Lead Software Engineer, Messaging Infrastructure at Klaviyo

✨ The Stack take on this Klaviyo job

• 🏢 Klaviyo has 19 jobs here, 11 with visa sponsorship see all
• 🛂 Visa: Critical Skills Employment Permit. Occupations on the Critical Skills list: €40,904 a year with a relevant degree guide
• 💡 No salary shown. Ask Klaviyo if it is above the minimum.

Updated 2026-11-05, from our data and official sources.

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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.

Key skills

• Backend Engineering — in 127 other listings on The Stack
• Distributed Systems Design — in 1 other listing on The Stack
• Python — in 1200 other listings on The Stack
• Go — in 230 other listings on The Stack
• AWS — in 802 other listings on The Stack
• System Architecture — in 171 other listings on The Stack
• Technical Leadership — in 133 other listings on The Stack
• API Integration — in 97 other listings on The Stack
• Scalability
• Mentorship
• System Design
• Infrastructure Scaling

On The Stack (as of 2026-11-05)

• Klaviyo has 18 other listings on The Stack, 10 of them marked as offering visa sponsorship.
• 37 visa-sponsored jobs in Ireland on The Stack, posted in the last 60 days.
• 195 visa-sponsored software engineer jobs in Europe on The Stack, posted in the last 60 days.

Frequently asked questions about Klaviyo

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.