Senior Software Engineer – Elixir Mobile Core

About the role

Telnyx is seeking a Senior Software Engineer to join its Core Wireless team. You will work at the intersection of software engineering and mobile telecommunications, focusing on the design, development, and operation of mobile network infrastructure and IoT solutions.

Key responsibilities

• Design, build, and maintain APIs, services, and systems across Telnyx's wireless stack.
• Debug production issues across services and multiple layers of the stack.
• Troubleshoot connectivity problems with roaming partners worldwide.
• Collaborate with engineers across the company to deliver new features.
• Improve engineering standards, tooling, and processes.

Required profile

• Strong experience with Go, Elixir, or Erlang (C++ in a telecom context is a plus).
• Familiarity with 3GPP specifications and mobile core protocols such as AMF, UPF, SMF.
• Experience with IoT platforms and mobile network systems.
• Understanding of relational databases and SQL.
• Practical skills in automated testing and a passion for robustness.
• Strong sense of ownership, curiosity, and willingness to learn.

Required skills

• Go
• Elixir
• Erlang
• C++ (telecom context)
• 3GPP specifications
• Mobile core protocols (AMF, UPF, SMF)
• IoT platforms
• Relational databases
• SQL
• Automated testing
• RabbitMQ
• Kafka
• PostgreSQL
• ETS (Erlang Term Storage)
• Docker
• Kubernetes
• Consul
• Jenkins
• Prometheus
• Basic web front‑end knowledge