T

Telnyx

Cloud-based voice, messaging, and wireless services

Forward Deployed Engineer

Full-Time
No salary listed
Mid
Bachelor's
Seoul, South Korea
HybridHybrid role with travel across South Korea and the broader Southeast Asia region.
Software EngineeringAI Application Engineering, Backend Engineering

About the job

Requirements
  • A Computer Science degree or equivalent experience is required.
  • At least 3 years of experience building and shipping production software, including coding used by real users, on-call work, and debugging production issues, is required.
  • Proficiency in multiple programming languages among Python, Node.js/TypeScript, and Go is required; TypeScript is used for Telnyx Edge Compute functions and stateful actors.
  • Practical understanding of production model failure modes, including provider rate limits and quotas, timeout and retry behavior, streaming, token accounting and cost attribution, and concurrency-related failures, is required.
  • Experience deploying containerized services on Kubernetes, including secrets management, configuration, and upgrades, is required.
  • Experience instrumenting observability using Prometheus, Grafana, OpenTelemetry, Graylog, ELK, or equivalent tools is required, including knowing what to monitor and alert on and how to assess system health.
  • High-concurrency experience with Kafka, message queues, or event streams at scale is required, including understanding consumer lag, backpressure, hot partitions, and rebalance stalls, and mitigation through partitioning, consumer groups, and parallelism.
  • Experience building APIs from scratch is required, including OpenAPI specifications, REST or GraphQL design, authentication, rate limiting, versioning, and idempotency.
  • Event-driven thinking and cloud-native instincts are required.
  • Exposure to SIP, WebRTC, or real-time voice or messaging systems is required.
  • The candidate must be self-sufficient, able to read code and documentation, ask customers for information, and make sound engineering decisions independently.
  • Customer-facing engineering experience is required, including conducting discovery with customer engineers and presenting to executives.
  • The candidate must be able to translate reported technical failures into root causes.
  • The candidate must be comfortable working at customer sites and participating in high-stakes technical conversations.
  • Excellent written and verbal communication in English and Korean is required, including the ability to lead whiteboard sessions, live troubleshooting, and escalations with customer engineering teams.
  • The candidate must be based in Seoul or willing to relocate.
  • The candidate must be legally authorized to work in South Korea or eligible for sponsorship.
Responsibilities
  • Embed with enterprise customers to understand their communications workflows, artificial intelligence use cases, and integration challenges.
  • Build and deploy custom implementations, including artificial intelligence voice assistants, Telnyx APIs for voice, messaging, fax, and wireless, and WebRTC solutions.
  • Run open-weight large language models in customer environments through Telnyx Inference using an OpenAI-compatible API, or deploy self-hosted model stacks such as Llama, Mistral, EEVE-Korean, Polyglot-KR, and other Korean-language sovereign models behind a serving engine when air-gapped or sovereign-cloud requirements demand it.
  • Deploy and operate LiteLLM as a model gateway in customer environments, providing a unified OpenAI-compatible interface across self-hosted open-weight models and hosted providers, with routing, load balancing, retries and fallbacks, rate limits, and per-team virtual keys.
  • Instrument and govern large language model usage through the gateway, including cost tracking and budgets, caching, logging and observability using OpenTelemetry, Langfuse, or similar tools, and guardrails.
  • Implement production observability for shipped systems, including metrics, logs, traces, dashboards, and alerting using tools such as Prometheus and Grafana, OpenTelemetry, Graylog, ELK, or the customer's existing stack.
  • Design model-routing strategies for real-time voice workloads that balance latency, cost, and quality and provide fallback behavior when a provider degrades.
  • Evaluate the build-versus-buy trade-offs between self-hosted open-weight models and hosted frontier APIs, while keeping customer application code portable across both.
  • Adapt models to customer domains by building prompt and retrieval-augmented generation pipelines and evaluation harnesses for Korean and English use cases and Korea/APAC regulatory environments, including PIPA, data localization, and PSC cloud security regulations.
  • Lead proofs of concept, pilots, and production launches from initial design through go-live.
  • Own customer outcomes and remain engaged until solutions are live and stable.
  • Collaborate directly with Product and Engineering to shape the roadmap using field insights from South Korea and the broader Southeast Asia region.
  • Create clear technical documentation and runbooks and maintain solutions suitable for handoff.
  • Troubleshoot and resolve complex integration issues alongside customer teams.
Desired Qualifications
  • Experience with artificial intelligence voice assistants, speech-to-text or text-to-speech, or large-language-model-based conversational systems is desirable.
  • Experience building evaluation sets for a specific domain is desirable.
  • Hands-on production experience with a large language model gateway such as LiteLLM, Portkey, Kong AI Gateway, or an in-house OpenAI-compatible proxy is desirable, including configuration-driven model definitions, routing and fallback rules, and virtual key management.
  • Familiarity with open-weight models and trade-offs between regional and multilingual models, including Korean-language models such as EEVE-Korean, Polyglot-KR, and Kanana, and Korean sovereign artificial intelligence initiatives from Naver, KT, and SK Telecom AI, is desirable.
  • Production experience with inference serving engines such as vLLM, SGLang, or TGI, or Ollama for lightweight on-premises deployment, and experience sizing GPU capacity based on key-value cache footprint, concurrent batch size, context length, and video random-access memory, is desirable.
  • SQL proficiency, including Postgres, MySQL, or Oracle, is desirable.
  • Experience with extract, transform, and load processes and data wrangling is desirable.
  • Experience designing and automating continuous integration and continuous delivery pipelines is desirable.
  • A background in telecommunications, CPaaS, or high-growth software as a service is desirable.
  • Experience with sovereign or on-premises cloud deployments and Korean/APAC regulatory frameworks is desirable, including PIPA, PSC cloud security guidelines, Korea data localization under the Location-Based Information Act, FSC cloud guidelines for financial services, and APAC cross-border data transfer frameworks.
  • A security mindset, including familiarity with identity and access management, encryption, and audit logging, is desirable.

