Freelancer profile translated to English.
Back to original languageAbout Yannick
💻Self-taught full-stack developer,I work oncomplex technical projectsrequiringautonomy, rigorand the ability tostructure a solution from end to end.I assist startups and project owners with thedesign, architectureanddevelopmentof web applications, back-ends, automations, and API integrations.
🛠️ Coming fromsystem administration and IT support,I am comfortable withtechnical and non-technical stakeholders.This experience allows me toquickly understand business needs**, ask the right questions, and transform sometimes vague requests into **concrete, reliable, and maintainable technical solutions.
📐 Used to workingalone or in a teaminagile environments,I pay particular attention tocode quality**, **performance**, **security**, and **project constraint adherence.
⚙️ Skills & main stack
- Front-end:TypeScript, Next.js, React, Material UI
- Back-end:TypeScript, Node.js, NestJS, REST APIs, WebSockets, C# / .NET
- Automation & bots:scripts, orchestration, asynchronous processing
- Integrations:Third-party APIs (payment, social networks, AI, blockchain)
- Applied AI:AI agents, prompt engineering, RAG
- Databases:SQL / relational
- Environments:Docker, Linux, deployment and operation
📩 If my profile matches your expectations or if you have any questions, feel free to contact me to discuss your project.
French
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- PostformeLead Full Stack DeveloperJanuary 2025 - June 2025 (5 months)
Lead Full Stack Developer – Post for Me (AI & Social Networks)
Development of an AI agents SaaS platform for automated social media account management for Post for Me.Role of lead developer in charge of architecture,technical choices, and implementation of the entire product, with occasional discussions with a senior AI expert for validation of directions.Design and integration of **AI agents based on ElizaOS**, including advanced prompt engineering, character configuration, RAG (knowledge), conversational styles, example messages, and dynamic behaviors, to allow users to easily define the character of their AI agent.Development of a **social media automated management system (Twitter and Instagram)**: message responses, interactions, post scheduling, automatic text content generation, and adherence to configurable activity windows to replicate credible human behavior.Implementation of an **automatic personality copying feature**, capable of analyzing an existing social account to generate a coherent AI character.Full management of API integrations**, covering authentication, account delegation, permissions, limitations, and quota optimization, as well as **preparation of Meta technical files(official usage descriptions, functional demonstrations, compliance with rules) andobtaining the necessary official validations for API operation.Implementation of **business features**: user account and subscription level management, Stripe integration for payments, and Calendly for automated appointment booking via private messages.Project led using agile methodology.Stack: Next.js, TypeScript, Material UI, NestJS, ElizaOS, AI APIs (OpenAI, Mistral), Social network APIs. - GAM New HorizonSenior Full Stack DeveloperJanuary 2024 - July 2025 (1 year and 6 months)
Senior Full Stack Developer – GAM Project on Cross The Ages (Blockchain & NFT game)
Development and operation of a complete technical ecosystem around the blockchain gameCross The Ages(NFT-based card game) for the GAM Market project.Implementation ofC# (.NET) botsindexing and synchronizing **all CTA assets on the Immutable X blockchain**: global NFT inventory, wallets, quantities, states, histories, etc. This global database provided an exhaustive view of the CTA ecosystem, including GAM's internal accounts, and formed the technical foundation of the entire project.Design of **three web platforms**:*Free Trackerallowing players to analyze their CTA wallet(s): collection progress, duplicates, completion, and NFT distribution.- **Internal account supervision tool**, for managing hundreds of accounts operated by Indonesian players (paid by GAM): in-game currency (Trisel) production monitoring, objective tracking, and reporting.
- **Trisel crafting / reselling platform**, integrating credit management, blockchain payments, NFT transfer automation, card crafting (burn / merge) via bots, and automatic delivery of final cards to players.
Complete reverse engineering of the **game's internal API**, enabling automation of actions normally only accessible via the official client (account data, crafting, resource management, transfers, staking), without manual interaction with the game.Development ofadvanced orchestration botsfor managing **hundreds of thousands of NFTs owned by GAM**, intelligent asset distribution, activation of staking mechanics (MinPass), and massive operation automation.Main Stack:**C# / .NET** (bots & back-end), relational databases,Next.js / TypeScript front-end with Material UI
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Education
- D.E.U.G. Sciences, technologies, santé. Mention : INFORMATIQUEUniversité Perpignan Via Domitia2011
- Baccalauréat technologique. Série : Sciences et technologies industrielles. Spécialité : Génie électronique.Lycée Pablo Picasso2009