---
title: 'Principal Engineer, Enterprise Scalability (Remote - East Coast Only) at Klaviyo'
canonical: 'https://feeny.ai/job/principal-engineer-enterprise-scalability-remote-east-coast-only-klaviyo-boston-y8fsw85f38ce'
type: 'job'
last_seen: '2026-11-05'
---

# Principal Engineer, Enterprise Scalability (Remote - East Coast Only) at Klaviyo

- **Company:** Klaviyo
- **Location:** Boston, MA
- **Compensation:** $244k–$366k
- **Posted:** 2026-11-03
- **Last confirmed live:** 2026-11-05
- **Apply:** https://www.klaviyo.com/careers/jobs/8179354003?gh_jid=8179354003

## Job description

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit [klaviyo.com/careers](http://klaviyo.com/careers) to see how we empower creators to own their own destiny.

At Klaviyo, we help businesses build stronger relationships with their customers. As our customers grow, our platform needs to support greater data volumes, more demanding workloads, and increasingly complex operations—with the performance and reliability they depend on.

Engineering at this scale takes technical depth, sound judgment, and close collaboration. You’ll work across teams to solve challenging problems, turn architectural improvements into production results, and help build a platform ready for our largest customers.

## Your Impact

We are seeking a senior technical leader to own Klaviyo’s approach to enterprise scalability, performance, reliability, and multi-region readiness. Reporting to a VP of Engineering, you will be a senior individual contributor with no direct reports. You will lead through technical expertise, hands-on engineering, and influence, partnering across teams to deliver improvements that matter to our customers.

You will identify and remove major bottlenecks, drive platform-wide architectural changes, and establish clear measures of readiness for our largest tenants and most demanding workloads. Your work will span system design, profiling, implementation, and production rollout. You will also help teams adopt practical tools and repeatable patterns that make performance and reliability part of everyday engineering.

This role suits an experienced engineer who can move between deep technical investigation and clear executive communication, make and defend architectural decisions, and build alignment across teams.

Reports to: VP of Engineering Direct reports: None

Location: Remote (Only applicable to candidates outside of MA. Requires travel to Boston HQ at least once per quarter)

## What You’ll Do

- Define what scale readiness means. Establish measurable targets for latency, throughput, error rates, and capacity. Build a shared scorecard and align teams on service-level objectives, error budgets, and performance expectations for critical enterprise workloads.

- Remove the bottlenecks that matter most. Use production data, profiling, and reproducible benchmarks to identify constraints. Partner with service owners to implement fixes and verify improvements under representative workloads.

- Drive architectural change. Design and implement sharding, partitioning, caching, back-pressure, and workload isolation strategies. Advance multi-region readiness and build safe paths for high-volume data migrations.

- Make scale engineering repeatable. Create lightweight benchmarks, profiling harnesses, and test environments that teams can use independently. Pair with engineers to turn successful fixes into reusable patterns.

- Build readiness into delivery. Lead scalability reviews and establish clear, proportionate release gates that surface risks early and help teams ship confidently.

- Turn incidents into lasting improvements. Lead technical deep dives, identify systemic causes, and work with teams to deliver and validate fixes that reduce recurring incidents.

- Apply AI where it improves outcomes. Use AI-assisted profiling, workload modeling, synthetic traffic, anomaly detection, and guided runbooks to improve investigation and response. Establish explicit guardrails, evaluate results, and measure operational impact.

- Connect engineering decisions to customer needs. Communicate priorities, tradeoffs, and results clearly to engineers and executives, tying technical investments to customer experience, enterprise growth, and operating efficiency.

## What You’ll Bring

- Deep experience scaling multi-tenant SaaS. You bring 12+ years of relevant engineering experience, with a track record of removing significant bottlenecks and demonstrating measurable production impact.

- Strong performance and distributed systems expertise. You have hands-on experience with performance engineering, capacity planning, sharding and partitioning, caching, back-pressure, tenant isolation, multi-region architectures, and large-scale migrations.

