Software Engineer, Infrastructure

ABOUT BLOCKIT Time is the most valuable resource we have, yet coordinating it remains stuck in the dark ages. At Blockit, we're building the AI that finally fixes this: an autonomous time agent that handles the full complexity of scheduling—timezones, group coordination, in-person logistics—like an executive assistant that never sleeps. While every LLM application to date has been a one-on-one conversation, Blockit is one of the first multiplayer, stateful AI agents—coordinating between multiple people, maintaining context across conversations, and taking real actions in the world. As more people connect their calendars, our network becomes exponentially more powerful. This is the foundation of a platform of AI agents with access to the world's time. We're backed by Sequoia, and we're a small, sharp team that moves fast, ships constantly, and holds a high bar. If you want to build something genuinely new, we'd love to talk. You can visit our teams page https://www.notion.so/Meet-Blockit-Engineering-292f9049a24f803cb56dc84d4ece8730?pvs=21 to learn more about our team and culture. THE ROLE Think of this as a product engineer role — but the product is everything underneath. For a stateful, multiplayer AI agent that takes real actions in the world, infrastructure is the user experience. When a meeting gets scheduled in 800ms instead of 4 seconds, when an email never gets dropped, when our agent recovers gracefully from a flaky third-party API — that's a feature users feel. You'll ship those features. This role spans three connected areas: - Infra that users feel — own our core systems (PostgreSQL, ClickHouse, async job processing, LLM gateway, email infra) with the same product instincts an engineer would bring to a customer-facing feature. Latency, reliability, and recovery are user-facing metrics, and you'll move them. We've outgrown some of our early choices and will outgrow more, so you'll also lead the build-vs-buy and migration calls: is pg-boss still the right qu