Note: The job is a remote job and is open to candidates in USA. Calendly is hiring a Full Stack Engineer III for its Trust & Safety team. The role builds and improves systems that prevent abuse, protect email and SMS deliverability and compliance, and support operational response to abuse.
Responsibilities
- Building and improving the systems that detect and stop abuse across sign-up, booking, and messaging, such as spam, phishing, bots, and fraudulent SMS traffic
- Improving the reliability, deliverability, and compliance of the email and SMS notifications Calendly sends
- Shipping new detection carefully: measuring how it performs on real traffic before it acts on accounts, and weighing false positives against false negatives
- Responding to active abuse, including during on-call, by stopping the damage fast, then replacing quick fixes with durable ones
- Building tools that help our Trust & Safety Operations team review accounts faster and understand why the system took each action
- Partnering with Product, Operations, and Data to define requirements and measure the impact of what we ship
- Working with other product teams to add protections to the flows they own
- Reviewing implementation plans and pull requests, and sharing what you learn with the team
Skills
- 3+ years of professional software development experience at a SaaS or technology company, including building and running production systems
- Strong backend skills: building services, APIs, and data-heavy workflows in a service-oriented architecture
- Experience with Rails, Node/TypeScript, Go, or a comparable language or framework, and a willingness to work across more than one
- Comfort with relational databases and SQL, and with using data to check whether a change actually worked
- An analytical, curious mindset: you think about how a system could be misused, not only how it's supposed to be used
- Good judgment about trade-offs, such as stopping bad actors without adding friction for real customers
- A commitment to clean, reliable, maintainable code, thoughtful testing, and shipping in small increments
- Clear communication with engineers and non-engineers alike, including Operations and Support partners
- Comfort and skill with AI tools in your engineering work, including reviewing their output critically
- Authorized to work lawfully in the United States of America as Calendly does not engage in immigration sponsorship at this time
- Experience in trust and safety, fraud, spam, or abuse prevention
- Experience with email or SMS delivery, such as deliverability, sender reputation, or messaging compliance
- Experience with bot protection, rate limiting, or third-party risk and verification services
- Experience building rules engines, risk scoring, or ML-backed decisions in production
- Experience using LLMs to classify or moderate user-generated content
- Experience with GCP, Kubernetes, PostgreSQL, or Redis
Benefits
- All full-time (30 hours/week) employees are also eligible for equity awards.
- Remote - US
Company Overview