Real-time
Two-way sync
Changes in Resend or Smartrecruiters instantly reflect in both systems. No stale data, no manual imports.
Business productivity ⇄ Human resources
Resend to Smartrecruiters integration — real-time, two-way sync
Keep Resend and Smartrecruiters in sync without custom scripts. Cut weeks of integration work, eliminate silent data drift, and give your team a single, reliable source of truth.
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Adopted by fast-scaling companies moving mission-critical data in real time
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Why teams connect Resend and Smartrecruiters
Keep the people, teams, and status that Resend and Smartrecruiters share aligned in real time, so a hire, role change, or departure recorded in one reaches the other within seconds.
Each tool in Resend keeps its own list of who can use it: users, members, or agents, along with the team they sit on and whether they are still active. Smartrecruiters is the authoritative record of the same people as employees, with their department, manager, and employment status. When those two are connected only by manual account admin or a periodic export, the work tools drift: new hires wait days for access, team and manager changes never catch up, and people who have left keep standing accounts.
Stacksync syncs Email events, API keys, Emails, Contacts in Resend with Candidates, Applications, Jobs, Job Postings in Smartrecruiters bi-directionally and in real time. A person added, moved, or offboarded in Smartrecruiters creates or updates the matching user in Resend within seconds, with field-level mapping and conflict resolution in place of spreadsheets and one-off account changes. Where Resend captures details of its own, such as a corrected contact or a login identity, those can flow back to Smartrecruiters in whichever direction you configure.
Because the sync is field-level, each system keeps its own extras; only the shared facts, who a person is, which team they belong to, and whether their access should be on, are held in agreement.
Common use cases
- 01 Write delivery, bounce, and complaint events back to the CRM or a Postgres table for deliverability reporting.
- 02 Trigger transactional sends when a row changes in an operational database, such as an order status update.
- 03 Two-way sync Candidates and Applications with Postgres so recruiting-ops apps read and update hiring status, tags, and custom fields in SQL while recruiters keep working in SmartRecruiters.
- 04 Write enriched or sourced Candidates from external sourcing tools into SmartRecruiters and keep contact fields refreshed as data changes.
Common sync patterns
Onboarding: access ready on day one
A new hire recorded in Smartrecruiters creates the matching user in Resend with the right team and manager already set, so people can start working without waiting on a provisioning ticket.
Offboarding: no standing access after a departure
When someone is marked as leaving in Smartrecruiters, the matching account in Resend is deactivated or flagged, so departures do not leave open access behind.
One employee directory
A person's name, title, contact details, or status corrected in either system updates the other, so both sides stop maintaining separate copies of the same person.
What you can sync between Resend and Smartrecruiters
Representative objects on each side — any object or custom field can map to any target. Schemas are auto-detected; types are converted between the two systems.
| Resend objects | Smartrecruiters objects | How this pairing syncs | |
|---|---|---|---|
| API keys Scoped credentials managed per environment for send and read access. | Interviews Interview types, timeslots, templates, and scheduled interviews with interviewers and times; created, updated, and read for scheduling and interviewer-load analytics. | API keys is specific to Resend and Interviews to Smartrecruiters — each maps to any object or custom field on the other side. | |
| Emails Sent messages retrievable by ID with current delivery status. | Offers Offer records tied to an Application with status, custom offer fields, and offer documents; readable and writable, commonly synced to an HRIS on hire (documents endpoint limited to 2 requests/sec). | Emails is specific to Resend and Offers to Smartrecruiters — each maps to any object or custom field on the other side. | |
| Contacts Recipient records with email, name, and subscription state, synced from CRMs or databases. | Users Company users (recruiters, hiring managers) with roles, access groups, and activation state; read and written via the User Management API. | Contacts is specific to Resend and Users to Smartrecruiters — each maps to any object or custom field on the other side. | |
| Audiences Named contact lists that broadcasts target; typically mirrored from CRM segments. | Approvals Approval requests for jobs and offers; requests can be created, retrieved as pending, commented on, and approved or rejected via the Approvals API. | Audiences is specific to Resend and Approvals to Smartrecruiters — each maps to any object or custom field on the other side. | |
| Broadcasts One-to-many campaign sends addressed to an audience. | Candidates Person records with contact details, tags, attachments, custom properties, and consent; created, updated, and searched via the Candidates API, often populated from sourcing or enrichment pipelines. | Broadcasts is specific to Resend and Candidates to Smartrecruiters — each maps to any object or custom field on the other side. | |
| Domains Verified sending domains with DNS and DKIM status. | Applications Links a Candidate to a Job and carries the current hiring status and source; created and advanced through statuses (screening, interview, offer, hired, rejected) via the Application API. | Domains is specific to Resend and Applications to Smartrecruiters — each maps to any object or custom field on the other side. |
How changes propagate between Resend and Smartrecruiters
Each direction of the sync is driven by what the source system can signal and what the destination accepts — detection, delivery, and expected latency below.
Resend Smartrecruiters Sub-second propagation
DetectionResend notifies Stacksync of record changes through webhook events. Webhooks for email lifecycle events.
DeliveryEach detected change is written to Smartrecruiters through its API, with automatic retries and rate-limit backoff.
Smartrecruiters Resend Sub-second propagation
DetectionSmartrecruiters notifies Stacksync of record changes through webhook events. Webhooks API — subscribe to events (new application, candidate updated, status changed) delivered with a signing secret and retrievable callback logs.
DeliveryEach detected change is written to Resend through its API, with automatic retries and rate-limit backoff.
