AP-01
Payment & Subscription APIs
Stripe, PayPal, Shopify Payments. Webhooks, idempotent charge flows, subscription lifecycle handling, refunds, and dispute hooks.
StripeSubscriptionsWebhooks
Sheet · APIs
Service · API Integrations
APIs that actually hold.
Custom integrations between the systems your business depends on — built with retries, idempotency, and observability, so the middleware stays quiet.
Sheet 01 · Overview
Integrations should not be the fragile part of your stack.
Most “the integration is down” Slack messages are not actually integration bugs — they are missing retry logic, missing idempotency keys, unhandled rate limits, or schema drift no one validated against.
We design integrations that assume the network is unreliable, the upstream API is sometimes wrong, and your business cannot tolerate a duplicate charge or a missed webhook. Queued inbound events, signed payloads, dead-letter queues, and audit logs are the baseline, not the bonus.
Whether you need to wire Stripe and Klaviyo into Shopify, sync a Notion database into a customer dashboard, or build a middleware layer between an internal ERP and a customer-facing app — we have shipped it.
Sheet 02 · Schedule of Capabilities
Capabilities delivered.
6 core areas
Scoped per brief
Scoped per brief
AP-02
Marketing & CRM
HubSpot, Klaviyo, Mailchimp, Salesforce, Pardot. Bidirectional sync, list segmentation, custom properties, and lead routing.
HubSpotKlaviyoSalesforce
AP-03
Commerce APIs
Shopify Admin and Storefront APIs, Shopify Plus Flow, multipass, bulk operations, and headless storefront wiring.
Shopify AdminStorefrontPlus Flow
AP-04
Search & Content
Algolia, Meilisearch, Notion API, Storyblok, Sanity — indexed, ranked, and surfaced as fast as the network allows.
AlgoliaNotionSearch
AP-05
Messaging & Comms
Mailgun, SendGrid, Twilio, Slack, Discord. Templated transactional mail, SMS confirmations, and team notifications.
MailgunTwilioSlack
AP-06
Custom Middleware
Bespoke Node.js services that sit between systems — translating, queueing, caching, and persisting state when the upstream cannot.
Node.jsQueuesMiddleware
Sheet 03 · Process
How we wire it.
- Phase 01
Discovery
Audit every system in the loop, document the data flow, identify the failure modes. Output: an integration brief and a sequence diagram.
- Phase 02
Contract & schemas
Define request/response schemas, webhook signatures, retry policy, and error taxonomy before writing implementation code.
- Phase 03
Build & test
Implement with structured logging, idempotency keys, and queueing. Stress-test against rate limits and known failure cases.
- Phase 04
Operate
Dashboards for inbound and outbound traffic, alerts on dead-letter growth, scheduled reviews of integration health.
Sheet 04 · Stack
Tools we reach for.
Node.jsTypeScriptExpressGraphQLBullMQRedisStripeKlaviyoHubSpotSalesforceShopify Admin APIShopify Storefront APINotion APIAlgoliaTwilioMailgun
Sheet 05 · FAQ
Questions, answered.
What kinds of APIs do you integrate?
Anything with a documented interface — Stripe, Klaviyo, Shopify Admin & Storefront, HubSpot, Salesforce, Notion, Algolia, Mailgun, Twilio, internal ERPs, custom partner APIs. We also write APIs from scratch when the right one does not exist.
Do you build middleware between systems?
Yes. Often the right move is not "integrate A and B directly" but "build a thin middleware layer that both A and B talk to," because it scales to a third and fourth integration cleanly.
How do you handle webhook reliability?
Signature verification, idempotency keys, queueing inbound webhooks, and retries with exponential backoff. We treat webhooks as untrusted, asynchronous, and possibly duplicated by default.
What about REST vs GraphQL?
We use both — REST for simple, cache-friendly endpoints and webhooks; GraphQL where the client benefits from selective field fetching (Shopify Storefront API, complex dashboards). The choice follows the use case.
Can you fix flaky integrations we already have?
Frequently. Most "integration is broken" tickets are missing retry logic, missing idempotency, missing schema validation, or unhandled rate limiting. We audit, harden, and document.
Sheet 07 · Start a brief
Wire it once. Right.
Tell us which systems need to talk and what is breaking today. We'll come back with a sequence diagram and an integration plan.