Senior Backend Developer

About the Position

We are looking for a Senior Backend Developer to join our Backend team at Red Tiger, a dynamic and self-contained team within the Evolution ecosystem. Based in Sofia, Bulgaria, our team of 200 talented professionals excels in product inception, development, and more. As a Senior Backend Developer, you will be a core technical contributor responsible for driving the architecture, scalability, and domain modeling of our high-concurrency Online Gaming & Betting Platform.

Responsibilities

• Architect, design, and write high-performance, fault-tolerant PHP code utilizing Domain-Driven Design (DDD) and SOLID principles.
• Lead domain modeling discussions, define Bounded Contexts, and establish a Ubiquitous Language between technical and business domains.
• Maintain rigorous code review standards to enforce code quality, architectural consistency, and system security.
• Drive continuous performance tuning, database optimization, and refactoring of legacy components.
• Mentor and guide junior and mid-level developers, fostering continuous technical growth within the team.
• Partner with QA, DevOps, and Product leadership to ensure rapid, reliable deployment of critical backend services.

Requirements

• Extensive hands-on experience in advanced PHP software development (PHP 7.4+, PHP 8.x).
• Practical experience applying Domain-Driven Design (DDD) concepts (e.g., Aggregates, Entities, Value Objects, Domain Events, Repositories, Bounded Contexts).
• Strong expertise in core PHP and custom architecture patterns without over-reliance on framework abstractions.
• Advanced experience with MySQL / MariaDB optimization, query tuning, indexing strategies, and handling heavy transaction loads.
• Deep knowledge of Docker, container orchestration, and modern containerized deployment strategies.
• Proven track record of designing, building, and maintaining high-throughput, low-latency RESTful APIs.
• Solid experience with JavaScript / Node.js for microservices or real-time event processing.
• Mastery of OOP principles, SOLID guidelines, design patterns, and clean code principles.
• Experience with automated testing, TDD/BDD practices (Codeception, PHPUnit).

Nice to Have

• Experience with event-driven architectures and message brokers (RabbitMQ, Kafka).
• Expertise in caching layers (Redis, Memcached) and high-load database architecture (replication, sharding).
• Familiarity with web server administration and optimization (Nginx, Apache).
• Experience in the Online Gaming, FinTech, or high-frequency transactional domain.

We Offer

• Environment tailored to allow you to realize your full potential.
• Challenging work in a dynamic international team.
• Company funded training.
• Flexibility on working hours.
• Multisport/Coolfit card.
• Additional health insurance.

About the Company

We’re Red Tiger, a dynamic and self-contained team within the vast Evolution ecosystem, thriving with 200 talented professionals based in Sofia. Our expertise spans from product inception to final development, covering product, art, development, and more. Proudly 100% made in Bulgaria, we take immense pride in our achievements, adaptability, and the high quality of our games.