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API & System Integration

Connect CRMs, ERPs, payments, SaaS platforms and internal systems, reliably.

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The problem

Every tool has an API and every integration still breaks: a rate limit, a changed field, a webhook that arrived twice. The cost shows up as duplicated records, missed orders and staff re-checking systems by hand. Integration done well is boring: idempotent, observable, and easy to replay.

What we build

  • Two-way syncs between CRMs, ERPs, payment and email platforms with conflict rules
  • Webhook handlers that dedupe, retry and replay, with a log you can search
  • Internal APIs that give your own systems a clean, documented surface

REST APIs, Webhooks, Payments, Gmail and Google Calendar, Notion, Shopify, Slack

How it works

  1. 01

    Map the flows

    Which system owns which field, what triggers what, and what happens when something fails.

  2. 02

    Design for failure

    Idempotency keys, retries, dead-letter queues and alerts designed before the happy path.

  3. 03

    Build and test

    Contract tests against real sandboxes; every integration observable from day one.

  4. 04

    Operate

    Dashboards for lag and failures, a replay tool, and a runbook for vendor changes.

Work that proves it

  • Webhook Relay home page: forwarding webhooks anywhere, beside a wireframe globe of connections

    Webhook Relay

    Webhook and API infrastructure with SOC 2 Type II, SSO and audit logs

    Designed and developed for the client: webhook forwarding and replay, tunnels, and the audit and access-control surface.

  • Nat.app home page: a personal CRM for relationship building, beside a contact list preview

    Nat.app

    Relationship CRM with Gmail, Calendar, Stripe and Segment

    Designed and developed for the client: relationship data model and the Gmail, Calendar, Stripe and Segment integrations.

  • Userdesk home page: AI assistants that collect leads, beside a chat preview and content sources

    Userdesk

    No-code AI support and lead assistant trained on your site, Notion, PDFs and Drive

    Designed and developed for the client: retrieval pipeline, the embeddable assistant and the lead hand-off flow.

What you get

  • Integration map and ownership rules

  • Integration code with tests

  • Webhook handling with replay

  • Monitoring and alerting

  • Runbook and vendor-change checklist

Questions

What's included in an integration engagement?
An integration map that names which system owns which field and what happens when something fails, then the integration code with tests, webhook handling that dedupes, retries and replays, and monitoring for lag and failures. You also get a replay tool and a runbook with a checklist for the day a vendor changes an API.
How long does one integration take?
One to four weeks per integration. A documented REST API with a sandbox sits at the short end; a system with no sandbox, paginated exports and a field that means two different things sits at the long end. Where several integrations share a queue and a replay tool, the second one is much faster than the first.
What do you need from us?
Credentials for both systems, ideally in a sandbox, and someone who can say which system wins when the same record is edited in two places. That conflict rule is a business decision rather than a technical one, and it is the question that most often holds an integration up.
Who owns the code and the data?
You do. The integration runs in your infrastructure with your API keys, and the event log stays in your accounts. Handover covers the code, the runbook, the vendor-change checklist and a walkthrough of the replay tool.
What happens when the other system changes its API?
It will, so the design assumes it. Contract tests run against the vendor sandbox on a schedule and fail loudly before your users notice. Failed events land in a queue you can inspect and replay once the fix ships, so nothing is silently lost, and the runbook lists each vendor, where their changelog lives and who to tell.

Not sure where to start?

Describe the problem in a few lines. You get a straight answer on what we would build and how long it takes.

Book a 5-minute growth call
Book a 5-minute growth call