Principal Engineer, Enterprise Scalability

🔥 0 minutes ago

🍂 Massachusetts – Remote

🍂 Massachusetts – Remote

💵 $244k - $366k / year

⏰ Full Time

🔴 Lead

🧑‍💻 Full-stack Engineer

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Klaviyo

WebsiteLinkedInAll Job Openings

1001 - 5000 employees

Founded 2012

📣 Marketing

🛍️ eCommerce

☁️ SaaS

💰 Secondary Market on 2022-09

Marketing • eCommerce • SaaS

Klaviyo is a leading marketing automation platform that enables businesses to build stronger digital relationships with their customers through a unified data-first approach. It offers tools such as email marketing, SMS marketing, mobile push notifications, and customer data platforms to create personalized customer experiences. Klaviyo integrates seamlessly with over 350 pre-built software platforms, allowing businesses to connect their entire tech stack easily. With a focus on predictive analytics, AI-driven insights, and comprehensive customer data profiles, Klaviyo empowers brands to enhance engagement, increase sales, and grow sustainably. It serves a global clientele of over 157,000 brands across 80+ countries, supporting their efforts in ecommerce and digital marketing strategies.

📋 Description

• Own Klaviyo’s approach to enterprise scalability, performance, reliability, and multi-region readiness • Identify and remove major bottlenecks using production data, profiling, and reproducible benchmarks • Establish measurable targets for latency, throughput, error rates, and capacity • Build a shared scale-readiness scorecard and align teams on service-level objectives, error budgets, and performance expectations • Design and implement sharding, partitioning, caching, back-pressure, workload isolation, and multi-region strategies • Build safe paths for high-volume data migrations • Create benchmarks, profiling harnesses, and test environments for independent team use • Lead scalability reviews and establish release gates • Lead technical incident deep dives, identify systemic causes, and deliver lasting fixes • Apply AI-assisted profiling, workload modeling, synthetic traffic, anomaly detection, and guided runbooks with guardrails • Communicate priorities, tradeoffs, and results to engineers and executives • Report to the VP of Engineering as a senior individual contributor with no direct reports

🎯 Requirements

• 12+ years of relevant engineering experience • Deep experience scaling multi-tenant SaaS • Track record of removing significant bottlenecks and demonstrating measurable production impact • 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, write production code, and roll out changes safely • Sound technical judgment to evaluate architectural tradeoffs • Ability to align teams around shared outcomes, clarify ownership, and establish practical standards • Ability to explain complex technical decisions and business implications to engineering and executive audiences • Applied AI tools or automation experience in engineering work • Ability to evaluate AI usefulness, limitations, and operational risks • Responsible AI fluency, including privacy, security, bias awareness, and human-in-the-loop practices

🏖️ Benefits

• Annual cash bonus plan may be included • Equity may be included • Sign-on payments may be included • Comprehensive health, welfare, and wellbeing benefits based on eligibility • Up to 10% travel, coordinated in advance • Generous benefits • Accommodations as needed

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