Senior Software Engineer II, Messaging Platform

London - UK

Monthly Salary: Not Disclosed

Posted on: 11 hours ago

Vacancies: 1 Vacancy

Job Summary

POS-30032

About the Messaging Platform Group

HubSpots Messaging Platform Group develops the core infrastructure that supports communication across all HubSpot products. Every messagewhether from a marketing campaign a personalized sales email a service alert or an automated workflowgoes through the systems our team creates.

Our systems handle enormous scale: we send over 8 billion emails SMS and WhatsApp messages each month record billions of events and enable customers to link their personal inboxes directly to the HubSpot CRM. For us reliability security and deliverability are non-negotiabletheyre essential for maintaining customer trust and ensuring business success.

We continuously push the limits of large-scale messaging by developing intelligent routing improving our custom mail transfer agent (MTA) expanding our IP network and optimizing overall deliverability to ensure every message reaches its destination.

About the Email Sending Infrastructure Team

The Email Sending Infrastructure team manages the core backend systems that ensure reliable email sending and receiving across HubSpot. They develop and operate HubSpots in-house mail transfer agent (MTA) and oversee a globally distributed network of email sending IPs supporting billions of messages addition to just sending emails they design smart routing systems that control message flow through our infrastructure guaranteeing safe efficient and large-scale delivery.

To maintain this ecosystem the team creates tools and services that constantly monitor network performance reputation and deliverability. They emphasize observability resilience and control giving HubSpot and its customers confidence that messages arrive on time and where needed. Their work combining distributed systems networking and performance engineering forms the foundation of how customers communicate and grow with HubSpot.

What Youll Do

As a Senior Backend Engineer on the Email Sending Infrastructure team you will:

Design build and maintain high-scale backend services that support email sending routing and deliverability across the HubSpot platform.
Contribute to the development of HubSpots in-house MTA and systems managing global IP networks.
Enhance reliability observability and performance within a mission-critical messaging pipeline.
Collaborate closely with infrastructure teams product managers and deliverability experts to ensure safe consistent high-quality message delivery.
Lead design discussions participate in architectural decisions and help shape long-term technical strategy.
Write clean testable and maintainable code that follows best practices for distributed systems and network-intensive workloads.
Engage in code reviews mentor fellow engineers and foster a culture of learning and operational excellence.

Were Looking For Someone Who:

Has 7 years of backend engineering experience working on highly available scalable systems.
Is comfortable working with technologies like Java Kotlin MySQL Kafka HBase and Kubernetes (experience with specific stacks is less important than strong fundamentals).
Understands distributed systems networked services and high-throughput data flows.
Enjoys solving complex reliability throughput and performance challenges.
Communicates clearly and collaborates effectively with engineers PMs designers and domain experts.
Builds with empathy for the end userand for the downstream teams who build on our infrastructure.
Thrives in an environment where curiosity pragmatism and resourcefulness drive impact.

Why This Role Matters

Email is one of the most critical and widely used communication channels at HubSpot and the infrastructure supporting it directly impacts how our customers do business. The systems you build and maintain in this role will power the sending of billions of messages each month enabling companies of all sizes to reach their audiences nurture relationships and drive revenue. Your work will influence deliverability latency reliability and trustfactors that determine whether our customers messages land in inboxes or disappear into the void.

By strengthening HubSpots email infrastructure you help safeguard our global sending reputation and enable us to grow safely as our customer base and message volume expand. The features you develop will lay a foundation not only for email but also for future messaging channels and intelligent routing options across the platform. Ultimately this role influences how effective reliable and powerful HubSpots messaging experience is for millions of users worldwide.

We know the confidence gapand impostor syndrome can get in the way of meeting spectacular candidates so please dont hesitate to apply wed love to hear from you.

If you need accommodations or assistance due to a disability please reach out to us using this form.

At HubSpot we value both flexibility and connection. Whether youre a Remote employee or work from the Office we want you to start your journey here by building strong connections with your team and peers. If you are joining our Engineering team you will be required to attend a regional HubSpot office for in-person onboarding. If you join our broader Product team youll also attend other in-person events such as your Product Group Summit and other gatherings to continue building on those connections.

If you require an accommodation due to travel limitations or other reasons please inform your recruiter during the hiring process. We are committed to supporting candidates who may need alternative arrangements

Massachusetts Applicants: It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.

Germany Applicants: (m/f/d) - link to HubSpots Career Diversitypagehere.

India Applicants: link to HubSpot Indias equal opportunity policy here.

About HubSpot

HubSpot (NYSE: HUBS) is an AI-powered customer platform with all the software integrations and resources customers need to connect marketing sales and service. HubSpots connected platform enables businesses to grow faster by focusing on what matters most: customers.

At HubSpot bold is our baseline. Our employees around the globe move fast stay customer-obsessed and win together. Our culture is grounded in four commitments: Solve for the Customer Be Bold Learn Fast Align Adapt & Go! and Deliver with HEART. These commitments shape how we work lead and grow.

Were building a company where people can do their best work. We focus on brilliant work not badge swipes. By combining clarity ownership and trust we create space for big thinking and meaningful progress. And we know that when our employees grow our customers do too.

Recognized globally for our award-winning culture by Comparably Glassdoor Fortune and more HubSpot is headquartered in Cambridge MA with employees and offices around the world.

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Required Experience:

Senior IC

POS-30032About the Messaging Platform GroupHubSpots Messaging Platform Group develops the core infrastructure that supports communication across all HubSpot products. Every messagewhether from a marketing campaign a personalized sales email a service alert or an automated workflowgoes through the sy...