Senior Software Engineer, Backend (Contractor - Remote within Europe)

<h3>Company Description</h3><p>Welcome to Byborg! As a leader in IT and streaming solutions, we specialize in delivering high-quality services that offer premium online experiences.<br/> Headquartered in Luxembourg and operating globally, our company is proud of its diversity, with over 40 different nationalities working side by side. Since its launch, our flagship product has led the market, continually pushing the boundaries of digital innovation. Today, working with the latest technology, our platforms serve millions of users daily.<br/> We are proud of our dynamic portfolio, featuring over 16 leading and fast-growing brands. These include our streaming platforms (LiveJasmin.com, Cherry.TV, IsLive.com, Oranum.com), our marketing and advertising services (AdSupply, AWEmpire, TwinRed), and our entertainment and lifestyle brands (LoyalFans.com, The Million Roses, Kinkly.com).<br/> Are you looking for new challenges in an international, collaborative environment? The Byborg squad is seeking passionate individuals ready to make an impact. Join us in our inclusive workplace where you will be appreciated, and you can grow and achieve your potential. Help us shape the future!</p><h3>Job Description</h3><p>We are looking for skilled <strong>Backend Engineers</strong> with a strong problem-solving mindset, excellent programming skills (especially with <strong>PHP</strong>), and a solid grasp of system design principles. As a Backend Engineer, you’ll work closely with our engineering teams to tackle technical challenges and drive innovative enhancements to our products.</p><p>In this role, you will:</p><ul><li>Design and implement high-quality software architecture with a focus on scalable solutions for high-load and high-concurrency environments.</li><li>Write clean, well-documented, and maintainable code following industry best practices, ensuring code quality, performance, and scalability.</li><li>Collaborate with cross-functional teams, including frontend developers, designers, and product managers, to deliver robust and scalable solutions.</li><li>Propose, evaluate, and integrate new technologies, frameworks, and methodologies to improve development efficiency and product quality.</li><li>Troubleshoot, debug, and resolve complex technical issues, optimizing systems for high load and concurrency.</li><li>Participate in code reviews, providing constructive feedback to peers, and continuously promote coding standards and best practices.</li><li>Contribute to team efficiency through the development of documentation and processes that foster continuous improvement.</li></ul><h3>Qualifications</h3><p><strong>Technical Skills:</strong></p><ul><li><strong>Backend Development &amp; Expertise:</strong> Proven experience as a Backend Developer with <strong>3-5 years</strong> in professional web application development, specializing in building systems designed to handle high-load and high-concurrency traffic. With strong proficiency in <strong>PHP (at least 2-3 years)</strong> and hands-on experience in frameworks like Symfony as a plus<strong>.</strong></li><li><strong>Database Management:</strong> Solid experience with both relational (e.g., MySQL, PostgreSQL) and NoSQL databases, with expertise in writing optimized SQL queries.</li><li><strong>API Development:</strong> Experience in designing and building RESTful APIs; familiarity with GraphQL is a plus.</li><li><strong>Concurrency and Load Handling:</strong> Expertise in creating systems optimized for concurrency, including caching, load balancing, and horizontal scaling techniques.</li><li><strong>Testing and Code Quality:</strong> Practical knowledge of Test-Driven Development (TDD) and Behavior-Driven Development (BDD), with experience writing unit and integration tests.</li><li><strong>Version Control:</strong> Proficiency in Git and modern version control systems.</li></ul><p><strong>DevOps and Infrastructure:</strong></p><ul><li><strong>CI/CD Pipelines:</strong> Familiarity with CI/CD pipeline setups and automation using tools like Jenkins or Atlassian Bamboo.</li><li><strong>Containerization:</strong> Experience with Docker/Podman and maintaining reproducible development environments.</li><li><strong>Security:</strong> Knowledge of backend security best practices, including secure authentication, authorization, and data protection.</li></ul><p><strong>Soft Skills:</strong></p><ul><li><strong>Problem-Solving:</strong> Strong analytical skills for debugging and resolving complex technical issues.</li><li><strong>Collaboration:</strong> Excellent communication skills, with experience working effectively in team-oriented and agile environments.</li><li><strong>Agile Development:</strong> Familiarity with agile methodologies (e.g., Scrum, Kanban) and the ability to adapt to a fast-paced, iterative work environment.</li></ul><p><strong>Nice to Have</strong></p><ul><li><strong>Additional Database Technologies:</strong> Knowledge of Elasticsearch and OpenAPI (preferab