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Principal Software Engineer - EU at MLabs. Principal Software Engineer - Blockchain Wallet Infrastructure . Location:. Remote - Location: European Union (remote-first, office optional) Paris/ France is always preferred. Or as close as possible.. Compensation: . $145K - $240K. Join 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. Our client is seeking a . Principal Software Engineer. to lead the design, development, and scaling of their core backend systems. This is a high-impact, leadership role focused on making key architectural decisions and ensuring their 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.. Company Location: France.