Principal Engineer, Enterprise Scale & Performance

Klaviyo

Boston (MA)

On-site

USD 244,000 - 366,000

Full time

3 days ago

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Job summary

Klaviyo seeks a senior technical IC to own scalability, performance, reliability, and multi-region readiness. Reporting to a VP of Engineering, you will contribute hands-on engineering with no direct reports, guiding architectural decisions and partnering across teams to deliver high-impact improvements for our largest tenants.

You will tackle bottlenecks, drive platform-wide changes, and help teams adopt practical patterns for repeatable success.

Qualifications

12+ years of relevant engineering experience with demonstrable production impact.
Strong performance and distributed systems expertise across multi-tenant SaaS.
Engineering depth from diagnosis through delivery with measurable outcomes.
Clear technical judgment and ability to balance immediate constraints with platform changes.
Leadership across organizational boundaries and clear cross-team alignment.
Effective communication to engineers and executives, with AI tooling experience.

Responsibilities

Define scale readiness targets, latency and throughput goals, and service SLAs.
Identify bottlenecks using production data and benchmarks; drive fixes.
Lead architectural changes for multi-region readiness and high-volume migrations.
Create repeatable benchmarks and patterns for teams to adopt.
Integrate readiness into delivery with release gates and risk awareness.
Conduct deep dives on incidents and drive lasting improvements.
Apply AI-enabled profiling and anomaly detection to optimize operations.
Communicate priorities and results to engineers and executives.