Senior Backend & Platform Architect — Hybrid (AI Startup)

Seer; San Francisco (CA); Hybrid; USD 180,000 - 240,000; Full time

Job summary

Seer in San Francisco is seeking a Senior/Staff Backend & Platform Engineer to help define core infrastructure at an early-stage AI startup, with ownership over platform design and data systems. You will join as one of the senior engineers and shape the architecture, APIs, and data infra across scalable backend and data platforms.

The role emphasizes hands-on work, fast iteration, and a direct impact on product reliability, scale, and future direction in a hybrid SF Bay Area setting.

Qualifications

• 3+ years building backend and data-platform systems at scale.
• Led a data or ML platform with architecture ownership and long-term direction.
• Deep data-infrastructure chops: data architecture, storage and execution engines, lakehouse-style migrations.
• Strong in Python and cloud infra; fluent with databases, data modelling and API design.
• Bonus: hands‑on with LLMs, agentic frameworks or RAG.

Responsibilities

• Design, build and ship scalable backend and platform systems from the ground up
• Build the data and agent infrastructure that lets LLMs reason over large, messy, real-world datasets
• Own the architecture
• Move fast in an early-stage environment where you're trusted to make the calls

Skills

Python

Cloud Infra

Data Platform

Data Modeling

API Design

LLMs / RAG

Architecture Ownership

Back-end Engineering

Job description

Seer in San Francisco is seeking a Senior/Staff Backend & Platform Engineer to help define core infrastructure at an early-stage AI startup, with ownership over platform design and data systems. You will join as one of the senior engineers and shape the architecture, APIs, and data infra across scalable backend and data platforms.

The role emphasizes hands-on work, fast iteration, and a direct impact on product reliability, scale, and future direction in a hybrid SF Bay Area setting.