Custom Solutions

When the standard API isn't the whole story.

Some teams need more than a key and a docs page - dedicated infrastructure, custom integrations, or help navigating compliance most APIs leave entirely to you. That's what this is for.

Talk to our team $see what's included

First response

Same business day

Discovery call

30 minutes

Engineer access

Direct, no ticket queue

Engagement basis

Fixed scope, no retainer

Sending high volume, growing fastOperating under compliance requirementsIntegrating with legacy or internal systemsSending on behalf of your own customers

What we build

Six things that come up most often.

Every engagement is scoped around your stack, but most requests fall into a handful of categories.

Custom integrations

Bespoke connectors into the systems you already run - CRMs, core banking platforms, legacy SMPP gateways, or an internal notification service you don't want to rebuild.

Dedicated infrastructure

Isolated sending infrastructure, dedicated IPs or short codes, and rate limits tuned to your traffic instead of a shared pool.

Compliance & registration

Help navigating A2P 10DLC registration, sender ID approvals, and the regulatory requirements that differ by carrier and by country.

Throughput engineering

Architecture review for high-volume sending: priority queues, custom retry and backoff strategies, and failover across providers.

Webhook & workflow design

Event schemas and delivery workflows built around how your product actually needs to react to a message, not just a generic status field.

Migration & onboarding

A staged, zero-downtime migration off a legacy provider, with an engineer on the call for the cutover, not just the kickoff.

Don't see what you need? Most engagements start as a one-off request.

Every engagement includes

Nothing here is a paid add-on.

These aren't upsells - they're how every custom engagement runs, regardless of size.

Direct access to the engineer who builds it, not an account manager relay
A written scope and timeline before any work starts
Signed webhooks and exportable delivery logs by default
A dedicated Slack Connect channel for the length of the engagement
Support for A2P 10DLC and carrier registration paperwork
A 30-day check-in after launch to tune anything that needs it

Finding the right fit

Most teams don't need this. Some do.

The standard API covers the vast majority of use cases. This exists for the rest.

Self-serve

Standard API

Sign up and get an API key in minutes
Usage-based pricing, pay as you send
Shared sending infrastructure
Docs, changelog, and community support

Custom

Custom solutions

Scoped engagement with a dedicated engineer
Fixed-scope pricing tied to the proposal
Dedicated infrastructure where it matters
Direct line to the team that built it

Ways to work with us

Three shapes, one starting point.

Every engagement is quoted individually after the discovery call. These are the shapes most requests take.

Integration Sprint

A focused build for one specific gap.

Best for: a single integration or migration with a clear scope.

One dedicated engineer
Fixed timeline, fixed scope
Standard sending infrastructure
2-week post-launch support window

Start with this

Most common

Managed Scale

Infrastructure and support sized for growth.

Best for: teams outgrowing shared infrastructure.

Dedicated sending infrastructure
Custom throughput & failover rules
Priority support channel
Quarterly architecture review

Start with this

Enterprise Partnership

An ongoing relationship, not a one-off project.

Best for: regulated or multi-region senders.

Dedicated engineering time on retainer
Compliance & carrier registration support
Custom SLAs and reporting
Direct Slack Connect with the team

Start with this

How it works

Four steps, start to launch.

Discovery call

~30–45 minutes

A working conversation about your volume, compliance constraints, and where the standard API stops covering what you need.

Scoping & proposal

Usually within a week

A fixed-scope proposal covering architecture, timeline, and pricing - no open-ended retainers.

Build & integrate

Set in your proposal

An engineer who's worked on the core platform pairs with your team through implementation, not a project manager relaying messages.

Launch & ongoing support

Starts at go-live

You go live with monitoring in place and a direct line to the team that built it - not a shared support queue.

Where this shows up

Built around how your team actually sends.

Fintech OTP at scale

Sub-second delivery expectations, strict compliance requirements, and no tolerance for a dropped verification code.

Logistics & delivery tracking

High-frequency status updates that need to survive carrier throttling without falling behind the truck.

Marketplaces & platforms

Messaging on behalf of thousands of sellers or providers, each needing their own sender identity and delivery visibility.

Internal enterprise tooling

Notifications wired into systems that were never built to talk to the outside world - ticketing, ERPs, internal dashboards.

Retail & e-commerce updates

Order confirmations, shipping updates, and cart recovery sent at volumes that make shared infrastructure start to strain.

Appointment & scheduling reminders

Time-sensitive reminders where a delay or a duplicate send is more than a minor inconvenience.

Dedicated sending configexample

{
  "workspace": "wsp_4b71ea",
  "sending_pool": "dedicated",
  "routes": [
    { "channel": "sms", "provider": "primary", "failover": "secondary" }
  ],
  "rate_limit": { "per_second": 250, "burst": 500 }
}

Under the hood

Still the same primitives, tuned for you.

A custom engagement doesn't mean a different product. It means the same message and webhook model you'd get on the standard API, pointed at infrastructure, routing, and compliance workflows built for your traffic.

Switch between the tabs to see how routing, delivery events, and carrier registration each look under a custom setup.

Security

The same security model, extended for you.

Custom infrastructure doesn't mean a different set of guarantees. It's the same scoped-token and signed-webhook model every workspace runs on, with the registration and dedicated-infrastructure work handled for you.

Read the full security model

Scoped, revocable API tokens per workspace
HMAC-signed webhooks on every delivery event
Support for A2P 10DLC and sender ID registration
A named security contact for the length of the engagement

Questions

Before you reach out.

The standard API is self-serve: sign up, get a key, start sending. Custom solutions involve our team directly - scoping your architecture, building integrations, and in some cases standing up dedicated infrastructure.

Every engagement gets a fixed-scope quote after the discovery call, based on integration complexity, infrastructure footprint, and support level - not a generic per-seat or per-message markup.

No hard minimum. What matters more is fit: teams with compliance requirements, legacy systems to integrate with, or reliability needs the standard plan doesn't cover.

Most start with a discovery call, followed by a fixed-scope proposal. Build timelines vary with complexity, but every engagement is scoped up front so you know what you're getting before it starts.

Yes - the Integration Sprint model exists for exactly this: a scoped, time-boxed build before committing to anything larger.

Yes. Most custom engagements start on the standard API. Moving to a custom setup doesn't require a rewrite - we build on top of the same primitives.

Scope changes get a written amendment before any additional work starts, so pricing and timeline never move without your sign-off.

It depends on the requirement. VPC peering, IP allowlisting, and self-hosted components are all things we can discuss on the scoping call.

Get started

Tell us what you're building.

A short form gets a real reply from the team, not an autoresponder.

1We reply within a business day
230-minute discovery call
3Written proposal within a week