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Lead Software Data Performance Engineer

  • Boston, MA
  • Engineering

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 to see how we empower creators to own their own destiny.

Klaviyo is growing fast and we have openings for all skill levels across all of our teams. Learn more about our engineering culture at

We love tackling tough engineering problems and look for Engineers who specialize in certain areas but are passionate about building, owning & scaling features end to end from scratch and breaking through any obstacle or technical challenge in their way. We push each other to move out of our comfort zone, learn new technologies and work hard to ensure each day is better than the last.

Klaviyo operates a real-time data platform built for massive scale on Amazon Web Services (AWS). Engineers come to Klaviyo with experience in a variety of languages and from a number of disciplines.

Team Overview:

The data platform team facilitates the storage and interactions with billions of data points per day.  These data points power core, Klaviyo functionality and are leveraged by internal application teams to generate data-driven insights for our customers.


This team manages the foundation of Klaviyo analytics.  You will have ownership over defining the evolutionary, technical vision of analytical data management at Klaviyo. As a lead engineer on this team, you will be responsible for coaching engineers, managing/reviewing technical documentation and articulating a phased approach to achieving the team's overall technical vision.

Team Tech Stack: Hudi, Clickhouse, MySQL, EMR, Airflow, Parquet, Kubernetes, Terraform, Spark, Kafka, Python

Required Skills:

  • Bachelor's degree or equivalent practical experience
  • 8 years of experience in software development, and strong knowledge of computer science fundamentals
  • 5 years of experience testing, developing, and launching software products, and 3 years of experience with software design and architecture
  • Hands-on experience designing reliable, fault-tolerant, and high performance distributed systems
  • Proven ability to come up to speed quickly 
  • Experience applying multi-dimensional data models to analytical data for optimal storage and retrieval
    • Star Schema
    • Snowflake Schema
    • Data Vault
  • Knowledge of data algorithms and database internals. Examples include:
    • Building stream/batch processing applications
    • Understanding of search, range or probabilistic indices
    • Knowledge of B / LSM Trees
  • 2+ years of professional experience using:
    • Hudi or Delta Lake
    • Clickhouse, Druid, Pinot or similar.
    • Cloud-based DFS (eg. AWS S3, Google Storage Buckets, Azure Blob Storage)

Preferred Skills:

  • 3 years of experience in an architectural role leading project teams and setting technical vision
  • 3 years of experience working in an organization involving cross-functional teams
  • 2+ years of experience applying multi-dimensional data modeling for optimal storage and retrieval
    • Star Schema
    • Snowflake Schema
    • Data Vault
  • 4+ years of experience designing systems leveraging:
    • Hudi or Delta Lake
    • Clickhouse, Druid, Pinot or similar.
    • Cloud-based DFS (eg. AWS S3, Google Storage Buckets, Azure Blob Storage)

The pay range for this role is listed below. Sales roles are also eligible for variable compensation and hourly non-exempt roles are eligible for overtime in accordance with applicable law. This role is eligible for benefits, including: medical, dental and vision coverage, health savings accounts, flexible spending accounts, 401(k), flexible paid time off and company-paid holidays and a culture of learning that includes a learning allowance and access to a professional coaching service for all employees.

Pay Range For US Locations:
$192,000—$288,000 USD

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.

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 (, instant messaging platforms, or unsolicited calls. 

You can find our Job Applicant Privacy Notice here .

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