Senior Backend Developer

Company Description 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.

Job Description As a Senior Backend Developer in our Backend team, you will be a core technical contributor responsible for driving the architecture, scalability, and domain modeling of our high-concurrency Online Gaming & Betting Platform . Working alongside our Backend Architect and Engineering Lead, you will shape the future of our high-throughput platform, which processes real-time betting operations and high-volume financial transactions globally.

In this role, you will apply Domain-Driven Design (DDD) principles to model complex business domains into clean, maintainable, and decoupled microservices. You will lead technical design sessions, mentor junior and mid-level engineers, conduct rigorous code reviews, and drive performance optimizations across our RESTful API services, databases, and Docker-based environments.

Mission & 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.

Qualifications

• 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).

Advantages:

• 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.

Additional Information

Tech Stack & Tools:

• Primary Programming Languages: PHP (7.4+), JavaScript / Node.js (21+)
• Database Management: MySQL / MariaDB (10.4+)
• Containerization & Infrastructure: Docker
• Architecture & Protocols: REST APIs, JSON
• Version Control & Collaboration: Git / GitLab

What 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.