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Phil Martinez

Senior Software Engineer

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Senior Software Engineer with 8 years building web applications and single-page applications in React and TypeScript. At Qonto, worked on an MCP-based AI agent for automated code migration and delivered features end-to-end for a B2B fintech product used by 600,000+ businesses. Actively building with LLMs and AI tooling in day-to-day engineering work.

skills
Languages
TypeScriptJavaScriptHTML5 · CSS3C#
Frameworks
ReactNext.jsReact NativeNode.jsEmber.jsAngular
Testing & Tooling
VitestPlaywrightQUnitJestStorybookViteWebpackVercelAWSAzure
AI & LLMs
Claude · GPTMCPCursoraiderPrompt eng.
experience
Independent
Aug 2025 — present

Personal Projects

    Qonto · Paris, France
    Jun 2023 — Aug 2025

    Senior Web Engineer

    • Led the frontend of Pay Later, Qonto's financing product, owning the end-to-end flow in React and TypeScript for 600,000+ businesses, covering design system integration through to production API delivery with backend and product teams.
    • Built and maintained a shared React component library and design system used across multiple product squads, standardizing design-to-code workflows and improving delivery speed across teams.
    • Worked on an MCP-based AI agent integrated into the editor to automate Ember-to-React migration across a 1M+ line codebase at 20× manual throughput; contributed to prompt engineering and evaluation.
    • Maintained test coverage across a hybrid Ember/React single-page application using QUnit, Vitest and Playwright; enforced quality through CI/CD pipelines and code reviews.
    • Mentored engineers on React, TypeScript and AI-assisted development. Contributed to hiring through technical assessments and interviews.
    TotalEnergies · Paris, France
    Sep 2020 — Feb 2023

    Full-Stack Engineer

    • Built key features of My Fast Charge in React, a platform for EV drivers to locate stations and track usage across 18,000+ charging points.
    • Developed REST APIs in C# ASP.NET to expose charging session and station data for partners and customers.
    • Built a developer portal giving third-party integrators self-service access to API documentation and testing tools.
    • Collaborated closely with product designers to ensure pixel-perfect implementation.
    • Onboarded and mentored a junior engineer through regular code reviews and pairing sessions.
    Amadeus · Nice, France
    Jan 2020 — Sep 2020

    Full-Stack Engineer

    • Built reusable UI components in Angular for a white-label design system deployed to airlines worldwide.
    • Created UI mockups in Figma for partner-facing interfaces and drove them through to implementation end-to-end.
    • Collaborated with product managers to refine requirements and validate feasibility before implementation.
    Wekolo · Nice, France
    Sep 2018 — Jan 2020

    Full-Stack Engineer

    • Built moderation features in React letting community managers review posts across Google and Facebook from a single interface.
    • Developed messaging features for the Wekolo mobile app in React Native.
    • Contributed to C# backend APIs alongside frontend development in a cross-functional team.
    Geek School · Nice, France
    Jan 2018 — Sep 2018

    Coding Instructor

    • Taught programming fundamentals to groups of 10–20 students aged 8–16, from Scratch to JavaScript game development.