Senior Back-End Developer (Node.JS)

About the Role Are you a seasoned Backend Engineer who excels at scaling high-load architectures, optimizing complex databases, and crafting clean, testable code? We are looking for a Senior Backend Engineer (Node.js/Nest.js) to join our partner's engineering team on-site in Ras Al Khaimah, UAE . If you thrive on solving sophisticated database bottlenecks, building resilient microservices from scratch, and handling Big Data in a high-concurrency environment, this is your next big career move. About the Client Our partner is a dynamic tech powerhouse building cutting-edge product engineering solutions across Fintech, iGaming, and Marketing. They excel at turning innovative concepts into high-performing engines and launching them at global scale. As their exclusive recruitment partner, Lionhires manages their full-cycle talent acquisition, connecting top-tier tech talent with this fast-growing, ambitious team. What You Will Do Architect & Develop: Build and maintain robust in-house backend platforms using Node.js and Nest.js within a high-performing microservices architecture. Database & High-Load Optimization: Solve complex DB performance bottlenecks by debugging queries, managing index strategies, leveraging data partitioning, and optimizing high-load SQL/NoSQL databases (MySQL, MongoDB). API & Service Integration: Design and implement high-throughput third-party API integrations, working with REST, GraphQL, and WebSockets. Guard Reliability & Quality: Write clean, testable, and maintainable code following TDD principles, utilizing Redis and RabbitMQ to ensure maximum system reliability. Collaborate & Scale: Work closely with cross-functional teams to design, normalize, and continuously improve scalable data systems. What You Bring Proven Experience: At least 5 years of commercial web development experience, with 5+ years focused specifically on Node.js and Nest.js. Database Mastery: Hands-on experience managing relational/NoSQL DBs and Big Data, with a deep understanding of table indexing, the DB Query Planner, normalization principles, and query optimization. Architecture & Messaging: Strong knowledge of microservice architecture, REST, GraphQL, WebSockets, RabbitMQ, and Redis. Engineering Standards: Solid proficiency in ES6+, Git version control, and Test-Driven Development (TDD). Communication: Intermediate (or higher) English proficiency with strong problem-solving capabilities and collaborative skills. Bonus Points For: Hands-on experience with TypeScript. 2+ years of experience working with CI/CD pipelines, containerization, and Kubernetes. Practical experience using NATS. What's in It for You Financial Growth: Highly competitive remuneration level with structured annual performance reviews. Global Mobility: Full relocation support to Ras Al Khaimah, UAE (including flight tickets, up to 2 weeks of hotel accommodation, and visa support for you and your family members). Work-Life Balance: 21 non-business days of paid annual vacation plus 6 fully paid sick days. Professional Growth: Opportunities to tackle high-load technical challenges and company-supported language development initiatives. Culture & Perks: Regular team-building activities in a collaborative, supportive tech environment. Our Recruitment Process We respect your time and aim to keep our process transparent and efficient: Initial Screen: A casual conversation with a Lionhires Recruiter to discuss your background and expectations. Technical Assessment: A practical evaluation via HackerRank. Technical Interview: A deep-dive discussion with our partner’s Technical Team. Final Interview: A strategic conversation with the Hiring Leads. Offer: Welcome aboard! (Please note: This is a full-time, on-site role in Ras Al Khaimah, UAE. Remote or hybrid options are not available for this position.)