---
title: "Reverse Engineering - José DA COSTA"
description: "Reverse engineering of Google, MSN and Voila.fr ranking algorithms. Custom algorithms to analyze the weight of each HTML element in SERP ranking. Advanced statistical analysis of ranking signals and algorithmic vulnerability detection."
locale: "en"
canonical: "https://portfolio.josedacosta.info/en/skills/reverse-engineering"
source: "https://portfolio.josedacosta.info/en/skills/reverse-engineering.md"
html_source: "https://portfolio.josedacosta.info/en/skills/reverse-engineering"
author: "José DA COSTA"
type: "skill"
slug: "reverse-engineering"
generated_at: "2026-04-23T15:42:32.302Z"
---

# Reverse Engineering

**Technical competency** - CTO · Founder · technical director (Celiane) - Advanced

## Competency description

Reverse engineering of Google, MSN and Voila.fr ranking algorithms. Custom algorithms to analyze the weight of each HTML element in SERP ranking. Advanced statistical analysis of ranking signals and algorithmic vulnerability detection.

## Personal Confidence

**Advanced** - 4/5

Scale: 1. Foundational · 2. Developing · 3. Proficient · 4. Advanced · 5. Expert

This reflects my personal confidence in applying this competency in real-world professional situations, based on hands-on experience, continuous learning, and practical outcomes.

## Details

- Domain: Hard skill (technical)
- Source: CTO · Founder · technical director (Celiane)
- Confidence level: 4/5 (Advanced)
- Category: software-dev

## Other technical competencies from the same diploma

- [SEO, SEM & SERP Optimization](https://portfolio.josedacosta.info/en/skills/seo-sem-serp.md) - SEO, SEM and SERP analysis. France TOP 10 Carpediem affiliates, PageRank 5-6/10, 0.1-1% conversion rate. Organic search strategies across 260 multilin
- [Fullstack Development](https://portfolio.josedacosta.info/en/skills/fullstack-development.md) - Built and maintained 260 websites from scratch in PHP/HTML/CSS/MySQL, including a custom CMS (WSG), scraping algorithms, automated content generation
- [System Architecture](https://portfolio.josedacosta.info/en/skills/system-architecture-design.md) - Designed the WSG (Web Site Generator) architecture capable of generating millions of pages, scraping systems, SEO analysis databases and automated sub
- [JavaScript Programming](https://portfolio.josedacosta.info/en/skills/javascript-programming.md) - JavaScript for interactivity across the 260-website network, form validation, DOM manipulation for affiliate modules.
- [Algorithms and Complexity](https://portfolio.josedacosta.info/en/skills/advanced-algorithms-complexity.md) - Scraping algorithms, captcha cracking by pattern recognition and automated content generation (spinning).
- [Databases](https://portfolio.josedacosta.info/en/skills/database-fundamentals.md) - MySQL database design, SQL queries, basic administration.
- [System Administration](https://portfolio.josedacosta.info/en/skills/system-administration-bts.md) - Web server administration, Apache configuration, hosting management.
- [Network Infrastructure Design and Management](https://portfolio.josedacosta.info/en/skills/network-infrastructure-design-management.md) - Basic network configuration, domain name and hosting management.
- [Scripting and Automation](https://portfolio.josedacosta.info/en/skills/scripting-automation.md) - First automation scripts, basic crontab usage.
- [Network Security](https://portfolio.josedacosta.info/en/skills/network-security-cybersecurity.md) - Network security basics, SSL certificates, basic firewall configuration.

## Acquired during: CTO · Founder · technical director

Software publishing company managing 260 multilingual websites across 15 languages and 5 countries. Monetized through SEO and affiliate marketing, generating 500K EUR net profit. Started at age 18.

[See full journey entry](https://portfolio.josedacosta.info/en/journey/celiane-founder.md)

Full interactive page with navigation: https://portfolio.josedacosta.info/en/skills/reverse-engineering