Senior Backend Developer (Node.js)

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.
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.
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