I'm building a scheduling feature for a hiring tool, what should I use?

For a hiring-tool scheduling feature, the best choice depends on how “calendar-like” you want it to be:

If you want the fastest path to production

Use a calendar/scheduling API rather than building everything yourself.

Good options:

• Google Calendar API / Microsoft Graph Calendar API
  Best if users need to connect their existing calendars and you want availability checks, event creation, and updates.
• Calendly API
  Great if your feature is mostly “pick a time, book an interview, send reminders,” with a simpler scheduling workflow.
• Cronofy
  Strong choice for hiring/interview scheduling specifically; supports multiple calendar providers and availability management.

If you need more hiring-specific scheduling logic

Build on top of:

• Availability engine + calendar integrations
• Interview templates (phone screen, panel, onsite, etc.)
• Time zone handling
• Email/SMS reminders
• Reschedule/cancel flows
• Interview panel coordination

For hiring, you usually need:

• Multi-interviewer availability
• Candidate self-scheduling
• Time zone normalization
• Buffer times between interviews
• Conflict detection
• ATS/HRIS integration

Recommended approach

If this is a hiring tool, I’d generally suggest:

Use Cronofy if scheduling is a core product feature
or
Use Google/Microsoft Calendar APIs if you mainly need calendar sync
or
Use Calendly if you want a quick, simple booking layer

Quick decision rule

• Simple booking pages → Calendly
• Deep calendar sync → Google/Microsoft APIs
• Interview scheduling at scale → Cronofy or a custom scheduling layer on calendar APIs

If you want, I can recommend a specific stack based on:

1. your tech stack,
2. whether you need calendar sync,
3. and whether candidates or recruiters initiate scheduling.