We’re looking for a Senior Software Engineer with backend expertise in Go to design and build reliable, scalable services that underpin the Contact Management experience. You’ll own critical services and APIs, collaborate cross-functionally with Product and Design, and help evolve our architecture and data model to support rapid iteration and high availability. The platform includes technologies such as Google Cloud Platform, Kubernetes, Go, Node/TypeScript, React, PostgreSQL, and Redis; experience with Go is required, and React experience is a plus.
A day in the life of a Senior Full Stack Engineer
• Design, build, and operate Go 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.
What You’ll Do
• Core contact and company CRUD with a clean, extensible data model and API surface.
• Sync from various third-party sources, import pipelines, deduplication and merge flows.
• Foundations that enable notes, tasks, permissions, and sharing models across users and teams
What do we need from you?
• 7-10+ years of professional software development experience, including owning production services at scale in a SaaS environment.
• Strong proficiency in backend development with Go (Golang), 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.
Nice to have:
• 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.
• Background in contact management domains, search, deduplication, or enrichment pipelines.
Other requirements:
• 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.
Skills:
Application Programming Interface (API), Business Services, Business Support, Cloud Computing, Code Reviews, Communication Skills, Contact Management, Cross-Functional, Customer Support/Service, Data Cleaning, Data Modeling, Data Storage, Ecosystems, Establish Priorities, GCP (Good Clinical Practices), Go Programming Language (Golang), High Availability, Mentoring, On Call, PostgreSQL, Product Design, React.js, Redis, Relational Databases (RDBMS), Scalable System Development, Service-Oriented Architecture (fka Distributed Object Architecture), Software Development, Software Engineering, Software as a Service (SaaS), Surface Modeling, Team Player, User Interface/Experience (UI/UX)
About the Company:
Calendly
