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 klaviyo.com/careers to see how we empower creators to own their own destiny.
About the Role
At Klaviyo, we believe the future of software lies not in productivity tools for human users but in software that can run and optimize itself based on outcome or reward metrics. We’ve built the infrastructure and application that serve as the interface between businesses and consumers. We now have over 167,000 customers, billions of consumer profiles, and hundreds of billions of customer messages and follow-on conversion data. We have a big opportunity to build state-of-the-art AI and machine learning technologies at Klaviyo to power our products and develop AI agents that can automatically create and execute marketing or customer experiences, strategies, and campaigns for any business.
Our team is looking for a Sr. Software Engineer to join Flows AI. You’ll help build the backend systems and product experiences behind our AI agent capabilities in Klaviyo’s Flows product. Flows is a core part of Klaviyo that helps marketers automate personalized customer journeys across channels, and our team is focused on making those journeys easier to create, manage, and improve with practical AI. You’ll partner closely with product managers, machine learning engineers, and data scientists to deliver customer impact at scale. This is a full-stack role with opportunities to shape architecture, async processing pipelines, and distributed systems.
How You Will Make a Difference
- Drive the technical design and implementation of customer-facing AI capabilities within Klaviyo Flows.
- Own projects end to end, from working through ambiguity and refining requirements to shipping and operating production features.
- Build reliable, scalable full-stack systems, including backend services, async processing pipelines, and product experiences that help marketers create and improve automated journeys.
- Partner proactively with product, design, and engineering teammates to shape priorities and deliver measurable customer value.
- Raise the bar for engineering quality, operational health, and technical strategy in a fast-moving product area.
Who You Are
- 5-7 years of professional experience in full-stack software engineering.
- Have a track record of building and maintaining high-scale, customer-facing product features.
- Bring experience shipping AI-powered product capabilities or other complex, ambiguous product initiatives in production.
- Experience creating human and automated evals to ensure high AI model quality.
- Hands-on experience with one or more front end technologies (React, TypeScript, Angular, Vue, etc.)
- Experience with Python / Django or similarly typed languages.
- Experience with designing and managing scalable databases.
- Experience with asynchronous processing and distributed task queues (Celery, Kafka, SQS, RabbitMQ, Redis).
- Experience with cloud-native architectures (AWS) and container orchestration (Kubernetes); can manage infrastructure and CI/CD pipelines.
- Hands-on experience with building REST APIs, GraphQL, and other middleware development tools.
- Able to operate with a high degree of autonomy, handle ambiguity, and thrive in a fast-moving, startup-like environment.
- Driven by curiosity. You're someone who learns and stays up to date with this rapidly evolving field.
- Comfortable collaborating directly with product managers and customers to shape solutions.
- Thrive in customer-focused, fast-moving environments and help make the team around you more effective.
Nice to Have
- Experience with workflow builders, automation products, or journey-orchestration style systems
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.
This role may require up to 10% travel for purposes such as new hire onboarding, client or partner work if applicable, team meetings, and industry events. Travel is coordinated in advance.
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.
Skills Required
- 5-7 years professional full-stack software engineering experience
- Experience building and maintaining high-scale, customer-facing product features
- Experience shipping AI-powered product capabilities or complex production initiatives
- Experience creating human and automated evaluations for AI model quality
- Hands-on experience with front-end technologies (React, TypeScript, Angular, Vue)
- Experience with Python and Django or similarly typed languages
- Experience designing and managing scalable databases
- Experience with asynchronous processing and distributed task queues (Celery, Kafka, SQS, RabbitMQ, Redis)
- Experience with cloud-native architectures (AWS) and container orchestration (Kubernetes); manage infrastructure and CI/CD
- Hands-on experience building REST APIs, GraphQL, and middleware
- Ability to operate with high autonomy, handle ambiguity, and thrive in fast-moving environments
- Comfortable collaborating directly with product managers and customers
- Experience with workflow builders, automation products, or journey-orchestration systems
What the Team is Saying
Klaviyo Compensation & Benefits Highlights
How does Klaviyo ensure its pay and bonus plans are competitive?
Klaviyo supports competitive pay through a total rewards approach that combines salary, equity, bonus opportunities, benefits, learning support and a performance culture tied to measurable impact.
- Competitive total rewards: Klaviyo’s benefits overview highlights competitive salaries, 401(k) match, employee referral bonuses, equity, an employee stock purchase plan, flexible paid time off, commuter/transit support, fitness reimbursements, mental and emotional wellbeing programming and learning support. External reviews reinforce the value of the package, with employees citing competitive pay, bonuses, RSUs, ESPP, health insurance, parental leave, unlimited PTO and learning stipends as meaningful parts of the employee experience.
- Pay connected to impact and outcomes: Klaviyo’s handbook frames performance around ownership, clarity and measurable results. The value “Know the score” states that results matter more than effort alone, while “Drivers wanted” emphasizes proactive ownership and “Be meticulous in your craft” reinforces a high bar for work quality. That creates a compensation and recognition philosophy where strong outcomes, not just activity, are central to advancement and rewards.
- Equity and long-term value: Equity is a visible part of Klaviyo’s rewards story. Klaviyo offers equity packages to all full-time employees, vesting over four years, and provides an employee stock purchase plan. That ownership opportunity sits within a growing business: in Q1 2026, Klaviyo reported $358 million in revenue, up 28% year over year, and raised full-year 2026 revenue guidance to $1.514 billion to $1.522 billion. Those business results give employees a clear connection between company performance, long-term growth and the value of ownership-based compensation.
- Rewards supported by growth and development benefits: Klaviyo’s compensation package is paired with benefits that help employees grow their careers and build long-term value. K-Pro Learn, learning stipends, mentorship, Career Architecture and manager development programs support continued skill-building. A customer success manager noted that Klaviyo offers a learning stipend for job-related coaching or training, while employee survey insights show 78% of respondents feel they are gaining the skills and experience to grow their careers.
- External signals:
- Compensation Sentiment: External reviews frequently praise Klaviyo’s competitive salary, bonuses, equity, RSUs, ESPP, 401(k) match, learning stipend and generous benefits. (Glassdoor; Comparably)
- Rewards Ratings: Comparably rates Klaviyo’s compensation an A and perks and benefits an A. (Comparably)
- Employee Value Signals: Reviews highlight PTO, health insurance, parental leave, office amenities, learning support and work-life balance as part of the overall rewards package. (Glassdoor; Comparably)
Bottom line: Klaviyo keeps compensation competitive by combining salary, bonus opportunities, equity, ESPP, retirement support, benefits and learning resources with a culture that rewards ownership, measurable outcomes and long-term impact.
Klaviyo Insights
What We Do
Klaviyo (NYSE: KVYO) is the B2C CRM. Powered by its built-in data platform and AI, Klaviyo combines marketing automation, analytics, and customer service into one unified solution, making it easy for businesses to know their customers and grow faster. Klaviyo (CLAY-vee-oh) helps over 183,000 brands like Mattel, Glossier, Daily Harvest, and Liquid Death deliver 1:1 experiences at scale, improve efficiency, and drive revenue.
Why Work With Us
We refer to our employees as ‘Klaviyos’, and we make up a diverse community united around shared values: We’re curious, collaborative, driven, innovative, fun, and fully ourselves at work. No matter which team you join, your work won’t just impact Klaviyo. It’ll help empower our customers and enable creators across the globe to own their destinies.
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Klaviyo Offices
Hybrid Workspace
Employees engage in a combination of remote and on-site work.
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