Freelancer profile translated to English.
Back to original languageAbout Jérémie
I have been a full-stack JavaScript developer since 2016. Today I work on modern frontend stacks (SvelteKit, Svelte 5, Next.js, React, Tanstack Start) and their Node backend (Fastify).
Specifically, I can get involved in:
- a redesign or a new project
- setting up a backend layer
- improving the performance and quality of an existing project
- setting up a testing layer
- auditing your existing codebases
Stack:
- Frontend: SvelteKit, Svelte 5, Next.js, React, TypeScript, UnoCSS, Tailwind, Tanstack Start, Tanstack Query
- Backend: Node.js, Fastify, Express, GraphQL, REST API
- Tests: Vitest, Playwright, Cypress, Pact, MSW
- Tools: GitLab CI, Docker
Based near Paris, I can work on-site (Paris / IDF) or remotely.
Long or short missions, contract or fixed price, let's discuss it.
French
Native or bilingual
English
Fluent
Can work on-site
Sorel-Moussel (up to 50km), Paris (up to 15km)
Experience
- ViaMichelinJavascript DeveloperTRAVEL AND TOURISMApril 2024 - Today (2 years and 4 months)Boulogne-Billancourt, FranceProgressive redesign of the ViaMichelin public website (mapping, routes, associated services) within a team of 14 people (1 PM, 2 POs, 1 CTO, 3 Tech Leads, 2 QAs, 5 Devs).Full-stack scope:
- Front: SvelteKit + Svelte 5 (migration to runes), UnoCSS, Bits UI, web performance
- Back: BFF Fastify with GraphQL Yoga, MongoDB
- CI/CD on gitlab
Some topics:- Setting up Pact contract testing between the SvelteKit frontend and the BFF, to avoid silent integration regressions
- Testing strategy according to the Testing Trophy (Vitest unit + integration, Playwright e2e, mutation testing, MSW for front-end mocking)
- Improvement of the agentic harness for daily coding (AGENTS.md + specialized Svelte 5 runes and Houdini GraphQL skills)
- DB migration scripts
Stack: SvelteKit, Svelte 5, TypeScript, Fastify, GraphQL (Houdini, Yoga), Vitest, Playwright, Pact, MSW, UnoCSS, Bits UI, GitLab CI, Kubernetes, Azure, MongoDB - UpplyFront-end DeveloperTRANSPORTATIONJuly 2023 - March 2024 (8 months)Levallois-Perret, FranceB2B SaaS platform for price and capacity forecasting in transport and logistics. Team of 2 front devs, 1 PO, 1 Head of Dev, and 2 QAs.My scope:
- Feature development on the web platform (Next.js) and the back-office
- Client-side GraphQL integration with React Query
- Work on code quality and front-end testing
Stack: React, NextJs, React-query, Styled-component, Javascript, Docker, Graphql, Jest, Cypress, Typescript, Testing Library, Material UI, MSW, Github, Github Actions, Datadog - Spectral TMSJavascript DeveloperSOFTWARE PUBLISHINGJune 2023 - July 2023 (1 month)Paris, FranceShort mission (1 month) to support a business workflow management tool, within a team of 4 devs supervised by a PM and a co-founder.My scope:
- Development of a workflow management component on the frontend (React)
- Integration with the Node backend API via REST
- Rapid iterations with the PM and founders on specs
Stack: React, React Query, Node.js, TypeScript, REST
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Education
- Web Developer / Integrator, Web DevelopmentWebForce32016Développeur / Intégrateur web, Développement web
- Digital Film Animation, Audiovisual MultimediaSAE Institute Paris2010Digital Film Animation, Multimédia Audiovisuel
Certifications
- TestingJavascripthttps://www.testingjavascript.com/2020
- EpicReacthttps://www.epicreact.dev/2020