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About Telnyx Technology right to your fingertips through intuitive APIs, we are shaping a new era of seamless interconnection between people, devices, and applications.
We transform and modernize what's antiquated, automate the manual, and solve real‑world problems through innovative connectivity solutions.
As a financially stable and profitable company, we invest in pioneering technologies and foster continuous learning and growth for our team.
Our vision is a world where borderless connectivity fuels limitless innovation.
About The Role
We are looking for a Senior Elixir Engineer to join our Real‑Time Communications (RTC) team.
You will design, build, scale, and maintain distributed telecom systems used for SIP signaling, call routing, media processing, and real‑time voice services.
You will work primarily in Elixir/OTP, contributing to systems that must be extremely reliable, latency‑optimized, and globally distributed.
This high‑impact role owns major components of our RTC platform.
What You'll Do
Design, develop, and maintain Elixir/OTP services for SIP signaling, call routing, and real‑time media flows.
Build fault‑tolerant distributed systems requiring extreme reliability (five‑nines availability).
Work with telecom protocols (SIP, RTP, Web RTC, STIR/SHAKEN) and event‑driven architectures.
Optimize performance and reduce latency across global edge locations.
Participate in on‑call rotations and incident response for real‑time systems.
Debug complex distributed issues involving networking, signaling flows, and concurrency.
Collaborate with Infrastructure, Data, and Network Engineering teams to evolve system architecture.
Improve observability and monitoring for Elixir‑based telecom services.
Mentor junior engineers and set engineering excellence across the team.
What You'll Bring (Must‑Haves)
4+ years professional experience building production systems in Elixir/OTP.
Deep understanding of concurrency, processes, supervisors, and Gen Servers.
Experience building distributed, high‑availability systems.
Strong understanding of networking fundamentals (TCP/UDP, NAT traversal, DNS).
Hands‑on experience with SIP, RTP, or real‑time communications protocols.
Strong debugging skills in distributed or real‑time environments.
Experience with Postgres, Redis, Kafka, or similar technologies.
Ability to write clean, maintainable, well‑tested code.
Comfortable participating in on‑call rotations for high‑availability systems.
Nice‑to‑Haves
Experience with Free SWITCH, Asterisk, or similar softswitch technologies.
Experience with Web RTC, media servers, or STT/TTS pipelines.
Knowledge of BEAM performance tuning.
Experience with Kubernetes, infrastructure‑as‑code, and observability stacks.
Telecom background (carrier networks, SBCs, ENUM, signaling gateways).
Previous work in high‑growth or high‑scale distributed environments.
Contributions to open‑source Elixir or BEAM projects.
Success in This Role Looks Like
After 6–12 months, you will have:
Owned and delivered major Elixir/OTP systems into production.
Improved reliability, latency, and scalability of RTC components.
Led incident response and implemented lasting improvements.
Become a subject‑matter expert in real‑time telecom flows.
Collaborated across teams to evolve the RTC architecture.
Demonstrated strong ownership and accountability for core services.
Why You'll Love Working Here
Work on real‑time systems used globally and at extreme scale.
Join a deeply technical, engineering‑driven culture.
Learn from experts in Elixir, distributed systems, and telecom.
Have autonomy and ownership over critical platform components.
Telnyx is an equal‑opportunity employer committed to diversity and inclusion.
We welcome applicants from all backgrounds and do not discriminate based on protected characteristics.
Seniority level: Mid‑Senior level
Employment type: Full‑time
Job function: Engineering and Information Technology
Industry: Software Development
Location: Dublin, County Dublin, Ireland
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