Custom API Development for Companies That Need More Than Zapier

Zapier, Make, and Workato are great until they are not. A single failed webhook silently drops a customer record. A schema change at the vendor breaks the flow at 3am and your ops team finds out from a customer support ticket. The retries pile up. The execution costs climb past what a junior engineer would cost. Meanwhile your real integration logic — the part that actually maps your business rules onto a third party's data model — lives in twelve different zaps that no one understands.

Custom API development is what happens after that. A versioned, documented, monitored set of endpoints that your team owns. Webhooks that are idempotent, retried with exponential backoff, and audited. Integrations that survive vendor API changes because we pin versions and review changelogs. APIs that handle the long tail of edge cases the no-code layer was never designed for.

API design starts with the contract, not the code. Discovery produces an OpenAPI 3.1 specification that the consumers can mock against before a single endpoint is built. From there we generate types for both server and client, build the implementation, and run contract tests on every commit. The documentation is not an afterthought — it is the source of truth that everything else is generated from.

Two-week discovery → contract design → phased build (4 to 12 weeks typical) → consumer onboarding with documentation and sandbox keys. You own the source code, the spec, the deployment, and the audit trail.

API and integration work shows up in every project we ship. Bridgepointe Painting runs on a custom Stripe + QuickBooks Online sync API that closed month-end from three days to thirty minutes. J5 Sales OS wires Apify, Apollo, Stripe, and QuickBooks behind a unified internal API. A contractor estimating engine exposes proposal generation through both an internal REST API and a partner-facing GraphQL endpoint.

Every API we ship survives the things that break integrations in practice — vendor API version changes, rate-limit storms, replay attacks, and the inevitable webhook that fires three times at once.

API development served from Macon, GA, with clients across Atlanta, New York, San Francisco, and the rest of the US.

Fixed-fee per scope. Typical ranges:

• Single integration (Stripe ↔ QuickBooks, HubSpot ↔ internal DB): $8k – $18k
• REST or GraphQL API for an existing product: $15k – $40k
• Full developer-facing API with portal, OAuth, rate limiting, billing: $30k – $75k
• Webhook ingestion service with retry, replay, audit, and admin UI: $12k – $28k
• Discovery sprint with OpenAPI contract: $2,500 flat

30-day post-launch support included. Optional monthly retainer for continued feature work and integration additions.