Blockchain Architect Expert

Location: Remote Work Modality: 100% Remote (Europe & Latin America) About the Opportunity At 5411 Hub, a headhunting firm specialized in executive and highly technical roles across LATAM, the U.S., and Europe, we are partnering with a leading global company in the blockchain and decentralized technology space to recruit a Blockchain Architect Expert. This role sits at the core of the company’s next growth stage and will work closely with the Director of Architecture. The position is critical for shaping the technical vision, ensuring architectural robustness, and driving scalable, secure, and decentralized solutions built on Bitcoin-related technologies. The Role As a Senior Blockchain Architect, you will lead architectural design and evaluation, address complex technical challenges, and guide development teams to ensure strong alignment with architectural principles. You will play a key role in researching emerging technologies, advising stakeholders, and assessing the technical and

business impact of architectural decisions. Key Responsibilities Architect end-to-end blockchain solutions leveraging the company’s products and ecosystem. Assess, design, and improve existing and in-progress system architectures. Identify and resolve technical challenges with a strong focus on security, scalability, and decentralization. Guide and mentor development squads to ensure architectural consistency and best practices. Research emerging blockchain technologies and propose relevant improvements. Communicate technical risks, challenges, and trade-offs to stakeholders. Evaluate the business impact of technical decisions. Provide regular updates on product evolution, costs, and budgets. What You Bring Technical Expertise 5+ years of experience in the Web3 ecosystem, with recent years focused on architecture. 4+ years of hands-on Solidity experience, including strong knowledge of EVM opcodes. Solid experience with Java, including analyzing complex codebases and contributing code when needed. Experience with Rust and JavaScript is a strong plus. Deep understanding of Bitcoin, including consensus rules, P2P networking, transaction formats, and the UTXO model. Strong knowledge of Bitcoin Script, including standard and non-standard use cases, covenant proposals, and trade-offs in UTXO-based design. Familiarity with the Lightning Network, Bitcoin Layer-2 solutions, and interoperability approaches. Deep understanding of applied cryptography in blockchain systems (ECDSA, Schnorr, hash functions, Merkle trees, multisig and threshold schemes). Proven experience designing secure protocols and identifying vulnerabilities in smart contracts and blockchain applications. Familiarity with consensus algorithms (e.g., Nakamoto, PBFT, Gasper) and Sybil-resistance mechanisms (PoW, PoS, DPoS). Experience reviewing, auditing, and optimizing EVM-compatible smart contracts (gas optimization, upgradeability, access control, and security best practices). Problem Solving & Innovation Strong ability to proactively solve complex technical challenges. Analytical mindset to evaluate technical decisions and their business impact. Passion for staying ahead of blockchain trends and introducing innovative protocols and technologies. Leadership & Collaboration Excellent communication and presentation skills, able to translate complex concepts for technical and non-technical audiences. Strong organizational and time-management skills. Ability to thrive in a global, diverse, fully remote environment. Education & Languages Bachelor’s degree in Computer Engineering or equivalent practical experience. Fluent English required; Spanish is a plus. What’s Offered Competitive compensation package with attractive benefits. 100% remote work from Europe or Latin America, with access to global coworking spaces. Strong work-life balance, including generous vacation, sick leave, and parental leave policies. Continuous learning opportunities: training programs, language courses, and annual learning sponsorship. Opportunity to work on cutting-edge blockchain and decentralized technology projects within a global team. Monthly allowance for contractors to support connectivity and well-being.