Senior Erlang Developer

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. You’ll 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

• 6+ 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).
• Contributions to open-source Erlang projects or messaging libraries.