• Design, build and own the onboarding and integration experience for our customers, including intuitive, reliable SDK APIs that make our product easy to adopt for developers. • Partner closely with Product, Design, and Engineering leadership to shape the team’s roadmap, prioritize high-impact work, and deliver features that unlock customer value quickly. • Build in ambiguity: break down complex authentication and identity problems, make pragmatic tradeoffs, and deliver incremental milestones to production. • Raise the bar for the quality of the products you work on through testing, versioning, documentation, backward compatibility, and smooth migration paths. • Improve performance, reliability, and security of client-side flows, especially those on customers’ critical paths. • Mentor and support other engineers through pairing, feedback, and knowledge-sharing, helping raise the team’s technical bar and culture.

• Build and own product capabilities for Stytch’s agentic identity platform on Twilio. • Design, implement, and maintain scalable, reliable distributed services, optimizing for security, latency, and developer experience. • Partner with Product and Engineering leadership to set direction, translate customer needs into technical plans, and deliver high-impact roadmap features. • Collaborate across Twilio and Stytch teams to align on architecture, integrate platform capabilities, and unblock cross-team initiatives. • Write clean, maintainable, and well-tested code, setting a high bar for technical excellence across the team. • Own the end-to-end lifecycle of new services, from initial design and prototyping through to production deployment and operational readiness. • Mentor other engineers on the team, fostering a culture of innovation, ownership, and continuous learning. • Communicate complex technical concepts effectively to diverse audiences, from fellow engineers to executive leadership. • Stay at the forefront of industry trends and emerging threats in identity and authentication to ensure our products are secure and innovative.

What’s in it for you? Ready to make a serious impact? Millions of people already rely on Calendly, and we’re still in the midst of exciting product growth — 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. About the team & opportunity What’s so great about working on Calendly’s Engineering team? We make things possible for our customers through innovation. Why do we need you? Well, we are looking for a Full Stack Engineer who will bring technical know-how and enthusiasm to our team. You will report to one of our Engineering Managers and will be responsible for supporting features and architecture designed to maintain our users’ confidence in Calendly. A day in the life of a Full Stack Engineer at Calendly The Calendly platform 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, Go, Typescript, NodeJS, React, PostgreSQL, Redis, Kubernetes, Rails, to name a few. 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 be working on: - Collaborating within your team to build new features that are targeted at our highest impact enterprise customers - Contributing to platform scaling initiatives - Meeting regularly with Product and Design to fine tune requirements - Attending agile ceremonies to help your team plan out their work and get it done - Working across squads to improve Engineering practices at Calendly - Reviewing implementation plans and pull requests from your peers - Mentoring and coaching other team members What do we need from you? - 4-6 years of professional software development experience in a SaaS or technology-driven environment. - Strong, hands-on full-stack engineering skills, with the ability to independently design, build, and ship production changes across frontend and backend systems - Experience building and maintaining Node.js services that interface with distributed APIs, LLMs, or similar mixed-stack environments. - Hands-on experience with Service-Oriented Architectures (SOA), microservices, and involvement in monolith-to-services modernization or large-scale refactoring initiatives. - Proven ability to own features end-to-end, including technical discovery, design, implementation, testing, release, and ongoing maintenance. - Strong analytical and problem-solving skills, with the ability to dissect complex systems, identify root causes of issues, and deliver scalable, maintainable solutions. - A commitment to writing clean, reliable, and maintainable code, with an emphasis on readability, simplicity, and performance. - Adaptability to new technologies, evolving architectural patterns, and changing organizational priorities. - Experience using AI coding assistants (Copilot, Cursor, etc.) as productivity tools, with a clear understanding of generated code and the ability to defend implementation choices. - Availability for participation in an on-call rotation, ensuring timely and effective responses to critical production issues outside of regular working hours. - Authorized to work lawfully in the United States, as Calendly does not offer immigration sponsorship at this time. Tier 1 Salary Hiring Range $187,680—$227,424 USD Tier 2 Salary Hiring Range $172,040—$208,472 USD Tier 3 Salary Hiring Range $156,400—$189,520 USD The ranges listed above 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 Top Performer 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 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 let your Recruiter know when first connecting with them. Calendly is registered as an employer in many, but not all, states. If you are located in Alabama, Alaska, Delaware, Hawaii, Idaho, Iowa, Montana, Nebraska, North Dakota, Rhode Island, South Dakota, and West Virginia, 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 This role may require occasional travel for company events, team collaboration, or offsites.

• Development of new products, features, APIs, and user experiences. • Build robust infrastructure to support new services and products. • Contribute to engineering best-practices. • Work with product and design to inform trade-offs and scalability concerns.