Senior Erlang Developer

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. 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.