Backend Developer

**About Oh BiBi**

Oh BiBi is an independent mobile game studio of 80 people based in Paris, dedicated to creating bold, innovative, and high-quality gaming experiences. We are the creators of FRAG Pro Shooter, a worldwide hit with hundreds of millions of players, and BEAST, which won the Pégase Award for Best Mobile Game in 2025 (the Pégases are France’s prestigious video game awards, recognizing excellence in game development).

We are currently working on exciting unannounced projects

**About the Role**

Oh BiBi is looking for a **Back-end Developer** who will design, build, and maintain backend systems for large-scale mobile games supporting tens of thousands of concurrent players.

The role bridges game logic and scalable cloud backend, ensuring high performance, low latency, and reliable multiplayer experiences.

**About the Team**

You will join a small team of four people who share knowledge and understanding, and collaborate on designs and technical choices with an open mindset.

Our main responsibility is to develop and maintain reusable, modular game services that enable millions of players to enjoy an online experience.

**About the Tech**

A recent set of solid bricks has been redesigned, stabilized, and reused in all new games.

**Core Responsibilities**:

- **Design and develop backend services** and **APIs** powering game features (sessions, matchmaking, economy, leaderboards, etc.).
- Collaborate with **gameplay** and **client teams** to define **communication protocols** (WebSocket, REST).
- Optimize **server performance and resource utilization**, identifying bottlenecks and implementing** scalable solutions**.
- Manage state synchronization and concurrency across **distributed systems**.
- Implement player data persistence, session management, and failover strategies.
- Participate in **code reviews, technical documentation**, and maintain **high-quality coding standards**.
- Contribute to **observability**, including logging, profiling, and metrics.
- Support CI/CD processes and **automated testing pipelines** (in collaboration with DevOps).
- Perform load and stress testing to ensure** stability at scale**.
- **Stay updated** on new backend architectures and tools relevant to multiplayer systems.

**What are we looking for?**:
**Programming & Architecture**:

- Strong coding skills in Golang or C# or equivalent programming language.
- Solid understanding of concurrency, synchronization, and event-driven programming.
- Knowledge of network protocols: HTTP, WebSocket
- Experience designing distributed architectures and microservices.

**Data & Performance**:

- Mastery of NoSQL databases Redis and MongoDB and good understanding of SQL fundamentals.
- Experience in profiling, optimization, and debugging under high load.
- Understanding of replication, latency, and eventual consistency.

**Tooling & Infrastructure**:

- Familiarity with Docker, Kubernetes, and CI/CD pipelines (GitHub Actions), along with experience using cloud platforms like AWS, Azure, or Google Cloud.
- Awareness of DevOps principles (though not responsible for infra setup).
- Understanding of security and data protection in online environments.

**Game-Specific Knowledge**:

- Understanding of multiplayer logic, matchmaking, and ranking systems.
- Knowledge of networked gameplay architecture (client-server, authoritative server).
- Awareness of bandwidth constraints and network optimization for mobile.

**Soft Skills**:

- Analytical and structured thinking, capable of understanding complex systems.
- Strong sense of ownership and accountability.
- Cross-team collaboration and communication clarity.
- Curiosity for game mechanics and technical innovation.
- Rigor and precision, with an eye for code quality and performance.

**Education & Experience**:

- Master’s degree or Engineering School diploma (Master’s / MSc / Engineering degree) in Computer Science or a related field.
- Previous experience in online or multiplayer game development is a major asset.
- Proficiency in English (written) is required for documentation and cross-team collaboration.

**On-site Presence**:

- Collaboration matters to us We meet in the Paris office twice a week (Tuesdays and Thursdays)