Senior Software Engineer - Email Platforms

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

Why You Should Join the Email Platforms Team:

The Email Platforms team at Klaviyo is building the next generation of infrastructure to support reliable, scalable, and performant email delivery. Our mission is to help Klaviyo reach enterprise scale by evolving and owning our email sending pipeline end-to-end. We're investing heavily in our homegrown email delivery infrastructure, giving us greater control, performance, and reliability in how we deliver emails for some of the largest brands in the world.

You’ll join a high-impact, high-ownership team tackling technical challenges around high-throughput systems, distributed messaging, and service performance at scale. Our work directly impacts customer satisfaction and business success. If you’re excited about email infrastructure, systems design, and high-scale backend development in Go, this is the role for you.

How You Will Make a Difference:

• Own and drive key components of the email pipeline architecture


• Design and implement scalable, high-throughput services in Go


• Develop systems that manage message queues and email delivery


• Help ensure our systems scale with customer growth, especially as we bring on larger enterprise accounts


• Collaborate cross-functionally to ensure the highest standards of performance, reliability, and deliverability


• Transform workflows by putting AI at the center, building smarter systems and ways of working from the ground up.

Who You Are:

• Senior-level backend engineer with strong systems design skills


• Proficient in Go (required). experience with Python is a plusExperienced working with high-throughput distributed systems


• Familiar with message queues (e.g., Pulsar, Kafka, RabbitMQ, SQS)


• Bonus: Experience with email infrastructure, MTAs, deliverability, or mailops


• Comfortable working independently on projects from design through production


• Able to thrive in a mostly remote team and deliver in a high-autonomy environment


• You’ve already experimented with AI in work or personal projects, and you’re excited to dive in and learn fast. You’re hungry to responsibly explore new AI tools and workflows, finding ways to make your work smarter and more efficient.

Technologies We Use:

• Languages: Go, Python


• Infrastructure: AWS, DynamoDB, Kubernetes, Terraform

Frameworks: Gin (Go), Django (Python)

• Messaging: Pulsar, Kafka, other message queues


• Email Systems: MTA’s (GreenArrow), Proxy servers, email deliverability tools, monitoring tools

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