Software Engineer, AI Agents at Blockit (Sequoia-Backed AI Scheduling Agent), San Francisco

About The Job

Blockit is hiring for this role in San Francisco, and Harper, an AI career agent, is on your side of the table. Skip the application form: just talk to Harper, and in a few minutes it learns your background, then puts the strongest profiles directly in front of Blockit's founders. 👉 Start with Harper

Job Title

Software Engineer, AI Agents at Blockit, San Francisco

Level

2+ years shipping and owning production software. Strong backend engineer; LLMs in production is a plus, not a requirement.

Salary

Competitive salary + equity at a Sequoia-backed company.

Location

San Francisco, CA.

On-site 4 days per week.

Full-time.

Company Description

Blockit is a Sequoia-backed AI scheduling agent: CC it on any email or Slack thread and it negotiates the times, handles the time zones, and sends the invite.

Customers include teams at Andreessen Horowitz, Index Ventures, Accel, Thrive Capital, Ramp, Vanta, Clay, and Granola.

Founded by a former Sequoia partner and covered by TechCrunch and Sequoia in January 2026.

While every LLM application to date has been a one-on-one conversation, Blockit is one of the first multiplayer, stateful AI agents: it coordinates between multiple people, keeps context across conversations, and takes real actions in the world.

The Role

You own the intelligence at the core of Blockit: the scheduling agents that autonomously coordinate meetings across people, time zones, and constraints.

Design and iterate on agent architectures, write and refine prompts, build evaluation frameworks, and ship new capabilities as models improve, across the orchestrator agents that manage conversation flow and the specialized sub-agents.

These are real-world AI agents used in production by thousands of people.

What You'll Do

• Write and refine prompts across the agent system: orchestrators, sub-agents, and tools
• Build and maintain evals to measure agent quality and catch regressions
• Debug agent failures: figure out why it misunderstood a request or made a bad call
• Implement new agent capabilities as user needs expand
• Experiment with new architectures and techniques as models improve
• Instrument and analyze agent behavior to find patterns and failure modes

Who You Are

• 2+ years of experience shipping and owning production software
• Strong backend engineering skills, with the ability to work across the stack when needed
• Experience working with LLMs in production systems, or a demonstrated ability to learn quickly in this space
• Deep curiosity about agent architectures and how the industry is evolving beyond simple prompt-based systems
• Clear, structured communicator who can explain what's working, what isn't, and why

Why Join

• Own the core of a production AI agent that already schedules for teams at a16z, Index, Ramp, and Vanta
• Tiny, senior team backed by Sequoia; every customer so far came inbound
• Work in person in San Francisco with people who ship daily

How This Works

Harper is an AI career agent on your side, free for candidates and paid by companies.

• Talk to Harper for 5 minutes. No resume form.
• If you're a fit, your profile goes straight to Blockit's hiring team, and only after you approve.
• Not a fit? Harper keeps sending you roles you wouldn't find on your own.