Klaviyo unifies AI-powered email marketing and SMS to drive growth, retention, and measurable results. Build personalized, omnichannel experiences across WhatsApp, ecommerce, and more with K:AI Agents. Backed by Accel.
About the role
At Klaviyo, we believe the future of software isn’t just better productivity tools for humans—it’s intelligent systems that can run, optimize, and adapt themselves based on real-time outcome and reward signals. Found on 1752vc Careers, the job board for startup and VC roles.
What they're looking for
- Experienced Backend Leader: 8+ years of professional software engineering experience centered on distributed systems, microservices architecture, and high-availability backend platform ownership
- Distributed Systems Specialist: Proven track record of architecting event-driven architectures, asynchronous processing pipelines, and message queues (e.g., Kafka, Celery, SQS, Redis) for heavy throughput workloads
- Python & Tooling Mastery: Deep proficiency in Python and modern frameworks (FastAPI, Django) alongside experience with data processing platforms and object-relational mapping tools
- Cloud Infrastructure Native: Strong expertise with AWS, Kubernetes, CI/CD automation, and modern observability suites, integrating cloud architecture seamlessly into system design
- Quality & Evals Focused: Experience establishing automated evaluation frameworks for AI models, balancing latency, accuracy, cost, and safety in production environments
- Cross-Functional Influencer: A technical leader who elevates team performance through architectural direction, collaborative problem-solving, and clear communication across engineering and business domains
More about this role
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.
Job Title: Sr. Lead Software Engineer
This role is based in our Boston hub. We operate a hub‑first model, with regular in‑office collaboration expected.
At Klaviyo, we believe the future of software isn’t just better productivity tools for humans—it’s intelligent systems that can run, optimize, and adapt themselves based on real-time outcome and reward signals. Having already built the infrastructure and applications that connect businesses with over 200,000 customers, billions of consumer profiles, and hundreds of billions of interaction events, we are now making foundational investments in Marketing AI and Service AI to power next-generation agentic...
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