Senior / Staff Engineer - Platform

Platform Engineering

We're building Sei into a world-class L1 for decentralized finance. This role exists to make the safe path the default path for every engineer on the team — observable, tested, reversible, and fast. You'll be a foundational hire on a small Platform Engineering team with a broad mandate.

What you'll own

• Infrastructure & scale testing: Build and maintain Docker/Kubernetes harnesses for repeatable stress and scale testing, used by every core team as a pre-release gate.
• Release engineering & CI/CD: Consolidate CI/CD into reusable, standardized workflows. Own version tagging, hotfix paths, PR review scaffolding, and the full release lifecycle.
• Observability: Single pane of glass for metrics, traces, and logs — correlated by block height, powered by OpenTelemetry. HA Prometheus, ELK, defined SLOs on every critical service.
• Performance & chaos testing in CI: Automated chaos and performance tests gating 100% of releases. Regressions caught before merge, not by users.
• Security & incident response: Run the bug and vulnerability workflow end to end — auditors, Immunefi, triage, postmortems. Every incident produces a new test, metric, or runbook.

What we're looking for

• 5+ years building production systems at scale. You've designed and shipped infrastructure that other engineers rely on, and you understand it end to end — not just the surface API.
• Security fundamentals: Threat modeling, common vulnerability classes, and how security work integrates into a development pipeline. You don't treat audits as a checkbox.
• Distributed consensus understanding: You can reason about consensus protocols at the algorithmic level — safety vs. liveness, fault assumptions, the failure modes that show up in practice. You've debugged something non-trivial at this layer or studied it deeply enough to.
• Benchmarking & performance bottleneck analysis: You design benchmarks that isolate variables. You profile under realistic load. You can walk into an unfamiliar system, find the bottleneck, and explain why it's the bottleneck before proposing a fix.
• Live incident response: You've operated systems where outages had real consequences. You triage under pressure, communicate clearly, and turn postmortems into structural fixes that don't quietly expire.
• End-to-end systems thinking: You've built systems, not just glued tools together. You have opinions on monitoring stacks, what belongs in CI vs. CD vs. runtime, and when to reach for chaos testing — and you can defend them.

Bonus

• Blockchain or web3 infrastructure experience, especially with consensus, mempool, or storage layers.
• Multi-cloud cost programs that didn't compromise reliability.
• Experience integrating AI-assisted security tooling into a development pipeline.