• In this role, you will own and build features/services that hundreds of thousands of Klaviyo customers rely on daily to drive their business forward.
• Work on crafting our highly-scalable, highly-available campaign pipeline that processes and delivers hundreds of millions of messages daily growing to billions scale.
• Collaborate radically with teams and stakeholders across Klaviyo on designs, implementations, and engineering practices.
• Learn new technologies, bring them to the team and apply them to evolve our systems to the next level.
• Help us improve our experimentation and development processes, and mentor other engineers on the team.
• Participate in the technical interview process to help maintain a high bar for our growing teams
• Contribute to the company as a subject matter expert, constantly pushing yourself to be a better engineer and to level up all of your peers within your team and within Klaviyo.

Who You Are 

• 5+ years of professional software engineering experience building and operating production distributed systems.
• Deep fluency in at least one backend language (Python, Go, Java, Scala, or similar) and comfort navigating large, complex codebases.
• Experience on large-scale system architecture, technologies and patterns. Have a good understanding of their pros/cons and use scenarios, able to apply them to system design by making appropriate tradeoffs to meet the business needs best.
• Love digging into performance and scalability issues to drive breakthrough solutions-- whether it's a performance degradation or too many clicks in a workflow, a database query timing out, or a queue that just won’t drain. You recognize all problems can be solved.
• Passionate about growing and improving a product daily using a data driven mindset, familiar with system monitoring and alerting techniques.
• Proven experience with being a coach and a mentor for team members and helping them grow.
• Solid understanding of distributed systems fundamentals: consistency models, CAP, tradeoffs, idempotency, retries and backoff, rate limiting, and graceful degradation.
• Ability to operate effectively in a high-ownership culture: you drive your work forward,unblock yourself, and hold yourself accountable to outcomes, not just effort.