• Conduct security audits on smart contracts, wallets and blockchains, and write high-quality audit reports • Develop automated scanning and monitoring tools for smart contracts, wallets and blockchains • Utilize scanning tools to detect vulnerabilities in online contracts and promptly issue risk warnings • Conduct post-mortem analysis on various hacking incidents, examining the causes, processes, prevention, correction and basic fund tracing • Proactively identify on-chain risks, monitor and model emerging on-chain attack vector trends, and possess a solid understanding of on-chain security risks such as fraud and phishing • Demonstrate a strong understanding of EVM and non-EVM blockchains and layer 2 solutions, and be familiar with DeFi design patterns • Perform a review analysis on newly disclosed vulnerabilities for smart contracts and summarize the root cause behind the exploits for early detection in the future • Demonstrate good understanding of cryptography and Security solutions which is utilized under blockchain products • Conduct Pen Testing and reviews for blockchain products and provide high quality feedback

• Use AI coding assistants as a primary development accelerator across the full lifecycle • Apply LLM-driven workflows for automated code review, test generation, and security analysis • Critically evaluate AI-generated Solidity and Rust code for security vulnerabilities • Identify and implement opportunities to integrate AI tooling into team workflows • Design, develop, and deploy smart contracts across EVM-compatible networks and Stellar • Build and maintain multi-chain deployment infrastructure and tooling • Test and audit smart contracts using formal verification tools • Collaborate with engineers, product partners, and designers to translate business requirements into robust on-chain solutions

• Lead design and prototyping of long-term solutions to address scalability, latency, and state growth challenges on the Polygon PoS network. • Drive architectural decisions across the PoS codebase, contributing to Geth, Cosmos SDK, or CometBFT-based systems as needed. • Identify and resolve deep technical issues in protocol behavior, consensus, and state sync. • Champion code quality, documentation, testing, and developer best practices across the team. • Mentor and support engineers across the stack to elevate the overall engineering bar. • Collaborate cross-functionally with protocol researchers, DevOps, security, and ecosystem teams to ship robust upgrades to the live network.

Role Description Nous développons une super-application crypto multi-chain innovante, conçue pour simplifier l’accès aux services Web3 et DeFi à grande échelle. Notre ambition : créer une plateforme sécurisée, performante et intuitive, intégrant les dernières avancées technologiques (MPC, Account Abstraction, microservices cloud-native). Dans ce contexte, nous recrutons un(e) Tech Lead / Architecte Solutions pour piloter l’ensemble de la vision et de l’exécution technique du projet. Vos missions : - Architecture & conception : - Définir l’architecture technique (HLD, LLD, ADR) - Concevoir des systèmes microservices scalables (API Gateway, Event Sourcing, CQRS) - Architecturer l’intégration multi-chain et blockchain (EVM & Solana) - Mettre en place des solutions de custody MPC (Fireblocks / Privy) - Implémenter les standards ERC-4337 (Account Abstraction) - Pilotage technique : - Encadrer une équipe de 2 à 5 développeurs - Arbitrer les décisions techniques stratégiques - Assurer la qualité du code (revues, sécurité, performance) - Superviser les intégrations API (DeFi, KYC, fiat, data) - Infrastructure & performance : - Piloter une architecture cloud-native (AWS EKS, Terraform, CI/CD) - Mettre en place observabilité et monitoring (Grafana, Prometheus…) - Anticiper les risques techniques et gérer leur mitigation - Coordination & communication : - Être l’interface technique principale avec le client - Assurer un reporting technique hebdomadaire - Accompagner la montée en compétences de l’équipe (mentoring, pair programming) Qualifications - 10+ ans en développement logiciel - 3+ ans en architecture de systèmes distribués - Expertise en blockchain & smart contracts (Solidity) - Maîtrise avancée de Node.js / TypeScript en production - Expérience en microservices & Kafka - Très bonne connaissance AWS (EKS, RDS, Terraform) - Expérience en leadership technique (5+ développeurs) Requirements - Connaissances appréciées : - ERC-4337 (Account Abstraction) - MPC / custody (Fireblocks, Privy) - Environnement fintech / néobanque - Réglementation crypto (MiCA) - Contributions open-source Web3 - Langues : - Français courant - Anglais professionnel Benefits - Projet à fort impact dans l’écosystème Web3 / DeFi - Stack technique de pointe (MPC, multi-chain, cloud-native) - Équipe senior et culture d’excellence technique - Remote-friendly avec grande flexibilité - Participation active aux décisions stratégiques (ADR) - Formation continue (conférences, certifications) Company Description Pour postuler, merci de fournir : - CV à jour - Lien GitHub / projets (si disponible) - Court message de motivation - Disponibilité Envoyer à : contact@digihmb.com