Real-time
Two-way sync
Changes in Firebase or Kustomer instantly reflect in both systems. No stale data, no manual imports.
Database ⇄ CRM
Firebase to Kustomer integration — real-time, two-way sync
Keep Firebase and Kustomer in sync without custom scripts. Cut weeks of integration work, eliminate silent data drift, and give your team a single, reliable source of truth.
- SOC 2 and 6 other compliance frameworks
- POC with real engineers in minutes
Adopted by fast-scaling companies moving mission-critical data in real time
Case study
Migrated from Mulesoft
Case study
Migrated from Celigo
Migrated from Heroku Connect
Migrated from Matillion
Case study
Migrated from Fivetran
Case study
Migrated from Celigo
Why teams connect Firebase and Kustomer
Treat Kustomer like part of your database: its records live in Firebase as real tables, and writes in either place sync to the other in seconds.
Product and engineering teams constantly need CRM data, and the CRM API is a poor way to get it: rate limits, pagination, custom objects, and integration code that breaks when an admin renames a field. What they actually want is the data in Firebase, where it can be queried and joined like everything else.
Stacksync mirrors Users, Teams, Tags, Notes from Kustomer into Firestore Documents, Subcollections, Realtime Database Nodes, Authentication Users in Firebase with real-time, bi-directional sync. Read CRM records with plain queries; write updates from your application and they appear in Kustomer with validation intact. Go-to-market teams keep working in the CRM, engineers keep working in the database, and neither has to think about the other.
Common use cases
- Mirror conversations and satisfaction data into a warehouse for support analytics and agent performance reporting
- Keep customer attributes updated from billing systems so routing rules and SLAs reflect account value
- Mirror Firestore collections into Postgres or a warehouse to run SQL analytics on app data.
- Write CRM-side changes (plan, status, owner) back into Firestore documents the app reads.
Query the CRM like a database
Accounts, contacts, and custom objects from Kustomer become tables in Firebase you can join with application data directly.
Product events onto CRM records
Signup, usage, or lifecycle changes written to Firebase sync onto the matching records in Kustomer, giving go-to-market teams live product context.
Internal tools without API code
Back-office apps read and write the synced tables; Stacksync handles the Kustomer API, limits, and retries.
What you can sync between Firebase and Kustomer
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.
| Firebase objects | Kustomer objects | |
|---|---|---|
| Firestore Collections Top-level groupings of documents that a sync maps to tables or SaaS objects. | Conversations Support threads across channels sync outward for analytics and CRM context. | |
| Firestore Documents Schemaless JSON-like records, the primary unit synced to and from external systems. | Messages Individual messages within conversations support full-thread replication. | |
| Subcollections Nested collections under documents, typically flattened into related tables during sync. | Companies Organization records group customers and map to CRM accounts. | |
| Realtime Database Nodes JSON tree paths in the older Realtime Database, synced by path. | Custom Objects (Klasses) Structured external records such as orders and subscriptions synced in to appear on the customer timeline. | |
| Authentication Users User accounts read into CRMs and warehouses for customer records. | Users Agent records map conversation ownership to people in other systems. | |
| Cloud Storage Objects Files referenced from documents; usually synced as metadata plus URLs. | Teams Team assignments support routing parity and reporting. |
What ships with Firebase ⇄ Kustomer
Connect Firebase and Kustomer for flexible, real-time data sync.
Real-time sync, workflow automation, event queues, EDI, and monitoring, for every Firebase–Kustomer connection.
No-code + pro-code
Workflow automation
Trigger automated workflows whenever Firebase or Kustomer 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 Firebase or Kustomer record.
Observability
Monitoring
Track your Firebase ⇄ Kustomer sync health, view errors, and replay failed events in one click.
Trading partners
EDI
Transform legacy EDI complexity into simple database interactions between Firebase and Kustomer.
How the Firebase and Kustomer connectors work
Firebase
- Integration surface
- REST and gRPC APIs, typically accessed through the Firebase Admin SDK
- Authentication
- Google service account credentials (IAM) for server-side access; Firebase Auth tokens for client contexts
- Change detection
- Real-time snapshot listeners on Firestore queries and Cloud Functions triggers on document changes
- Capabilities
- read · write
- Rate limits
- Subject to Firestore's documented operation quotas and per-document write throughput limits
Kustomer
- Integration surface
- REST API
- Authentication
- API key used as a bearer token, scoped by role
- Change detection
- Outbound webhooks on record events, plus polling for backfill
- Capabilities
- read · write · webhooks
- Rate limits
- Subject to the platform's API rate limits
How it works
How to connect Firebase to Kustomer — 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 Firebase and Kustomer with each platform's native method — OAuth, API keys, or service accounts — plus secure options like SSH tunneling, IP whitelisting, and VPC peering.
Firebase
connected
Kustomer
connected
OAuth 2.0SSH tunnelSSL certificateVPC peering - 02
Choose tables
Pick the Firebase and Kustomer 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 · Firebase ⇄ KustomerCustomers 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.
Firebase KustomerCompany company_name textEmail email textAmount amount numericCreated created_at timestamp
FAQ
Firebase and Kustomer integration FAQ
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Yes. Stacksync provides a managed, real-time two-way integration between Firebase and Kustomer: authenticate both systems, choose the objects to sync (such as Firebase's Firestore Collections and Firestore Documents), map fields visually, and changes propagate both ways in milliseconds — no code required.
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Firebase: REST and gRPC APIs, typically accessed through the Firebase Admin SDK. Authentication: Google service account credentials (IAM) for server-side access; Firebase Auth tokens for client contexts. Kustomer: REST API. Authentication: API key used as a bearer token, scoped by role. Stacksync manages authentication, retries, and rate limits on both sides.
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Kustomer: Kustomer's data model centers on a customer timeline: conversations, messages, and custom object records all appear chronologically against one customer record rather than as separate tickets. Firebase: Snapshot listeners deliver document changes to connected clients in real time, which is the platform's native change-notification mechanism. Stacksync's field mapping accounts for these differences between Firebase and Kustomer without custom code.
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Stacksync is SOC 2 Type II and ISO 27001 certified with HIPAA BAA support. Data is encrypted in transit, and a zero-persistent-storage architecture means Firebase and Kustomer records are not retained after a sync operation.
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Stacksync pricing is usage-based and starts at $1,000/month, including the managed Firebase and Kustomer connectors, real-time two-way sync, monitoring, and support. That replaces building and maintaining a custom Firebase–Kustomer integration in-house.
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Yes — Stacksync ships production-grade connectors for both Firebase and Kustomer. The connectors handle authentication, schema detection, rate limits, and retries; you configure the sync, and Stacksync operates it.
SECURITY
Security teams love 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
CSA STAR
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
Every pair below is a real-time, two-way sync. Search all 386 integrations available for Firebase and Kustomer.
Popular · 8 of 386
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Firebase ⇄ Affinity -
Firebase ⇄ 6sense -
Firebase ⇄ Apollo.io -
Firebase ⇄ Clearbit -
Kustomer ⇄ IBM AS/400 -
Kustomer ⇄ IBM Informix -
Kustomer ⇄ InfluxDB -
Kustomer ⇄ InterSystems IRIS
No integrations match .
