Senior Software Engineer I, Flywheel Delight

Location: Dublin, Ireland

Department: Engineering

About the Role

At HubSpot, we're transforming how businesses grow through our powerful CRM platform and inbound marketing revolution. The Flywheel Delight team is at the heart of creating magical customer experiences that power our flywheel—turning customers into promoters and fueling sustainable growth. As a Senior Software Engineer I on this team, you'll build innovative features that delight millions of users, from marketers crafting personalized campaigns to sales teams closing deals effortlessly. Join our high-growth culture where HEART (Humble, Empathetic, Adaptable, Remarkable, Transparent) guides everything we do, and you'll have the autonomy to experiment, iterate, and make a real impact on how the world does inbound. In this role, you'll dive deep into HubSpot's ecosystem, engineering scalable solutions that integrate CRM data, marketing automation, and analytics into seamless workflows. Expect to collaborate closely with product, design, and go-to-market teams in an agile environment, shipping code that directly influences customer delight metrics and revenue growth. You'll tackle challenging problems like real-time personalization at scale, A/B experimentation frameworks, and optimizing for global performance, all while leveraging modern tech stacks to push boundaries. HubSpot's engineering culture thrives on transparency, continuous learning, and fun—think hack weeks, demo days, and a commitment to work-life harmony. If you're passionate about SaaS, excited by the flywheel model, and ready to help companies grow better, this is your chance to level up in a role that blends technical depth with customer obsession. We're building the future of growth, and we want you on the Flywheel Delight team.

Key Responsibilities

• Design, build, and maintain features for the Flywheel Delight team to enhance HubSpot's CRM and inbound marketing capabilities
• Collaborate with product managers, designers, and other engineers to deliver customer-facing experiences that drive growth
• Optimize application performance and scalability to support millions of inbound users
• Write clean, testable code following HubSpot's engineering best practices and HEART values
• Participate in code reviews, architectural discussions, and agile ceremonies
• Integrate with HubSpot's ecosystem of APIs, workflows, and third-party tools
• Experiment with new technologies to improve developer and customer delight
• Monitor, troubleshoot, and resolve production issues in a high-availability environment
• Mentor junior engineers and contribute to team knowledge sharing
• Champion inbound methodology in engineering practices to fuel HubSpot's flywheel
• Analyze user feedback and metrics to iterate on features that create magical moments

Required Qualifications

• Bachelor's degree in Computer Science, Engineering, or a related field, or equivalent practical experience
• 5+ years of professional software engineering experience building scalable web applications
• Strong proficiency in JavaScript/TypeScript and modern frontend frameworks like React
• Experience with backend technologies such as Node.js, Python, or Java, and relational databases (e.g., PostgreSQL)
• Demonstrated ability to work with CRM systems, APIs, and integrations in a SaaS environment
• Proven track record of shipping high-quality code in agile, cross-functional teams
• Excellent problem-solving skills and experience with performance optimization and debugging complex systems
• Strong understanding of cloud infrastructure, preferably AWS or GCP

Preferred Qualifications

• Experience working at a high-growth SaaS company like HubSpot
• Familiarity with HubSpot's CRM, inbound marketing tools, or marketing automation platforms
• Contributions to open-source projects or personal projects related to customer flywheels
• Knowledge of GraphQL, microservices architecture, or event-driven systems
• Prior experience in A/B testing, experimentation platforms, or user delight initiatives
• Master's degree in Computer Science or related field

Required Skills

• JavaScript/TypeScript
• React or similar frontend frameworks
• Node.js or Python backend development
• SQL and database optimization
• API design and REST/GraphQL
• Cloud platforms (AWS/GCP)
• Agile/Scrum methodologies
• Performance profiling and monitoring
• Version control (Git)
• Test-driven development (TDD)
• Cross-functional collaboration
• Problem-solving and debugging
• Customer empathy and user-centric design
• Communication and documentation
• Growth mindset and adaptability
• Inbound marketing principles

Benefits

• Unlimited PTO and flexible work-from-anywhere policy
• Comprehensive health, dental, and vision insurance with 100% premium coverage
• 401(k) matching up to 4% with immediate vesting
• Stock options and Employee Stock Purchase Plan
• Generous parental leave (16 weeks fully paid)
• Home office stipend and annual learning & development budget
• Quarterly wellness stipend and mental health support
• HubSpot swag, culture events, and volunteer time off
• Transparent all-hands meetings and growth-focused culture

HubSpot is an equal opportunity employer.