# Software Engineer II, 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: - Design, build and operate features of a

- **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/7774824003?gh_jid=7774824003 (the employer's own application page)
- **Human page:** https://jobs.trythestack.co/jobs/software-engineer-ii-messaging-infrastructure-klaviyo

## About the role

Responsibilities:
- Design, build and operate features of a high-throughput messaging pipeline that processes campaign traffic at scale.
- Implement reliable, highly-available components for message processing, delivery and retry logic across channels (email, SMS, push, etc.).
- Collaborate with product, infra and cross-functional teams to define designs, perform load testing and ship production changes safely.
- Diagnose and resolve performance, scaling and reliability issues; improve monitoring and alerting for key flows.
- Mentor peers, contribute to technical reviews and participate in hiring/interviewing to maintain team quality.

Requirements:
- 4+ years software engineering experience with ownership of at least one complex, production system.
- Strong fundamentals in large-scale system design, performance tuning and trade-offs for availability and cost.
- Experience with relevant stack components (Python/Django, message systems like Pulsar, MySQL, Redis, AWS and Terraform preferred).
- Comfortable debugging distributed systems, writing tests and improving deployment/experiment workflows.
- Good communication skills, collaborative mindset and willingness to mentor others.

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

## FAQ

- **Is this Software Engineer II, 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/7774824003?gh_jid=7774824003). 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 "software-engineer-ii-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: "Software Engineer II, Messaging Infrastructure at Klaviyo, listed on The Stack Jobs (https://jobs.trythestack.co/jobs/software-engineer-ii-messaging-infrastructure-klaviyo)".
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