Full-Time
IMS Core Engineer
Architect
OXIO
51-200 employees
Programmable, cloud-native telecom services platform
No salary listed
Remote in USA
Remote
Bachelor's
 Electrical Engineering (1) |
|---|
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- At least 10 years of experience in the core network domain with mobile networks.
- A Bachelor of Science degree in Telecommunications or Computer Science is required, while postgraduate studies are a bonus.
- Working knowledge of 2G, 2.5G, 3G, and LTE networks, including MME, SGW, PGW, and MME.
- Conceptual understanding of IMS evolution and trends, IMS subsystems, functionalities, and IMS service call flows.
- Knowledge of IMS network topology, its interfaces, core IMS parameters, and features.
- Experience working on core nodes and technologies including CSFB, IMS, P-CSCF, I-CSCF, S-CSCF, MTAS, HSS, CUDB, and MGCF.
- Experience with SS7, ISUP, BICC, SIP, H248, and Diameter signaling and protocol configuration for IMS-based services.
- Experience operating and maintaining IMS platforms, including alarm and fault handling, trace analysis, backup and restore, fault diagnostics, preventive maintenance, and IMS node upgrades.
- Experience preparing and implementing configuration changes for IMS nodes and integrating IMS nodes such as S-CSCF, I-CSCF, MTAS, HSS, and CUDB.
- Hands-on experience with sniffers, Wireshark, and testing tools in advanced mode.
- Hands-on experience with Linux or Unix-based systems and Linux shell environments.
- Understanding of 3GPP, ITU-T, and ANSI standards.
- Understanding of roaming agreements and IR.21, including IREG testing.
- Experience troubleshooting VoLTE and analyzing call traces.
- Strong writing and documentation skills for developing reports.
- Ability to work under pressure and adapt to change.
- Fluency in written and spoken English.
- Availability to work morning and afternoon shifts.
- Ability to interact effectively with external customers and internal teams.
- Analyze, prepare, implement, and verify the configuration and integration of IMS nodes, networks, and systems.
- Manage networks and nodes within the IMS domain for 2.5G, 3G, and 4G networks, including SIP, H323, IMS/IMT, VoLTE, and VoWiFi.
- Use and build dashboards to discover issues and patterns quickly.
- Follow internal and external communication procedures when handling incidents, including communication with third-party providers.
- Perform maintenance, troubleshooting, security audits, and emergency response.
- Handle faults and corrective actions at the node, service, and infrastructure levels.
- Handle project activities involving new or adapted IMS end-to-end service functionalities, nodes, and services.
- Cover 7x24 monitoring shift responsibilities, including on-call support and babysitting activities, when needed.
- Use Wireshark to trace critical infrastructure and debug issues.
- Provide input on, implement, and verify improvements to processes and work instructions.
- Verify and implement configuration changes.
- Identify and drive improvements.
- At least 2 years of scripting experience with Python, Bash, or similar scripting languages.
- Postgraduate studies are a bonus.
OXIO provides a Telecom-as-a-Service (TaaS) platform that lets enterprises, developers, and mobile network operators launch and manage their own branded wireless services without building extensive telecom infrastructure. The platform is cloud-native and programmable, offering a fully documented API that clients use to integrate and deploy mobile services, including global connectivity for M2M and IoT devices. By abstracting telecom complexity behind APIs and a scalable cloud platform, OXIO enables faster, lower-cost product testing and deployment for multinational brands seeking new mobile offerings. The company differentiates itself by democratizing telecom—delivering a flexible, API-driven, cloud-based solution that reduces time and cost compared to traditional telecom integration, and by expanding its reach to global M2M customers. Its goal is to help clients quickly and affordably launch and manage their own mobile services at scale.
Company Size
51-200
Company Stage
Series B
Total Funding
$54M
Headquarters
Mexico City, Mexico
Founded
2018
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Simplify's Take
What believers are saying
- June 2026 Advanced Core Routing opened AI fraud detection and compliance revenue.
- May 2026 hire Jeremy Bolton strengthens enterprise sales and partnerships globally.
- 2025 closed above 2 million activated lines, backed by AWS and Mavenir partnerships.
What critics are saying
- Movistar Mexico still needs approvals; a blocked deal kills OXIO's biggest scale-up.
- Telecom core ownership invites outages, compliance failures, and churn during integration.
- If Movistar integration slips, capital strain and credibility damage threaten OXIO's survival.
What makes OXIO unique
- OXIO owns the telecom core, enabling network-layer routing and compliance, not app overlays.
- Its cloud-native TaaS unbundles carrier infrastructure, letting brands launch wireless services quickly.
- Movistar Mexico would pair OXIO software with 20-million-subscriber operator scale.
