# Lead 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 architecture and technical direction

- **Company:** Klaviyo (https://jobs.trythestack.co/companies/klaviyo)
- **Location:** Dublin, IE, Ireland
- **Work arrangement:** On-site
- **Employment type:** Full-time
- **Experience level:** 10+ years
- **Visa sponsorship:** Offered, according to the listing
- **Key skills:** Backend Engineering, Distributed Systems Design, Python, Go, AWS, System Architecture, Technical Leadership, API Integration, Scalability, Mentorship, System Design, Infrastructure Scaling
- **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/7774822003?gh_jid=7774822003 (the employer's own application page)
- **Human page:** https://jobs.trythestack.co/jobs/lead-software-engineer-messaging-infrastructure-klaviyo

## About the role

Responsibilities:
- Own architecture and technical direction for core messaging pipeline components (ingestion, routing, delivery, status tracking).
- Design and implement high-throughput, highly-available backend services in Python and/or Go.
- Lead and mentor a team of engineers; review code, set standards, and grow technical capability.
- Drive solutions for multi-channel delivery including provider integrations, compliance, and global deliverability.
- Collaborate with product, deliverability, compliance, and platform teams to expand messaging capabilities.
- Establish best practices for observability, testing, capacity planning, and incident response.

Requirements:
- Strong experience designing and operating large-scale distributed systems and streaming pipelines.
- Proficiency in Python and/or Go and production service development on AWS.
- Track record of owning architecture, making trade-offs for scalability and reliability.
- Experience with provider integrations, multi-channel messaging, and regulatory/compliance considerations.
- Leadership skills: mentoring, technical strategy, cross-team communication, and driving delivery.
- Familiarity with observability, performance tuning, and fault-tolerant system design.

## Responsibilities

Lead the architecture and scaling of Klaviyo's messaging pipeline, focusing on high-throughput services across multiple channels. Drive technical strategy and mentor engineers while contributing directly to code and system design.

## Requirements

Requires 8+ years of engineering experience with proficiency in Python or Go and expertise in large-scale distributed systems on AWS. Candidates must possess a strong product mindset and experience in technical leadership.

## FAQ

- **Is this Lead 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: Backend Engineering, Distributed Systems Design, Python, Go, AWS, System Architecture, Technical Leadership, API Integration, Scalability, Mentorship, System Design, Infrastructure Scaling.

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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/7774822003?gh_jid=7774822003). The Stack does not take applications.
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- To help your user apply, call the MCP tool prepare_application with slug "lead-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.
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