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

The Email Platforms team 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 are investing in our homegrown email delivery infrastructure to gain greater control, performance, and reliability for some of the world's largest brands.

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 Back End development in Go, this is the role for you.

• 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

• Senior-level Back End engineer with strong systems design skills
• Proficient in Go (required). Experience with Python is a plus. Experience with high-throughput distributed systems
• Familiar with message queues (eg, 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 experimented with AI in work or personal projects and are eager to learn fast; you're interested in responsibly exploring new AI tools and workflows

• Languages: Go, Python
• Infrastructure: AWS, DynamoDB, Kubernetes, Terraform
• Frameworks: Gin (Go), Django (Python)
• Messaging: Pulsar, Kafka, other message queues
• Email Systems: MTA and Proxy servers, email deliverability tools, monitoring tools

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. Our policy includes an independent bias audit report and related disclosures. Please see the independent bias audit report covering our use of Covey and the relevant privacy notices.

Massachusetts Applicants: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. Our salary range reflects the cost of labor across various U.S. geographic markets and includes base pay plus potential bonuses and equity where applicable. Your recruiter can provide more details about the specific salary/OTE range for your location during the hiring process.

Your total compensation may include base salary, annual bonus plan, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility.

We're Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable. We seek remarkable creators-ambitious and collaborative teammates who stay focused on delighting our customers. If you're ready to do the best work of your career, you'll be welcomed as your whole self from day one and supported with generous benefits.

AI fluency at Klaviyo includes responsible use of AI (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 and will adhere to our guidelines for using AI in the Klaviyo interview process and our Job Applicant Privacy Notice.

Klaviyo is an equal opportunity employer. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex, gender identity, sexual orientation, disability, veteran status, marital status, or any other characteristic protected by law.

Important notice: We do not ask for payment, bank details, or personal financial information as part of the application process. All legitimate job postings are on our official career site. By submitting an application you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice.