Axel Vincent

About

Senior Fullstack TypeScript & AI Engineer · Paris, France

Have a product to build, scale, or extend with AI?

I help startups and companies design and ship web products and AI systems, from architecture through to production.

Eight years of product engineering at Kapten, Swile and Shares, then CTO of my own startup. Today I work freelance as a senior software engineer and AI engineer.

What I do

Product & platform
  • Backend and fullstack TypeScript development
  • MVPs designed and built to be robust and to scale
  • Architecture design and technical decision-making
  • Reinforcing existing engineering teams
  • POCs, prototypes, and short engagements
AI engineering
  • LLM-based AI features
  • RAG systems, agents, and agentic workflows
  • Evaluations and observability for AI systems

How I work

Having worked as a developer, a CTO, and a product engineer, I read a problem from the technical and the product side at once.

I favour pragmatic, maintainable solutions that fit the context of the project. I can own a subject end to end, or slot straight into your team.

Since 2024 I have specialised in AI engineering, and have designed and deployed several agentic products in production for clients.

Communication carries as much weight as the code: understanding your business and your constraints is what makes it possible to build the right thing.

Stack

Backend
TypeScriptNode.jsPostgreSQLRedis
Frontend
ReactVite
Infrastructure
DockerKubernetesRailwayGrafana
AI
LLMsRAGAgentsEvaluationsLangChainMastraHarness

Experience

  1. May 2024 — nowParis, France
    JXLR EngineeringFreelance Senior Software Engineer / Hands-on CTO

    I help companies design, build, and ship production-ready web products and AI-powered systems, working end to end from technical architecture and product development through to infrastructure, deployment, and observability. I also support teams as a senior individual contributor or hands-on technical lead.

  2. Jan 2025 — Jan 2026Lisbon, Portugal
    RitchyCTO & Co-founder

    Built and scaled a B2B prospecting platform solo from the ground up, combining Google Maps data with European business registries, AI agents for waterfall enrichment, and vector search.

  3. Apr 2022 — Jul 2024
    SharesSenior Backend Engineer

    Designed and maintained backend systems for a social investing platform, working on high-reliability financial features at scale inside a fast-growing fintech.

  4. Aug 2020 — Apr 2022
    SwileFullstack Engineer

    Developed fullstack features for an employee benefits super-app, contributing to both product evolution and internal tooling across a high-growth scale-up.

  5. Sep 2018 — Aug 2020Île-de-France, France
    KaptenBackend Engineer — Payment Specialist

    Owned payment infrastructure for a ride-hailing platform, building robust and secure transaction flows handling high volumes in a regulated environment.

  6. May 2018 — Sep 2018Grenoble, France
    NAVER LABSFrontend and Data Visualisation Engineer

    Built interactive data visualisation interfaces for a research-driven tech lab, bridging complex datasets with intuitive front-end experiences.

  7. Apr 2017 — Sep 2017Grenoble, France
    LIG GrenobleFullstack Engineer / Statistician

    Developed fullstack tools and statistical models within a computer science research lab, combining engineering and data analysis work.

  8. Apr 2016 — Sep 2016Toulouse, France
    VaiomerBiostatistician

    Applied statistical methods to biological data in a microbiome research context, contributing to data processing and analysis pipelines.

My goal: turn what you need into software that is reliable, maintainable, and genuinely usable in production.

Email me about your project
  • Based inParis, France — open to on-site work within 50 km
  • LanguagesFrench (native), English (bilingual)
  • FieldSoftware publishing