Freelancer profile translated to English.
Back to original languageAbout Mohamed
Is your PHP/Symfony backend becoming slow, difficult to maintain, or risky to evolve?
I help companies with their critical applications: legacy modernization, backend architecture, performance improvement, production incident resolution, and generative AI integration.
I particularly work in environments where reliability is essential: fintech, B2B platforms, scientific data, high-demand APIs, and complex business systems.
My main interventions:
- Audit and stabilization of PHP/Symfony applications
- Progressive refactoring of legacy systems without service interruption
- DDD, hexagonal, and CQRS architecture
- Optimization of Doctrine queries, batch jobs, APIs, and large-volume processing
- Design of robust and secure REST APIs
- Integration of generative AI with AWS Bedrock
- Technical guidance, code reviews, and skill development
Key experiences:
Stack:PHP 8, Symfony 6/7, Doctrine, REST API, DDD, hexagonal architecture, CQRS, MySQL/Aurora, DynamoDB, AWS, Bedrock, Lambda, SQS, EventBridge, Docker, and GitLab CI.
Based in Paris, available for hybrid or remote assignments, preferably for several months.
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 50km)
Experience
- TREEZORSenior Backend PHP/Symfony – Fintech & AIBANKING AND INSURANCEJanuary 2023 - Today (3 years and 7 months)Paris, FranceAt Treezor, a high-volume regulated Banking-as-a-Service platform, I work on critical backend systems related to financial operations, wallets, transactions, KYC, and incident management.Main achievements:
- Refactoring and optimization of the Symfony back-office used daily by operational teams.
- Design of robust backend features for sensitive financial and regulatory processes.
- Diagnosis and resolution of production incidents: latency spikes, failed processes, reconciliation anomalies, and high-load APIs.
- Optimization of Doctrine queries, batch jobs, and REST endpoints to improve performance and reliability.
- Design of business components using DDD, hexagonal architecture, and CQRS, with a focus on maintainability and testability.
- Integration of generative AI solutions with AWS Bedrock and Symfony AI to assist Ops teams, automate certain processes, and facilitate case analysis.
- Contribution to technical quality: code reviews, automated testing, documentation, and developer support.
Stack:PHP 8.4, Symfony 7, Doctrine, REST API, DDD, hexagonal architecture, CQRS, Aurora MySQL, DynamoDB, AWS Bedrock, Lambda, SQS, SNS, EventBridge, Docker, and GitLab CI. - CEATech Lead PHP/Symfony – LIMS RefactoringBIOTECHJune 2019 - December 2022 (3 years and 6 months)Fontenay-aux-Roses, FranceAt the IDMIT department of CEA, I led the modernization of BATLab, a laboratory information system used by approximately 150 researchers to manage data and processes related to immunology and infectious disease research.The application was based on a legacy PHP codebase without a framework, which had become difficult to maintain and evolve.Main achievements:
- Definition and management of the progressive migration strategy from legacy PHP to Symfony, while maintaining service continuity.
- Redesign of the application architecture to improve maintainability, testability, and the system's evolution capacity.
- Technical supervision of a team of three developers: architectural choices, code reviews, best practices, and skill development.
- Design of new business modules and integration of scientific platforms and data visualization tools.
- Resolution of recurring incidents inherited from the old codebase.
- Direct collaboration with researchers to translate complex scientific needs into reliable technical solutions.
Result:a modernized, more stable, and easier-to-evolve Symfony application, enabling faster integration of new needs and scientific platforms.Stack:PHP, Symfony, Doctrine, MySQL, Vue.js, Docker, GitLab, and Tableau Software. - Orange MarocSymfony Backend Developer – Telecom APIsTELECOMMUNICATIONSApril 2018 - April 2019 (1 year)Casablanca, MoroccoAt Orange Maroc, I participated in the design and modernization of backend applications used for subscriber management and the interconnection of several business systems.The mission focused particularly on high-demand REST APIs and a codebase whose coupling slowed down evolution.Main achievements:
- Design and integration of REST APIs to connect different internal applications and business services.
- Development of backend features in PHP/Symfony in a high-demand telecom environment.
- Performance optimization and refactoring of critical components to improve their reliability and maintainability.
- Analysis of business needs and writing of technical specifications.
- Translation of functional constraints into technical choices and architectural solutions.
- Corrective and evolutionary maintenance of applications in production.
- Participation in securing evolutions on critical business workflows.
Stack:PHP 7, Symfony 3/4, REST API, MySQL, MariaDB, Docker, and Git.
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Education
- Master in BioinformaticsENSIAS2018Formation pluridisciplinaire alliant informatique, algorithmique et sciences du vivant. Spécialisation en bioinformatique : traitement de données biologiques à grande échelle, conception d'algorithmes de comparaison et de classification, modélisation de systèmes complexes. Projet de fin d'études : développement d'un algorithme de comparaison et de classification de données génomiques - conception algorithmique, implémentation, validation sur jeux de données réels.