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Gauvain TheryGT

Gauvain Thery

Product Engineer Full-Stack | TypeScript

€650/day
Lorient, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Gauvain

You design your features with Claude, Cursor or Lovable, but dread the moment when the technical side will crack?

I enable you to launch or evolve your products in a scalable and secure way, with the fluidity of an AI exchange.

I act as the bridge between your business ambitions and a robust infrastructure, without friction or technical jargon.

đŸ—ïž INTERVENTIONS
  • Launch From Scratch (SaaS/MVP) :Transform your unstable AI idea or prototype into a secure, market-ready asset.
  • Product Brick Sprint :Autonomous integration of complex modules into your existing system without overloading your team.
  • Consolidation (Guardrail) :Takeover after the "vibe coding" wall. Refactoring, data security, and clean setup for scaling.

💎 ROI-ORIENTED ENGINEERING

EDHEC graduate, ex-Growth and Full-Stack Dev at PayFit, I bring a rare product culture:
  • Pragmatic :Clean architecture serving your metrics and your audience
  • AI Velocity (LLM/Agentic) :I leverage AI to generate 80% of the standard code and focus my time on the critical 20%
  • Zero Friction :No technical jargon, we talk conversion, retention, and value

đŸ› ïž TECHNICAL STACK
  • Front :React, Next.js, Tailwind, TypeScript, JavaScript
  • Back/Infra :Node.js, Nest.js, Supabase, Convex, Clerk, PostgreSQL, Docker, AWS, GCP
  • Ops/Data :n8n, Make, Stripe, PostHog, CRM APIs

📈 JOURNEY & IMPACT
  • Since 2025 (AI) :Dev of the SaaS Maply, Dev of the influencer management app for Lovable (via Railblocks)
  • Zefir (Full-Stack Dev) :Architecture and build of a real estate marketplace
  • PayFit (Growth & Dev) :Automated lead systems to go from €10M to €50M ARR, Dev of the showcase website and customer service platform

📞 LET'S SECURE YOUR TECH

A product to launch or a module to integrate? Let's chat for 15 min.

Response within 30 minutes.
  • French

    Native or bilingual

  • English

    Native or bilingual

Can work on-site
Lorient (up to 50km), Paris (up to 10km)

Experience

  • Freelance
    Product Engineer | Software Engineer
    SOFTWARE PUBLISHING
    January 2025 - May 2026 (1 year and 4 months)
    Lorient, France
    Technical support for founders and product teams: from AI-powered MVPs to the consolidation of robust and scalable web architectures.

    · Use Case #1 | Web Application & Product Management (SaaS Influencer) : Lead Product Engineer for the complete build and deployment of the influencer management platform for a leading AI company (Lovable).

    · Use Case #2 | B2B Automation & Acquisition : Design and deployment of automated data scraping and enrichment pipelines to unlock a tech client's acquisition channels.

    · Use Case #3 | HR Tool & Applied AI : Design, architecture, and complete build of an intelligent micro-SaaS for candidate analysis. The AI agent parses and scores CV relevance against a job description in real-time.

    · Use Case #4 | Eco-design (Green IT) : Build of several micro-web applications to test and concretely apply best practices for digital sobriety (radical code performance optimization, reduced carbon footprint of requests, and frugal architectures).
    React.js Next.js Convex Supabase Vercel
  • Zefir
    Software Engineer
    REAL ESTATE
    April 2023 - October 2024 (1 year and 6 months)
    Paris, France
    Architecture and complete build of Zefir's real estate marketplace (B2B/B2C) to streamline and secure transactions at scale.

    · Marketplace Build : Development and deployment of key platform features, from listing management to complex purchase/sale funnels.

    · Front & Back Architecture : Design of robust and scalable modules (React, Next.js, Node.js) capable of handling large data volumes without performance loss.

    · Integrations & Third-party APIs : Connection and synchronization of critical services (authentication, real estate data feeds, artificial intelligence) to ensure a fluid and secure user experience.

    · Product Pragmatism : Ultra-fast iteration on code in direct collaboration with the Product team to stay closely aligned with field validation and business ROI.
    Next.js React.js Node.js TailwindCSS Google Cloud
  • Maria Schools
    Headmaster
    EDUCATION AND E-LEARNING
    April 2023 - November 2023 (7 months)
    Paris, France
    Pedagogical direction, content framing, and arbitration of technical expertise (Acquisition, Data, Automation) for the Tech ecosystem's flagship training program.

    · Teaching & Pedagogy : Design and delivery of advanced Masterclasses on automation and "growth".

    · Quality Assurance (Content & Speakers) : Selection, onboarding, and validation of Tech experts teaching in the program. Continuous content auditing to ensure operational excellence.

    · Consulting & Support Role : Strategic and technical support for students on their specific acquisition, tracking, data architecture, and workflow challenges.
    Automation Low-code Artificial Intelligence Web Project Management Pedagogy

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Education

  • Fullstack Web Developer
    La Capsule
    2022
  • Master Grande École
    EDHEC
    2018

Skill set

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