Senior Software Engineer II Messaging Core

Job Description

At HubSpot, we’re on a mission to help millions of organizations grow better. Our platform is used by businesses worldwide to manage their marketing, sales, service and operations — and under the hood, our product is built to be flexible, secure and empowering for both our customers and our own engineering teams. We believe in autonomy, curiosity and building a workplace where everyone can thrive.

Meet the team: Messaging Core (Messaging Product Group)

The Messaging Product Group builds the apps and infrastructure behind marketing Email, SMS and WhatsApp in HubSpot. We work at a serious scale, powering billions of messages per month. We focus on building reliable systems while continuously innovating the product to help our customers achieve better outcomes.

Messaging Core Backend builds the foundation that every Messaging product depends on. As a Senior Software Engineer II, you’ll build the backend systems that make asset creation, publishing and cross-product consistency possible, enabling other Messaging teams to ship quickly on top of a reliable, well-defined platform. You’ll design and evolve distributed systems at scale, tackle complex reliability and data challenges and shape core architecture used across Messaging.

What You’ll Do

• Design and build backend services and APIs for marketing Email, SMS and WhatsApp creation, management and publishing.
• Own and evolve shared infrastructure used across Messaging.
• Lead complex, cross-team projects (typically 3–6 months) that span multiple services, data stores and product areas.
• Take a data-driven approach to reliability and performance.
• Contribute to and sometimes lead database and infrastructure initiatives, such as keyspace migrations in partnership with platform teams.
• Debug and resolve production issues across the stack: work with tooling like Metrics, Logfetch, Error Reporting and Tracing and use incident learnings to improve architecture, alerting and runbooks.
• Drive technical design for new features and refactors: write design docs, review peers’ designs and ensure solutions are scalable, maintainable and aligned with the broader Messaging architecture.
• Mentor and level up other engineers on the team via code reviews, pairing and informal coaching, helping them deepen their skills in distributed systems, reliability and product thinking.
• Collaborate closely with frontend, infra and product partners across Messaging and adjacent teams to deliver cohesive, end‑to‑end solutions.
• Participate in on‑call rotations and incident response, contributing to a culture of shared ownership for reliability and sustainable on‑call practices.

What You’ll Bring

• Deep backend engineering experience (typically 5+ years) building and operating production services in a modern microservice environment (e.g. JVM stack, relational databases, event-driven architectures).
• A track record of leading complex projects (3–6 months) as the primary backend engineer: you’ve owned design, implementation, rollout and long‑term maintenance for systems with real customer and business impact.
• Strong system design skills. You can design and evolve fault-tolerant, horizontally scalable systems, make pragmatic trade‑offs between short and long‑term needs and keep solutions simple where possible.
• Experience maintaining, implementing and improving service maturity (latency, test coverage, fault tolerance, reliability).
• Comfort working in high‑impact, data‑sensitive systems, including schema changes, migrations and performance-sensitive paths touching key tables and services in Messaging and Content.
• Excellent collaboration and communication skills across engineering, product and support. Especially when clarifying ownership, triaging issues and aligning on behavior across multiple teams.
• A growth mindset and evidence of multiplicative impact through mentoring others, improving shared libraries or shaping patterns that other teams adopt.

Nice to Have

• Experience in messaging or marketing technology (email/SMS/WhatsApp sending, campaign management, compliance, or analytics).
• Familiarity with MySQL/Vitess and large‑scale data migrations in a sharded environment.
• Background working with CRM objects, properties and usage data, ideally including mirroring content into CRM and managing usage/ownership boundaries.
• Experience with service maturity programs, error budgets and SLO‑driven reliability work within a larger product line.
• Comfort collaborating with frontend teams to design robust contracts and APIs and with infra/platform teams on migrations and tooling improvements.

We know the confidence gap and impostor syndrome can get in the way of meeting spectacular candidates, so please don’t hesitate to apply — we’d 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 you’re 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, you’ll 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 HubSpot’s Career Diversity page here.

India Applicants: link to HubSpot India’s 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. HubSpot’s 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.

We’re 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.

Explore more:

• HubSpot Careers
• Life at HubSpot on Instagram

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