Klikcy

API Development

We design and build APIs, the connections that let your software talk to other software, plus the integrations between the tools you already use.

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At a glance

App & Software

Timeline
A focused API or integration typically takes 2 to 8 weeks.
You get
  • API design and specification (OpenAPI)
  • REST or GraphQL implementation
  • Authentication, authorization, and rate limiting
Tools
Node.js and TypeScript, Python with FastAPI, OpenAPI, GraphQL
Price
A fixed, written quote. Free to ask.

Page reviewed October 2026

What this covers

APIs are behind most modern business software. Your website talks to your CRM, your app talks to your database, your partners pull your product catalog. When APIs are poorly designed, every new integration becomes a custom project and every change risks breaking something downstream.

We build APIs that are predictable: consistent naming, clear errors, versioning so changes don't break existing users, authentication appropriate to who's calling, and rate limits that protect your systems. Documentation is generated from the code, so it stays accurate.

We also integrate third-party APIs, like payment providers, shipping carriers, CRMs, accounting systems, and AI models, handling the unglamorous parts like retries, webhook verification, and what happens when the other side is down.

Is this right for you?

You'll get the most out of it if any of these sound familiar:

  • Your systems need to share data and currently do it through exports.
  • Partners or customers want programmatic access to your data.
  • You're building a mobile app or front end that needs a backend.
  • An existing integration breaks regularly.

What you get

Included in a typical engagement:

  • API design and specification (OpenAPI)
  • REST or GraphQL implementation
  • Authentication, authorization, and rate limiting
  • Webhooks and third-party integrations
  • Automated tests
  • Generated documentation

How it works

A focused API or integration typically takes 2 to 8 weeks.

  1. Design

    We agree on resources, endpoints, and data formats before writing code.

  2. Build

    Implementation with tests for each endpoint and integration.

  3. Secure

    Auth, permissions, input validation, and rate limits checked.

  4. Document and deploy

    Documentation, monitoring, and deployment to your infrastructure.

What affects the price

Every quote is fixed and written down before work starts. These are the things that move it:

  • Number of endpoints and integrations
  • Third-party API quality and documentation
  • Security requirements
  • Performance and volume needs

Mistakes we plan around

The problems we see most often when this work is rushed:

  • No versioning, so every change breaks someone.
  • Trusting webhook payloads without verifying the signature.
  • Ignoring rate limits and failure handling for third-party APIs.

API Development questions

REST or GraphQL?

REST for most public and partner APIs because it's simple and widely understood. GraphQL when front ends need flexible queries across a lot of related data.

Can you integrate with a system that has poor documentation?

Usually. It takes longer and involves more testing, and we'll warn you upfront if an integration looks unreliable.

How do you secure an API?

Appropriate authentication (API keys, OAuth, or tokens), permission checks on every request, input validation, rate limits, and logging. We also review what data each endpoint exposes.

Do you provide documentation?

Yes. Documentation is generated from an OpenAPI specification, so it matches the actual API.

Services clients commonly combine with this one.

  • Web App Development

    Browser-based applications for customers or staff, from first version to production.

  • Database Architecture

    Database design, performance tuning, and migrations that keep your application fast as it grows.

  • MCP Integrations

    Model Context Protocol servers that let AI assistants use your business tools and data safely.

  • Workflow Automation

    Connect your apps so data moves between them automatically instead of by copy and paste.

Want a quote for this?

A few sentences is enough. We'll reply within one business day with questions or a suggested next step, and a fixed quote once the scope is clear.

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What you can count on

  • A fixed, written quote before any work starts
  • Code, domain, hosting, and analytics in your name
  • A progress update every week during projects
  • Monthly plans that run month to month
  • A reply within one business day