About the company

Telnyx provides cloud-based communication services for businesses, including voice, messaging, wireless, and fax, accessed through its Mission Control Portal. It operates on a pay-as-you-go model where customers are billed for usage such as calls, texts, and data. The company differentiates itself by owning and operating a global IP network, which improves performance, reliability, and security, along with extensive support resources for customers. Its goal is to enable businesses of all sizes to communicate reliably and securely over the internet through scalable, usage-based services.

Company Size

201-500

Company Stage

Seed

Total Funding

$1M

Headquarters

Austin, Texas

Founded

2009

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Simplify Jobs

Simplify's Take

What believers are saying

  • September 30, 2026 GPT-Live and Voice AI updates strengthen Telnyx's agent platform.
  • August 2026 Email API, Edge Compute, and AgentSDK deepen platform lock-in.
  • July 15, 2026 Dubai GPUs and late-September India anchorsites open regulated expansion paths.

What critics are saying

  • FCC still seeks a $4.49 million forfeiture over alleged robocalls; proceedings remain pending.
  • RCS agent registration still depends on carrier launch approval, slowing revenue realization.
  • Carrier compliance tightening or deplatforming after spam complaints would cripple messaging and voice growth.

What makes Telnyx unique

  • Telnyx owns its carrier network and 18 global points of presence, not rented infrastructure.
  • September 2026 releases unified voice, email, WhatsApp, and RCS under one API.
  • Dubai sovereign GPUs keep inference and customer data in-region for regulated buyers.

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Benefits

  • Health Insurance
  • 401(k) Company Match
  • 401(k) Retirement Plan
  • Unlimited Paid Time Off
  • Share Options

Growth & Insights and Company News

Headcount

6 month growth

0%

1 year growth

-1%

2 year growth

-1%
News4Hackers
Aug 27th, 2026
Australia arrests alleged TeamPCP hackers in supply-chain attack case.

