Senior Software Engineer - SMS Delivery

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 careers.klaviyo.com to see how we empower creators to own their destiny.

Why You Should Join the SMS Delivery Team :

The SMS Delivery enables our customers to confidently select the right sender IDs for their marketing needs—and to register and activate those IDs through a single, intuitive, and transparent workflow. The experience is designed to be cross-channel, eliminate redundant data entry, and get customers up and sending messages quickly while meeting defined SLAs. As regulations evolve, we ensure our customers remain fully informed and compliant with all new and changing requirements.

As a Senior Software Engineer on the team, you’ll play a key role in designing and building scalable systems that power our editor experiences across all the editors. Partnering closely with product managers and technical product owners, you’ll help define scope, translate ideas into practical implementations, and build intuitive editing tools that delight our users. This role leans frontend, with a strong focus on crafting thoughtful, reusable components and seamless user experiences using technologies like React, Python, and Django. There are ample opportunities for growth given the scope of this role and the team’s central role in Klaviyo’s product.

Over the past year, our team has enhanced the managing senders, across multiple channels and incorporating more api driven way to editor interfaces with impactful features that our customers love—and they’re eager to see that same power brought to other mobile experiences. Looking ahead, we’ll be investing in new editor blocks, a personalization builder, in-canvas editing, and content generation powered by AI. You’ll contribute directly to these efforts, helping Klaviyo extend its best-in-class editing tools across platforms.

How You Will Make a Difference :

• You will be a core member of the Editors platform team, working on impactful customer-facing features that will make our product the best in the industry.
• You will work on creating easy-to-use editors that are highly performant.
• You will work closely with Product, Design, and Data Science to provide the best experience for our customers.
• Transform workflows by putting AI at the center, building smarter systems and ways of working from the ground up.

Who You Are :

Technologies We Use (not exhaustive) :

Massachusetts Applicants :

It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.

Base Pay Range For US Locations :

$152,000 — $228,000 USD

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.

AI fluency at Klaviyo includes responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop). We provide accommodations as needed.

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.

IMPORTANT NOTICE : Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls.

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