Kalenux is a software company based in Istanbul. We build and maintain web platforms, Android apps, and developer tools - all publicly available and used by real people every day.
From editorial platforms to mobile utilities - real products with real users, running in production every day.
whennotesfly.com
High-traffic editorial magazine covering thinking, learning, technology, and culture across 6 topic categories and 60+ subtopics. Built with Go, PostgreSQL, Redis, and Docker for reliable performance under load.
Multilingual IQ testing platform measuring 10+ cognitive domains. Detailed score breakdowns, percentile rankings, and adaptive difficulty for a global audience.
30+ format file converter running 100% client-side. No uploads, no servers, no registration. Images, documents, audio, and video processed entirely in-browser via WebAssembly.
Generate and scan QR codes and barcodes supporting QR, Code 128, EAN, UPC, and Data Matrix. Custom styling, camera scanning, CSV batch mode. Works offline as a PWA.
From single-page apps to complex multi-service architectures - we cover the full stack and own every part of the process.
Full-stack web apps from landing pages to complex SaaS platforms. React, Next.js, Go, Node.js — production-grade architecture from day one.
Android native and cross-platform apps with 5 published titles on Google Play. From UI design to Play Store submission and post-launch support.
Scalable backend systems and REST APIs built to handle real production workloads. PostgreSQL, Redis, Docker, and cloud deployment on AWS or GCP.
Architecture reviews, code audits, and technical direction at any stage. Expert guidance before you scale into expensive problems.
You talk directly to the engineers writing your code — no account managers, no outsourcing.
Full stack developer, mobile app builder, and tech entrepreneur from Istanbul. Emir founded Kalenux after years of building products that actually get used - from high-traffic editorial platforms to utility apps with thousands of downloads.
The team works across the full stack: Go, React, Node.js, Python, Java/Kotlin for Android, PostgreSQL, MongoDB, Redis, Docker, AWS. Whatever the project needs, we build it right.
Emir also built Kalenuxer - an open-source Node.js website build framework that powers all Kalenux web properties. With 5 Android apps published on Google Play and over 5 years of product development, Kalenux handles everything from system architecture and database design to UI, deployment, and ongoing maintenance.
A Node.js-based website build system powering all Kalenux projects. Template-based, multilingual, incremental builds, and automated deployment - built in-house because nothing else did everything we needed.
Only rebuilds changed files - CSS, JS, and HTML are tracked separately with timestamp-based invalidation. On large sites this cuts build time from minutes to seconds.
Built-in i18n with JSON data files per language, supporting 15+ languages without any external dependency or translation service. Adding a new language is a matter of adding a JSON file.
Component includes, variable substitution, and automatic minification are all built in with no plugin configuration required. Reuse headers, footers, and any partial across an entire site from a single source file.
SSH/SCP deployment scripts handle build, sync, and ship in a single command - with separate modes for frontend-only changes and full container rebuilds. No CI service required for small teams.
Kalenuxer-built frontends integrate natively with Go backend templates, allowing server-side rendering with Go's html/template package alongside the static build pipeline. This makes it straightforward to mix static pages with dynamic, data-driven routes.
Every number below is a live product in production - not a demo, not a prototype.
Kalenux is the company behind these products. Everything listed here is live, publicly accessible, and built entirely in-house. No outsourcing, no white-labelling.
Using one of our apps or products and need help? Want to report a bug, request a feature, or just find out who is behind the software? We read every message.
Direct contact with the developer - no support ticket system, no bots.