Telnyx

TEST: Senior Elixir Engineer

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Technical Implementation Engineer

Telnyx is seeking a Senior Elixir Engineer for its Real-Time Communications (RTC) team. This role involves designing, building, scaling, and maintaining distributed telecom systems for SIP signaling, call routing, media processing, and real-time voice services. The engineer will work primarily with Elixir/OTP to deliver highly reliable, latency-optimized, and globally distributed fault-tolerant systems, collaborating with various engineering teams and owning major components of the RTC platform.

NOC Graduate Programme (Mexico)

About TelnyxTelnyx 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 <a href="https://telnyx.com/our-network" target="blank" rel="noopener noreferrer" class="text-blue-600 hover:text-blue-800 hover:underline transition-colors duration-200">private, global, multi-cloud IP network</a>, to bringing <a href="https://telnyx.com/resources/about-edge-connectivity" target="blank" rel="noopener noreferrer" class="text-blue-600 hover:text-blue-800 hover:underline transition-colors duration-200">hyperlocal edge</a> 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 TelnyxTelnyx is a global connectivity platform enabling voice, messaging, wireless, and networking products for customers who build real-time applications. Our infrastructure spans the globe and supports mission-critical communication workloads for enterprises, platforms, and applications.We are engineering-led, customer-obsessed, profitable, and growing fast. You’ll join a high-impact team building distributed systems used by thousands of developers.---About the RoleWe 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’ll work primarily in Elixir/OTP, contributing to systems that must be extremely reliable, latency-optimized, and globally distributed. You’ll collaborate with engineers across infrastructure, networking, and platform teams to deliver fault-tolerant systems that operate at massive scale.This is a high-impact role where you’ll own major components of our RTC platform.---What You’ll Do<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Design, develop, and maintain Elixir/OTP services for SIP signaling, call routing, and real-time media flows.</li><li class="leading-relaxed">Build fault-tolerant distributed systems that require extreme reliability (five-nines availability).</li><li class="leading-relaxed">Work with telecom protocols (SIP, RTP, WebRTC, STIR/SHAKEN) and event-driven architectures.</li><li class="leading-relaxed">Optimize performance and reduce latency across global edge locations.</li><li class="leading-relaxed">Participate in on-call rotations and incident response for real-time systems.</li><li class="leading-relaxed">Debug complex distributed issues involving networking, signaling flows, and concurrency.</li><li class="leading-relaxed">Collaborate with Infrastructure, Data, and Network Engineering teams to evolve system architecture.</li><li class="leading-relaxed">Improve observability and monitoring for Elixir-based telecom services.</li><li class="leading-relaxed">Mentor junior engineers and set engineering excellence across the team.</li></ul>---What You’ll Bring (Must-Haves)<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">4+ years professional experience building production systems in Elixir/OTP</li><li class="leading-relaxed">Deep understanding of concurrency, processes, supervisors, and GenServers</li><li class="leading-relaxed">Experience building distributed, high-availability systems</li><li class="leading-relaxed">Strong understanding of networking fundamentals (TCP/UDP, NAT traversal, DNS)</li><li class="leading-relaxed">Hands-on experience with SIP, RTP, or real-time communications protocols</li><li class="leading-relaxed">Strong debugging skills in distributed or real-time environments</li><li class="leading-relaxed">Experience with Postgres, Redis, Kafka, or similar technologies</li><li class="leading-relaxed">Ability to write clean, maintainable, well-tested code</li><li class="leading-relaxed">Comfortable participating in on-call rotations for high-availability systems</li></ul>---Nice-to-Haves<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Experience with FreeSWITCH, Asterisk, or similar softswitch technologies</li><li class="leading-relaxed">Experience with WebRTC, media servers, or STT/TTS pipelines</li><li class="leading-relaxed">Knowledge of BEAM performance tuning</li><li class="leading-relaxed">Experience with Kubernetes, infrastructure-as-code, and observability stacks</li><li class="leading-relaxed">Telecom background (carrier networks, SBCs, ENUM, signaling gateways)</li><li class="leading-relaxed">Previous work in high-growth or high-scale distributed environments</li><li class="leading-relaxed">Contributions to open-source Elixir or BEAM projects</li></ul>---Success in This Role Looks LikeAfter 6–12 months, you will have:<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Owned and delivered major Elixir/OTP systems into production</li><li class="leading-relaxed">Improved reliability, latency, and scalability of RTC components</li><li class="leading-relaxed">Led incident response and implemented lasting improvements</li><li class="leading-relaxed">Become a subject-matter expert in real-time telecom flows</li><li class="leading-relaxed">Collaborated across teams to evolve the RTC architecture</li><li class="leading-relaxed">Demonstrated strong ownership and accountability for core services</li></ul>---Why You’ll Love Working Here<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Work on real-time systems used globally and at extreme scale</li><li class="leading-relaxed">Join a deeply technical, engineering-driven culture</li><li class="leading-relaxed">Learn from experts in Elixir, distributed systems, and telecom</li><li class="leading-relaxed">Have autonomy and ownership over critical platform components</li></ul>

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As a quality manager, you are responsible for monitoring and ensuring the quality of three essential product groups within our construction activities: recycled aggregates, hydraulically bound mixtures, and road concrete. You contribute to the sustainability, reliability, and conformity of our products, working from our sites in Burcht and Bilzen. This involves overseeing technical standards, conducting analyses, managing production processes, and maintaining quality documentation.

