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Principal Software Engineer - Blockchain Wallet InfrastructureLocation: Remote - Location: European Union (remote-first, office optional) Paris/ France is always preferred. Or as close as possible.Compensation: $145K - $240KWe are a stellar team of leaders and experts building the backbone of blockchain wallet infrastructure for the next financial era, specializing in cryptography, security, and distributed systems. We are seeking a Principal Software Engineer to lead the design, development, and scaling of our core backend systems. This is a high-impact, leadership role focused on making key architectural decisions and ensuring our platform is fast, resilient, and secure under the high-stakes demands of financial workflows.You will own mission-critical projects end-to-end, acting as a technical leader who drives engineering standards and the long-term vision. This role involves deep technical execution alongside strategic collaboration with product, security, and executive leadership to align technical roadmap with business goals.Responsibilities:Architectural Leadership: Lead the design and development of scalable, secure backend services and APIs, and define and evolve architecture for databases, microservices, and integrations.Project Ownership: Own mission-critical projects end-to-end, from requirements gathering and design through production deployment and iteration.Performance & Reliability: Troubleshoot and resolve complex performance and reliability challenges at scale.Engineering Excellence: Drive improvements to CI/CD, observability, and engineering processes across teams, promoting best practices and quality standards.Strategic Alignment: Collaborate with leadership to shape roadmap priorities and long-term technical vision.Mentorship: Mentor senior engineers, share knowledge, and represent the technical direction in client discussions.Experience: 10+ years of backend software engineering experience, with significant leadership experience in fintech or blockchain.Language Mastery: Mastery of TypeScript plus one or more systems languages (e.g., Rust, Go, C++).Platform Building: Proven track record building scalable APIs, infrastructure, and developer platforms.Data & Cloud: Deep expertise with databases (PostgreSQL, DynamoDB, NoSQL) and cloud services (AWS).Methodology: Strong knowledge of microservices, CI/CD pipelines, observability, and Secure Software Development Lifecycle (SSDLC).Security: Familiarity with applied cryptography, PKI (Public Key Infrastructure), and secure backend architectures.Leadership Skills: Exceptional problem-solving, communication, and demonstrated ability to influence technical direction across the organization.Compensation: Highly competitive salary range of €120,000–€200,000 per year plus generous equity (150–300 stock options vested over 4 years).Location & Flexibility: European Union (Remote-First), with optional office space.Health & Retirement: Comprehensive Healthcare and pension plan, plus coverage for travel expenses.Equipment: Provided with a MacBook Pro + essential equipment.Impact: Opportunity to define the technical backbone of next-generation blockchain wallet infrastructure.Due to the high volume of applications we anticipate, we regret that we are unable to provide individual feedback to all candidates. If you do not hear back from us within 4 weeks of your application, please assume that you have not been successful on this occasion. We genuinely appreciate your interest and wish you the best in your job search.Commitment to Equality and Accessibility:At MLabs, we are committed to offer equal opportunities to all candidates. We ensure no discrimination, accessible job adverts, and providing information in accessible formats. Our goal is to foster a diverse, inclusive workplace with equal opportunities for all. If you need any reasonable adjustments during any part of the hiring process or you would like to see the job-advert in an accessible format please let us know at the earliest opportunity by emailing human-resources@mlabs.city.MLabs Ltd collects and processes the personal information you provide such as your contact details, work history, resume, and other relevant data for recruitment purposes only. This information is managed securely in accordance with MLabs Ltd’s Privacy Policy and Information Security Policy, and in compliance with applicable data protection laws. Your data may be shared only with clients and trusted partners where necessary for recruitment purposes. You may request the deletion of your data or withdraw your consent at any time by contacting legal@mlabs.city. #J-18808-Ljbffr
