Source: CrawlJobs

Backend Engineer

Holaluz Barcelona, Spain
Full-time On-site work

Publication date: 03/11/2026

Are you passionate about solid software architecture and seeking challenges in large-scale projects? Join our team as a Backend Engineer and contribute to the construction of innovative technological solutions. You will develop robust and scalable backends, applying SOLID principles, DDD, and hexagonal architecture.

Responsibilities

Design and develop scalable and maintainable backends using SOLID and DDD principles; Model domain entities and objects, applying appropriate naming and design patterns; Implement RESTful APIs following best practices and ensuring clear documentation; Utilize dependency management tools (Composer, Maven, Gradle) to manage libraries and frameworks; Write comprehensive unit and integration tests to ensure code quality; Practice TDD to ensure agile and high-quality development; Implement hexagonal architectures to separate business logic from infrastructure; Work with distributed systems, using Docker to containerize applications; Interact with relational and non-relational databases, optimizing data access; Implement asynchronous communication solutions using queues and events; Deploy applications to the cloud using platforms like AWS, Azure, or Google Cloud; Explore and utilize serverless services to optimize costs and scalability; Collaborate closely with the product development team and other stakeholders; Effectively communicate technical decisions and project progress; Perform continuous refactoring to improve code quality and architecture; Implement robust logging and exception handling mechanisms

Requirements

At least one backend programming language (Java, Python, Node.js, etc.); Relational (MySQL, PostgreSQL) and non-relational databases; SOLID principles, DDD, hexagonal architecture, and design patterns; TDD and BDD; Docker and container orchestration; Cloud computing (AWS); RESTful APIs; Microservices development; Distributed systems; Asynchronous communication; DevOps and CI/CD; Effective communication; Teamwork; Proactivity and problem-solving skills

Nice to have

Knowledge of other programming languages (scripting and compiled); Experience with serverless systems; Contributions to open source projects; Advanced English

Benefits

Challenging projects; Teamwork; Professional development; Cutting-edge technology
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