Hakan Sevimoğlu Hakan SevimoğluFreelance Developer · 18 yrs
Sell your car · Offer · Inspection · Payment

Car Buying Platform Software: Turn Sellers into Offers and Offers into Sales

I build sell-your-car platforms for used-car buying companies and dealerships, where users value their car online, receive an offer, book an inspection and complete the sale.

Quick answerCar buying platform software is a web and mobile platform where people who want to sell their car get an online valuation, receive a price offer from the business, book an inspection appointment and track the sale and payment steps. Hakan Sevimoğlu developed OtoSeimen (otoseimen.com), a car valuation and selling platform that includes this flow.

Written by Hakan Sevimoğlu · Last updated:

The sell-your-car flow

  1. Valuation: the user values their car in a few steps and sees the estimated value
  2. Offer: an offer is generated based on the business's rules; the user accepts it or gets in touch
  3. Inspection: an inspection appointment is booked by choosing a suitable branch and time
  4. Final price: the offer is updated based on the inspection result
  5. Sale and payment: document, notary and payment steps are tracked and the user is kept informed

Details that boost conversion

  • A valuation form that starts right on the homepage
  • The ability to return to an unfinished valuation
  • Free valuation, with a clear statement that there is no obligation to sell
  • Instant contact via WhatsApp and phone
  • Offer and appointment reminders (SMS / email / WhatsApp)
  • SEO-friendly structure with city and make/model pages

Personal data is processed in compliance with KVKK (Turkish data protection law), and explicit consent is obtained. Payment and ownership transfer processes are designed in line with current regulations (notary, payment institution); the platform tracks these steps and keeps the user informed. Valuation infrastructure: car valuation software.

What I offer

  • Sell your car form

    Valuation that starts from the homepage.

  • Offer management

    Automatic or approved offers.

  • Inspection

    Branch and time selection.

  • Sale tracking

    Document and payment steps.

  • Notifications

    SMS, email, WhatsApp.

  • SEO

    City and make/model pages.

Technologies I use

PHP 8PDOMySQLJavaScriptREST APIWhatsAppSMS APISchema.org

Example projects

A selection of live projects serving real users.

How we work

  1. Free intro call

    We clarify needs, existing systems and goals together.

  2. Quote & roadmap

    Scope, technology, timeline and budget within 24 hours.

  3. Staged development

    Weekly demos and a live test environment.

  4. Launch & support

    Go-live, training and ongoing maintenance.

Free pre-analysisThe first meeting and roadmap are completely free, with no obligation.

Staged delivery and approvalYou review each module on a test environment before we move on.

Written scope and rightsScope, delivery and source code rights are defined in the contract.

Frequently asked questions

How does a car buying platform work?

The user values their car online, receives an offer and books an inspection appointment; after inspection the final price is set and the sale steps are tracked through the platform.

Can it be set up for our dealership?

Yes. The platform is set up with your dealership's brand, domain name, buying rules and branches.

Will there be a mobile app?

Yes. In addition to the web platform, iOS and Android apps can be developed.

Have you built a similar project?

Yes. I developed the OtoSeimen platform, which includes valuation, offer, inspection and sale steps.

WhatsAppFree Quote