Senior Full Stack Engineer - New Product

<div class="content-intro"><p><em>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 <a class="_ymio1r31 _ypr0glyw _zcxs1o36 _mizu194a _1ah3dkaa _ra3xnqa1 _128mdkaa _1cvmnqa1 _4davt94y _4bfu18uv _1hms8stv _ajmmnqa1 _vchhusvi _kqswh2mm _ect4ttxp _syaz13af _1a3b18uv _4fpr8stv _5goinqa1 _f8pj13af _9oik18uv _1bnxglyw _jf4cnqa1 _30l313af _1nrm18uv _c2waglyw _1iohnqa1 _9h8h12zz _10531ra0 _1ien1ra0 _n0fx1ra0 _1vhv17z1" href="http://klaviyo.com/careers" data-renderer-mark="true">klaviyo.com/careers</a> to see how we empower creators to own their own destiny.</em></p></div><p><strong>About the Role</strong></p> <p>Our team is looking for a Senior Full Stack Engineer to lead key initiatives that will enhance our product offerings and support our company’s growth. In this role, you'll play a crucial part in shaping outcomes by developing innovative end-to-end solutions using both front-end and back-end technologies. You’ll optimize existing products and create new solutions that redefine what’s possible for our customers.</p> <p>As a Senior Engineer, you’ll tackle complex challenges, develop multiple solutions, and evaluate business and technical trade-offs to determine the best path forward. You’ll also act as a leader and mentor, and drive key technology decisions. Additionally, you’ll be responsible for deploying well-designed, thoroughly tested solutions that ensure reliability and performance.</p> <p>The New Products team drives Klaviyo’s most ambitious innovations—creating and scaling the company’s boldest new bets. As a nimble group with a flat structure and fast-moving culture, we prioritize simplicity, speed, and impact. Every team member is expected to take radical ownership—rolling up their sleeves, collaborating across disciplines, and pushing beyond traditional role boundaries to make things happen. Success in this role means delivering exceptional work that sets the standard for velocity and results company-wide, while helping shape Klaviyo’s future through experimentation, creativity, and executional excellence.</p> <p><strong>What We’re Looking For</strong></p> <ul> <li>A proven track record of building high-quality products and systems, with pride in writing clean, high-quality code.</li> <li>7+ years of experience in a software engineering role.</li> <li>Strong experience developing end-to-end software solutions or extensive experience with both front-end and back-end technologies.</li> <li>Experience leading projects and being accountable for their outcomes.</li> <li>Experience mentoring team members or driving initiatives that help the team learn new skills.</li> <li>Experience conducting code reviews and running a robust testing cycle.</li> <li>Experience working in agile, fast-paced environments.</li> <li>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.</li> <li>Transform workflows by putting AI at the center, building smarter systems and ways of working from the ground up.</li> </ul> <p><strong>Nice to Have</strong></p> <ul> <li>Skills with Python and related technologies</li> <li>Skills with React and related technologies</li> <li>Experience developing digital marketing or customer data software solutions.</li> <li>Experience with machine learning.</li> <li>Experience building cloud-native solutions, ideally with AWS.</li> </ul> <p>We use Covey as part of our hiring and / or promotional process. For jobs or candidates in NYC, certain feat ... (truncated, view full listing at source)