Senior Software Engineer - New Products

About the Role

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.

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, drive key technology decisions, and be responsible for deploying well‑designed, thoroughly tested solutions that ensure reliability and performance.

The New Products team drives Klaviyo’s most ambitious innovations—creating and scaling the company’s boldest new bets. 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.

What We’re Looking For

• A proven track record of building high‑quality products and systems, with pride in writing clean, high‑quality code.
• 7+ years of experience in a software engineering role.
• Strong experience developing end‑to‑end software solutions or extensive experience with both front‑end and back‑end technologies.
• Experience leading projects and being accountable for their outcomes.
• Experience mentoring team members or driving initiatives that help the team learn new skills.
• Experience conducting code reviews and running a robust testing cycle.
• Experience working in agile, fast‑paced environments.

Nice to Have

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