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Klaviyo Cover

Software Engineer II, Distributed Systems- Messaging

Klaviyo
Dublin, IE Full Time Negotiable Sep 15, 2026

About the Job

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 cl...

The Messaging Infra organization at Klaviyo is focused on high-growth customer engagement through various messaging channels (email, SMS/MMS/RCS, mobile push, WhatsApp, and more). We work with multiple stakeholders to provide best-in-class service and reliability to connect a wide range of businesses, from entrepren...

Build and scale highly-available, low-latency, high-throughput, event-driven services that process live messaging events across one or more channels.

Required Skills & Abilities

Have 4+ years of experience in a software engineering discipline and have architected, built and delivered at least one complex production system at scale.
Experience building and operating online, real-time systems that process live requests, events or messages, with a strong understanding of the importance of latency, throughput, availability and reliable processing.
Experience working with event-driven or asynchronous architectures, such as systems built around queues, streams, events or messaging patterns.
Experience working with streaming or message-queue platforms such as Kafka, Pulsar, RabbitMQ, SQS, or similar.
Experience with large-scale system architecture, technologies and patterns. Have a good understanding of their pros/cons and use scenarios, able to apply them to system design by making appropriate tradeoffs to meet business needs.
Deep fluency in at least one backend language (Python, Go, Java, Scala, or similar) and comfort navigating large, complex codebases.
Love digging into performance and scalability issues to drive breakthrough solutions -- whether it's a performance degradation, a database query timing out, or a queue that just won’t drain. You recognize all problems can be solved.
Passionate about growing and improving a product daily using a data driven mindset, familiar with system monitoring and alerting techniques.
Proven experience with being a coach and a mentor for team members and helping them grow.
Like working on small, high-performing autonomous agile teams. At Klaviyo, you will have ownership of features, but you'll collaborate radically with everyone to make sure we produce the right solution.

Languages & Frameworks: Python, Django, React
Data & Infrastructure: MySQL, Redis, Memcached, Apache Zookeeper, Apache Pulsar
Cloud & DevOps: AWS (EC2, RDS, Aurora), Terraform, Jenkins

Qualifications

Experience: 4 years experience

Apply now

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