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 hab

📌 Senior Backend Developer (Valencia)
🏢 LionHires Recruitment
📍 Valencia