Senior Full Stack Engineer, Support Engineering

Calendly is a rapidly growing company that provides scheduling software for millions of users. They are seeking a Senior Full Stack Engineer to shape and scale internal tools and integrations that support their go-to-market teams, collaborating closely with Sales, Marketing, and Customer Success to deliver high-impact solutions.

Responsibilities:

• Design, build, and operate services and APIs for contacts, companies, syncing third party data sources, deduplication, enrichment, and search - prioritizing reliability, performance, and maintainability
• Partner with Product and Design to shape requirements, sequence milestones, and deliver incremental value that supports our customers
• Contribute to our data model and storage strategies for people and related objects, ensuring consistency, privacy, and scalability
• Improve platform resilience with robust observability, fault-tolerant patterns, and production readiness; participate in on-call to support business critical services
• Collaborate with adjacent squads to evolve architecture and shared components; participate in code reviews and provide mentorship to peers
• If you have React/TypeScript experience, contribute to end to end delivery by partnering on UI contracts and occasionally implementing UI that integrates with your services
• Design, build and maintain internal tools, integrations and in product features that enable Sales, Marketing and Customer Success teams to operate efficiently and scale
• Partner closely with cross functional stakeholders to identify pain points, define requirements, and deliver high impact, user centric solutions
• Own projects end to end, from discovery and system design through implementation, testing, deployment and ongoing iteration
• Ensure reliability, performance and scalability of systems while continuously improving developer workflows and internal user experience

Requirements:

• 7-10+ years of professional software development experience, including owning production services at scale in a SaaS environment
• Strong proficiency in backend development, building services, APIs, and data-intensive backend workflows. Must-have
• Experience designing for scalability, reliability and observability in cloud environments (GCP preferred) with container orchestration (Kubernetes)
• Experience with service oriented architectures and modernizing or decomposing legacy systems to services where appropriate
• Proficient with relational databases (PostgreSQL preferred) and data modeling for complex domains
• Bias for clean, maintainable code, thoughtful testing and incremental delivery; strong collaboration and communication skills
• Availability to participate in an on-call rotation for critical services
• Authorized to work lawfully in the United States of America, as Calendly does not engage in immigration sponsorship at this time
• Frontend experience with React and TypeScript or a strong interest in partnering closely on UI contracts and end-to-end delivery
• Experience with microfrontends, Node services, Rails ecosystems, and event-driven architectures