Senior Backend Engineer

About the Role

Are you a Senior Backend Engineer who thrives on building high-performance architectures and scaling complex systems from scratch? We are looking for a Node.js/Nest.js expert to spearhead the development of our core, in-house platform, driving innovation across high-load environments. If you want to own your code, work with cutting-edge microservices, and make a tangible impact on a rapidly growing ecosystem, this is your next big move.

About the Client

Our partner is a tech company building product engineering across Fintech, iGaming, and Marketing. They turn innovative ideas into high-performing engines and launch them at scale. As their exclusive recruitment partner, Lionhires manages their full-cycle talent acquisition.

What You Will Do

• Architect and develop the core in-house platform, taking new, high-impact features from initial concept to production scale.

• Design and implement robust microservices and build seamless integrations with various third-party APIs.

• Optimize database performance for high-load systems, working extensively with both SQL and NoSQL solutions.

• Champion code quality by applying TDD (Test-Driven Development) principles and writing comprehensive automated tests.

• Collaborate cross-functionally to ensure scalability, reliability, and high availability across all backend services.

What You Bring

• Deep Backend Expertise: 5+ years of commercial web development experience, with a heavy focus on Node.js and Nest.js.

• Modern JavaScript Proficiency: Strong mastery of modern JavaScript and ECMAScript 6+ standards (TypeScript is a major plus).

• High-Load Database Management: Proven experience handling high-load database environments, specifically using MongoDB and MySQL.

• Advanced Communication Protocols: Practical experience implementing RESTful APIs, GraphQL, and WebSockets.

• Message Brokers & Caching: Hands-on experience working with RabbitMQ and Redis (experience with Nats is a plus).

• Architectural Mastery: Solid understanding of microservice architecture and version control via Git.

• Quality & Testing Mindset: Strong grasp of TDD principles and a habit of writing clean, testable code.

• Language Skills: Professional working proficiency in English (Intermediate level or higher).

Nice-to-Haves:

• 2+ years of hands-on experience working with CI/CD pipelines, containerization, and microservices.

• Direct experience with Kubernetes.

What's in It for You

• Financial Growth: Highly competitive salary with structured annual compensation reviews.

• Full Relocation Support: A complete relocation package including covered flight tickets and a 2-week hotel stay upon arrival.

• Legal Peace of Mind: Official EU/Spain employment contract, including registration and support for your family members.

• Work-Life Balance: 23 working days of paid annual vacation to ensure you rest and recharge properly.

• Professional Development: Continuous learning opportunities, challenging tasks, and language development support with partial class compensation.

• Culture & Community: Vibrant team-building activities, custom birthday gifts, and access to our upcoming Social Club featuring over 50 events per year.