Software Developer | Ecommerce Systems

Leonidas Michalopoulos

I build the systems ecommerce businesses run on.

Backend infrastructure, data pipelines, and integrations designed around how your business actually operates, not how a generic platform assumes it does.

About

Over the past few years, I've worked with brands that outgrew generic solutions and needed systems built around how they actually operate.

I start by mapping how data flows, from storefront to payments to analytics, and identifying where things break. From there, I design backends and pipelines that bring everything into one clear, reliable system.

The systems matter, but so does how people understand the data they produce.

What I work on

• Data pipelines: syncing platforms, cleaning data, making sure numbers match across systems
• Ecommerce backends: custom Ecommerce infrastructure, order flows, product management
• API integrations: connecting storefronts, payment systems, analytics, and third-party tools
• Analytics infrastructure: GA4, BigQuery, and custom reporting that reflects what's actually happening

Work

Selected projects and case studies.

• 

  Onymia Partner Platform

  A modular internal platform for client ticketing, financial management, and AI-powered support at Onymia.

• Working with Leonidas completely changed how we approach our systems and data. He doesn’t just build features — he understands the problem at its core and designs solutions that actually make sense long-term.

• Leonidas handled the web scraping project exactly as we needed delivering clean, accurate data without any issues. The whole process was fast, clear, and reliable.

• Leonidas built a fully custom B2B platform on top of WooCommerce that fits our business exactly. It’s not just a store, it’s a system tailored to how we operate.

• Leonidas handled my entire SEO strategy from start to finish, from planning to full technical implementation. The difference was clear within a short time.

Latest posts

• 

  Designing a Customer Intelligence Pipeline

  How to design a customer intelligence pipeline for ecommerce using clean data flows, unified customer profiles, and reliable analytics.

• 

  What Really Happens When You Let AI Write Your Code

  A practical reflection on integrating AI coding agents into real workflows and how they reshape engineering, thinking, and ownership of code.

• 

  The Cost of Constant Noise

  A practical look at how constant interruptions fragment attention, reduce deep work, and silently impact engineering output.

Contact me

I take on a small number of ecommerce projects each year.

If you need better data infrastructure, a reliable ecommerce system, or clarity in your analytics, I'd be glad to hear about it.