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Senior Software Engineer at MLabs. Senior Software Engineer. Location: . US or EU (remote-first, office optional). Must be in the US, not Canada or in the European Union. France or Paris or as close as possible, always preferred.. Remote | Full-time. Compensation: . $160K - $240K. Our client is an industry-leading organization comprised of experts in blockchain technology, cryptography, infrastructure, and security. The organization is currently developing the foundational wallet infrastructure for the next generation of global finance.. The Senior Software Engineer will design, develop, and scale core backend services for a high-performance platform. This role involves full ownership of critical projects—ranging from APIs and microservices to databases and developer tooling—ensuring all systems remain fast, reliable, and secure. Beyond hands-on engineering, this individual will contribute to architectural decisions, refine development processes, and ensure infrastructure resilience under real-world financial workloads. This position requires close collaboration with product, security, and leadership teams to transform complex requirements into elegant, production-ready systems.. Key Responsibilities. System Development:. Design, build, and maintain secure, scalable backend services and RESTful APIs.. Architecture:. Architect databases and microservices optimized for performance, reliability, and long-term growth.. Project Ownership:. Manage the full software development lifecycle (SDLC), from initial requirements and implementation to production deployment and iteration.. Performance Optimization:. Troubleshoot complex technical issues, resolve performance bottlenecks, and ensure system resilience.. Engineering Excellence:. Contribute to CI/CD pipelines, observability, and the continuous improvement of development standards.. Cross-Functional Collaboration:. Partner with product and security teams on technical roadmaps and strategic direction.. Documentation:. Maintain comprehensive system documentation and support client-facing technical discussions.. Experience:. 8+ years of backend software engineering experience, specifically within the fintech or blockchain sectors.. Technical Proficiency:. Strong expertise in . TypeScript. , complemented by proficiency in at least one low-level language such as . Rust, Go, or C++. .. Infrastructure:. Proven track record of building scalable APIs, infrastructure, and developer tools.. Data & Cloud:. Expert-level knowledge of databases (PostgreSQL, DynamoDB, NoSQL) and AWS services.. Best Practices:. Skilled in microservices architecture, CI/CD pipelines, observability, and Secure Software Development Lifecycle (SSDLC) practices.. Security Knowledge:. Familiarity with applied cryptography, Public Key Infrastructure (PKI), and backend security fundamentals.. Soft Skills:. Strong problem-solving abilities, clear communication skills, and the capacity to deliver high-quality results under pressure.. Company Location: France.