Freelancer profile translated to English.
Back to original languageAbout Drozo
You have a critical PHP application that has been running for 5, 8, 10 years.
No one wants to touch it.
Your developers tell you "it's complicated" without being able to explain it to your management.
Modernization budgets never get approved.
This is the daily reality for most IT Directors and CTOs I meet.
My job: transform this invisible technical debt into figures readable by an executive committee.
Complete codebase audit. Risk mapping. Man-day costed remediation plan. 3 budgeted scenarios. All delivered in a report readable by a human who has never coded. Delivered in 10 to 15 days.
Then, modernization support.
No "from scratch" rewrites – I've seen total rewrites kill companies. We modernize piece by piece, without interrupting production. Strangler Pattern, tests first, targeted refactoring.
Some concrete results:
→ Migration from Symfony 1.4 to 6.4 on a high-traffic national SEO platform. Without service interruption. Without SEO impact. (HelloWork / Diplomeo, 2 years)
→ A critical SQL query went from 5 seconds to 5 milliseconds on a high-volume e-learning platform. (ECNI)
→ Prometheus / Grafana observability on a high-volume e-commerce platform: shift from reactive to proactive mode. (Additi Media, Groupe Ouest-France)
-> CI/CD deployment optimization => 15 minutes => 3 minutes
15 years of PHP, half of it on legacy. Critical missions with HelloWork, Ouest-France, Orange, CDC Habitat, Diplomeo, Additi Media, ECNI, Voyo.
What I don't do:
"From scratch" rewrites on critical legacy systems
Long-term engagements without modernization goals
Standard development tasks without a technical debt dimension
If you recognize your situation, let's talk for 30 minutes.
Response within 24 business hours. Click "Propose a project" or "Engage the conversation" above.
French
Native or bilingual
English
Native or bilingual
Can work on-site
Paris (up to 50km), Rennes (up to 50km), Bordeaux (up to 50km), Lyon (up to 50km), Toulouse (up to 50km)
Experience
- Additi MediaSenior Full-Stack DeveloperPRESS AND MEDIAOctober 2024 - Today (1 year and 8 months)Rennes, France
→ Key results:
- MVP industrialization: scaling from 10 to 200 users (x20) by implementing scalability, test coverage, caching, and load handling.
- Display time reduced from 15s to 4s on a complex application (multiple API calls, microservices architecture) by reworking SQL stored procedures.
- Implementation of an upsell module on the ordering tool, contributing to increased average order value.
- Creation of a user synchronization worker (employees ↔ Salesforce).
- Shift from reactive to proactive monitoring using Prometheus / Grafana – detecting anomalies before user reports.
Context: E-commerce platform structured in microservices (DDD, clean architecture). High volume, service continuity requirement. Mission covering both legacy modernization and new service MVP industrialization.Approach:
Industrializing an MVP: scalability, tests, caching, load handling – to scale from a dozen target users to several hundred.Reworking SQL stored procedures to optimize critical paths with high API calls.Designing and developing the upsell module (order → average basket impact).Developing an employee synchronization worker with Salesforce.Prometheus instrumentation, Grafana dashboards on critical paths and service health.Alerting on business and technical thresholds – acting before user impact.Developing complementary features in compliance with existing DDD standards.Stack:
Symfony 7, PHP 8.*, MariaDB, Docker, GitLab CI/CD, Prometheus, Grafana, Behat, PHPUnit, Cypress, PHPStan, Salesforce API - VoyoSymfony Lead Dev | PHP | SQLREAL ESTATEDecember 2024 - June 2025 (6 months)Rennes, France
→ Key result:
Secured a quickly prototyped platform where sensitive data was leaking due to a lack of tests and security practices. Fixed vulnerabilities, implemented end-to-end test coverage where none existed, structured CI/CD with proactive monitoring. Critical conversion funnel (search → booking → payment → wallet) is now reliable and audited.Context:
Startup in growth phase. Application developed in "ship fast" mode without automated tests or initial security hardening. User sensitive data was exposed. The conversion funnel is the only path to revenue – every regression costs directly.Approach:
- Security audit, fixing sensitive data leaks.
- Design and implementation of APIs: online payment, booking, user wallet.
- SQL query optimization on the booking path.
- Implementation of unit test coverage (PHPUnit), functional and end-to-end tests (Cypress) on the critical path.
- CI/CD GitHub Actions, Sentry monitoring for proactive management.
Stack:
Symfony, PHP 8, MySQL, GitHub Actions, Sentry, Cypress, PHPUnit - ECNISenior Support - Critical V2 Symfony | PHP | SQLEDUCATION AND E-LEARNINGMay 2024 - August 2024 (3 months)Paris, France
→ Key result:
Critical SQL query went from 5 seconds to 500 milliseconds (x10 gain) on the hot path of the most used feature. Architecture now ready to accommodate new use cases without performance regression.Context: High-volume platform, blocking UX degradation on the flagship feature. Query called repeatedly, without cache or read/write separation.Approach:
- Analysis of SQL execution plans, identification of missing joins and indexes.
- Query rewrite + adjustment of indexing schema.
- Implementation of a QueryBus via Symfony Messenger (CQRS pattern) to decouple reads and writes.
- Targeted refactoring, unit tests to secure existing behavior.
Stack:
Symfony, PHP 8.1, MariaDB, Symfony Messenger (CQRS), API Platform, PHPUnit, Behat, PHPStan
Recommendations
+2
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Education
- Master in Computer Science, Computer ScienceSUPINFO International University2010Master en informatique, Informatique
- BTS in Management Information Systems, Computer ScienceLycée Louise Michel, Bobigny2007BTS Informatique de gestion, Informatique