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Senior / Staff Backend & AI Engineer

Tofu

Tofu

Software Engineering, Data Science
San Francisco, CA, USA
Posted on Aug 25, 2025

At Tofu (tofuhq.com), we’re building the future of B2B marketing with AI. Our platform helps companies create hyper-personalized, omni-channel content at scale — and we’re growing fast. Backed by Index Ventures, SignalFire, and HubSpot Ventures, we are post Series A and are scaling the team.

👉 See Product Demo: https://www.loom.com/share/4845885881264dea914a9978d57a238e

What you’ll do:

  • Build scalable backend systems with Python/AWS
  • Apply LLMs + modern AI frameworks (LangChain, LangGraph) to real-world problems
  • Design distributed systems for enterprise workloads
  • Optimize Postgres + REST APIs
  • Ship features daily, working directly with customers

What we’re looking for:

  • 3+ years of experience (mix of big tech + startup = ideal)
  • Strong in Python, AWS, scalable systems, databases, APIs
  • Experience with LLMs/AI frameworks
  • Product-minded engineer who loves end-to-end problem solving

Why join us?

  • High-impact role shaping the future of generative marketing tech
  • Talented, collaborative team in a fast-growing startup
  • Dog-friendly San Mateo office (3 days/week)
  • Daily product releases — ship fast, learn fast
  • 📩 Interested? Apply directly or reach out: honglei@tofuhq.com