Australia arrests alleged TeamPCP hackers in supply-chain attack case. Post Views: 7 Australia authorities have detained two individuals suspected of involvement in the TeamPCP cybercriminal network, which orchestrated widespread supply-chain attacks targeting software development ecosystems. Arrest of suspects in TeamPCP network. Australia authorities have detained two individuals suspected of involvement in the TeamPCP cybercriminal network, which orchestrated widespread supply-chain attacks targeting software development ecosystems. The suspects, aged 21 and 23, were apprehended in Western Australia on August 26, 2026, following an investigation into malicious activities that compromised open-source software repositories and developer infrastructure. Impact of TeamPCP attacks. TeamPCP has been linked to multiple high-profile breaches affecting projects such as Trivy, LiteLLM, Telnyx, SAP, and TanStack, as well as infiltrations of the European Commission, Mistral AI, OpenAI, and GitHub. The group's operations involved inserting malicious code into open-source projects hosted on public repositories, which developers subsequently integrated into their applications. This method enabled the exfiltration of authentication credentials, source code, and sensitive data from systems used by government agencies, academic institutions, and private enterprises. According to the Australian Federal Police (AFP) and FBI, the malicious code distributed by TeamPCP impacted over 1,000 organizations globally, resulting in the theft of 500,000 credentials and the unauthorized transfer of at least 300GB of data. Investigation and evidence collection. The investigation commenced in April 2026 after cybersecurity firms provided critical intelligence to law enforcement. During the operation, authorities seized electronic devices and digital evidence for forensic analysis. The suspects are alleged to have received cryptocurrency payments for their roles in the attacks. Independent analyses by Flare and Brian Krebs highlighted connections between Telegram activity, reused usernames, and other digital footprints that helped identify the individuals. Charges and legal consequences. The two detainees face 14 combined charges related to unauthorized data access, data modification, and facilitating criminal activities. The younger suspect also faces allegations of handling $100,000 in illicit funds and failing to comply with data access requirements. Each charge carries potential sentences of 3 to 20 years in prison. The AFP stated that additional arrests or charges remain possible as investigators review seized materials. Implications for software supply chain security. The case underscores the vulnerabilities in software supply chains, with research indicating that 37% of attacker activities go undetected even after gaining valid credentials. The incident has prompted renewed scrutiny of open-source security practices and the need for enhanced monitoring of developer platforms.

iBluSend
Aug 26th, 2026
RCS agent registration API: why agencies should wait.

