Role Description We are hiring on behalf of our client, a fast-paced, dynamic, and fully remote team in the decentralized finance (DeFi) and Web3 space who is seeking an experienced Senior Backend Engineer. The employer operates with an ambitious roadmap and a strong commitment to engineering rigor, high-grade security, and rapid execution. As a Senior Backend Engineer, the selected candidate will play a critical role in designing, developing, and maintaining robust, high-throughput, and scalable backend systems. This role extends beyond writing code to architecting resilient, secure systems optimized for low-latency, real-time processing in financial services. Key Responsibilities - Backend Development: - Design, develop, and maintain core backend systems powering high-throughput trading, exchange, and network infrastructure using clean, efficient, and maintainable code. - Index on-chain data into event queues and persistence layers to serve WebSockets and scalable APIs consumed by user interfaces and risk dashboards. - System Architecture: - Define the high-level backend structure, data flow, and interactions between components, focusing on event-driven architecture and messaging patterns common in financial systems. - Reliability, Performance & Availability: - Ensure architectural designs meet strict performance, high availability, and reliability standards. - Implement failover mechanisms, redundancy strategies, and disaster recovery plans to minimize potential downtime. - Security: - Implement and maintain robust security measures to protect backend infrastructure and APIs against DDoS attacks, data breaches, injection vulnerabilities, and other threat vectors. - Data Storage Strategy: - Define data storage strategies and select appropriate databases and models tailored for financial applications. - Evaluate trade-offs across relational databases, key-value stores, and messaging queues. - Testing Strategy: - Develop and execute a comprehensive testing strategy covering unit, integration, security, load, and performance testing. - Collaborate with the broader engineering team to establish test reporting and maintain standardized testing processes. - Technological Evaluation & Documentation: - Stay informed on emerging backend technologies, evaluating new tools, frameworks, and methodologies to elevate system performance and scalability. - Document architectural designs clearly for both technical team members and non-technical stakeholders. - Code Review & Team Collaboration: - Participate in code reviews, mentor engineering team members, and enforce coding standards and best practices. - Collaborate closely with cross-functional teams, including on-chain engineers, frontend developers, product managers, quantitative specialists, and executive leadership. Qualifications - Experience: 8+ years of backend engineering experience within the financial services industry. - Core Languages: 6+ years of hands-on experience using Rust or C++ to build highly scalable web services. - Concurrency: Mastery of asynchronous programming and advanced concurrency patterns, with an emphasis on thread safety and lock-free data structures. - Databases: 6+ years of experience designing and maintaining relational databases (e.g., PostgreSQL). - Messaging & Caching: 4+ years of experience with low-latency persistence and messaging technologies (e.g., Kafka, Redis, RabbitMQ). - High Availability: Proven track record of building and maintaining high-availability systems managing significant transaction volumes. - Security: Strong proficiency in securing and hardening backend systems and APIs against evolving security threats. - Testing & Cloud: Strong knowledge of software testing methodologies alongside experience with cloud platforms (AWS, GCP, or Azure) and containerization tools (Docker, Kubernetes). - Communication: Excellent verbal and written communication skills with the ability to work effectively in a collaborative, remote environment. Preferred Qualifications - Experience with low-level network programming, including asynchronous I/O, direct socket programming, and Linux kernel optimizations (e.g., epoll, zero-copy, or kernel bypass techniques). - Hands-on experience fine-tuning latency-sensitive components in trading systems, such as order-matching engines and risk engines. - Familiarity with blockchain technology, smart contracts, and decentralized systems. - Fundamental understanding of finance and derivatives trading. Ideal Profile Fit - Comfort operating within a compact, agile team navigating complexity, unknowns, and technical ambiguity. - Enthusiasm for rapid prototyping, iterative development, and building the future of financial technology. Work Setup - 100% remote working environment. - High-impact technical ownership within a cutting-edge DeFi/Web3 ecosystem. - Collaborative, performance-driven culture with high standards for engineering excellence. 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.

• Design, build, secure, and maintain core platform for access management • Share operational ownership of the product • Participate in rotational on-call support schedule • Collaborate with other engineers to deliver user stories • Develop automated tests and improve continuous integration operations

• Architect and build foundational backend systems with a focus on performance, scalability, and reliability • Drive strategic technical direction for complex, cross-team initiatives • Establish and evolve platform best practices, frameworks, and architectural standards • Provide deep technical mentorship and guide design decisions • Shape the team's technical roadmap by collaborating with engineering leadership • Embed AI into engineering and operational practices for improvements

• Designing and building the core infrastructure that connects services across Canva's backend engineering org • Leading a major migration of how our backend services communicate, working closely with partner engineering teams & leaders • Driving support for more languages and frameworks so more teams can build natively on our platform • Owning the reliability, performance and correctness of systems that sit in the critical path for the whole engineering org • Mentoring engineers and helping raise the technical bar across the team