across 60+ models with fallback and cost controls

How would you build a governed MCP gateway for agent tool access with security in the loop

Tell me about leading a multi-quarter platform initiative end-to-end

How do you approach cost attribution/FinOps for shared AI infrastructure

Describe an LLM-as-judge or agent evaluation system you've built

How have you partnered with security/legal teams to ship a production-grade AI system

How candidates describe it

Real Staff Software Engineer interview stories — retold from candidates' public write-ups, with sources.

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Interviewed July 2018 · Sunnyvale, CA

Google · L3 Software EngineerOffer

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A candidate with two years of experience went from recruiter outreach to offer over about four months. The onsite was four 45-minute coding rounds — three of them featuring binary trees — and one round turned into a 25-minute chain of follow-ups about approximating an optimal solution at scale.

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Google · L4 Software EngineerNo offer

Google L4 Software Engineer Interview: Eight Rounds, No Offer

An L4 Software Engineer candidate went through two phone screens, three onsite rounds, a culture conversation, and a team-matching call with a Google hiring manager, then watched the process stall for about a month and a half over a tightened experience requirement before an added extended round ended without an offer.

Interviewed February 2024 · Not specified

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