Senior / Lead Security Engineer, Klaviyo
Cloud Infrastructure
$188-282k
3+ days a week in office
The autonomous B2C CRM
Job no longer available
The autonomous B2C CRM
1001+ employees
Job no longer available
$188-282k
3+ days a week in office
1001+ employees
Company mission
Klaviyo is the only autonomous CRM built for B2C brands. Powered by its built-in data platform and AI insights, Klaviyo combines marketing automation, analytics, and customer service into one unified solution, making it easy for businesses to know their customers and grow faster.
Role
Who you are
- We are looking for someone who is excited to bring their specialized skills to the team, shaping Klaviyo’s security practices and helping us continue to raise the bar
- Have 5+ years of experience in infrastructure or security engineering roles, with deep knowledge in one or more security focus areas (e.g., cloud security, IAM, endpoint security, data protection, detection engineering, compliance)
- Comfortable navigating ambiguity and defining priorities in a broad-scoped role
- Experienced working in modern cloud environments such as AWS, GCP, or Azure
- Familiar with infrastructure-as-code tools such as Terraform, CloudFormation, or Pulumi
- Proficient in secure systems design, threat modeling, and vulnerability management
- AI Agentic development and prompt engineering, MCP (AWS Bedrock, OpenAI, Anthropic)
- Able to clearly articulate complex security topics to technical and non-technical stakeholders
- Passionate about security, eager to learn from others and share your expertise
- Nice to have - certifications (e.g., CISSP, CKS, GCP/AWS Security certs) or equivalent practical experience
What the job involves
- As a Lead Security Engineer, you’ll be a vital part of the Infrastructure Security Team, focusing on strengthening the security posture across Klaviyo’s entire technology environment, developing security architectures and repeatable patterns and mentoring colleagues and junior security engineers
- Unlike roles with a narrowly defined specialty, this position offers the opportunity to demonstrate your unique expertise—whether that’s in cloud security, identity and access management, data protection, secure systems design, or other security domains
- Your work will involve evaluating and hardening our infrastructure, collaborating with cross-functional teams, and leveraging AI to build scalable solutions to address emerging threats
- Secure Klaviyo's infrastructure by designing, implementing, and maintaining scalable security controls across cloud, on-prem, and hybrid environments
- Evaluate and improve security configurations and policies across a range of technologies, using your domain expertise to reduce risk and enable secure-by-default architectures
- Collaborate with engineering and IT teams to embed security practices and develop repeatable security patterns across the development and deployment lifecycle
- Lead threat modeling, risk assessments, and architecture reviews in areas aligned with your specialty
- Develop automated solutions and infrastructure-as-code to drive consistent and reproducible security outcomes
- Stay ahead of the latest threats and advocate for innovative security solutions aligned with business needs
- Help define security standards and best practices at Klaviyo, championing their adoption across teams
Our take
Klaviyo is a marketing firm helping growth-focused eCommerce brands drive more sales with super-targeted, highly relevant email, Facebook and Instagram marketing campaigns. From personalised newsletters to automated emails when customers abandon their shopping carts, the marketing automation platform makes it easy for businesses to capture, store, analyze, and predictively use their own data to drive measurable, high-value outcomes.
Klaviyo's CEO, Bialecki, believes that the main problem with e-mail marketing today is that there is a divide between two kinds of tools: analytics tools that help you understand what people are doing on a website, such as what products they are considering, and messaging tools that send them a marketing e-mail. Operating primarily within the retail and eCommerce industry, Klaviyo aims to solve this by offering a tool that brings together analytics and messaging. This allows companies to bring all of their first-party data into a single platform to get a deep understanding of their customers and then activate that data to deliver highly-targeted, personalised communications through email and SMS. In the process, Klaviyo's customers get a deep understanding of their consumers.
