Qkoh St
ID EN
RESTful API Development

APIs with a clear contract, ready for another team to use

When one system needs to serve several applications — web, mobile, or third-party systems — the API is what connects them. I build RESTful APIs with consistent endpoint structure, uniform response formats, and clear error handling.

Every API I hand over comes with documentation covering the endpoint list, parameters, sample requests, and sample responses — so another team can start using it without guesswork.

I also handle authentication, per-role access control, and adding an API layer to systems that are already running but have no programmatic interface.

Discuss your needs

Process

How I work

  1. 01

    Consultation

    Mapping out your needs, workflow, and the goals you want to reach.

  2. 02

    Design

    Structuring the data, the page flow, and the interface.

  3. 03

    Build

    Developed in stages, with progress you can review along the way.

  4. 04

    Handover

    Deployment, a usage walkthrough, and follow-up support.

Pricing

Packages and indicative pricing

The prices below are starting points and adjust with the scope of work. Get in touch for a quote that fits your needs.

  • Basic

    Starting from

    $120

    Rp2.100.000 · per project

    A simple website or application with its data management.

    • About 6 working days
    • 2 revisions
    • Content upload
    • Responsive design
    • Design customization
    Request a quote
  • Premium

    Starting from

    $758

    Rp13.300.000 · per project

    A bespoke system with features shaped around your requirements.

    • About 30 working days
    • 6 revisions
    • Content upload
    • Responsive design
    • Design customization
    • Source code included
    Request a quote

Rate 1 USD ≈ Rp17.603 as of 11 September 2026

Contact

Contact

Got a project or a question? Reach me through any of the channels below.