Freelancer profile translated to English.
Back to original languageAbout Sami
Software engineer specialized in designing end-to-end solutions, from firmware for constrained IoT devices to cloud backends, web/mobile applications, and Web3 products.
Graduated in MIAGE (Aix-Marseille University), with experience ranging from Full-Stack development at GRDF to industrial IoT engineering at Stealth Power (Austin, Texas). Work performed: Nordic nRF91/nRF52 firmware under Zephyr, multi-MCU FOTA/OTA pipelines, advanced energy management, AWS cloud supervision, and React/React Native applications for real-time fleet and energy system monitoring.
In the Web3 ecosystem, focus on concrete products integrated with Worldchain, particularly via World App mini-apps:
UMAN – Identity & Reputation mini-app where users link their social accounts (X, Telegram, Discord…) to their World ID to prove not only that they are human, but which human they are. Over 43M impressions, 95k users, and approximately 15k weekly active users.
Wealth Hub – RWA investment mini-app simplifying access to real assets for emerging markets. Results: 20M impressions, 80k users, and approximately 15k active weekly users.
Also working on AI-assisted analytics tools: agents capable of querying databases, generating on-demand visualizations, and producing reports using RAG and LLMs connected to production data.
Main stack: TypeScript/JavaScript, Solidity, Rust, Python, React/React Native, Node.js, PostgreSQL, AWS, as well as C/C++ for embedded (nRF, PIC). Strong exposure to EVM/Solana ecosystems, wallets, bridges, and DeFi protocols.
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 50km), Lyon (up to 50km), Marseille (up to 50km), Aix-en-Provence (up to 50km), Nîmes (up to 50km)
Experience
- Stack'n FI - RemoteCo-founder & Lead EngineerTECHJune 2025 - Today (1 year)RWA investment application (80k+ users, 15k WAU, $30k TVL/week). 100% decentralized & self-custodial. Design of the Worldchain ↔ Solana multi-chain architecture for tokenized stock purchase, RWA access, and WLD → USDC bridge.-Integration with World App via Worldcoin Minikit: connection with World Wallet and WLD payments directly from the wallet.-Implementation of Solana flows: self-custodial Worldchain → USDC bridge via LiFi/CCTP, swaps via Jupiter, Solana ↔ Worldchain bridge, gas sponsoring, ATA management (creation/closing) and rent fees, with on-chain monitoring (Alchemy / Helius).-Implementation of the Privy wallet layer (Solana/EVM), connecting World Wallet to Privy via SIWE/JWT and managing client-side transaction signing.-Full-stack development: React/Next.js frontend (and Node.js/TS backend)
- STEALTH POWERSoftware EngineerENERGY AND UTILITIESMay 2024 - November 2025 (1 year and 6 months)Austin, TX, USADesign and development of embedded firmware under Zephyr OS for nRF9160 (LTE-M) and nRF52840 (BLE).- Replacement of Embedded Planet module ($295) with Fanstel ($74): 75% reduction in BOM cost per unit.-Implementation of a multi-MCU FOTA pipeline (BLE → nRF52 → nRF91 → PIC24FJ) with rollback and partitioning, improving update speed by 60%.-Optimization of the LTE-M modem and data flow of the nRF9160: -50% latency.-Design of the BLE layer and battery control logic (piloting, voltage profiles, security mechanisms), in coordination with electrical and electronic teams to validate protection mechanisms.-Development of the web & mobile solution: React / React Native platform and Node.js backend for device control, BLE/UART FOTA, and data visualization
- Sopra Steria – Mission pour Dassault AviationFull Stack Developer (CDD)AVIATION AND AEROSPACEDecember 2023 - April 2024 (4 months)Aix-en-Provence, FranceDesign and development of application modules for Dassault Aviation's internal tools, on a Java/JavaScript full-stack, within an agile team.-Design and development of new front/back modules, improving existing functionalities and aligning them with Dassault Aviation's business needs (Angular / ReactJS on the front, Java/Spring & Node.js on the back).-Bug fixing and technical debt resolution across the entire stack (web interfaces, REST services, database access), with a focus on code stability and maintainability.-Design and implementation of JUnit unit tests to secure evolutions, ensure release reliability, and strengthen software quality.-Use of UML modeling for technical design (class diagrams, sequence diagrams, flow diagrams) and to clarify exchanges with functional and technical teams.-Active participation in code reviews and continuous improvement rituals (clean code, refactoring, CI/CD best practices).
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Education
- Master in Information Technology Methods Applied to Business ManagementAix-Marseille University2023Master Méthodes Informatiques Appliquées à la Gestion des Entreprises
- Bachelor's Degree in Information Technology Methods Applied to Business ManagementAix-Marseille University2021Licence Méthodes Informatiques Appliquées à la Gestion des Entreprises