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Selman Altinay

@selmanaltinay

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Senior .NET full-stack developer (Belgium): ERP & e-commerce integrations, AI automation, web apps & APIs. Async-first.

Belgium

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What I'm looking for

I work remotely and async-first, with written communication and short, fixed-price milestones or hourly engagements. Work done inside a client's own system (their ERP, 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).

I'm Selman Altinay, a Belgium-based software engineer (Rui Codex, Tielt-Winge) building 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.

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, Rui Codex's own AI translation SaaS. Rui Codex also publishes its own apps and games on Google Play.

I also build AI/n8n workflow automation.

How I work: async-first, written communication (English, Turkish, basic Dutch), short milestones. Work done inside a client's own system (their ERP, 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). 12+ years of experience.

Case studies: https://ruicodex.com/CaseStudies

Experience

Work history, roles, and key accomplishments

Current

Founder & CTO

Current

Rui Codex

Feb 2026 - Present (8 months)

Founder of Rui Codex, a software business in Belgium. Builds custom web applications, REST APIs, ERP/e-commerce integrations and AI workflow automation, and publishes Rui Codex's own apps and games on Google Play.

C#.NET ASP.NET Core REST APIs SQL Server PostgreSQL AI Automation N8n Android Flutter

Current

Chief Technology Officer

Current

MarQi Blinds

Feb 2022 - Present (4 years 8 months)

Technology lead for a manufacturing company, overseeing internal ERP-style platforms, production tracking, inventory and order lifecycle systems, and workflow automation.

ERP Production tracking Inventory Management Workflow Automation

Software Development Team Leader

Payolog

Jan 2023 - Sep 2025 (2 years 8 months)

Led backend and REST API development for payment and transaction processing, focusing on performance optimization and secure data handling.

Backend Development REST APIs Payment Processing Performance Optimization Security

Director of Software Development

Pointix Bilişim Teknolojileri

Sep 2022 - Jun 2024 (1 year 9 months)

Directed ERP system architecture, customization, and implementation projects, and established development standards and code quality practices.

ERP Architecture Customization Implementation Development Standards Code Quality

Senior Software Developer

iXiredu

Oct 2021 - Nov 2022 (1 year 1 month)

Developed ASP.NET Core and SQL Server backend for a learning management system, including role-based access control, data modeling, and performance tuning.

ASP.NET Core SQL Server Role Based Access Control Data Modeling Performance Optimization

Full Stack Developer

STAR GRUP

Oct 2017 - Oct 2021 (4 years)

Built custom business applications for HR, inventory, and cost tracking using C# and SQL Server, and developed corporate websites and e-commerce solutions.

C#SQL Server HR systems Inventory Systems Cost Tracking Web Development Ecommerce