Klaviyo is a fast-growing company mainly due to its business model - the firm offers a concrete ROI for Klaviyo’s clients if the software persuades customers to make purchases by treating different types of customers differently. An IPO in 2023 has led to Klaviyo's release of Klaviyo AI, which empowers businesses to unlock revenue-driving opportunities and deliver exceptional customer experiences across channels. Still in its early days of public listing, it will be interesting to see how Klaviyo fares in the years to come.
Freddie
Company Specialist at Welcome to the Jungle
Meet the team
Devin Bhatia, Customer Success Manager
Our mission
Create exceptional customer experiences by providing immediate and long-lasting value, while empowering creators to own their growth.Insights
4% employee growth in 12 months
Company
Employee endorsements
Opportunities to learn
"Not only we have a good stipend to spend on learning but we also have development days every quarter, where we can switch off and focus on the areas..."
Company benefits
- Private medical insurance
- Medical
- Dental
- Vision
- Lifestyle spending account
- Commuter benefits
- Modern Health - wellness platform
- Parental leave
- Company equity
- Employee stock purchase plan
- Mental health benefits
- Health savings account (HSA)
- Flexible spending accounts (FSAs)
- Employee assistance program (EAP)
- 401(k) plan with company match
- Flexible paid time off (FPTO)
- 13 company holidays
- Paid parental bonding leave
Company values
- Put customers first: We prioritize our customers > customers’ customers > team > ourselves. We empathize deeply with our customers by walking in their shoes and solving their greatest pain points. We start with what’s best for the customer, not what’s best for us, and work backwards, delivering experiences our customers will talk about.
- Win together: We’re one team, we get to know each other, we’re okay with conflict and willing to disagree and commit. We are honest, direct, transparent, and respectful. We seek and incorporate diverse perspectives and assume good intent.
- We’re 1% done: We’re just getting started – our greatest products, work, and achievements are in front of us. We have a beginner’s mindset – we see the opportunities to build and improve and have the ambition to go after them. We benchmark against the best, aim to beat them, and celebrate when we do.
- Know the score: We’re clear about what success is for each project and how it ladders to our overall success. Results are what matter. Working hard is required, but it’s not success. We use data and past performance to motivate our future strategy.
- Be meticulous in your craft: We seek to do work so good that people rave about it. We are rigorous, thorough and prepared. We are or expect to be the experts everyone in the world turns to.
- Move fast, no shortcuts: Speed matters. We set ambitious deadlines, we like short cycles and being first to market. We don’t skip critical steps or requirements to make a date. We’re comfortable living in the grey and making judgment calls to decide what’s required and what’s not.
- Drivers wanted: No passengers — we’re proactive and engaged, and if we see something wrong it’s our responsibility to fix it or raise the issue to its owner. Have a vision and make sure it’s compelling. No job is beneath us. If it needs to get done, we’re happy to pick it up. We use and spend resources like they’re our own.
- Stay hungry, stay humble: We are insatiably curious learners; our slopes are very high. If we don’t know something, we’re world- class at figuring it out. We take calculated risks and sometimes make mistakes — we’re not perfect. When we fail, we learn from it and improve going forward. Feedback is a gift, even if it hurts sometimes. We don’t tolerate brilliant jerks.
Company HQ
Dublin, Republic of Ireland
Articles
Leadership
Andrew Bialecki
(Founder and Co-CEO)Co-founder and Co-CEO. Previously CTO at RockTech, Senior Engineer at Performable, Lead Engineer at Applied Predictive Technologies and an SDET Intern at Microsoft
Ed Hallen
(Chief Strategy Officer)Co-founder and currently our Chief Strategy Officer. Previously worked in Enterprise Business Development at Google, Summer Associate at Accel-KKR and Principal at Applied Predictive Technologies.
Chano Fernandez
(Co-CEO)Chano serves as the co-CEO, leading all go-to-market functions at Klaviyo. He previously led organizations at SAP, Workday, and Eightfold.
Salary benchmarks
We don't have enough data yet to provide salary benchmarks for this role.
Submit your salary to help other candidates with crowdsourced salary estimates.
Share this job
View 208 more jobs at Klaviyo