Role Overview :

As a Senior Erlang Developer, you will be responsible for developing and optimizing backend components that power real-time chat, presence, group messaging, push notifications, and end-to-end encryption. Youll work on scalable systems capable of handling millions of concurrent users and billions of messages daily.

Key Responsibilities :

- Design, build, and maintain real-time, low-latency messaging services using Erlang/OTP.

- Implement and optimize protocols such as XMPP, MQTT, or custom lightweight messaging protocols.

- Build fault-tolerant, distributed backend services capable of scaling horizontally.

- Develop presence systems, user state management, chat history storage, and message delivery tracking.

- Work closely with mobile and frontend teams to integrate APIs and messaging features.

- Contribute to the architecture of end-to-end encryption, message queues, and storage strategies.

- Monitor system performance and implement improvements to reduce latency and resource usage.

- Ensure high availability and zero-downtime deployments with rolling updates and clustering strategies.

- Collaborate in code reviews, architectural discussions, and feature planning sessions.

Must-Have Qualifications :

- 5+ years of production experience with Erlang/OTP, ideally in real-time systems.

- Solid understanding of distributed systems, event-driven architecture, and concurrent programming.

- Experience working with messaging protocols (e.g., XMPP, MQTT, WebSockets).

- Familiarity with Mnesia, Riak, or similar distributed databases.

- Proficiency in building and scaling systems that handle millions of concurrent users.

- Knowledge of fault tolerance, hot code swapping, and system uptime strategies.

- Strong understanding of networking, sockets, and asynchronous I/O.

- Experience with monitoring tools (e.g., Grafana, Prometheus) and log aggregation.

Nice-to-Have :

- Experience with push notification systems (APNs, FCM, etc.).

- Exposure to end-to-end encryption, cryptographic protocols, and secure messaging architectures.

- Familiarity with Elixir or willingness to work in an Erlang/Elixir hybrid environment.

- Understanding of containerized deployments (Docker, Kubernetes).