Contact Rui Codex
Get a real-time quoteCode-first software engineering from Belgium
Rui Codex is a Belgian software engineering company based in Tielt-Winge (Flemish Brabant), founded in 2026 by Selman Altinay, who brings 12+ years of software engineering experience, 9 of them in C#/.NET. We build business software end to end: web applications and APIs in C#/ASP.NET Core with SQL Server or PostgreSQL, and integrations between systems that don't talk to each other.
What we do:
- Custom software development: web applications, APIs, portals and back-office tools in .NET / ASP.NET Core.
- ERP consulting and integration: modular web ERP, accounting integrations, Odoo implementation and customisation.
- E-commerce development and integration: marketplaces, PrestaShop, accounting and carrier APIs, e-invoices and e-waybills.
- AI development and automation: OpenAI, Azure AI and Claude API integrations, n8n workflow automation.
- Mobile apps: Android and Flutter. Rui Codex also publishes its own apps and games on Google Play.
Delivered work includes a modular web ERP (purchasing, sales, export, finance, warehouse), real-time sync between marketplaces (Trendyol, Hepsiburada, N11) and Netsis accounting with automated e-invoices and e-waybills, a PrestaShop pipeline to accounting and four carriers, PLC/SCADA data collection for a machining facility, and EveryTranslate, our own AI translation SaaS. Case studies: https://ruicodex.com/CaseStudies
How we work: async-first and in writing (English, Turkish, basic Dutch), in short milestones with regular written updates. Work done inside a client's own system (their Odoo, webshop or app) stays there as source code they can use and modify. Rui Codex's own products and reusable components are licensed for use; a source-code buy-out can be quoted on request.
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Min project size
$1,000+
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Hourly rate
$50 - $99 / hr
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Employees
Freelancer
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Year founded
Founded 2026
Service Lines
- AI Development
- 20%
Select Focus Area
- AI Expertise
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- Application Platforms
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- Azure Platform
- 40%
- Windows server
- 35%
- Linux server
- 25%
- AI Technologies & Models
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- Open AI GPT-3
- 60%
- Anthropic
- 40%
- E-commerce Systems
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- PrestaShop
- 60%
- Other ecommerce systems
- 40%
- ERP Solutions
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- Other ERP
- 50%
- ERP Implementation
- 30%
- Odoo ERP Consulting & Implementation
- 20%
- Mobile Focus
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- Consumer Mobile App Development
- 40%
- Mobile Platforms
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- Programming & Scripting
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- C#
- 45%
- ASP.NET
- 25%
- SQL
- 15%
- JavaScript
- 10%
- HTML5
- 5%
Industries
- eCommerce
- 40%
- Business services
- 25%
- Manufacturing
- 20%
- Retail
- 15%
Clients
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