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SmartyDevs
Engineering · 06

APIs your customers actually want to use.

Public APIs, internal services, GraphQL and REST done correctly — versioned, paginated, idempotent, well-documented and observable. Plus the SDKs that turn them into a developer experience.

§ 01The problem

The problem we solve

Most APIs are an accident of internal endpoints exposed to customers. Inconsistent pagination, opaque errors, breaking changes shipped without notice, no SDK, no documentation worth reading. A real API is a product. We build it like one — with semantics, versioning, observability and developer experience as first-class concerns.

§ 02Capabilities

What we ship

  • 01REST APIs with sensible verbs, status codes and pagination
  • 02GraphQL APIs with persisted queries and proper schema design
  • 03Versioning, deprecation paths and breaking-change discipline
  • 04Idempotency, retries and webhook delivery with proper guarantees
  • 05Rate limiting, API keys, scoped tokens and OAuth where needed
  • 06Auto-generated, hand-edited OpenAPI documentation
  • 07SDKs in TypeScript, Python and Go from a single source of truth
  • 08API analytics: who calls what, how often, with which latency
  • 09Backwards-compatible evolution patterns
  • 10Sandbox environments and developer dashboards
§ 03Deliverables

What you receive

  • Production API with documentation and SDKs
  • Versioning and deprecation policy written down
  • Per-endpoint analytics dashboard
  • Developer experience that doesn't embarrass you
§ 04Stack

Stack we reach for

Node.js · Python · Go
OpenAPI 3.1
GraphQL · Apollo
Postgres
Stainless · Speakeasy SDK generation
Inngest · Temporal
Cloudflare · AWS API Gateway
Mintlify · Scalar
§ 05Ideal for

Ideal for

  • Companies graduating an internal API into a product surface
  • Platforms whose developer experience is becoming a competitive moat
  • Marketplaces needing partner API integration
  • Products acquiring complexity faster than the API can absorb
§ 06Process

How an engagement runs

  1. 01

    Schema design

    We design the API on paper first. Resources, verbs, errors, versioning. Reviewed by people who'll integrate it.

  2. 02

    Implementation

    Implementation against the schema. OpenAPI generated, SDKs generated from it. Single source of truth.

  3. 03

    Documentation

    Hand-edited docs that go beyond the auto-generated reference. Examples, error catalogs, integration guides.

  4. 04

    Launch & analytics

    Public release with per-endpoint analytics and a deprecation policy your team can actually maintain.

§ 07Engagement

How to engage

01

API Audit

1 — 2 weeks

Review of your current API surface with a prioritized list of issues and migration path.

02

Greenfield API

6 — 12 weeks

New API designed and shipped end-to-end, including SDKs and documentation.

03

API Renovation

8 — 16 weeks

Versioning, deprecation and re-architecture of an existing API without breaking integrations.

§ 08Common questions

Frequently asked.

01REST or GraphQL?

Depends on the audience. Public APIs aimed at integrators usually want REST + OpenAPI. Internal product surfaces with rich client UIs benefit from GraphQL. We will tell you which fits your case.

02Do you generate SDKs?

Yes — from OpenAPI or GraphQL schemas, using Stainless or Speakeasy. We hand-edit where the auto-generated code falls short.

03Can you migrate us off a homegrown API?

Yes. We design the new surface, run both in parallel, migrate clients with a deprecation timeline, and retire the old one safely.

Have a problem worth solving well?

Tell us the outcome you want. We'll tell you what it takes — honestly, within a week, in writing.

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