Freelancer profile translated to English.
Back to original languageAbout Antoine
I work exclusively in full remote (no hybrid / no on-site), CET/CEST time zone.
CTO / Tech Lead and senior full-stack engineer, I design and deliver web & mobile products (React, React Native, Node.js) and Web3 projects (Solidity/EVM smart contracts, as well as Rust/Solana/Anchor) with a "security-first" approach.
What I bring (CTO-level):
- Pragmatic architecture (scalable, maintainable), technical decisions, debt reduction
- Implementation/reinforcement of best practices (testing, CI/CD, code review, performance)
- Leadership: mentoring, recruitment/technical interviews, product/tech alignment
Intervention formats (remote):
1. **Sprint CTO / Architecture (5–10 days)**: audit, quick wins, delivery plan, roadmap & risks
2. **Smart contracts (build or review)**: design, implementation, testing, "engineering-grade" review
3. **CTO/Tech Lead on retainer**: steering + delivery + team upskilling
References / credibility signals:
Winner DemoDays Warsaw 2025
CTO/co-founder experience on several Web3 products + end-to-end delivery
For a quick response, please share: company + website + LinkedIn, scope, timeline, weekly workload, daily rate.
French
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- THE GUARDIANSFull-Stack DeveloperSOFTWARE PUBLISHINGAugust 2025 - December 2025 (4 months)Development of a mobile application for prestigious schools in Paris (e.g., Stanislas) to help students learn, correct their work, and self-evaluate through AI features and gamification (rewards). Development of a complex back-office with an AI system for prompt engineer workflow.
- ARZECTO CO-FOUNDERSOFTWARE PUBLISHINGOctober 2024 - Today (1 year and 8 months)Varsovie, PolandBuilding a Web3 ecosystem and SaaS solutions for payroll/invoicing and back-office automation (BI & financial services).CTO/Tech Lead role: product definition, architecture choices, technical steering and delivery (end-to-end).Development of web applications and Web3 integrations (wallet, SDK) with a strong focus on reliability and security.100% remote mission (CET/CEST).
- JUSAPMobile developerSOCIAL NETWORKSDecember 2024 - June 2025 (6 months)Cracovie, PolandDevelopment of the JUSAP mobile application in React Native and TypeScript (new social network, modern UX).Implementation of a maintainable codebase: architecture, reusable components, best practices (testing/CI).Product/design collaboration, continuous improvement of user experience and performance.100% remote mission (CET/CEST).
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Education
- RNCP Level 3 Title (Bac +2)3W Academy2018Formation en développement web : bases solides en architecture front/back, intégration web et bonnes pratiques. Fondamentaux : HTML/CSS, JavaScript, conception d’interfaces, APIs et logique serveur. Cette base a ensuite évolué vers des environnements modernes (TypeScript, React/Next.js, Node.js) et des architectures orientées produit.
- Blockchain DeveloperBlockchain Training Alliance2023Formation orientée smart contracts et développement Web3 : principes de sécurité, bonnes pratiques, tests et déploiement. Travail sur les standards et patterns courants (tokens, accès, événements, intégration dApps). Mise en application ensuite sur des projets réels : Solidity/EVM et écosystèmes Web3 (selon projets : Solana/Rust, wallets, SDK).
Certifications
- Hedera HashgraphBlockchain Training Alliance2023