Saturn, Milky Way, Universe 🪐

Kader Kaya

BACKEND DEVELOPER

Backend Developer with 1 year experience in building scalable and secure web applications using Node.js, TypeScript, and MongoDB. Experienced in designing RESTful APIs, implementing JWT-based authentication, role-based access control (RBAC), payment integrations, and Swagger/OpenAPI documentation. Passionate about clean architecture, microservices, and writing maintainable, testable backend systems, with strong collaboration skills developed through community involvement at GDG.

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Latest Experience

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BACKEND DEVELOPER

Bulbi · 06/2025 — 10/2025

Featured Projects

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Portfolio Web & CMS Platform

Modern developer portfolio and single-user CMS platform built with Next.js (App Router) and TypeScript, featuring a clean CV-style public interface and a private admin panel for full content management. Powered by a custom Node.js backend API (see Portfolio Backend API project).

Next.jsTypeScriptTailwindCSSCMSAdmin PanelApp Router

Portfolio Backend API

Custom RESTful API built with Node.js and Express to power a single-user portfolio CMS system, designed with clean architecture principles and scalable data modeling. Designed to serve the Portfolio Web & CMS platform frontend.

Node.jsExpressREST APIClean ArchitectureJWT

Resify Express

Lightweight Express middleware library published on npm, designed to standardize API responses and centralize error handling, improving consistency and developer experience across Node.js applications.

Node.jsExpress.jsTypeScriptNPM PackageMiddlewareREST APIBackendError HandlingAPI DesignDeveloper ToolsOpen Source

History Hub

Modern “On This Day” history platform built with Next.js and TypeScript, delivering a smooth, scroll-based user experience for exploring historical events. Designed with a focus on performance, clean UI, and structured data presentation.

GoGin

Social Graph Analyzer

A scalable full-stack application that analyzes GitHub followers and following lists to detect non-reciprocal relationships, built with a modular Node.js backend and a clean Next.js frontend, optimized with linear-time comparison and rate-limit aware design.

NodejsAnalyzerRedis

E-Commerce API

Scalable e-commerce backend built with Node.js, Express, Sequelize, and MySQL, featuring JWT authentication, asynchronous order processing, and a port-based architecture ensuring clear service boundaries.

Node.jsMySQLSequelize

Task Tracker API

A modular task management system developed with NestJS, Prisma, and PostgreSQL, supporting RBAC, email reminders, and clean architecture principles for maintainable backend design.

Nest.jsPrismaPostgreSQL

Blog Management API

TypeScript-based blog API using Node.js and MongoDB, implementing JWT authentication, media uploads, rate limiting, and structured logging with a strong focus on security and scalability.

TypeScriptMongoDB

Chat Backend API

Chat backend built with PHP 8.1, Slim 4, and SQLite, enabling token-based public group messaging with a clean layered architecture, indexed pagination, structured logging, and automated tests for reliability.

PhpSlimSQLite

Writing

All Articles

Good APIs Don’t Return Data. They Tell the Client What To Do

Designing response contracts that eliminate guesswork in the frontend

Idempotency Beyond Theory

What Actually Breaks When Duplicate Requests Hit Your Backend

Designing “Who Unfollowed Me?” for Scale and Stability

A deep dive into building a scalable and stable “Who Unfollowed Me?” analyzer, focusing on pagination, rate limiting, and algorithmic efficiency. This article explores how a modular Node.js backend and an optimized O(n) comparison strategy create a production-ready foundation for handling large-scale social graph data.

Escalating the Social Graph: Solving Timeouts and Rate Limits with Redis and BullMQ

Scaling follower analysis from small accounts to users with 100k+ followers introduces challenges like HTTP timeouts and API rate limits. This article explores how a Redis + BullMQ powered background job architecture transforms the system into a resilient, asynchronous service with real-time progress tracking.

Isolation Levels and Read Anomalies

A clear, practical overview of how isolation levels shape transaction behavior, explaining dirty reads, non-repeatable reads, and phantom reads with real-world examples—while highlighting the balance between data consistency and system performance in modern applications.

Same Product, Two Backends: Node.js vs Go in a Real Project

A hands-on comparison of Node.js and Go built on the same product, revealing how different backend choices shape performance, scalability, and engineering mindset—showing that real-world results depend more on implementation than the language itself.