Rate-limit considerations
- Smartrecruiters: Per API credential: most endpoints allow up to 10 requests/sec (job publication and offer documents 2/sec), plus a concurrency limiter of up to 8 simultaneous requests (GET /candidates capped at 1). Exceeding returns 429; responses carry X-RateLimit-Limit/Remaining and concurrent-limit headers.
What ships with Resend ⇄ Smartrecruiters
Connect Resend and Smartrecruiters for flexible, real-time data sync.
Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Resend–Smartrecruiters connection.
No-code + pro-code
Workflow automation
Trigger automated workflows whenever Resend or Smartrecruiters data changes, update records, fire webhooks, or kick off sequences without brittle API scripts.
At scale
Event queues
Handle millions of events per minute without losing a single Resend or Smartrecruiters record.
Observability
Monitoring
Track your Resend ⇄ Smartrecruiters sync health, view errors, and replay failed events in one click.
Trading partners
EDI
Transform legacy EDI complexity into simple database interactions between Resend and Smartrecruiters.
How the Resend and Smartrecruiters connectors work
Resend
- Integration surface
- REST API
- Authentication
- API key (Bearer token)
- Change detection
- Webhooks for email lifecycle events; polling for contact and audience state
- Capabilities
- read · write · webhooks
Smartrecruiters
- Integration surface
- SmartRecruiters REST APIs (SmartAPIs) on api.smartrecruiters.com — Candidates, Application, Jobs, Interviews, Offers, Users, Approvals, plus a Webhooks API for event subscriptions
- Authentication
- X-SmartToken API key header for a customer's own integration (grants full company access, no scopes or expiry), or OAuth 2.0 authorization-code flow for partner and Marketplace apps with user-scoped permissions
- Change detection
- Webhooks API — subscribe to events (new application, candidate updated, status changed) delivered with a signing secret and retrievable callback logs; otherwise poll list endpoints with updated-after-style filters. No log-based change data capture.
- Capabilities
- read · write · webhooks
- Rate limits
- Per API credential: most endpoints allow up to 10 requests/sec (job publication and offer documents 2/sec), plus a concurrency limiter of up to 8 simultaneous requests (GET /candidates capped at 1). Exceeding returns 429; responses carry X-RateLimit-Limit/Remaining and concurrent-limit headers.
How it works
How to connect Resend to Smartrecruiters — three steps, no code
Configure and sync within minutes, no code. Whether you sync 50k or 100M+ records, Stacksync handles the queues, infra, and plumbing. Integrations are non-invasive and need zero setup on your systems.
- 01
Connect your apps
Authenticate Resend and Smartrecruiters with each platform's native method — OAuth, API keys, or service accounts — plus secure options like SSH tunneling, IP whitelisting, and VPC peering.
Resend
connected
Smartrecruiters
connected
OAuth 2.0SSH tunnelSSL certificateVPC peering - 02
Choose tables
Pick the Resend and Smartrecruiters objects to sync — Stacksync auto-detects both schemas, including custom fields where the platform exposes them. Sync to existing tables, or let Stacksync create new ones with ideal data types.
objects · Resend ⇄ SmartrecruitersCustomers 12,480Sales Orders 8,213Invoices 5,902Items 1,344 - 03
Map fields
Fields map automatically even when names and types differ. Stacksync handles transformation and type casting for you, zero configuration required.
Resend SmartrecruitersCompany company_name textEmail email textAmount amount numericCreated created_at timestamp
FAQ
Resend and Smartrecruiters integration FAQ
-
Yes. Stacksync provides a managed, real-time two-way integration between Resend and Smartrecruiters: authenticate both systems, choose the objects to sync (such as Resend's API keys and Emails), map fields visually, and changes propagate both ways in milliseconds — no code required.
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Stacksync pricing is usage-based and starts at $1,000/month, including the managed Resend and Smartrecruiters connectors, real-time two-way sync, monitoring, and support. That replaces building and maintaining a custom Resend–Smartrecruiters integration in-house.
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Yes — Stacksync ships production-grade connectors for both Resend and Smartrecruiters. The connectors handle authentication, schema detection, rate limits, and retries; you configure the sync, and Stacksync operates it.
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Change detection on Resend: Webhooks for email lifecycle events; polling for contact and audience state. On Smartrecruiters: Webhooks API — subscribe to events (new application, candidate updated, status changed) delivered with a signing secret and retrievable callback logs; otherwise poll list endpoints with updated-after-style filters. No log-based change data capture. Each detected change propagates to the other side in milliseconds, with field-level conflict resolution and an inspectable event log.
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On the Resend side: Email events, API keys, Emails, Contacts, plus custom fields where Resend exposes them. On the Smartrecruiters side: Candidates, Applications, Jobs, Job Postings. Stacksync auto-detects both schemas and converts types between the two systems.
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Yes. Each object mapping can be bidirectional or restricted to a single direction (both systems accept writes). Read-only mirrors, one-way pushes, and full two-way sync can be mixed in the same integration.
SECURITY
Security teams trust Stacksync
As a data company, we understand the importance of keeping your data secure. Stacksync is built with security best practices to keep your data safe at every layer, and is DPF-certified for US, EU, UK and CH data transfers.
SOC 2 Type II
ISO 27001
HIPAA BAA
GDPR
CCPA
DPF US-EU-UK-CH
→ SECURITY WITH BENEFITS
SSO & SCIM
Let your users access Stacksync from your centralized user management systems. Works with Okta, Azure, Google SSO and more.
Alerts
Immediately get alerted about record syncing issues over email, Slack, PagerDuty and WhatsApp. Resolve issues from a centralized dashboard with retry and revert options.
Secure connection options
Securely connects to your systems with:
Related integrations
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