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<h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">Company Description</h2>BESIX Infra is the knowledge-driven contractor for road construction in the Flemish and Brussels market, active in road construction, sewer construction, environmental remediation, and the construction of public spaces.BESIX Infra is among the top 3 players in the Belgian infrastructure market, for both public and private clients.The branches in Bilzen and Burcht have their own concrete and recycling site. In addition, the 100% subsidiary Belasco in Bilzen, Ghent, and Puurs has its own asphalt production facilities. All this to efficiently carry out work in Flanders and Brussels.BESIX Infra positions itself, in addition to being market-compliant, more and more as a true partner in terms of communication, neighborhood consultation, and reducing nuisance.<h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">Job Description</h2>As a quality manager, you are responsible for monitoring and ensuring the quality of three essential product groups within our construction activities: recycled aggregates, hydraulically bound mixtures, and road concrete. You contribute to the sustainability, reliability, and conformity of our products, and work from our sites in Burcht and Bilzen.1. Recycled aggregates<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">You monitor the quality of aggregates resulting from the crushing of old concrete, asphalt, or other building materials.</li><li class="leading-relaxed">You check whether these comply with technical standards (such as BENOR) and environmental legislation (such as VLAREMA).</li><li class="leading-relaxed">You perform analyses on grain size distribution, contaminants, and origin.</li><li class="leading-relaxed">You ensure correct documentation and traceability.</li></ul>2. Hydraulically bound mixtures (HBM)<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">You draw up technical mix formulas for mixtures of aggregates with cement or other binders.</li><li class="leading-relaxed">You monitor the production process and control parameters such as workability, hardening, and strength.</li><li class="leading-relaxed">You ensure that the end product meets the requirements for foundation material in road construction.</li></ul>3. Road concrete<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">You monitor the quality of concrete used for roads and industrial sites.</li><li class="leading-relaxed">You check composition, hardening time, compressive strength, and surface finish.</li><li class="leading-relaxed">You guide external audits and certification processes (e.g., COPRO).</li></ul>4. Drawing up recipes in accordance with regulations<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">You draw up technical mix formulas, tailored to the project requirements and applicable standards.</li><li class="leading-relaxed">You take into account parameters such as grain size distribution, binder types, moisture content, and workability.</li><li class="leading-relaxed">You collaborate with production and the laboratory to test, refine, and validate recipes.</li></ul>5. Self-control of production, the production process, and product delivery<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">You carry out systematic controls on the quality of the produced materials.</li><li class="leading-relaxed">You check whether production proceeds according to established procedures and whether the end products comply with technical specifications.</li><li class="leading-relaxed">You also monitor the quality of delivery: correct packaging, transport conditions, and traceability. Attending and guiding external controls by certification bodies</li><li class="leading-relaxed">You prepare for audits and inspections by certification bodies such as COPRO.</li><li class="leading-relaxed">You are present during these controls and act as a point of contact for the auditors.</li><li class="leading-relaxed">You ensure follow-up of any comments or action points and implement improvement measures.</li></ul>6. Drawing up and managing the quality manual<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">You develop and maintain the quality manual in which all procedures, standards, controls, and responsibilities are laid down.</li><li class="leading-relaxed">You ensure that the manual is always up-to-date and in accordance with the latest legislation and standards.</li><li class="leading-relaxed">You communicate changes to the relevant departments and ensure correct implementation.</li></ul><h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">Job Requirements</h2>Education:Bachelor or master in a technical field (civil engineering, chemistry, environmental technology, industrial sciences).Experience:<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">At least 3 years relevant experience in quality management within the construction sector or material production.</li><li class="leading-relaxed">Experience with standards such as BENOR, CE marking, COPRO, and VLAREMA is a plus.</li></ul>Skills:<ul class="list-disc list-inside my-5 pl-5 space-y-2 text-gray-700"><li class="leading-relaxed">Analytical and precise mindset.</li><li class="leading-relaxed">Strong communication skills.</li><li class="leading-relaxed">Ability to work independently and collaborate smoothly with production, logistics, and external partners.</li></ul><h2 class="text-2xl md:text-3xl font-bold mt-10 mb-4 border-b pb-2 text-gray-800">Additional Information</h2>We offer you a salary supplemented with extra legal benefits within a dynamic and pleasant working environment.

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