I'm Kayra, a backend & full-stack developer designing scalable, performance-oriented systems in PHP, JavaScript, Java and Node.js — layered architecture, RESTful API design and microservices, with particular attention to MySQL schema design (indexing strategy, normalization trade-offs, query optimization). I build production-grade third-party API integrations (OAuth, JWT auth, rate limiting, proper error handling) and specialize deeply in game server platforms (MTA, FiveM): low-latency event-driven systems, real-time data sync, and custom high-concurrency modules (economy/inventory systems, security layers).
Currently:
- Backend systems & game-server tooling @ S16 Bilişim — performance profiling and load balancing built into system design from day one
- Founder (since July 2026) of VitrinX — an ecosystem for business visibility: ad marketplace, business directory, smart search infrastructure
- Hosting & infra consulting @ Berilis Hosting — VDS/VPS process management (PM2, systemd) and deployment automation
Previously: CEO @ Ocean Bilişim — technical leadership across product architecture, infra scaling, uptime optimization, monitoring and failover.
Comfortable with Linux server administration, Git-based version control and cloud infra, and used to owning a project end-to-end from requirements to production. 18 years old, working on real production systems.
Also ships 12+ zero-dependency vanilla JS tools at kasapdev.github.io and 12 TypeScript repos of AI-agent tooling, dev CLIs, automation bots and Roblox/Godot utilities as open source — see below.
Open to collaboration, projects or career opportunities.
Beautify, minify & validate JSON instantly - with syntax highlighting, tree view and zero setup.
The tool I personally reach for the most, and the one most developers will find useful daily.
Every project is standalone, dependency-free, and runs 100% offline. Built with pure HTML, CSS & Vanilla JS.
Productivity Tools
| Tool | What it does | Live |
|---|---|---|
| Password Generator Pro | Cryptographic passwords with live entropy analysis | Demo - Code |
| QR Generator Pro | QR codes for URL, WiFi, email & SMS - PNG & SVG | Demo - Code |
| JSON Formatter Pro | Beautify, minify & validate JSON with highlighting | Demo - Code |
| Color Palette Generator Pro | HEX / RGB / HSL palettes with harmony modes | Demo - Code |
| Pomodoro Timer Pro | Focus timer with SVG ring, streaks & stats | Demo - Code |
| Markdown Notepad Pro | Live markdown editor with multi-note manager | Demo - Code |
Discord & FiveM Tools
| Tool | What it does | Live |
|---|---|---|
| Discord Embed Builder Pro | Visual Discord embed designer + webhook JSON | Demo - Code |
| FiveM Command Builder Pro | Generate Native / QBCore / ESX Lua commands | Demo - Code |
Site & Page Builders
| Tool | What it does | Live |
|---|---|---|
| Maintenance Page Pro | Design & export "under maintenance" pages | Demo - Code |
| Status Page Pro | Self-hosted service status dashboard | Demo - Code |
| Coming Soon Builder Pro | Launch countdown pages with email capture | Demo - Code |
| Error Page Builder Pro | Craft & export gorgeous 404 / 500 pages | Demo - Code |
Bundled monorepo of the first 8 tools: kasapdev/web-utility-suite
Developer Utilities
| Tool | What it does | Live |
|---|---|---|
| Regex Tester Pro | Live regex matching, capture groups & replace preview | Demo - Code |
| Cron Expression Builder Pro | Visual cron builder with plain-English explanation | Demo - Code |
| Diff Checker Pro | Line & word-level text/code diff, side-by-side or unified | Demo - Code |
| JWT Decoder Pro | Decode & inspect JWT header/payload/claims | Demo - Code |
| Hash Generator Pro | MD5/SHA-1/256/384/512 for text & files | Demo - Code |
