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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 E-commerce 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 Klaviyos 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

Klaviyo is a world-leading marketing automation platform dedicated to accelerating revenue and customer connection for online businesses. Klaviyo makes it easy to store, access, analyze and use transactional and behavioral data to power highly-targeted customer and prospect communications. The company's hybrid customer-data and marketing-platform model allows companies to grow by fostering direct relationships with customers, without giving up their valuable data to popular big-tech ad platforms. Over 265,000 innovative companies like Unilever, Custom Ink, Living Proof and Huckberry sell more with Klaviyo. Learn more at .

If you are a Colorado or New York City resident and this role is a remote role, you can receive additional information about the compensation and benefits for this role, which we will provide upon request. Requests can be submitted here . Additional information regarding benefits can be found here .

Klaviyo is committed to diversity and to a policy of equal employment opportunity and non-discrimination. We do not discriminate on the basis of race, color, religion, national origin, age, sex, marital status, ancestry, physical or mental disability, veteran status, gender identity, sexual orientation or any other characteristic protected by applicable law.

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