Full Stack Engineer, Trust & Safety

About the team & opportunity 

What’s so great about working on Calendly’s Trust & Safety team?
Our Trust & Safety team is tasked with safeguarding our platform’s integrity and addressing a range of challenges including detecting and mitigating fraudulent activity, preventing abuse, and ensuring compliance with legal and regulatory standards. You will play a crucial role in designing, developing, and maintaining our system to prevent, detect, and respond to these threats in real-time – in an automated fashion.

Why do we need you?
We are looking for a Full Stack Engineer III who will bring strong technical competency and distributed systems experience, enjoys solving complex problems with a results driven mindset, and fosters a strong sense of ownership and operational excellence. You will report to the Senior Engineering Manager, Trust & Safety in this role.

A day in the life of a Full Stack Engineer, Trust & Safety at Calendly

The Calendly system is a monolith that is being decomposed into various services in order for us to scale our platform and team. We need ambitious, experienced engineers who can help us drive this stage of growth. As an engineer at Calendly, you will both build new features and work to scale our platform and architecture. You will build tooling and automation to fine tune our delivery process as you grow into a service oriented specialist. You will also learn to work with multiple technologies such as Google Cloud Platform, Kubernetes, Argo Workflows, Go, Node, TypeScript, Rails, React, PostgreSQL, Redis, and more.

When you join Calendly, you get the opportunity to deliver on a product used by millions and known for its best-in-class quality. Help us continue to deliver critical features to our users with excellence.

On a typical day, you will: 

• Design and implement systems to detect and mitigate fraud, abuse, and other threats to platform integrity.
• Develop algorithms and machine learning models to identify patterns of malicious behavior and enforce preventive measures.
• Collaborate with Product, Legal, and Security teams to ensure compliance with evolving regulatory requirements and industry standards.
• Build monitoring and alerting tools to proactively address emerging threats.
• Optimize performance and scalability of Trust & Safety systems to support the platform's growth.
• Conduct root cause analyses of incidents and implement long-term fixes to enhance system resilience.
• Stay informed about new security threats, vulnerabilities, and mitigation strategies in the Trust & Safety domain.
• Mentor junior engineers and contribute to building a strong engineering culture.

What do we need from you?

• 3–5 years of software development experience, ideally at a SaaS or technology company.
• Interest in the Trust & Safety domain and some exposure to challenges like spam detection, account abuse, or content moderation – direct experience is a plus but not required.
• Familiarity with basic machine learning concepts or data-driven approaches to identifying patterns of misuse or abuse is helpful but not required.
• Solid understanding of modern web architectures and backend systems – experience contributing to high-availability or scalable systems is a plus, but deep infrastructure ownership is not expected.
• Experience working with cloud providers (e.g., GCP, AWS, or Azure) and a willingness to learn tools like Terraform and infrastructure-as-code practices.
• Proficiency in JavaScript/TypeScript and a modern backend framework like Node.js or Rails. You write clean, testable code and are comfortable writing unit and integration tests.
• Strong problem-solving and analytical thinking skills – you can break down complex problems and contribute to practical solutions.
• A team mindset and the ability to collaborate effectively across functions, with strong communication skills to work with product managers, designers, and other engineers.
• Availability for participation in on-call rotation, ensuring prompt and effective responses to business-critical alerts outside of regular working hours.
• Authorized to work lawfully in the United States of America as Calendly does not engage in immigration sponsorship at this time.

What’s in it for you? 

Ready to make a serious impact? Millions of people already rely on Calendly’s products, and we’re still in the midst of our growth curve — it’s a fantastic time to join us. Everything you’ll work on here will accelerate your career to the next level. If you want to learn, grow, and do the best work of your life alongside the best people you’ve ever worked with, then we hope you’ll consider allowing Calendly to be a part of your professional journey.

If you are an individual with a disability and would like to request a reasonable accommodation as part of the application or recruiting process, please contact us at recruiting@calendly.com . 

Calendly is registered as an employer in many, but not all, states. If you are located in Alaska, Hawaii, Montana, North Dakota, South Dakota, Nebraska, Iowa, West Virginia, and Rhode Island, you will not be eligible for employment. Note that all individual roles will specify location eligibility.

All candidates can find our Candidate Privacy Statement here

Candidates residing in California may visit our Notice at Collection for California Candidates here: Notice at Collection

The ranges listed below are the expected annual base salary for this role, subject to change.

Calendly takes a number of factors into consideration when determining an employee’s starting salary, including relevant experience, relevant skills sets, interview performance, location/metropolitan area, and internal pay equity.

Base salary is just one component of Calendly’s total rewards package. All full-time (30 hours/week) employees are also eligible for our Quarterly Corporate Bonus program (or Sales incentive), equity awards, and competitive benefits.

Calendly uses the zip code of an employee’s remote work location, or the onsite building location if hybrid, to determine which metropolitan pay range we use. Current geographic zones are as follows:

• Tier 1: San Francisco, CA, San Jose, CA, New York City, NY
• Tier 2: Chicago, IL, Austin, TX, Denver, CO, Boston, MA, Washington D.C., Philadelphia, PA, Portland, OR, Seattle, WA, Miami, FL, and all other cities in CA.
• Tier 3: All other locations not in Tier 1 or Tier 2