Boston, Massachusetts, United States · On-site
$148k–$222k/yr
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 appr…
Skills: Python, Golang, AWS, Kubernetes, Terraform
Dublin, Leinster, Ireland · On-site
$112k–$168k/yr
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 appr…
Skills: Infrastructure Security, Software Engineering, AI Fluency, Data Privacy, Security Engineering
Dublin, Leinster, Ireland · Hybrid
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 appr…
Skills: Sales Cycle Management, MarTech SaaS, Outbounding, Relationship Building, Pipeline Management
Dublin, Leinster, Ireland · On-site
$88k–$132k/yr
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 appr…
Skills: Sales Enablement, MEDDPICC, BANT, Strategic Planning, Workshop Design
Sydney, New South Wales, Australia · On-site
$124k–$186k/yr
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 appr…
Skills: Account Management, Program Management, Strategic Consulting, Stakeholder Alignment, Customer Relationship Management
Dublin, Leinster, Ireland · Hybrid
$76k–$114k/yr
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 appr…
Skills: System Architecture, Scalability, Python, Django, React
Dublin, Leinster, Ireland · Hybrid
$92k–$138k/yr
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 appr…
Skills: System Architecture, Scalability, Python, Django, React
Dublin, Leinster, Ireland · Hybrid
$112k–$168k/yr
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 appr…
Skills: Backend Engineering, Distributed Systems Design, Python, Go, AWS
Boston, Massachusetts, United States · Hybrid
$147k–$210k/yr
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 appr…
Skills: Salesforce Apex, Salesforce Flows, Salesforce Visualforce, Lightning Components, Data Modeling
Dublin, Leinster, Ireland · Hybrid
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 appr…
Skills: Sales Cycle Management, MarTech SaaS Sales, Outbounding, Pipeline Management, Relationship Building
Dublin, Leinster, Ireland · Hybrid
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 appr…
Skills: Outbound Prospecting, Lead Generation, Spanish Fluency, English Fluency, Sales Strategy
Quinte West, Ontario, Canada · On-site
$142k–$212k/yr
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 appr…
Skills: Detection Engineering, Incident Response, Security Observability, Python, Go
Boston, Massachusetts, United States · On-site
$116k–$174k/yr
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 appr…
Skills: Python, React, Django, FastAPI, Typescript
Quinte West, Ontario, Canada · Hybrid
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 appr…
Skills: Consultative Selling, ROI Analysis, Pipeline Management, Multi-threading, Executive Engagement
Boston, Massachusetts, United States · On-site
$168k–$252k/yr
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 appr…
Skills: Product Strategy, Developer Experience, AI Integration, Engineering Productivity Metrics, Stakeholder Management
Boston, Massachusetts, United States · On-site
$164k–$246k/yr
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 appr…
Skills: Product Management, Finance Systems Architecture, ERP Implementation, SOX Compliance, AI Implementation
Boston, Massachusetts, United States · On-site
$140k–$210k/yr
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 appr…
Skills: Order to Cash (O2C), ERP Architecture, SOX Compliance, IT General Controls (ITGC), AI Implementation
San Francisco, California, United States · Hybrid
$162k–$174k/yr
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 appr…
Skills: Python, AWS Cloud Technologies, Agile Scrum, UI/UX, Database Refactoring
San Francisco, California, United States · Hybrid
$214k–$264k/yr
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 appr…
Skills: System Design, Platform Architecture, Performance Optimization, Infrastructure Improvement, Code Quality
Boston, Massachusetts, United States · Hybrid
$131k–$174k/yr
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 appr…
Skills: Python, Bash, Shell, Linux, AWS CloudFormation
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Design, build, and maintain cloud-native security services and infrastructure to help engineers ship secure software. Focus on improving the availability, scalability, and efficiency of distributed security systems while participating in on-call rotations.
Requires 6+ years of experience building cloud-native distributed systems with proficiency in Python or Go and AWS. Candidates must have hands-on experience with Kubernetes, Terraform, and secure system design fundamentals.
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.
The Infrastructure Security team makes it simple and easy for engineers to make secure choices while developing world-class software at high speed. Security is built in by default—seamless and effortless—making engineers’ lives better and Klaviyo more secure.
Our work sits at the intersection of security, infrastructure, and software engineering. We build cloud-native platforms and services that are reliable, secure, and performant at global scale, forming the foundation that Klaviyo engineers rely on every day.
This role is for engineers who enjoy building modern distributed systems, care about security and reliability, and want to have real impact across a large engineering organization.
As a Senior Software Engineer on the Infrastructure Security team, you will build and operate the systems that help Klaviyo engineers ship secure software with confidence. You will:
Klaviyo’s platform is primarily built with Python and React and runs on AWS. Engineers join us from a wide range of technical backgrounds and are supported in learning our stack. Core technologies include:
This role is based in Boston, Massachusetts. Klaviyo supports work authorization and relocation for this position.
At Klaviyo, we enjoy tackling meaningful engineering challenges and value people who take ownership, learn continuously, and collaborate openly. We are committed to building inclusive teams and encourage applications from candidates of all backgrounds.
Klaviyo is growing fast and we have openings for all skill levels across all of our teams. Learn more about our engineering culture at https://klaviyo.tech
We use Covey as part of our hiring and / or promotional process. For jobs or candidates in NYC, certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using Covey Scout for Inbound on April 3, 2025.
Please see the independent bias audit report covering our use of Covey here
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.
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.
Klaviyo is the autonomous CRM for B2C brands, built to turn what you know about your customers into real growth.
Klaviyo (NYSE: KVYO) is the autonomous 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 193,000 brands like Mattel, Glossier, Daily Harvest, and Liquid Death deliver 1:1 experiences at scale, improve efficiency, and drive revenue.
Offices: 125 Summer St, Floor 7, Boston, Massachusetts 02110, US · 106 Fenchurch Street, 5th Floor, London, England EC3M 5JF, GB · 420 George St, Floor 17, Sydney, NSW 2000, AU · 1615 Platte St, Denver, Colorado 80202, US · 181 Fremont St, Floor 21, San Francisco, California 94105, US
Klaviyo is the autonomous CRM for B2C brands, built to turn what you know about your customers into real growth.
Klaviyo (NYSE: KVYO) is the autonomous 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 193,000 brands like Mattel, Glossier, Daily Harvest, and Liquid Death deliver 1:1 experiences at scale, improve efficiency, and drive revenue.
Offices: 125 Summer St, Floor 7, Boston, Massachusetts 02110, US · 106 Fenchurch Street, 5th Floor, London, England EC3M 5JF, GB · 420 George St, Floor 17, Sydney, NSW 2000, AU · 1615 Platte St, Denver, Colorado 80202, US · 181 Fremont St, Floor 21, San Francisco, California 94105, US