RCS agent registration API: why agencies should wait. Telnyx turned RCS agent registration into two API calls. The stage that decides whether your messages land is still a human queue. What agencies should do. Zach Brick · Founder & CEO, iBluSend · August 26, 2026 Telnyx shipped the easy half of RCS. Two API calls now stand between an agency and a registered RCS brand. The stage that decides whether a single message reaches a human is still a queue with telco employees sitting in it. Telnyx published its RCS agent registration API release note, and the shape is clean: register the brand, register the agent, move through a two-stage flow from brand verification to carrier launch, with status tracking across the whole thing. Work that used to live in a spreadsheet and an email thread now fires from your onboarding script. That is genuinely good engineering, and I'd rather have it than not. But the most revealing line in that release note isn't the registration call at all. It's the status tracking, and what it quietly concedes about stage two. iBluSend'll get to that, because it's the part that should change your Q4 plan. What did the RCS agent registration API actually automate? The submission, not the approval. Brand verification and agent creation become API calls with a status you can poll. Carrier launch approval stays exactly where it always sat: with mobile network operators reviewing your agent on their own timeline. Telnyx automated the form. Nobody automated the reviewer. That distinction matters more than it sounds. Every RCS pitch of the last two years has treated registration friction as the reason adoption stalled, as if the only thing standing between agencies and rich branded messaging was a tedious intake process. Remove the intake process and you find out whether that was true. Spoiler from the release note itself: it advertises a flow that runs "through carrier launch," which is a polite way of saying the flow does not end when you get a 200 back. It ends when someone at a carrier says yes. Why is everyone reading this as "RCS is finally easy"? Because the visible friction disappeared, and visible friction is what people measure. An agency owner who spent three weeks last year assembling brand documents reads "two API calls" and feels the relief in their spine. That reaction is honest. It's also measuring the wrong thing. The industry has a habit here. Every time a channel's paperwork gets automated, the trade press declares the channel unlocked, and then everyone rediscovers that paperwork was never the bottleneck. 10DLC went through this exact arc: providers built slick registration wizards, agencies registered in an afternoon, and then spent the following year discovering that carrier filtering, throughput tiers and campaign vetting were the real gates. The wizard was lovely. The messages still got filtered. RCS is running the same play. Registration got fast. Delivery approval didn't move. What happens during carrier launch approval? Your verified agent has to be launched by each carrier that will carry its traffic, and carriers make that decision individually, on their own review cadence, with their own criteria. Until that happens, your beautifully registered agent sends to nobody on that network. Which brings iBluSend back to the status tracking, the detail I told you to hold onto. Think about what a status endpoint is for. You expose one when the underlying process is slow enough and opaque enough that the caller needs a way to check on it. Nobody builds status polling for something that returns instantly. The presence of that endpoint is Telnyx being straight with you: the second stage takes long enough that you'll want to watch it. So the honest read of this release is that RCS registration became an API, and RCS launch became an API-shaped waiting room. You've traded a slow form for a fast form plus a refresh button. That's an improvement in developer experience. It is not an improvement in time-to-first-reply. Who actually wins when RCS registration becomes an API call? Here's the flip. Everyone is covering this as a win for agencies. Ask who else gets the same API, and it reads very differently. Your competitor's agency gets it. So does the one down the street with worse copy and a bigger list. Registration was never a moat, but it was at least a filter: a process annoying enough that plenty of shops never finished it. Remove the annoyance and the filter goes with it. A capability every competitor can acquire in a sprint is not an advantage, it's a baseline, and baselines cost money to maintain while returning nothing in differentiation. There's a second-order effect worth pricing in too. When registration is cheap, agent volume goes up, and when agent volume goes up, carriers get stricter about what they launch and what they filter, because that's the only lever they have left. Easy registration tends to produce harder delivery over time. The channel gets more crowded before it gets more effective, and the agencies who planned their quarter around a launch date they don't control absorb that timing risk personally. Where does that leave iMessage and GoHighLevel outreach? Exactly where it was, which is the point. The differentiator moves back to the lane nobody can request access to through an API: the blue bubble on an iPhone, sent from a real Mac, with read receipts and typing indicators the recipient already trusts because their friends produce the same artifacts. | Gate between you and a reply | Branded RCS agent | iMessage via iBluSend | | Brand and agent registration | Required | None | | Carrier launch approval | Required, carrier by carrier | None | | 10DLC / A2P registration | Still applies to your SMS fallback | Not applicable | | Per-message carrier fee | Priced per message by your provider | $0 per message on your own line | | Native to GoHighLevel | Depends on the provider integration | Yes, real iMessage from a Mac bridge | None of that makes RCS bad. It makes RCS a channel with a gatekeeper, and iMessage a channel without one. If your outreach lives inside GHL and your prospects carry iPhones, one of those two starts producing replies the week you turn it on. What should your agency do about RCS this quarter? * Register anyway. It's two API calls now. Spending a day on something that used to take three weeks is obviously correct, and being unregistered when the queue clears would be silly. * Budget it as parity, not upside. Put RCS in the same mental column as having a website. You need one. It wins you nothing. * Do not promise a client an RCS launch date. You don't own stage two. Quote what you control. * Split your iPhone traffic out now. Pull your list, count how much of it is on Apple hardware, and route that segment to the channel that already delivers today rather than the one pending review. * Re-check in ninety days. If your agent has cleared carrier launch and reply rates justify it, scale. If it hasn't, you lost a day, not a quarter. By the time your agent clears carrier launch, so will everyone else's. The only question worth answering before then is what you'll have that they won't. Frequently asked questions. industry-news GoHighLevel iMessage marketing SMS compliance Zach Brick. Founder & CEO Zach Brick is the founder and CEO of iBluSend, the leading iMessage bridge platform for GoHighLevel and CRM automation. With deep expertise in messaging technology and marketing automation, Zach helps agencies and businesses achieve 98% open rates through iMessage marketing. Serial entrepreneur with 10+ years in marketing technology iMessage Marketing GoHighLevel Integration CRM Automation Marketing Technology Agency Growth

IT Business Net
Aug 5th, 2026
Telnyx launches Email API, completing its multi-channel platform for real-time agents.