- Engineering depth from diagnosis through delivery. You can investigate unfamiliar systems, test hypotheses, write production code, and work with service owners to roll out changes safely.

- Sound technical judgment. You use evidence to weigh architectural tradeoffs and know when to address an immediate constraint versus invest in a broader platform change.

- Leadership across organizational boundaries. You align teams around shared outcomes, clarify ownership, and build practical standards that help engineers move faster.

- Clear communication. You explain complex technical decisions and their business implications to both engineering and executive audiences.

- Practical AI fluency. You have applied AI tools or automation to engineering work and can evaluate their usefulness, limitations, and operational risks. You are curious about new approaches and disciplined about validating them.

What Success Looks Like in 6–12 Months

- A company-wide scale scorecard is adopted and reviewed regularly, with agreed targets and clear ownership for critical enterprise workloads.

- Two to three high-impact bottlenecks are removed, with reproducible benchmarks demonstrating sustained improvements.

- Our largest customer workloads show measurable improvements in tail latency, throughput, and error rates.

- Multi-region readiness and high-volume migration plans have clear priorities, tested assumptions, and actionable next steps.

- Teams use shared benchmarks and readiness checks to catch regressions earlier, and repeat P0 incidents decline.

- AI-assisted tools demonstrate measurable value in investigation or incident response, such as faster regression isolation or fewer noisy alerts, with appropriate controls and observability.

We use Covey as part of our hiring and / or promotional process. For jobs or candidates in NYC, certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using [Covey Scout for Inbound](https://getcovey.com/product/covey-scout-inbound) on April 3, 2025.

Please see the independent bias audit report covering our use of Covey [here](https://getcovey.com/nyc-local-law-144).

Massachusetts Applicants: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.

Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location.

In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility.

Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process.

Base Pay Range For US Locations: $244,000—$366,000 USD

This role may require up to 10% travel for purposes such as new hire onboarding, client or partner work if applicable, team meetings, and industry events. Travel is coordinated in advance.

Get to Know Klaviyo

We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us.

AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed.

By participating in Klaviyo’s interview process, you acknowledge that you have read, understood, and will adhere to our [Guidelines for using AI in the Klaviyo interview Process](https://www.klaviyo.com/careers/ai-guidance). For more information about how we process your personal data, see our [Job Applicant Privacy Notice](https://www.klaviyo.com/legal/job-applicant-privacy-notice).

Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law.

IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls.

By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice.  If you do not wish for Klaviyo to process your Personal Data, please do not submit an application.  You can find our Job Applicant Privacy Notice [here](https://www.klaviyo.com/legal/job-applicant-privacy-notice) and [here](https://www.klaviyo.com/fr/legal/job-applicant-privacy-notice) (FR).

## About Klaviyo

## Company Overview
- **One-liner**: Klaviyo is an AI-first B2C CRM platform that unifies customer data, marketing automation, and analytics to help brands create personalized, revenue-driving customer experiences.
- **Entity Type**: Public (NYSE: KVYO)
- **Headquarters**: Boston, Massachusetts, USA (Global headquarters; also offices in San Francisco, Denver, London, Dublin, Sydney, Singapore, Paris)
- **Founded**: 2012
- **Founders**: Andrew Bialecki and Ed Hallen

## Core Business
- **Primary industry**: Marketing technology / Customer Data Platform / B2C CRM
- **Target customers**: B2C brands (e.g., ecommerce, retail, consumer goods) – from SMB to enterprise; 193,000+ paying customers in 80+ countries
- **Mission or purpose**: “Empower creators and brands to own their growth” – built to solve the customer data problem and strengthen customer relationships.

