API Integration
Connecting a product to a third-party system, with the retry, backfill and reconciliation work priced.
5 categories20 tasks128h - 292h estimated
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Integrations get quoted as "connect A to B" and delivered as retries, backfills and reconciliation. This template prices the whole job in 20 tasks across Discovery, Build, Data Migration, Testing and Launch & Support, so the invisible engineering that makes an integration trustworthy is in the number from the start.
The expensive surprises are predictable: the third-party API that behaves differently than its documentation, the historical data that has to be backfilled without double-writing, the failure modes that only show up under load, and the reconciliation report that proves the two systems agree. Each is a line item here with an hour range, which turns "why is this taking so long" into a scope your client already approved.
One click copies the breakdown into your workspace. Edit it with your team, tighten the ranges to the systems you are actually connecting, and keep the estimate open next to the project as the single document everyone updates together.
What's in this estimate
Discovery | Estimated time (h) |
|---|---|
Vendor API review and limits Read the docs properly. Rate limits, pagination and what the API cannot do. | 4.0 - 10.0 |
Auth model and credential handling OAuth or keys, rotation, and where the secrets are going to live. | 3.0 - 8.0 |
Field mapping and data contract Field-by-field mapping between both systems, signed off before build. | 6.0 - 16.0 |
Sandbox access and test accounts Getting credentials out of the vendor. Frequently the longest lead time here. | 2.0 - 6.0 |
| Hours | 15.0 - 40.0 |
Build | Estimated time (h) |
|---|---|
Client library and transport layer HTTP client, serialisation, logging and configuration. | 8.0 - 16.0 |
Authentication and token refresh Token acquisition, refresh, expiry handling and revocation. | 6.0 - 14.0 |
Data mapping and transformation The mapping layer both ways, including the fields that do not line up. | 12.0 - 30.0 |
Sync scheduling and queueing Scheduled and on-demand sync, queued so it survives a slow vendor. | 10.0 - 24.0 |
Webhook receiver and verification Endpoint, signature verification, replay protection and ordering. | 8.0 - 18.0 |
Retry, backoff and idempotency The difference between an integration that works and one that pages you. | 8.0 - 16.0 |
Error handling and alerting Classified failures, a dead letter path and alerts a human will act on. | 6.0 - 12.0 |
| Hours | 58.0 - 130.0 |
Data Migration | Estimated time (h) |
|---|---|
Historical backfill Importing existing records, throttled to stay inside the rate limit. | 8.0 - 24.0 |
Reconciliation report Proving both systems agree, and showing the client where they do not. | 6.0 - 12.0 |
| Hours | 14.0 - 36.0 |
Testing | Estimated time (h) |
|---|---|
Integration tests against sandbox Automated coverage of the happy paths against the vendor sandbox. | 10.0 - 20.0 |
Failure and rate-limit scenarios Timeouts, 429s, partial failures and duplicate delivery. | 6.0 - 12.0 |
End-to-end UAT with the client Walking the client through real records in their own data. | 6.0 - 12.0 |
| Hours | 22.0 - 44.0 |
Launch & Support | Estimated time (h) |
|---|---|
Runbook and documentation How it works, how it fails and what to do at 3am. | 4.0 - 10.0 |
Monitoring dashboard Sync volumes, failure rates and queue depth, visible without a shell. | 4.0 - 8.0 |
Production cutover Credentials, first live sync and a rollback plan. | 3.0 - 8.0 |
Post-launch stabilisation The fortnight after go-live, when the real data arrives. | 8.0 - 16.0 |
| Hours | 19.0 - 42.0 |
20
128.0 - 292.0
Make it your estimate
One click copies all 20 tasks into your workspace - then edit the hours with your team to fit the project in front of you.
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