Freelancer profile translated to English.

Description

Full-Stack Developer React.js | Next.js | Ruby on Rails (Senior Expert)

Does your product need to evolve quickly, but your team lacks a developer capable of handling both front-end and back-end?

I step in to accelerate your development by mastering the entire stack: React.js/Next.js on the front-end, Ruby on Rails for the API.

My hybrid profile allows me to work on:

• Complete SaaS applications (React front-end + Rails API)

• Progressive migrations from Rails monoliths to decoupled architectures

• Complex user interfaces with advanced state management

• Performant RESTful and GraphQL APIs

• Third-party integrations (payments, external services, webhooks)

• Client-side and server-side performance optimization

I am particularly effective at:

• Taking over existing projects to evolve them without breaking everything

• Developing complex features requiring an end-to-end vision

• Continuous improvement of legacy codebases

• Implementing best practices (testing, CI/CD, documentation)

Technical Stack: React.js, Next.js, TypeScript, Ruby on Rails, PostgreSQL, Redis, Sidekiq, TailwindCSS, Styled Components, Jest, RSpec, Docker, GitHub Actions, Vercel, Heroku, AWS

Strengths:

• Versatility: I can handle a feature from start to finish

• Autonomy: No need for coordination between multiple developers

• Pragmatism: I prioritize solutions that work now

• Communication: I translate technical concepts into business terms and vice versa

Looking for a developer who can truly make a difference on your project?

Let's connect via video call to understand your technical and business challenges.

I will propose a concrete approach tailored to your context.

Guaranteed response within the day.

Industry field of expertise

Languages

French
Native or bilingual
English
Fluent

Workplace preferences

Can work on-site

Lille (up to 50km), Paris (up to 10km), Bordeaux (up to 10km), Lyon (up to 10km), Nantes (up to 10km)

BECQUET
Cross-functional Steering + Technical Contributions
E-COMMERCE
April 2024 - July 2024 (3 months)
Marquette-lez-Lille, France
Group Search Engine: from mockups to index quality
Context
Business objective to increase discoverability and multi-brand conversion.

Role
Cross-functional steering + technical contributions.

Actions
Understanding needs, coordinating mockups and prototypes (mobile/desktop),
- optimizing Algolia indexes,
- duplicating indexes for testing,
- monitoring analytics and fixing regressions.

Results
More consistent and performant search experience, reduction of UX friction points, reliable analytics base for making decisions on future iterations.
Stack: Algolia, Next.js, Figma, search analytics.
Next.js Algolia Figma External API Integration Gestion de projet
MISTER_E
Founder
January 2020 - Today (6 years and 5 months)
Lille, France
🚀 Mister E is a digital agency specializing in the design and development of custom web solutions.
We help B2B SaaS startups and SMEs transform their ideas into stable, performant, and scalable products.

🎯 Our expertise:
- Taking over and refactoring struggling MVPs (project rescue, code stabilization, refactoring)
- Development of web and SaaS applications (Next.js, Ruby on Rails, REST & GraphQL APIs)
- Integration of third-party services (Stripe payments, CRM, marketing tools, etc.)
- Hosting and deployment (Vercel, Heroku, AWS)
- Functional scoping & product support (clarifying needs, technical roadmap)

💡 Our method:
- Quick audit to identify blocking points
- Clear roadmap validated with you
- Milestone deliveries in short cycles (Agile / Scrum)
- Operational product on average within 8 weeks

✅ Proven results:
- 2 MVPs rescued = €380k ARR preserved for SaaS clients
- Average delivery time: 8 weeks
- Guarantee: functional deliverable validated with you

📅 We are currently supporting several projects and opening new slots each quarter.
Contact us for a free 30-minute audit to assess your needs.
B2B SaaS Next.js E-commerce Ruby on Rails Vercel
BECQUET
Front-end Tech Lead & Project Management
E-COMMERCE
October 2023 - April 2024 (6 months)
Marquette-lez-Lille, France
Tracking and Personalization: data scoping → reliable implementation
Context
Business alignment on measurement and preparation for product recommendations.

Role
Technical scoping and front-end guardrails.

Actions
"Catalog & Tracking" workshops with the publisher (Target2Sell/Mirakl),
tagging plan and datalayer,
Next.js specific "send event before redirect" management,
pre-production QA and environment release for batches.

Results
More robust tracking,
healthy foundation for personalization,
reduction in event loss,
KPI clarity for the business side.
Stack
Next.js,
GA4,
e-commerce datalayer,
deployment workflows
Next.js E-commerce Plan de taggage Google Analytics datalayer