Senior Erlang Developer

4 weeks ago


Gurugram, India Hawk MarTech Full time

Role OverviewAs 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 ResponsibilitiesDesign, 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 Qualifications6+ 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-HaveExperience 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.



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