The latest articles on DEV Community by Konstantin Tachkov (@konstantin_tachkov_40ebda). https://dev.to/konstantin_tachkov_40ebda https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3947147%2F43bc9021-6ee6-4aa1-ae55-d1d4b77176cc.png https://dev.to/konstantin_tachkov_40ebda en Konstantin Tachkov Sat, 23 May 2026 22:49:40 +0000 https://dev.to/konstantin_tachkov_40ebda/manage-your-health-with-gp-online-h09 https://dev.to/konstantin_tachkov_40ebda/manage-your-health-with-gp-online-h09 <p><a href="https://dev-to-uploads.s3.amazonaws.com/uploads/articles/5klkifd1oa3payfmlsxe.png" rel="noopener noreferrer">Image description</a></p> <p>!This is a submission for the <a href="https://dev.to/challenges/google-gemma-2026-05-06">Gemma 4 Challenge: Build with Gemma 4</a></p> <h2> What I Built </h2> <p>Healthcare is one of the largest consumers of SaaS products, comprising roughly 15%–18% of the overall global SaaS market and growing at a CAGR of 15%–20%.</p> <p>Despite the abundance of software, most of it targets high-volume paying customers through complex enterprise information systems (60%–70%), leaving a significant market gap for patient-facing or GP-facing tools.</p> <p>This issue is acutely felt in Europe, where health SaaS adoption sits at approximately 18% — and significantly lower in central and eastern Europe.</p> <p>Booking a GP appointment is a prime example. Many patients in Bulgaria resort to calling the doctor personally to arrange a visit, while a single GP can manage upwards of 2,000 patients.</p> <p>I wanted to simplify this process by building a web app that syncs with patient and doctor calendars and offers a seamless, real-time booking option. The app was built in English for the purposes of the competition.</p> <h2> Demo </h2> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code>https://youtu.be/EaOodungK8g </code></pre> </div> <h2> Code </h2> <p><a href="https://github.com/ktashkov-jpg/gp-online-en" rel="noopener noreferrer">GitHub Repository — ktashkov-jpg/gp-online-en</a></p> <h2> How I Used Gemma 4 </h2> <p>I used Google AI Studio with the Gemma model for the full experience. The initial prompt was designed around three constraints: the app targets the Bulgarian healthcare market, GPs are listed in a public registry with open Swagger documentation, and since calendar syncing requires OAuth, a demo mode should be available for immediate testing without setup.</p> <h3> Initial Prompt </h3> <div class="highlight js-code-highlight"> <pre class="highlight plaintext"><code>I need an app which would allow patients to easily book appointments with their general practitioners (GPs) in Bulgaria. These practitioners often have more than a thousand patients, sometimes up to 2,000. The app should sync with Google Calendar, Outlook Calendar, or any other native calendar. When an appointment is booked, the app should check real-time availability and alert both patient and doctor. Every Sunday, the app should notify the doctor about upcoming appointments and reasons (e.g. "Monday: 3 appointments"). Consider adding a mock patient/doctor for dashboard inspection. </code></pre> </div> devchallenge gemmachallenge gemma