Software Engineer - Backend Developer
Location: Sofia
Overview of the Role
We are looking for a skilled Backend Developer with experience in Node.js or PHP (Laravel) to join our team. You will work on building and maintaining scalable backend applications and services, contributing to a robust and high-performance infrastructure that powers a seamless user experience across our platforms.
You will develop backend services in Node.js and support/improve existing PHP/Laravel (Nova) systems as needed. You’ll collaborate closely with other engineers, participate in technical discussions, and help evolve our backend architecture and best practices. You will own the performance and stability of mobile backend services: ensure all APIs operate efficiently, proactively identify and resolve issues, drive rapid incident resolution, and be accountable for service reliability, uptime, and seamless integration with mobile applications.
This role is ideal for someone who enjoys clean, maintainable code, API design, and continuous improvement. Experience with distributed systems, microservices, state management, and performance optimization is highly valued. Familiarity with cloud technologies, message brokers (e.g., Kafka), and caching systems (e.g., Redis) is a strong advantage.
What you’ll do:
Develop and maintain scalable backend services and APIs using Node.js and PHP/Laravel (Nova)
Collaborate with mainly mobile developers, DevOps engineers, product owners, and other stakeholders to deliver robust and secure backend solutions
Participate in technical design discussions and continuously improve backend architecture and performance
Design and implement RESTful APIs and integrations, including real-time features (e.g., WebSockets) when needed
Integrate with databases (SQL and NoSQL), message brokers, third-party services, and external APIs
Write clean, reusable, and testable code, Unit tests and help maintain high standards for code quality through reviews
Debug and optimize backend systems for performance, scalability, and security
Maintain technical documentation and API guidelines
Perform related duties as assigned
What you’ll bring:
5+ years of professional software engineering experience, with strong hands-on in backend development
2+ years of backend experience in either Node.js (typescript) or PHP (Laravel; Laravel is a plus)
Solid experience designing and integrating RESTful APIs (SOAP exposure is a plus).
Strong grasp of backend architecture, scalability, microservices, and API security best practices
Proficiency with Git and collaborative workflows (GitHub/GitLab); familiarity with Agile processes
Experience with testing (unit, integration, end-to-end) using tools such as Jest, Mocha, Supertest, or equivalents
Familiarity with CI/CD pipelines, containerization (Docker), and orchestration (Kubernetes)
Experience with cloud platforms (preferably AWS; GCP/Azure also valued)
Experience optimizing backends for scalability, maintainability, and performance
Understanding of authentication and authorization mechanisms (OAuth2, JWT, OpenID Connect)
Knowledge of relational (PostgreSQL, MySQL)
Proficient with Git and collaborative Git-based workflows. Experience with monorepo setups is a plus
Understanding of security principles for web and API development (e.g., OWASP Top Ten)
Proficient in written and verbal English communication
Nice to have:
Good grasp of microservices, distributed systems, and asynchronous processing (queues; Kafka/RabbitMQ)
Non-relational (MongoDB, Redis) databases
Familiarity with infrastructure as code tools (e.g., Terraform, CloudFormation) is a plus
Why choose us:
Aside from a generous base salary, we have a fantastic benefits & rewards program that is designed to encourage personal and career development.
30 days paid leave
Health and Dental Insurance for you, your partner and your children (if you all live at the same address)
Personal life insurance and disability coverage
Wellbeing fund
A sports’ card membership valid across the country
Discounts as a compliment form us among different services
Monthly food vouchers
Free snacks, fruits and drinks in the office
Equal opportunities:
At Flutter we are committed to creating an inclusive environment where our people can be their authentic selves and thrive. We embrace and celebrate diversity, respecting all our uniqueness and differences.
We welcome you to let us know whether you have any accessibility needs. All you need to do is email us at talent@flutterint.com . Your journey with us is focused on ensuring you have what you need to be your best self.
Learn more about the works we are doing on Inclusion and Belonging here: https://careers.flutterinternational.com/working-at-flutter-international/diversity-equity-inclusion/
The group:
Flutter CEE is a proud member of the Flutter Entertainment family, a global leader in sports betting, iGaming, and entertainment. We're not just another company; we're listed on both the prestigious FTSE 100 index on the London Stock Exchange and the New York Stock Exchange (NYSE). What sets us apart is our world class brands, cutting-edge products, and our International division includes our operations in over 100 global markets and offers sports betting, casino, poker, rummy and lottery, mainly online. What truly defines us is our commitment to ensuring that the excitement of gaming and entertainment is experienced in a responsible and sustainable way. Our remarkable team of over 8,000 colleagues drives this vision, spread across 28 offices worldwide.