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 own destiny.
About the Role
We’re looking for a Software Engineer II to help build and scale new products that will define Klaviyo’s next phase of growth. In this role, you’ll work on meaningful, end-to-end features—contributing production-ready code across frontend and backend systems while growing your technical depth and product intuition.
You’ll collaborate closely with senior engineers, product managers, and designers to deliver well-crafted solutions. This role is ideal for engineers who are ready to take on more ownership, tackle increasingly complex problems, and sharpen their skills in a fast-moving, high-impact environment.
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—learning quickly, contributing broadly, and pushing beyond traditional role boundaries. Success in this role means delivering reliable, high-quality work, growing rapidly as an engineer, and helping the team move fast without sacrificing quality.
What You’ll Do- Design, build, and ship end-to-end product features with guidance from senior engineers.
- Write clean, well-tested, maintainable code across frontend and backend systems.
- Participate in technical design discussions and contribute thoughtful solutions.
- Debug, optimize, and improve existing systems.
- Collaborate closely with Product and Design to deliver customer-focused solutions.
- Participate in code reviews and learn best practices for testing and production readiness.
- Experiment with AI tools and workflows to improve efficiency and learning.
- A strong foundation in building high-quality software systems.
- 3–5 years of professional software engineering experience.
- Experience working across either frontend or backend systems, with exposure to both.
- Comfort owning small-to-medium scoped projects or features.
- Experience working in agile, fast-paced environments.
- A growth mindset and eagerness to learn new technologies and approaches.
- Interest in experimenting with AI tools and incorporating them into your workflow.
- Experience with Python and related technologies.
- Experience with React or modern frontend frameworks.
- Exposure to digital marketing, data platforms, or customer-facing products.
- Familiarity with cloud-based systems, ideally AWS.
- Exposure to machine learning or AI-powered features.
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.
Our salary range reflects the cost of labor across various U.S. geographic markets. The range displayed below reflects the minimum and maximum target salaries for the position across all our US locations. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location.
In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility.
Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process.
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.
By participating in Klaviyo’s interview process, you acknowledge that you have read, understood, and will adhere to our Guidelines for using AI in the Klaviyo interview Process. For more information about how we process your personal data, see our Job Applicant Privacy Notice.
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.
Top Skills
Klaviyo Boston, Massachusetts, USA Office
We're in the heart of the Financial district with easy access to public transportation and a short walk from South Station. We also have hubs in Denver, London and Sydney.
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