Senior Full Stack Engineer - Customer Agent

About the role

The Customer Agent 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.

Responsibilities

• Develop and optimize end-to-end software solutions using both front-end and back-end technologies.
• Lead key initiatives that enhance product offerings and support company growth.
• Act as a leader and mentor, driving key technology decisions and initiatives.
• Deploy well-designed, thoroughly tested solutions ensuring reliability and performance.
• Experiment with AI in work or personal projects, and build smarter systems and ways of working from the ground up.

Requirements

• 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.
• Skills with Python and related technologies.
• Skills with React and related technologies.
• Experience developing digital marketing or customer data software solutions.
• Experience with machine learning.
• Experience building cloud-native solutions, ideally with AWS.

Qualifications

• Nice to have:
• Experience with AI and responsible use of AI (including privacy, security, bias awareness, and human-in-the-loop).

Skills

• Python and related technologies.
• React and related technologies.
• Experience with machine learning.
• Experience building cloud-native solutions, ideally with AWS.

Benefits

Transform workflows by putting AI at the center, building smarter systems and ways of working from the ground up.

Pay

$116,000—$174,000 USD

Schedule

Remote Only