Principal Engineer, Enterprise Scalability

The role

You will own Klaviyo's approach to enterprise scalability, performance, reliability, and multi-region readiness. You will identify bottlenecks, drive architectural changes, and establish readiness measures for large workloads.

What you will do

• Define scale readiness and establish measurable targets for latency, throughput, error rates, and capacity.
• Identify and remove bottlenecks using production data, profiling, and benchmarks.
• Design and implement sharding, partitioning, caching, back-pressure, and workload isolation strategies.
• Advance multi-region readiness and build paths for high-volume data migrations.
• Create lightweight benchmarks, profiling harnesses, and test environments.
• Lead scalability reviews and establish release gates.
• Lead technical deep dives to identify systemic causes of incidents.
• Apply AI to improve investigation and response through profiling, modeling, and anomaly detection.
• Communicate technical priorities and tradeoffs to engineers and executives.

Required qualifications

• 12+ years of relevant engineering experience scaling multi-tenant SaaS.
• Hands-on experience with performance engineering, capacity planning, sharding and partitioning, caching, back-pressure, tenant isolation, multi-region architectures, and large-scale migrations.
• Ability to investigate unfamiliar systems, test hypotheses, and write production code.
• Ability to align teams around shared outcomes and build practical standards.
• Ability to explain complex technical decisions to engineering and executive audiences.
• Applied experience using AI tools or automation to engineering work.

Benefits

• Annual cash bonus plan
• Equity
• Sign-on payments
• Health, welfare, and wellbeing benefits

Before you apply

• By participating in the interview process, you acknowledge you will adhere to Guidelines for using AI in the Klaviyo interview Process.
• We use Covey as part of our hiring and / or promotional process.

About the company

Klaviyo empowers creators to own their destiny by making first-party data accessible and actionable. They help businesses build stronger relationships with their customers.