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Senior Software Engineer - SMS Delivery

  • 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.

About the Team
The SMS Mobile team at Klaviyo is responsible for empowering the over 250,000 Ecommerce clients we work with on a global scale to deliver effective experiences on mobile devices. This team focuses on performance optimization and continuous development of our Mobile Marketing Channels (SMS and Push Notifications), Mobile SDKs (IOS and Android), and Klaviyo's own mobile applications. While Email was how Klaviyo began, SMS is truly the way of the future. As a result of this, we put a lot of emphasis around keeping the client experience top of mind while making sure our mobile applications are able to scale at large for many of today's fastest growing brands.
About the Role
The SMS Mobile Deliverability team is responsible for making sure that the messages that our clients send get sent through the right platform (Klaviyo), through the correct Carrier (AT&T, Verizon, etc), while also making sure that the message is delivered via the right device (Phone or mobile). In addition to this, there is always an eye towards compliance to make sure that the messages being sent and delivered are legal. Ultimately making sure that from signup to send, the experience is seamless. How
You will make an Impact
Our Mobile Deliverability team is a newly formed team and works closely with our two other mobile teams which are focused on building long lasting relationships with our clients and their audiences through SMS conversations and deliverability pipeline while keeping an eye on new market opportunities while optimizing our SMS Platform. Incoming members to the Mobile Deliverability Team will be responsible for building the foundation of how we scale internally at Klaviyo. You will have an opportunity to make a major impact on the direction and priorities of the team.
As an engineer on this team, you will be responsible for building and managing Klaviyo’s Customer Facing Mobile Application (with an emphasis on backend development) while also focusing on internal tooling working with various stakeholders across the company.
Technologies we use (not exhaustive):
  • Python, Django, React, RabbitMQ, Celery, MySQL, Cassandra, Redis
  • Amazon Web Services (EC2, RDS, Aurora, etc.)Terraform, Kuberentes, Splunk, Jenkins, Grafana, and other modern DevOps tools
What we are looking for
  • 5-7+ years of experience in a software engineering discipline
  • Significant experience with full stack application development
  • Experience working with both monolithic and microservices architectures
  • Experience with creating and refactoring databases that can withstand high query volumes
  • Experience with CI/CD pipelines
  • Experience debugging performance issues and improving application performance
  • Proven experience with being a coach and a mentor for team members and helping them grow
Nice to Have
  • Experience creating new applications with scalability in mind
  • Exposure to large-scale system design
  • Experience with AWS or any similar cloud provider

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.

Upon request, you can receive additional information about the compensation and benefits for this role. Requests can be submitted here . Additional information regarding benefits can be found at .

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.

You can find our Job Applicant Privacy Notice here .

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