Preparation at Klaviyo requires a balance of architectural thinking and a "builder" mindset. You should be prepared to discuss not just the "how" of your technical decisions, but the "why"—specifically regarding business impact and scalability.

• Technical Depth: Demonstrate proficiency in Python and your ability to design scalable systems using cloud-native tools like AWS and Kubernetes. Be prepared to dive deep into your past projects and explain the rationale behind your architectural choices.
• Problem-Solving Ability: We value engineers who can decompose complex, ambiguous problems into manageable, iterative steps. Show us how you handle constraints and how you validate your solutions through data.
• Leadership & Communication: As a manager, your ability to articulate technical strategy to cross-functional partners is key. Practice explaining how your platform work directly enables product success.
• Culture & Values: Klaviyo thrives on ownership, curiosity, and a customer-first mindset. Reflect on how your leadership style encourages these traits within your team.

The interview process at Klaviyo is designed to be rigorous yet collaborative, reflecting our commitment to both technical excellence and team culture. You will navigate a series of stages that evaluate your hands-on coding skills, your system design expertise, and your ability to lead and grow a team. The pace is generally fast, and you can expect high-signal interactions where interviewers will push you to justify your design decisions under pressure.

This timeline provides a high-level view of our evaluation stages. You should interpret the progression as an increasing shift from individual technical capability to broader organizational and leadership impact. Use this structure to pace your preparation, ensuring you are equally ready for deep-dive coding sessions and high-level strategy discussions.

System Design & Architecture

This is the cornerstone of the ML Platform Engineer role. We evaluate your ability to architect systems that are durable, scalable, and observable.

• Distributed Systems – Understanding consistency, availability, and partitioning in large-scale data environments.
• Cloud Infrastructure – Expertise in AWS services and the orchestration of containerized workloads.
• Data Pipelines – Designing for high-throughput batch and streaming data processing.

Be ready to go over:

• Designing for failure: How your systems handle partial outages.
• Cost-aware architecture: Balancing performance with cloud spend.
• Scalability patterns: How your platform handles 10x growth in traffic.

ML Lifecycle Management

We need to know that you understand the end-to-end flow from training to deployment.

• Model Deployment – Patterns for serving models at scale.
• Experimentation Platforms – Enabling rapid iteration for ML researchers.
• Monitoring & Observability – Tracking model performance and system health.

Example scenarios:

• "Design a platform to handle the deployment of LLMs with varying latency requirements."
• "How do you manage dependencies and environment consistency for hundreds of ML models?"

As an Engineering Manager for the ML Platform team, your primary responsibility is to remove friction for our data scientists and ML engineers. You will own the roadmap for our training and inference platforms, ensuring that our infrastructure is not only robust but also provides a "paved path" for internal teams to move fast.

You will lead a team of 6–10+ engineers, balancing the day-to-day maintenance of existing systems with the development of new capabilities. Collaboration is critical; you will work closely with product, data science, and infrastructure partners to ensure that our platform strategy remains aligned with the company's "north star" of delighting customers through personalized experiences.

We look for candidates who bring a mix of deep technical expertise and strong people leadership. While we encourage you to apply even if you don't meet every single bullet point, the following are central to the role:

• Must-have skills: 7+ years of software engineering experience, 2+ years of formal people leadership, strong proficiency in Python, and deep experience with cloud infrastructure (AWS, Kubernetes) and data-intensive systems (Spark, Ray).
• Nice-to-have skills: Experience with LLM orchestration, advanced cost-optimization strategies for ML, and a background in building internal developer platforms (IDP).

Q: How long does the interview process typically take? A: While it varies based on scheduling and team needs, most candidates complete the cycle within 3 to 5 weeks. We aim to be respectful of your time while ensuring we have a complete picture of your fit for the role.

Q: What is the most important trait for a candidate to demonstrate? A: We prioritize "ownership." We look for leaders who don't just assign tasks but take full responsibility for the success of their platform, the growth of their team, and the reliability of the systems they support.

Q: How much of the role is "hands-on"? A: This is a hands-on technical leadership role. You will be expected to review code, participate in design sessions, and occasionally contribute to critical path development to keep your technical skills sharp and your understanding of the platform deep.

• Think in Trade-offs: When answering system design questions, always state the trade-offs. We don't expect a perfect system; we expect a well-reasoned one.
• Use the STAR Method: For behavioral questions, structure your answers using Situation, Task, Action, and Result. This keeps your stories concise and impact-focused.
• Be Curious: Ask questions about our specific technical challenges with Ray or our data scaling efforts. It shows you’ve done your research and are genuinely interested in our work.

The ML Platform Engineering Manager role at Klaviyo is a unique opportunity to shape the infrastructure that powers the future of personalized marketing. By focusing on your ability to design scalable systems, lead high-performing teams, and drive technical strategy, you will be well-positioned to succeed in our process.

We encourage you to review your own experiences against our core evaluation areas and prepare concrete examples of your impact. Remember that we are looking for partners in our mission to empower creators. For further insights and to track your progress, continue exploring resources on Dataford. You have the potential to make a massive impact here—good luck with your preparation.

The provided salary data reflects the base pay range for this position across our U.S. locations. It is important to interpret these figures as a baseline; final offers are determined by a variety of factors, including your specific experience, technical depth, and the geographic market of the role. Use this range to manage your expectations and prepare for compensation discussions with your recruiter.