Senior / Staff Engineer - Platform

Sei Labs•New York, NY

About The Position

Sei Labs builds open sourced technology for the high-performance Sei Blockchain, the first parallelized EVM Layer 1 blockchain designed to scale with the industry. The unique optimizations built into Sei enable Web3 applications to reach Web2 level scale and performance, driving the mass adoption of digital assets. Our teams are comprised of former Google, Goldman Sachs, Robinhood, Nvidia, and Databricks veterans dedicated to onboarding the next billion users onto a vibrant ecosystem of applications. Sei Labs has raised over $30M from top investors including Jump Crypto, Multicoin Capital, Coinbase Ventures, Distributed Global, Hudson River Trading, and Flow Traders. Platform Engineering at Sei 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.

Requirements

5+ years building production systems at scale.
Designed and shipped infrastructure that other engineers rely on, and 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.
Distributed consensus understanding: Ability to reason about consensus protocols at the algorithmic level — safety vs. liveness, fault assumptions, the failure modes that show up in practice. Experience debugging at this layer or studying it deeply.
Benchmarking & performance bottleneck analysis: Design benchmarks that isolate variables, profile under realistic load, find bottlenecks in unfamiliar systems, and explain them before proposing fixes.
Live incident response experience: Operated systems where outages had real consequences. Ability to triage under pressure, communicate clearly, and turn postmortems into structural fixes.
End-to-end systems thinking: Built systems, not just glued tools together. Have opinions on monitoring stacks, what belongs in CI vs. CD vs. runtime, and when to reach for chaos testing — and be able to defend them.

Nice To Haves

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

Responsibilities

Build and maintain Docker/Kubernetes harnesses for repeatable stress and scale testing, used by every core team as a pre-release gate.
Run our multi-cloud footprint with explicit reliability and cost targets.
Consolidate CI/CD into reusable, standardized workflows.
Own version tagging, hotfix paths, PR review scaffolding, and the full release lifecycle.
Implement a single pane of glass for metrics, traces, and logs — correlated by block height, powered by OpenTelemetry.
Set up HA Prometheus, ELK, and defined SLOs on every critical service.
Implement automated chaos and performance tests gating 100% of releases.
Run the bug and vulnerability workflow end to end — auditors, Immunefi, triage, postmortems.
Ensure every incident produces a new test, metric, or runbook.

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