| UUID / ULID Generator Pro | Bulk UUID v4 & ULID generation | Demo - Code |
| CSV ⇄ JSON Pro | Bidirectional CSV/JSON converter with type inference | Demo - Code |
| Gitignore Generator Pro | Merge curated .gitignore templates for 20+ stacks |
Demo - Code |
| License Picker Pro | Compare & generate real OSS license text | Demo - Code |
| README Generator Pro | Build a README with badges & live preview | Demo - Code |
| Text Case Converter Pro | camelCase / snake_case / kebab-case & more, live | Demo - Code |
Design & Assets
| Tool | What it does | Live |
|---|---|---|
| CSS Gradient Generator Pro | Multi-stop linear/radial/conic gradient builder | Demo - Code |
| Favicon Generator Pro | Full favicon set (16-512px) from one image | Demo - Code |
| SVG Optimizer Pro | Client-side SVG minifier with before/after preview | Demo - Code |
| Base64 Image Converter Pro | Image ⇄ base64 data URI, both directions | Demo - Code |
| ASCII Art Generator Pro | Text-to-banner ASCII art, 3 font styles | Demo - Code |
Documents & Productivity
| Tool | What it does | Live |
|---|---|---|
| Invoice Generator Pro | Line-item invoices with print-to-PDF | Demo - Code |
| Resume Builder Pro | CV builder with 2 themes & print export | Demo - Code |
| Changelog Generator Pro | Keep-a-Changelog-format entry builder | Demo - Code |
| Meta Tag Generator Pro | SEO/OG/Twitter meta tags with live social previews | Demo - Code |
| Countdown Widget Pro | Themed countdown + embeddable HTML snippet | Demo - Code |
| Unit Converter Pro | Length/weight/temp/area/volume/data-storage | Demo - Code |
| Timezone Converter Pro | Multi-timezone converter + meeting planner | Demo - Code |
| Lorem Ipsum Generator Pro | Placeholder text, classic & themed word banks | Demo - Code |
Discord & Game Server
| Tool | What it does | Live |
|---|---|---|
| Discord Webhook Tester Pro | Visual embed builder that sends real test payloads | Demo - Code |
| Minecraft MOTD Generator Pro | §-code MOTD builder with server-list preview | Demo - Code |
A separate suite of real, working TypeScript/Node tools — Claude-agent apps, CLIs, SDKs and bots. pnpm workspaces, MIT licensed, CI on every repo.
| Repo | What it does |
|---|---|
| kasap-ai-tools | Shared Claude-agent core + Discord support bot, Roblox/Godot design assistant, logistics SDK, e-commerce listing optimizer, PDF invoice extractor, LLM cost tracker |
| kasap-dev-cli-tools | repo-health-cli, commitlint-tr, env-doctor, pkg-bloat, changelog-gen |
| kasap-api-sdk-kit | Typed SDK clients: Steam Market, Discord webhooks, Twitch clips, Roblox Open Cloud, Godot Asset Library |
| kasap-automation-bots | eBay price watcher, uptime bots, domain/SSL expiry notifier, issue triage, Discord ticket/economy bots |
| kasap-roblox-godot-tools | Luau formatter, save inspector, DataStore backup, anti-cheat heuristics, analytics SDK, dialogue editor |
| kasap-hosting-infra-tools | Uptime dashboard, cPanel migration helper, SSL renewal watcher, nginx config linter |
| kasap-logistics-tools | Fleet fuel tracker, route cost calculator, CMR parser, customs tariff lookup, carrier tracking |
| kasap-dev-productivity-tools | Encrypted dotfiles sync, snippet vault, PR size labeler, stale-branch reporter |
| kasap-quality-tools | Flaky test detector, API contract diff, seed data generator, load-test tool |
| kasap-security-tools | Git secret scanner, rate-limit middleware kit, CORS config auditor |
| kasap-data-viz-tools | CSV-to-dashboard, log parser/summarizer, JSON Schema diff visualizer |
| kasap-profile-tools | Curated awesome-list + the GitHub Action that regenerates this profile |
"The best tool is the one that gets out of your way."
Scalable systems by day - Zero-dependency tools by night