Greenhouse ·
full-timeAI Engineer II
Klaviyo · Boston, MA
Klaviyo provides marketing automation and customer data platform services that help e-commerce businesses create personalized email and SMS campaigns. As an AI Engineer II on the Customer Agent team, you will design and maintain backend services and APIs that power Klaviyo's AI-native conversational platform. Day-to-day work includes building reliable agentic features that retrieve context, use tools, and execute multi-step workflows; developing retrieval-augmented generation pipelines; implementing evaluation suites with datasets, automated and human checks; and improving system reliability through guardrails, observability, and failure handling. You will also participate in an on-call rotation, troubleshoot production incidents, and collaborate with product and customer-facing teams to turn feedback into improvements. The role suits engineers with three or more years of backend software experience, hands-on exposure to generative or agentic AI applications, proficiency in Python and frameworks such as FastAPI or Django, familiarity with asynchronous task systems (e.g., Celery, Kafka, SQS), and comfort working in cloud environments like AWS with containers, Kubernetes, and CI/CD pipelines.
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. AI Engineer, Customer Agent About the Role At Klaviyo, we believe the future of software lies not only in tools that help people work more efficiently, but in intelligent systems that can take action, learn from outcomes, and improve customer experiences over time. Klaviyo serves more than 167,000 customers and processes billions of consumer profiles, messages, interactions, and conversion signals. This creates a unique opportunity to build state-of-the-art AI systems that help businesses create and execute better customer experiences at scale. We’re looking for an AI Engineer to join the Customer Agent team, Klaviyo’s AI-native conversational platform. You’ll help build scalable backend systems and AI-powered product experiences that enable agents to retrieve context, use tools, and take reliable action on behalf of customers. This is a backend-heavy role with opportunities to contribute to user-facing experiences . You’ll independently own meaningful pieces of larger systems, contribute to technical decisions, and continue developing your depth across backend engineering, applied AI, and production reliability. How You Will Make a Difference Build and improve reliable backend systems and APIs that power AI-driven customer experiences. Develop production agentic features involving tool use, context management, retrieval, structured outputs, orchestration, and multi-step workflows. Contribute to solving applied AI problems across retrieval and RAG, grounding, hallucination mitigation, model selection, and choosing between LLM-based, deterministic, or hybrid approaches. Build and use evaluation approaches including representative datasets, automated and human evaluation, regression testing, qualitative error analysis, and production signals. Improve system reliability through guardrails, retries, fallbacks, observability, monitoring, and thoughtful failure handling. Build asynchronous and distributed processing workflows that support AI workloads at scale. Participate in an on-call rotation and help diagnose, mitigate, and learn from production incidents. Work with external customers and cross-functional partners to understand workflows, identify pain points, and translate feedback into product improvements. Monitor shipped experiences and use quality metrics, system performance, and customer feedback to guide iteration. Who You Are You have 3+ years of professional software engineering experience , with experience building backend systems or distributed applications. You have hands-on experience building or contributing to generative AI or agentic AI applications , ideally used by real users or in production environments. You are proficient in Python and have experience with modern backend frameworks such as FastAPI or Django. You have experience with asynchronous processing or distributed task/event systems such as Celery, Kafka, SQS, RabbitMQ, or Redis. You have working knowledge of databases, data modeling, APIs, and persistence patterns used in production systems. You are comfortable working in cloud environments and have experience with technologies such as AWS, containers, Kubernetes, infrastructure automation, or CI/CD systems. You can reason about tradeoffs among quality, latency, cost, reliability, and implementation complexity, and know when to seek additional technical context. You are comfortable working through ambiguity, breaking larger problems into smaller pieces, and making progress without every requirement being fully specified. You have experience with, or strong interest in, working directly with external customers to understand problems and improve products. You care about shipping useful, reliable products and are motivated to deepen your engineering judgment in a rapidly evolving technical space. Nice to Have Experience training, fine-tuning, distilling, or otherwise adapting machine learning or language models. Experience with reinforcement learning or feedback-driven optimization. Experience with evaluation infrastructure such as LLM-as-judge systems, evaluator calibration, benchmark datasets, or AI quality tooling. Experience operating AI systems at meaningful production scale or optimizing inference cost, latency, or throughput. #indeedRD - 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 penal
| Role | AI Engineer II |
|---|---|
| Company | Klaviyo |
| Location | Boston, MA |
| Type | full-time |
| Compensation | Not disclosed |
| Posted | 2026-10-07 |
| Deadline | Rolling |
Typical process for this type of role
A general guide — the exact steps for this specific listing may vary; check the original posting for details.
- 1ApplicationSubmit your resume through the apply link.
- 2ScreeningRecruiter reviews your background against the role.
- 3AssessmentA technical test, assignment, or coding round, depending on the role.
- 4Interview(s)One or more rounds with the hiring team.
- 5OfferOffer letter with compensation and start date.
Before you apply
0/4About Klaviyo
Klaviyo, Inc. is an AI-first B2C CRM platform founded in 2012 and headquartered in Boston. The company provides a unified solution that integrates marketing automation, customer service, analytics, and a data platform to help businesses manage customer relationships. By centralizing behavioral, transactional, and engagement data, Klaviyo enables brands to deliver personalized, omnichannel campaigns across email, SMS, WhatsApp, and mobile push notifications. The platform utilizes AI agents to automate marketing tasks, resolve customer service inquiries, and optimize campaign performance. Klaviyo currently serves over 205,000 brands across more than 100 countries, processing billions of events and managing billions of customer profiles daily to support business growth.
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