Building messaging infrastructure vs using managed lines
Building in-house is a valid engineering decision. This page lists what the build actually includes, neutrally, so the decision is made with the full parts list on the table.
The build list
An in-house messaging layer that supports modern channels typically involves:
- Device or account infrastructure where applicable to the channel
- Worker fleets and their lifecycle management
- Account health management and rotation
- Queue handling with backpressure and priority
- Duplicate prevention across retries and restarts
- Incoming message processing and attribution
- Delivery-state tracking across provider callbacks
- Monitoring, alerting, and on-call rotation
- Credential security and audit
- The permanent support burden of all of the above
The managed list
- Provisioned messaging lines, operated for you
- One API to send; queued responses with full lifecycle tracking
- Delivery events and incoming replies on signed webhooks
- Support-assisted test setup and production activation
- Managed operations, monitoring, and line health
How to decide
The honest question is not "can we build it" — most teams can — but "should this team own this system for years." If messaging is core to your product's identity, owning it may be strategic. If it's plumbing, every hour on the build list above is an hour not spent on your product.
An integration review can walk your specific list — no commitment required.