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Yahse KoffiYK

Yahse Koffi

Full-Stack Next.js · NestJS · React Native & AI

€450/day
Lille, FR
3-7 years

Average response time: 1 hour

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About Yahse

Full-stack developer with 4 years of experience, I design and deploy web and mobile applications from A to Z, from the first commit to production.

I specialize in multi-tenant SaaS architectures, high-performance Next.js/React frontends, and robust NestJS/Node.js backends. I am involved in product design as well as infrastructure (CI/CD, Docker, Terraform, AWS).

My recent projects

▸ La Voix du Nord (Rossel Group): redesign and integration of a multi-tenant obituary solution in Next.js + AWS Lambda, deployed for publishers in France and Belgium.

▸ Civinat: co-founder and lead dev of a SaaS EdTech platform in production (Next.js / NestJS / PostgreSQL / Stripe), dedicated to preparing for French naturalization. Community of 92,000 organic subscribers.

▸ Koklo: founder of an open-source AI agent orchestrator, with a Rust CLI, a DAG workflow engine, and a complete test suite.

What sets me apart

Impact-oriented end-to-end builder: I take full ownership of a subject, from architectural thinking to deployment. I use AI (Claude Code, Cursor) as a real daily productivity lever, not a gadget.

I am comfortable working solo on an MVP or as support for a structured product team.

Available for remote missions · Response within 1 hour.
  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • La voix du Nord
    Programmer Analyst | Permanent Contract
    PRESS AND MEDIA
    November 2024 - Today (1 year and 9 months)
    Lille, France
    I am currently working on the evolution of an obituary application solution, acquired by my company from a startup.
    • **Backend**: hosted on AWS, composed of numerous Lambda functions in Node.js and Java. I am particularly involved in improving and evolving certain Node.js functions to enhance performance and stability.
    • **Frontend**: design and deployment of a multi-tenant interface in Next.js, allowing different publishers (France and Belgium) to use the solution in a centralized and harmonized manner within the group.
    This project is part of a group-wide application rationalization and integration strategy, combining technical expertise (AWS, Node.js, Next.js) and organizational vision.
    Next.js React.js AWS Lambda Node.js
  • Civinat
    Civinat SaaS EdTech Platform (Co-founder & Lead Dev)
    EDUCATION AND E-LEARNING
    February 2024 - Today (2 years and 6 months)
    Paris, France
    Civinat is a multi-tenant SaaS platform for preparing for French naturalization, in production with real users and active subscriptions.

    My role: design, development, and deployment of the entire technical stack, in complete autonomy.

    Stack: Next.js · NestJS · PostgreSQL · Stripe · AWS Cognito · Docker · GitHub Actions · Directus · Brevo · Cloudflare R2 · VPS

    Achievements:
    - Multi-tenant architecture from scratch (per-tenant isolation, plan and access management)
    - Payment and subscription system with Stripe (webhooks, credits, upgrades)
    - 9-question eligibility quiz with profiling (5 exit profiles)
    - Deployment and infrastructure management on VPS (Docker, GitHub Actions, Coolify/Dokploy)
    - Organic community: 92,000 subscribers (TikTok, Facebook, Instagram)
    Next.js NestJs PostgreSQL Node.js Typescript
  • La voix du Nord
    Programmer Analyst | Fixed-term Contract
    PRESS AND MEDIA
    October 2023 - October 2024 (1 year)
    Lille, France
    I worked on the maintenance and evolution of an obituary solution recently acquired by my company.
    • **Backend**: set of AWS Lambda functions in Node.js and Java, on which I contributed to the update and evolution of functionalities.
    • **Frontend**: Angular application, where I was particularly involved in improving the interface and developing new features.
    This assignment allowed me to strengthen my expertise in Angular and serverless Node.js, while working on a project that was both sensitive and highly visible.
    Node.js Typescript AWS Lambda

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Education

  • Titre RNCP niveau 7 expert informatique système d'information
    EPSI
    2025
    Titre RNCP niveau 7 expert informatique système d'information
  • Titre RNCP niveau 6 concepteur développeur d'application
    EPSI
    2021
    Titre RNCP niveau 6 concepteur développeur d'application

Skill set

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