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Jonathan PlazanetJP

Jonathan Plazanet

Symfony / PHP Backend Developer · Agentic Coding

€500/day
Paris, FR
3-7 years
Symfony
PHP Symfony
Claude Code
Agentic Coding
Back-End Development

Average response time: 1 hour

Freelancer profile translated to English.
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About Jonathan

Web Developer since 2021, after about ten years as a management controller and administrative and financial manager.

Backend Symfony development, industrialized with AI agents: implementation with Claude Code, review with Codex, specs as the source of truth.

Achievements: Custom ERP for an industrial company (pricing engine, quotes, purchase orders, invoices), energy diagnosis simulator, quote generator, APIs.

Methodology: SDD (Spec-Driven Development), DDD, hexagonal architecture, Agile Scrum.

Available. Full remote or Paris hybrid.
Construction
Digital and IT Services

  • French

    Native or bilingual

  • English

    Conversational

Can work on-site
Paris (up to 10km)

Experience

  • Freelance
    BACKEND WEB DEVELOPER
    CIVIL ENGINEERING
    November 2024 - April 2026 (1 year and 5 months)
    Lyon, France
    Custom business ERP for an industrial company (building materials):
    Objective: centralize and digitize management.
    - Design and development of a custom ERP based on the client's business process modeling.
    - Pricing calculation engine.
    - Document suite: quotes, purchase orders, production orders, delivery notes, invoices.
    - Transactional emailing (onboarding, quotes, invoices).
    - APIs for frontend and functional tests.
    Stack: PHP 8, Symfony, Twig, MySQL, PHPUnit. DDD, hexagonal architecture.
    Git Docker REST APIs PHP Symfony Domain Driven Design
  • ISGLÖ
    FULLSTACK WEB DEVELOPER
    CIVIL ENGINEERING
    January 2022 - November 2024 (2 years and 10 months)
    Colombes, France
    Modular monolith in independent business components (CRM API, call center API, quote generator, simulator):
    Objective: centralize services to facilitate the development and maintenance of isglö tools.
    - Communication between components via SPI and event managers, APIs for external use.

    Energy diagnosis simulator:
    Objective: capture qualified leads.
    - 10-step form.
    - Calculation service: diagnosis before/after, works, aid, loan.
    - PDF report, automated sending (transactional email, CRM).

    Internal quote generator:
    Objective: sales team productivity.
    - Dashboard and quote form: drag-and-drop, dynamic numbering, live editing.
    - Google Sheets API integration (price list), PDF generation.
    Stack: PHP 8, Symfony 6, Twig, Vue 3, JavaScript, TypeScript, NestJS, PostgreSQL, MySQL, PHPStan, Nx, Jest. DDD, TDD.
    NestJs REST API Git PHP Symfony Domain Driven Design
  • Degetel
    CONSULTANT - BACKEND WEB DEVELOPER
    MECHANICAL ENGINEERING
    February 2022 - October 2022 (9 months)
    Boulogne-Billancourt, France
    Data centralization APIs:
    Objective: enable online booking for laundromats.
    - Online booking and payment service.
    - Remote communication service with machines (M2M).
    - Integration of external providers (payment, customer data storage).
    - Independent components (Bounded Contexts), communication via SPI, events, and APIs.
    Stack: PHP 8, Symfony 5, Twig, MariaDB, PHPStan, PHPUnit. DDD, Agile Scrum.
    REST API Git PHP Symfony Agile methodology Domain Driven Design
Check out Jonathan's experience

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Education

  • Professional Title Web and Mobile Web Developer
    O'clock
    2022
    Titre Professionnel Développeur Web et Web Mobile - Niveau V Formation intensive en téléprésentiel 3 mois de socle : HTML5/CSS3/Javascript/PHP/MySQL 1 mois de spécialisation : React 1 mois de projet : mon pOtager (dev front-end et référent technique) 1 mois de spécialisation : Symfony 1 mois de projet : Clicks N Co (dev back-end et git master)
  • RS6515 Certification
    Alyra
    2025
    Développement d'applications décentralisées sur Ethereum (certification RS6515). Fondamentaux blockchain : architecture décentralisée, preuve de travail, structure des blocs. Ethereum : transactions, gas, smart contracts, blockchain privée locale. Solidity : conception, développement et déploiement de smart contracts (Remix, Hardhat, Metamask, Infura, Alchemy). Tests : tests unitaires des smart contracts, notions CI/CD. Sécurité : bonnes pratiques Solidity, optimisation du coût en gas, vulnérabilités courantes, audit de smart contracts. DApp complète : front-end NextJs connecté aux smart contracts (Wagmi). Finance décentralisée : protocoles DeFi (Aave, Uniswap), Chainlink. NFT : standards de smart contracts, IPFS, collection NFT, contrats upgradables. Projet final : Chess To Earn (Solidity, Hardhat, Next.js, déployé sur Holesky

Certifications

Jonathan's certifications are only visible to Malt Community members

Skill set

Docker
Postman
TDD
JavaScript
NestJs
Solidity
Hardhat
Next.js
TailwindCSS
Typescript
Git
Agile Scrum
SASS
Agile methodology
External API integration
Backend Service Development
CI/CD Management
Claude Code
artificial intelligence
HTML5
CSS3
Agentic Coding

Categories