Third-party API integration

1.8–4.6 weeks typical Fixed quote after scoping

Your product connected to the tools your business runs on — Slack, Asana, CRMs, content and data APIs — with idempotent syncing and retries that make the connection dependable.

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What we build

'Connect it to X': your product wired into the tools your business already runs on — Slack, Asana, CRMs, ticketing, content and data APIs — through clean adapter seams with test fakes, so each integration is dependable and swappable rather than a tangle. Syncs are idempotent (rerunning never duplicates), retries respect each provider's limits, and external-party access — a client invited into a project board, a shared Slack channel — is managed as carefully as the data itself. Choose this to connect systems you already have; if the connection is for an AI assistant to act through, that's MCP server development.

What you get

  • An adapter module per connected system, in a Git repository
  • Test fakes for each connected system, exercised by CI
  • A rerun test proving syncs can repeat without creating duplicate records
  • A documented retry policy per provider, with tests covering rate-limit and server-error responses

How the work unfolds

  1. Build adapter seams with test fakes
  2. Implement idempotent create and update syncs
  3. Add retries honouring each provider's limits
  4. Manage guest and external access
  5. Wire notification and webhook channels end to end
  6. Set up transactional email and SMS delivery

What shapes the price

Before you see a number, our scoping conversation asks:

  • How many systems are we connecting — the CRM, the accountancy package, the calendar? Each connected system is its own adapter, credentials and failure modes. Count each system once across the whole plan: the business tools your team runs on — CRM, accountancy, calendar, chat — belong here; providers the backend itself depends on (payments, email delivery) belong to backend integrations & events.
  • Should the system send emails or texts to people — receipts, invites, reminders? Transactional email/SMS is its own provider setup and templates.
  • Do other systems need to be told when things happen here — webhooks out, notifications into Slack? Outbound webhook/notification channels are separate from pulling data in.
  • Will people outside your organisation — clients, partners — need their own limited access? Guest access with scoped roles is its own invitation and permission flow.

How an engagement starts

This work builds on Discovery workshop, so scope, boundaries and constraints are agreed before anything is built.

Teams often combine it with:

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