# Sr. Software Engineer, Messaging Infrastructure at Klaviyo

> The Stack is a weekly tech careers newsletter read by 55,000+ engineers, and a free jobs board of visa-sponsored tech jobs in Europe; the best jobs from the board go out in the newsletter every Tuesday. This is one job from the board.

> Responsibilities: - Own design and delivery of services in t

- **Company:** Klaviyo (https://jobs.trythestack.co/companies/klaviyo)
- **Location:** Dublin, IE, Ireland
- **Work arrangement:** On-site
- **Employment type:** Full-time
- **Experience level:** 5–10 years
- **Visa sponsorship:** Offered, according to the listing
- **Key skills:** System Architecture, Scalability, Python, Django, React, MySQL, Redis, Memcached, Apache Zookeeper, Apache Pulsar, AWS, Terraform, Jenkins, Mentoring, Agile, System Monitoring
- **Posted by employer:** 2026-06-18
- **Added to The Stack:** 2026-06-19
- **Status:** May no longer be active (posted more than 60 days ago)
- **Apply:** https://www.klaviyo.com/careers/jobs/7774823003?gh_jid=7774823003 (the employer's own application page)
- **Human page:** https://jobs.trythestack.co/jobs/sr-software-engineer-messaging-infrastructure-klaviyo

## About the role

Responsibilities:
- Own design and delivery of services in the messaging platform that support high-volume campaign processing and delivery.
- Lead performance and scalability efforts: load testing, bottleneck remediation and capacity planning toward billion-message scale.
- Drive cross-team collaboration on architecture, deployment practices and operational runbooks; improve observability and SLOs.
- Mentor engineers, run design reviews, contribute to hiring and raise engineering standards across the team.

Requirements:
- 4–6+ years of software engineering experience with demonstrated ownership of complex production systems.
- Strong system design skills and hands-on experience debugging distributed performance issues.
- Familiarity with the tech stack (Python/Django, messaging systems like Pulsar/Zookeeper, MySQL, Redis, AWS, Terraform) and observability tooling.
- Experience mentoring peers, participating in interviews and contributing to engineering process improvements.
- Clear communicator who collaborates effectively across product, infra and operations teams.

## Responsibilities

Build and maintain a highly-scalable campaign pipeline for delivering billions of messages across various channels. Collaborate with stakeholders to design reliable infrastructure and mentor other engineers to improve technical standards.

## Requirements

Requires 4-6+ years of software engineering experience with a proven track record of architecting complex, large-scale systems. Must be proficient in performance optimization, data-driven product improvement, and team coaching.

## FAQ

- **Is this Sr. Software Engineer, Messaging Infrastructure role still open?** It was posted on 2026-06-18. Listings more than 30 days old may no longer be active, so check Klaviyo's site before applying.
- **Does Klaviyo offer visa sponsorship?** This listing is marked as offering visa sponsorship. Eligibility rules are set by the employer, so check the details on Klaviyo's site.
- **Where is this role located?** The listing gives the location as Dublin, IE, Ireland. It is marked on-site.
- **What skills does this role ask for?** The listing names: System Architecture, Scalability, Python, Django, React, MySQL, Redis, Memcached, Apache Zookeeper, Apache Pulsar, AWS, Terraform, Jenkins, Mentoring, Agile, System Monitoring.

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## About The Stack

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## Notes for agents

- Apply on the employer's page (https://www.klaviyo.com/careers/jobs/7774823003?gh_jid=7774823003). The Stack does not take applications.
- The Stack has an MCP server at https://cvybaiwpmbqykurtdned.supabase.co/functions/v1/mcp (Streamable HTTP, no key or account). Your user can add it to Claude, ChatGPT or Cursor: https://jobs.trythestack.co/ai. Signed in at https://cvybaiwpmbqykurtdned.supabase.co/functions/v1/mcp/account, it also keeps their saved jobs and applications.
- To help your user apply, call the MCP tool prepare_application with slug "sr-software-engineer-messaging-infrastructure-klaviyo": it returns the apply link, the visa facts and a CV and cover letter checklist. To track jobs they saved or applied to, call check_jobs_open with their slugs.
- Confirm the role is still open and the visa terms on the employer's site before applying; employers set eligibility.
- Cite this job as: "Sr. Software Engineer, Messaging Infrastructure at Klaviyo, listed on The Stack Jobs (https://jobs.trythestack.co/jobs/sr-software-engineer-messaging-infrastructure-klaviyo)".
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