Lead Software Engineer, Messaging Infrastructure

United States Digital Space LLC; Dublin; Hybrid; EUR 112,000 - 168,000; Full time

Job summary

the company, based in Dublin, Ireland, is seeking a Lead Software Engineer for its Messaging Infra team. You will provide technical leadership, own components of the messaging pipeline, and work across multi-channel delivery.

You will design scalable backend services in Python and/or Go, mentor engineers, and drive architecture, reliability, and AI-enabled improvements while collaborating with product, compliance, and platform teams.

Qualifications

• 8+ years of engineering experience with backend and distributed systems design.
• Proficient in Python and/or Go.
• Experienced with large-scale system architecture — familiar with tradeoffs under real constraints.
• Comfortable contributing to architecture and code directly; hands-on role.
• Skilled in scaling infrastructure on AWS.
• Strong product and business mindset — understand customer impact.

Responsibilities

• Own architecture of key components in the messaging pipeline—from ingestion to delivery and status tracking.
• Lead a team of engineers building and scaling highly-available, high-throughput services across one or more messaging channels.
• Design and implement scalable backend services in Python and/or Go.
• Work on a campaign pipeline that processes hundreds of millions of messages daily, scaling to billions.
• Collaborate across product, deliverability, compliance, and platform teams to expand messaging capabilities.
• Drive best practices in system design, code quality, and engineering process across your team.
• Mentor and grow engineers, elevating the overall Messaging Infra organization.

Skills

Backend design

Python

Go

Distributed systems

AWS

Architecture

Mentorship

Code reviews

Cross-functional collaboration

Tools

Django

React

MySQL

Redis

Memcached

Apache Zookeeper

Apache Pulsar

Job description

At the company, we value the unique backgrounds, experiences and perspectives each the company (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 close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at the company? Visit the company.com/careersto see how we empower creators to own their own destiny.

About the company

the company is a leading marketing automation platform that helps businesses grow by delivering personalized experiences. Our mission is to empower creators to own their destiny. We believe in providing an exceptional developer experience that enables our engineering teams to build and ship high-quality software efficiently and with confidence.

About the Team

The Messaging Infra organization at the company 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 entrepreneurs to enterprises, with their end users. The messaging platform is a mission-critical system, responsible for delivering billions of messages, and must be architected for massive scale and reliability.

As a Lead Software Engineer in the Messaging Infrastructure organization, you'll provide technical leadership to a group of engineers building and scaling the services that power the company's messaging pipeline end-to-end. You'll drive technical strategy, own critical components of the delivery infrastructure, and help the team navigate the unique challenges of multi-channel compliance, regulatory requirements, provider integrations, and global deliverability. This is a hands‑on technical leadership role where you'll contribute to architecture, code, and mentorship while shaping the future of messaging at the company.

How you will make a difference

• Own and drive the architecture of key components in the company's messaging pipeline — from ingestion and routing through to delivery and status tracking
• Lead a team of engineers building and scaling highly-available, high-throughput services across one or more messaging channels
• Design and implement scalable backend services in Python and/or Go
• Work on a campaign pipeline that processes and delivers hundreds of millions of messages daily, growing to billions-scale
• Bring clarity to ambiguous technical problems — breaking undefined challenges into concrete, actionable plans
• Collaborate across product, deliverability, compliance, and platform teams to expand messaging capabilities
• Drive best practices in system design, code quality, and engineering process across your team
• Mentor and grow engineers, contributing to a high bar across the broader Messaging Infra organization
• Build smarter systems and workflows by putting AI at the center of how you and your team work

Who you are

• 8+ years of engineering experience with strong backend and distributed systems design skills
• Proficient in Python and/or Go, and able to pick up the other quickly
• Experienced with large-scale system architecture — familiar with the tradeoffs involved and able to apply them against real business constraints
• Comfortable contributing to architecture and code directly; this is a hands‑on role
• Skilled in scaling infrastructure on AWS
• Strong product and business mindset — you think beyond the code to understand customer impact
• Self‑directed and delivery‑focused — you ship incremental value and iterate
• Clear communicator who thrives in a high-autonomy, cross‑functional environment
• You’ve already experimented with AI in your work or personal projects and are excited to keep pushing on that

Technologies we use (not exhaustive):

Languages & Frameworks: Python, Django, React

Data & Infrastructure: MySQL, Redis, Memcached, Apache Zookeeper, Apache Pulsar

Cloud & DevOps: AWS (EC2, RDS, Aurora), Terraform, Jenkins

Location & Work Model:

This role is based in Dublin, Ireland and follows a hybrid working model. the company supports work authorization and relocation for this position.

At the company, we enjoy tackling meaningful engineering challenges and value people who take ownership, learn continuously, and collaborate openly. We are committed to building inclusive teams and encourage applications from candidates of all backgrounds.

the company is growing fast and we have openings for all skill levels across all of our teams. Learn more about our engineering culture at https://the company.tech

Our salary range reflects the cost of labour in the country where the job post is advertised. The base salary offered for this position is determined by several factors, including the applicant’s job‑related skills, relevant experience, education or training, and work location.

In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign‑on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility.

Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process.

Base Pay Range in Local Currency:

€112.000—€168.000 EUR

This role may require up to 10% travel for purposes such as new hire onboarding, client or partner work if applicable, team meetings, and industry events. Travel is coordinated in advance.

Get to Know the company

We’re the company (pronounced clay-vee-oh). We empower creators to own their destiny by making first‑party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us.

AI fluency at the company includes responsible use of AI (including privacy, security, bias awareness, and human‑in‑the‑loop). We provide accommodations as needed.

By participating in the company’s interview process, you acknowledge that you have read, understood, and will adhere to our