Senior Backend Developer

Build the backend services behind a real-time gaming platform processing tens of thousands of messages every second.

Paris France Permanent On-site

• Designing highly available backend architecture for a real-time transactional platform
• Building and maintaining scalable microservices using server-side JavaScript
• Developing APIs and data models used by the platforms core services
• Contributing to a communication gateway handling authentication flow control routing and asynchronous messaging
• Developing user registration services capable of absorbing significant traffic peaks
• Adding new functionality and mechanics to the platforms core engine
• Improving application performance scalability and resource usage
• Designing automated unit functional integration and load tests
• Reviewing code and contributing to shared engineering standards
• Deploying services on managed cloud infrastructure
• Implementing monitoring and investigating production performance
• Maintaining technical and architectural documentation
• Working with frontend data infrastructure security and project teams

• A communication gateway processing tens of thousands of messages per second
• Event-driven services where ordering retries duplicate messages and partial failures must be managed explicitly
• Server-side JavaScript used for concurrent high-throughput systems beyond standard web applications
• Services that must absorb sudden traffic peaks without affecting availability
• Asynchronous messaging and in-memory data structures supporting real-time application flows
• Relational databases operating under concurrent transactional workloads
• Query optimisation transaction boundaries and lock management under contention
• Caching and load-distribution decisions that directly affect performance and consistency
• A modular platform requiring continuous availability and strict protection of user data

• 5 years of experience building and operating backend services in production
• Strong experience with server-side JavaScript and
• Experience developing services that handle high request or message volumes
• Good understanding of high availability load distribution scalability and caching
• Experience designing microservices and event-driven architectures
• Strong knowledge of asynchronous messaging systems and in-memory data structures
• Experience with relational data modelling and complex query optimisation
• Understanding of transactions concurrency locking and data consistency
• Practical experience with automated unit functional integration and load testing
• Knowledge of containers continuous deployment pipelines and monitoring tools
• Ability to investigate performance and production issues across multiple technical layers
• A Masters degree or equivalent technical background

A European digital entertainment company operating high-volume online platforms across several markets.

The organisation employs approximately 500 people and serves hundreds of thousands of active users. Its proprietary transactional platform supports real-time activity personalised user experiences and fraud prevention while maintaining strict availability and data protection requirements.

Health insurance profit-sharing and an employee incentive scheme.

Languages: Native or bilingual French and professional English.

A search run by The French Sourcer recruitment built for technical teams.