Backend Development
API Integration
Teams connecting their product to a third-party service (Stripe, Shopify, HubSpot, Notion) without breaking production.
Assumes credentials are provisioned by end of week 1.
Scope of work
Every section is written with the failure modes in mind — the things that typically go wrong on api integration projects. Use them verbatim or edit to match how you actually deliver.
- 01
Integration Spec & Edge-Case Map
Document the data model, auth flow, rate limits, error codes, and retry semantics of the target API. Map 8–12 edge cases that silently fail in production if ignored.
- 02
Authentication & Credentials
OAuth, API key, or webhook secret setup; environment separation across dev / staging / prod; and a written credential rotation plan with ownership.
- 03
Data Synchronization Layer
Sync jobs (initial backfill plus incremental updates) with idempotency, deduplication, and a dead-letter queue for failed records — so no record is lost without a trace.
- 04
Webhook Handling & Replay
Signed webhook verification, deduplication by event ID, and a replay mechanism for historical events. Webhooks are the #1 source of silent data drift.
- 05
Monitoring & Runbook
Dashboards for success rate, latency, and error taxonomy. One-page runbook covering the 5 most likely failure modes and their fixes.
Deliverables
What the client gets at the end. Specific enough to be defendable; editable enough to match your exact delivery.
- Integration codebase (PR-reviewed, merged to main)
- Environment-separated API credentials + rotation doc
- Sync jobs running on schedule (cron or queue-backed)
- Webhook handler with signed verification + replay endpoint
- Monitoring dashboard + 2-page runbook