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 Team
The Mobile Platforms team at Klaviyo is responsible for empowering the over 150,000 Ecommerce clients we work with on a global scale to deliver effective experiences on mobile devices. This team focuses on performance optimization and continuous development of our Mobile Marketing Channels (SMS, Push Notifications, In App Messages, WhatsApp and RCS), Mobile SDKs (iOS, Android and React Native). While Email was how Klaviyo began, Mobile messaging is truly the way of the future.
The Mobile Platforms team works with multiple stakeholders to provide the best in class service and reliability to connect a wide range of customers, from entrepreneurs to enterprises, with their end users. The messaging platform for Klaviyo delivered over 100 million messages during Black Friday 2023.
About the Role
As a Lead II Software Engineer joining the Mobile Platforms team you can expect to be deeply involved in the establishment of a technical vision and roadmap for the overall space.
You would get a chance to be also a part of the team that works on the development of the next generation of mobile messaging platforms.
You will make an Impact
- Build and improve systems for high volume message delivery using multiple channels keeping in mind the overall user experience.
- Provide technical leadership to drive architectural decisions across multiple teams and provide solutions for complex problems around scalability, throughput, performance etc.
- Strive towards a cohesive technical vision across multiple roadmap items that are built across multiple teams.
- Defines technical strategy within their scope and executes to improve the area's products, infrastructure, or processes.
- Mentors multiple engineers to develop new technical leadership for the company.
Technologies we use (not exhaustive):
- Python, Django, Go, React, RabbitMQ, Celery, MySQL, DynamoDB, Redis
- Amazon Web Services (EC2, RDS, Aurora, etc.), Terraform, Kubernetes, Splunk, Jenkins, Grafana, and other modern DevOps tools
What we are looking for
- 10+ years of experience and have architected, built and delivered one or more complex systems.
- Have multiple years of proven experience building products that matter and pushing yourself and your team to be better engineers and build a product with passionate advocates
- Have proven that you can build & scale complex distributed systems including solving problems in sustainable ways, balancing pragmatic development with ideal architecture, breaking through technical obstacles with vigor, and leading teams through crises by working side by side with them in the trenches.
- Have experience in leading large scale initiatives across multiple teams spanning multiple months.
- Enjoys working with new technologies ranging from the frontend to backend, and are particularly passionate and an expert in multiple stack areas. You show this by having strong and opinionated experience with various technologies and know how to pick the right tool for any job.
- Loves digging into performance and scalability issues to drive breakthrough solutions, whether it's a slow loading UI or too many clicks in a workflow, a database query timing out, or a queue that just won’t drain. You recognize all problems can be solved.
- Enjoy shipping code early & often in an agile fashion, pairing with product management to craft better software by soliciting feedback from tens of thousands of end users.
- Like working on small, autonomous agile teams. At Klaviyo, you will have ownership of features, but you'll collaborate with everyone to make sure we produce the right solution.
Nice to Have
- Experience with messaging platforms and technologies.
- Exposure to large-scale system design
- Experience with AWS or any similar cloud provider
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. Please visit Klaviyo Rewards to find out more about our Total Rewards package.
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.
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.