Senior Software Engineer I, Flywheel Delight

Location: Remote - United Kingdom

Department: Engineering

About the Role

At HubSpot, we're transforming the way businesses grow through our powerful CRM platform and inbound methodology. The Flywheel Delight team is at the heart of this mission, focused on creating magical experiences that turn customers into promoters and fuel our flywheel. As a Senior Software Engineer I on Flywheel Delight, you'll build features that delight users from onboarding to advocacy, leveraging HubSpot's all-in-one platform for marketing, sales, service, and operations. Join our engineering team in Cambridge, MA (or remote) to ship products loved by millions, in a culture that embodies growth, transparency, and HEART. In this role, you'll own end-to-end development of customer-facing features, collaborating closely with PMs, designers, and fellow engineers to enhance the Flywheel—our model for sustainable business growth. Expect to dive into React-based UIs, robust backend services, and CRM integrations that power inbound strategies. You'll tackle challenges like personalizing user journeys, optimizing flywheel momentum through data-driven insights, and ensuring seamless experiences across HubSpot's ecosystem. Our agile environment means frequent iterations, A/B testing, and direct impact on customer delight metrics. HubSpot's growth culture thrives on innovation, inclusivity, and bold thinking. You'll mentor peers, contribute to open discussions, and grow alongside a world-class team passionate about inbound. With unlimited PTO, stock options, and endless learning opportunities via HubSpot Academy, this is your chance to engineer the future of customer success. If you're excited to make work-life flywheel-powered, apply now!

Key Responsibilities

• Design, build, and maintain scalable features for HubSpot's Flywheel Delight team, enhancing customer onboarding and retention
• Collaborate with product managers, designers, and other engineers to deliver delightful user experiences in our CRM platform
• Develop and integrate APIs to power inbound marketing tools and seamless customer data flows
• Write clean, testable code following HubSpot's engineering best practices and HEART values
• Optimize application performance and scalability to support millions of inbound users
• Participate in code reviews, debugging, and continuous improvement of the Flywheel codebase
• Experiment with A/B tests and data-driven iterations to boost customer delight and growth metrics
• Mentor junior engineers and contribute to team knowledge sharing in our growth culture
• Stay ahead of industry trends in CRM, marketing automation, and web technologies
• Work cross-functionally to align engineering efforts with HubSpot's inbound methodology and flywheel model
• Ensure security, reliability, and compliance in all developed features

Required Qualifications

• Bachelor's degree in Computer Science, Software 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 ability to thrive in a fast-paced, growth-oriented culture
• Strong communication skills with experience collaborating with product managers, designers, and other engineers

Preferred Qualifications

• Experience working at a high-growth SaaS company like HubSpot
• Familiarity with HubSpot's CRM, inbound marketing tools, or marketing automation platforms
• Knowledge of cloud platforms like AWS, GCP, or Azure, and containerization (Docker, Kubernetes)
• Contributions to open-source projects or personal projects related to customer flywheels
• Experience with performance optimization, A/B testing, and user delight features
• Understanding of inbound methodology and customer-centric product development

Required Skills

• JavaScript/TypeScript
• React or similar frontend frameworks
• Node.js or Python backend development
• SQL and database design (PostgreSQL/MySQL)
• API design and REST/GraphQL
• Git and collaborative version control
• Agile/Scrum methodologies
• Problem-solving and debugging
• Performance optimization
• Unit and integration testing (Jest, Cypress)
• Cloud services (AWS/GCP)
• Containerization (Docker)
• Cross-functional collaboration
• Customer empathy and user-centric design
• Communication and documentation
• Adaptability in fast-paced environments
• Data analysis for A/B testing

Benefits

• Competitive salary and stock options in a publicly traded company
• Comprehensive health, dental, and vision insurance with generous parental leave
• Unlimited PTO and flexible work-from-anywhere policy
• Home office stipend, laptop allowance, and wellness reimbursement
• Professional development budget for conferences, courses, and certifications
• HubSpot Academy access for ongoing learning in inbound marketing and sales
• Vibrant company culture with team offsites, volunteer days, and HEART awards
• 401(k) matching and employee stock purchase plan
• Daily catered lunches (in-office) and fully stocked kitchens

HubSpot is an equal opportunity employer.