Telnyx launches Email API, completing its multi-channel platform for real-time agents. CHICAGO, Aug. 05, 2026 (GLOBE NEWSWIRE) - Telnyx, the infrastructure platform for real-time agents, today announced the launch of its Email API, enabling businesses to send transactional and marketing email through the same REST API they already use for SMS, voice, and WhatsApp. With this launch, Telnyx becomes a single-provider solution for every major communications channel and gives agentic applications a single foundation to build on. Email & Messaging The launch of the Telnyx Email API allows customers running agentic messaging and programmable voice workloads on Telnyx to consolidate all customer communications to one platform. Developers can POST to a single endpoint to send receipts, password resets, OTPs, alerts, and marketing content, with templates, batch sends, scheduled sends, and file attachments. Real-time webhooks and an event polling API provide visibility into every event from queued to opened. An AI agent can see that its email went unread and follow up with a call. A voice agent can send a receipt after a conversation ends, then check whether it was opened. Teams can build escalation logic, email first, SMS if it is time-sensitive, a call if it is still unresolved, as routing inside one API instead of glue code across three vendors. That loop only closes when one provider owns every channel. "Every SaaS app sends transactional email, and most teams manage it through a separate vendor with a separate API key, a separate invoice, and a separate dashboard. We built Email API to put email on the same platform as everything else. One API key, one bill, one vendor. Email was the last channel that required a second provider. Not anymore." - David Casem, CEO, Telnyx With every communications channel now on one platform, Telnyx gives developers and AI agent builders a single foundation for voice, messaging, and email, alongside its Voice AI platform and edge compute infrastructure. Voice AI agents on Telnyx can carry conversations across PSTN, WebRTC, and WhatsApp, and now trigger transactional emails from the same API key, on the same bill, through the same dashboard. Connect any channel to any LLM and build agents that talk, text, and email from one platform. The Telnyx portfolio also includes text-to-speech and speech-to-text, so teams can build full conversational AI pipelines alongside their email and messaging workflows. An agent that handles a support call, sends a receipt, and follows up with a password reset - all from the same platform, all triggered by the same workflow. Discover more Email & Messaging AI Tools, Chatbots & Virtual Assistants The Email API is available today in beta for all Telnyx customers. Customers can bring their own sending domain with API-based verification, or use a shared domain for self-serve. About Telnyx Telnyx is real-time AI infrastructure, edge compute, voice AI platform, and global communications in one system. Telnyx owns its carrier network, offers local numbers in 130+ countries, and operates 18 global points of presence with colocated GPU infrastructure for edge inference. This single operational domain delivers sub-200ms round-trip time, A-level STIR/SHAKEN authentication, and enterprise compliance including HIPAA, PCI, SOC 2, and GDPR. Headquartered in Austin with offices worldwide. www.telnyx.com Machine Learning & Artificial Intelligence

Associated Press
Aug 3rd, 2026
Telnyx launches Edge Compute to run entire real-time voice AI agents on single infrastructure

Telnyx has launched Edge Compute, an agent runtime enabling entire real-time voice AI agents to operate on its owned infrastructure. The platform allows agents' code to run on the same infrastructure hosting models, speech processing, and calls, eliminating network hops across the pipeline. Edge Compute includes Functions for containerised code, StatefulActor for per-entity state management, and KV, CloudFS, and Cloud Storage for handling state, files, and objects. Components connect through bindings, removing the need for credentials or network calls between elements. Telnyx already runs open-source LLMs on owned GPUs and operates speech-to-text and text-to-speech models offering over 1,400 voices on its platform. Edge Compute completes the stack by adding the runtime layer previously hosted externally. The unified infrastructure delivers sub-200ms round-trip times and simplifies operations through a single API, SLA, and bill. Data remains in-region by default for regulatory compliance. Edge Compute is available via Telnyx API and CLI.

Yahoo Finance
Jul 15th, 2026
Telnyx launches sovereign GPU infrastructure in Dubai for in-region MENA data processing

Telnyx has launched GPU infrastructure in Dubai, enabling enterprises to run AI inference workloads with data stored and processed entirely within the UAE. The infrastructure platform for real-time agents now owns and operates GPUs in Dubai, allowing customers to access compute, connectivity, and voice services under a single API and contract. The launch addresses growing regulatory pressure on Middle East enterprises to keep data in-region. Previously, companies had to integrate separate vendors for connectivity, voice, and inference, each requiring distinct contracts and compliance processes. Telnyx's Dubai cluster supports general-purpose AI workloads, including chatbots, document processing, and voice agents. The infrastructure runs frontier open-source models through an OpenAI-compatible API. With speech-to-text, inference, and text-to-speech all operating from the same Dubai facility, round-trip latency remains under 500 milliseconds. "Keeping data in-country is now non-negotiable," said CEO David Casem.