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API & SDK Integration

Third-party APIs and SDKs connected to your product, and kept working.

We integrate the external services your roadmap depends on: payment and billing platforms, telephony, AI providers, and partner APIs. Built with queues, retries, and monitoring, so a slow or failing service on their side does not take yours down.

What we build

Third-party API integration

Authentication, rate limits, pagination, and error handling done properly, wrapped in a client your team can maintain.

SDK integration

Vendor SDKs added to your backend, with configuration, keys, and the upgrade path documented.

Webhooks and event flows

Incoming events verified and processed through RabbitMQ and Celery with retries, so nothing is lost when a service is slow.

Data sync between systems

Records kept consistent between your database and an external service, with reconciliation for when they drift apart.
Stack, and why
Python, FastAPI and Django
Integration clients and the endpoints that receive events.
RabbitMQ and Celery
Background calls and webhook processing with retries and scheduling.
Postgres
A record of what was sent, received, and synced.
Redis
Rate limiting, caching, and short-lived state.
Proof, not promises
AI Support Agent · E-commerce60% faster support response with an AI agentA conversational agent with tool calling that handles support chats and return requests end to end.Read the case study →Voice AI · Fintech−35% call center load with a voice loan assistantA voice agent that handles first-line loan application calls before handing off complex cases to a human.Read the case study →
Proxy serviceA proxy service, built end to endFull-cycle backend for a proxy service: payment gateway and subscription billing integrations, SDK integrations, and the service logic in between. Client name withheld at their request.
PythonPostgresPayment gatewaysSubscription billingSDKs
How a project runs
  1. 1
    Call
    A short call about what needs to be built or connected, and why it matters to your product.
  2. 2
    Discovery sprint
    We map your systems, the external APIs, and the risks, then give you a range of hours.
  3. 3
    Build in short iterations
    Working pieces in your environment as we go, not a big reveal at the end.
  4. 4
    Launch and after
    Release with monitoring, then a handover to your team or ongoing support on the Scale tier.
How we bill

Hourly or monthly. Never a fixed price per project.

Hourly or a monthly block
You pay for the hours we work, or a fixed monthly amount for a reserved block of hours. Either way, you can scale up or down between months.
Why no fixed project price
Integrations always hide surprises: an undocumented rate limit, a webhook that fires twice, data that does not match between systems. A fixed price means either padding it for every risk or cutting corners when one shows up. We estimate a range of hours instead and revise it as we learn.
Starting small
A short call, then a discovery sprint to map your systems, the third-party services, and the risks before anyone commits to an estimate.
Engagement tiers
FeatureStarterGrowthScale
Discovery sprint✓✓✓
Dedicated engineer—✓✓
Production on-call——✓
Weekly engagement—20 hrs40+ hrs
Further reading
Integrating an AI Agent With Your Order and Returns APIsHow Confidence-Based Escalation Works in AI Support AgentsFunction Calling vs Chatbots: Why It Matters for SupportWhat Does an AI Support Agent Cost to Build vs License?How a Low-Latency Voice AI Assistant Is ArchitectedFunction Calling on a Live Call: Keeping Lookups Under the Conversation Budget
FAQ
What happens when the external API changes or goes down?

Calls go through one client with timeouts, retries, and alerts, and slow work moves to a background queue. When the vendor changes their API, there is one place to update.

Do you work inside our existing codebase?

Yes. We embed alongside your engineers and work in your repository, your environments, and your review process.

Can you integrate a service that has poor documentation?

Usually. We start with a short spike against the real API to find the undocumented behaviour before estimating the full integration.

How do you price it?

Hourly or as a monthly block of hours. We do not quote a fixed price per project, because external APIs rarely behave exactly as documented.

Other services
AI IntegrationPayments & SubscriptionsBackend Development

Tell us what needs connecting.

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