Frontend Platform Engineer III

Calendly

Frontend Platform Engineer building foundational capabilities for Calendly's product ecosystem. Develop shared frontend architecture and improve engineering standards for product teams.

Posted 6/1/2026full-timeRemote • 🇺🇸 United StatesMid-LevelSenior💰 $156,400 - $227,424 per yearWebsite

Tech Stack

Tools & technologies

ReactTypeScriptWebpack

About the role

Key responsibilities & impact

As a Frontend Platform Engineer on Calendly’s App Platform team, you will be instrumental in building the foundational capabilities that power our product ecosystem.
Your work will directly impact how our engineering teams ship features and the quality of experience they deliver to millions of Calendly users.
You'll help evolve our shared React architecture, package ecosystem, and developer experience.
You'll contribute to engineering standards, strengthen the reliability of our frontend infrastructure, and build the resilient tooling and migration paths our growing platform demands.
You will work hands-on with technologies like React and Webpack to build highly resilient, scalable systems; from real-time server-to-client data infrastructure to shared frontend services.
You will partner with product managers, designers, and engineering teams across Calendly to translate their needs into robust platform solutions that serve the entire organization.
Ensure reliability and performance of platform services through thoughtful monitoring, testing, and incident response.

Requirements

What you’ll need

3+ years of software engineering experience at a SaaS or technology company, with a strong focus on modern frontend architecture
Strong proficiency in React, TypeScript, and Webpack (or comparable build tooling), including application architecture, dependency management, and performance optimization
Experience designing and maintaining shared frontend platforms, libraries, and infrastructure used across multiple teams
Experience with package ecosystems (versioning, upgrades, migrations, and compatibility across apps)
Experience building systems and processes that keep frontend dependencies up to date, stable, and aligned across teams
Ability to partner with product engineering teams to improve application architecture, performance, and maintainability in React apps
Strong debugging skills, with experience diagnosing cross-app issues spanning packages, build systems, runtime behavior, and CI/CD pipelines
Experience supporting large-scale migrations (e.g., library upgrades, architectural shifts, routing changes, state management transitions)
Familiarity with CI/CD pipelines, release workflows, and automation for frontend packages and applications
Strong communication skills, able to collaborate with design system teams, product engineers, and infrastructure partners
Authorized to work lawfully in the United States of America as Calendly does not engage in immigration sponsorship at this time.

Benefits

Comp & perks

Top Performer Bonus program (or Sales incentive)
Equity awards
Competitive benefits

ATS Keywords

✓ Tailor your resume

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools

ReactTypeScriptWebpackfrontend architectureperformance optimizationdependency managementdebuggingCI/CD pipelinesmigrationapplication architecture

Soft Skills

communicationcollaboration