Senior Backend Engineer

The Platform team is the engine room of Antithesis — we own the infrastructure, services, and tools that are at the core of the product. As a Senior Backend Engineer here, you won't be maintaining someone else's abstractions. You'll be designing them from scratch, owning them end-to-end, across the full stack: from raw binary formats and block compaction all the way up to the external APIs our customers depend on. Correctness and performance aren't nice-to-haves here — they're the job.

If you get unreasonably excited about systems design, performance, storage efficiency, clean API contracts, and finding the bottleneck nobody else noticed, we'd love to talk.