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Romain Crestey

@romaincrestey

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Senior web developer specializing in Svelte/Kit and TypeScript, focused on performant full‑stack apps.

France

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What I'm looking for

I seek senior engineering roles building performant, well-tested web platforms; opportunities to mentor, teach, and improve developer workflows.

I am a senior web developer with deep expertise in Svelte/Kit, TypeScript and Node.js, building production-grade web platforms and interactive experiences. At Radiofrance I led backend‑for‑frontend and data loading optimisations and developed the Ma Saison Radio interactive feature.

I have a strong testing and CI practice, maintaining e2e and unit tests, creating custom mocking systems and cleaning large TypeScript codebases. I also refactored client-side tracking and optimised pipelines for reliability and performance.

As an instructor since 2017 I delivered hundreds of hours of training on Svelte/Kit, JavaScript, React and data structures & algorithms, mentoring dozens of graduates and professionals. My background includes fintech, healthcare, and public‑sector projects, plus freelance work covering web and mobile.

I bring an engineering mindset from an aerostructures background, a passion for translating and maintaining Svelte documentation, and a collaborative approach to delivering maintainable, well‑tested software.

Experience

Work history, roles, and key accomplishments

Current

Senior Fullstack Web Developer

Current

Radiofrance

Jan 2023 - Present (2 years 10 months)

Led development of the French national radio broadcaster's unified platform, optimizing the Backend-For-Frontend and GraphQL data loading, delivering the Ma Saison Radio interactive experience and reducing TypeScript errors across the codebase.

SvelteKit TypeScript GraphQL CI CD Git Performance Optimization

Current

Web Development Instructor

Current

Independent / Training Providers

Jan 2017 - Present (8 years 10 months)

Delivered instructor-led training on Svelte/Kit, JavaScript, React and data structures & algorithms, totaling 1,250+ teaching hours across graduate and professional cohorts.

SvelteKit JavaScript React Curriculum Development Mentoring Public Speaking Workshop Facilitation

Senior Frontend Web Developer

MAPi

Jan 2020 - Dec 2022 (2 years 11 months)

Developed a fintech web application, migrated the codebase from Sapper to SvelteKit and optimized data loading to improve performance and maintainability.

Svelte SvelteKit TypeScript Data Loading Migration (Sapper→SvelteKit)Git

Senior Web Developer

NaturalPad

Jan 2019 - Dec 2020 (1 year 11 months)

Maintained and enhanced Medimoov therapeutic game platform, prototyped Medimoov v2 with React and Electron, and built healthcare informational websites.

React Electron JavaScript Prototyping Web Accessibility Git

Freelance Web & Mobile Developer

Freelancer

Jan 2017 - Dec 2019 (2 years 11 months)

Delivered multiple short-term projects including TV-embedded video streaming, real-estate platform, recipe mobile app, and online shop mobile app for various clients.

Web Development Mobile Development Video Streaming Frontend Frameworks Client Communication Rapid Prototyping Git

Associate Developer

Ants

Jan 2015 - Dec 2016 (1 year 11 months)

Built public-good projects including affluence prediction systems for recycling centers and beaches, and a browser-based 3D city visualisation for Bordeaux.

Frontend Development 3D Visualization JavaScript UX Git

Dynamics Engineer (Aerostructures)

Ingéliance

Jan 2010 - Dec 2014 (4 years 11 months)

Worked as a dynamics engineer specializing in aerostructures on engineering projects across the aerospace domain.

Dynamics Mechanical Engineering Technical Reporting engineering collaboration

Education

Degrees, certifications, and relevant coursework

ISAE (Institut Supérieur de l'Aéronautique et de l'Espace)

Post-graduate course, Aeronautical Structures

2010 - 2010

Post-graduate course in Aeronautical Structures completed at ISAE in 2010.

École Centrale de Marseille

Engineering degree, Mechanical Engineering

2009 - 2009

Mechanical engineering graduation completed at École Centrale Méditerranée (École Centrale de Marseille) in 2009; included two years of Erasmus courses in Madrid, Spain.