## Products & Services
- **Klaviyo B2C CRM**: Unified platform combining customer data platform (CDP), marketing automation, analytics, and customer service into a single AI-first system.
- **Email Marketing**: Core channel for personalized, automated email campaigns.
- **SMS / RCS / WhatsApp / Mobile Push**: Omnichannel messaging with real-time triggers.
- **Klaviyo CDP**: Built-in customer data platform that unifies profiles from 350+ native integrations.
- **Reviews**: Product review and social proof functionality (launched 2023).
- **Marketing Attribution & Analytics**: Optimization and attribution tools (launched 2018).
- **Developer Tools**: APIs, webhooks, SDKs, warehouse syncs, and AI agent integrations (ChatGPT, Claude, MCP).

## Market Standing
- **Valuation/Market Cap**: Public company; latest market cap available from NYSE trading data (not provided in search results).
- **Key Metric**: Public company – refer to latest SEC filings (10-K/10-Q) for revenue and profitability. Private metrics: 193,000+ customers, 2,000+ employees, 7+ billion daily events processed.
- **Notable Investors/Partners**: Co-CEOs Andrew Bialecki and Chano Fernandez; strategic investors include Summit Partners and others (prior to IPO). Key integrations with Shopify, Salesforce, Meta, and 350+ other platforms.
- **Growth Signals**: Appointed Chano Fernández as co-CEO (January 2026); launched unified B2C CRM in 2025; 2,000+ employees worldwide; expanding into new channels (RCS, WhatsApp); strong AI-first positioning.

## Competitive Advantages
- **Data-first architecture**: Built on a flexible customer data platform that unifies data, analytics, and execution – no need for separate CDP or middleware.
- **AI-native**: AI is embedded in the product (AI agents, automated insights, one-click execution) and in the company culture (“AI is in our DNA”).
- **Scale and reliability**: Processes 7+ billion daily events; enterprise-grade security, uptime SLAs, and peak-season support (e.g., Black Friday/Cyber Monday).
- **Integration ecosystem**: 350+ pre-built integrations with major ecommerce, payment, CRM, and analytics tools.
- **Developer-friendly**: Full APIs, webhooks, SDKs, and agentic workflow connectors (MCP, Claude, ChatGPT).

## Strategic Focus
- **Unified B2C CRM**: Consolidating fragmented legacy stacks (CDP, marketing automation, service) into one platform.
- **AI-first product development**: Leveraging AI agents and machine learning to automate personalization and campaign execution.
- **International expansion**: Offices in Europe, Asia-Pacific, and Middle East (Singapore, Paris, Sydney).
- **Enterprise growth**: Targeting large brands with dedicated CSMs, compliance, and advanced security.
- **Talent and culture**: Hiring for “ambitious people” with emphasis on ownership, feedback, and meaningful challenges.

## Why Work Here
- **Culture**: Values-driven with a focus on “put customers first”, “stay hungry, stay humble”, “move fast, no shortcuts”, and “win together”. High agency and autonomy expected.
- **Hybrid/Remote**: Hybrid workspace model (offices in Boston, San Francisco, Denver, London, Dublin, Sydney, Singapore, Paris). Flexible PTO, company-wide Recharge Days, and a fully paid sabbatical every five years.
- **Benefits**: Comprehensive health and wellness, financial benefits (retirement support, stock discounts), family care (parental leave), learning stipends, and mentorship.
- **Engineering culture**: “Be meticulous in your craft” – solving complex problems at scale, AI and ML teams shaping the future of customer connections. Strong emphasis on continuous learning and growth.
- **Diversity and inclusion**: Intentionally woven into team building, customer service, and product creation.

## Sources
1. [klaviyo.com/careers](https://www.klaviyo.com/careers)
2. [klaviyo.com/about](https://www.klaviyo.com/about)
3. [klaviyo.com](https://www.klaviyo.com/)
4. [indeed.com/cmp/Klaviyo/about](https://www.indeed.com/cmp/Klaviyo/about)
5. [builtin.com/company/klaviyo](https://builtin.com/company/klaviyo)

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