Senior Software Engineer, C++ (Mobile Core)

Telnyx54

Dublin, Ireland; Amsterdam, Netherlands; Poland; Slovakia; Turkey; United Kingdom; Spain; EMEA Remote permanent

Posted: April 1, 2026

Required Skills

Job Description

About Telnyx

Telnyx is an industry leader that's not just imagining the future of global connectivity—we're building it. From architecting and amplifying the reach of a private, global, multi-cloud IP network, to bringing hyperlocal edge technology right to your fingertips through intuitive APIs, we're shaping a new era of seamless interconnection between people, devices, and applications.

We're driven by a desire to transform and modernize what's antiquated, automate the manual, and solve real-world problems through innovative connectivity solutions. As a testament to our success, we're proud to stand as a financially stable and profitable company. Our robust profitability allows us not only to invest in pioneering technologies but also to foster an environment of continuous learning and growth for our team.

Our collective vision is a world where borderless connectivity fuels limitless innovation. By joining us, you can be part of laying the foundations for this interconnected future. We're currently seeking passionate individuals who are excited about the opportunity to contribute to an industry-shaping company while growing their own skills and careers.

About the Role

We're looking for a Senior Software Engineer to join our Core Wireless team, responsible for the design, development, deployment and maintenance of all mobile network infrastructure and associated applications. You'll work at the intersection of software engineering and mobile telecoms, with a particular focus on IoT.

What You'll Do

• Design, build and maintain APIs, services, and systems across Telnyx's Wireless stack

• Debug production issues across services and multiple levels of the stack

• Troubleshoot connectivity issues across roaming partners globally

• Collaborate with engineers across the company to build new features

• Improve engineering standards, tooling, and processes

What We're Looking For

• Strong experience in one or more of: Go, Elixir, or Erlang; C++ in a telecoms context is a plus

• Familiarity with 3GPP specifications and mobile core protocols (e.g. AMF, UPF, SMF or equivalent 4G/5G elements)

• Experience with IoT platforms and mobile network systems and protocols

• Understanding of relational databases and SQL

• Practical skills in automated testing and a passion for robustness

• Strong sense of ownership, innate curiosity, and willingness to learn

Bonus Points

• Experience with IoT/M2M solution design and implementation

• Familiarity with multi-vendor IPX connectivity

• Message queues: RabbitMQ or Kafka

• PostgreSQL or exotic databases/key-value stores (e.g. ETS)

• Docker, Kubernetes, Consul, Jenkins, Prometheus

• Basics of web front-end

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