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Benefits
Incentive stock options
Health & dental insurance
401(k)
Life insurance
Offices in amazing cities with a remote friendly option as well
Growth & Insights and Company News
6 month growth
↓ -2%1 year growth
↓ -1%2 year growth
↓ -1%OXIO launches Advanced Core Routing, enabling AI, real-time fraud detection and compliance in the telecom core. New platform-native capability enables mobile call and text interception, complex routing and analysis before delivery without third-party apps or customer friction. Jun 25, 2026 Prev Next 1 of 42,789 OXIO, the leading Telecom-as-a-Service (TaaS) platform, announced the launch of Advanced Core Routing (ACR), a network-native capability that gives enterprises and brands real-time, bi-directional control over mobile voice and messaging traffic through OXIO's telecom ecosystem. A native-intercept layer built into OXIO's cloud-native telecom core, ACR enables organizations to prevent fraud, provide custom, real-time routing and decisioning, strengthen subscriber protections, enforce compliance policies and power AI-driven actions in real-time before communications reach the subscriber. The launch comes as global enterprises face growing pressure to address spam, fraud and regulatory communication risks across the telecom ecosystem. In 2025, Americans received an average of 2.7 billion spam and unwanted calls every month, while telephone scams resulted in an estimated $25.4 billion in losses in 2023. Financial institutions have also faced billions of dollars in penalties tied to unauthorized communications and compliance failures. "Businesses are increasingly reaching out in search of intelligent network capabilities that solve unique use cases that are only possible with full ownership of the telecom stack," said Nicolas Girard, Founder and CEO of OXIO. "Advanced Core Routing fundamentally changes how enterprises can manage mobile communications. For the first time, organizations can apply AI, real-time fraud detection and compliance controls directly within the communication path before calls and messages ever reach the subscriber." OXIO's ACR operates natively within its telecom core, enabling real-time voice and SMS routing with ultra-low latency and transparent network-level controls across subscriber communications without requiring device software or endpoint applications. MVNOs and enterprises can apply intelligence within the communication path to combat spam, fraud and compliance risk. OXIO has commercially deployed ACR through its partnership with Umony, a leading communications compliance platform for regulated industries. Together, the companies are delivering a native mobile compliance solution for financial institutions that intercepts, monitors and archives communications directly at the network layer - helping prevent unauthorized "off-channel" communications before they occur. Telecom cores are evolving from passive infrastructure layers into programmable intelligence layers for enterprise communications. "What OXIO has built with Advanced Core Routing creates an entirely new foundation for adding value services in mobile communications," said Dean Elwood, CEO of Umony. "Because OXIO controls its telecom core, we were able to move from concept to deployment faster than would be possible within a traditional carrier environment. Together, we've enabled financial institutions to move beyond reactive compliance and into real-time enforcement and intelligence directly within the mobile network." Beyond financial services, OXIO sees broad applications for ACR across industries looking to reduce spam and fraudulent calls, protect vulnerable consumers such as senior citizens or minors, enable AI-native customer experiences and modernize enterprise communications.
OXIO, a Telecom-as-a-Service platform, has launched Advanced Core Routing (ACR), a network-native capability enabling real-time control over mobile voice and messaging traffic. The technology allows enterprises to intercept and analyse communications before delivery, enabling AI-driven fraud detection and compliance enforcement without requiring third-party applications. The launch addresses growing fraud concerns, with Americans receiving 2.7 billion spam calls monthly in 2025 and telephone scams causing $25.4 billion in losses in 2023. Operating within OXIO's cloud-native telecom core, ACR provides ultra-low latency routing with sub-50 millisecond response times. OXIO has commercially deployed ACR through a partnership with Umony, delivering network-layer compliance solutions for financial institutions. The technology is now available to all OXIO customers across multiple industries.
OXIO appoints former Verizon executive Jeremy Bolton as chief commercial officer. May 1, 2026 * Seasoned wireless leader to drive global commercial strategy at a pivotal moment of growth New York - OXIO, a leading Telecom-as-a-Service (TaaS) platform, today announced the appointment of Jeremy Bolton, former Visible and Verizon executive, as Chief Commercial Officer (CCO), as the company enters a new phase of accelerated global growth. Bolton brings more than 20 years of experience in the U.S. wireless industry, where he led initiatives across go-to-market strategy, partnerships, product innovation, and digital transformation. He also played a key role in the creation and launch of Visible, Verizon's all-digital wireless brand. As CCO, Bolton will lead OXIO's global commercial organization, with responsibility for revenue growth, partnerships, and go-to-market execution. "Jeremy understands how this market is evolving and knows how to bring the right teams and commercial models together to accelerate our strategy and drive growth," said Nicolas Girard, CEO of OXIO. "What stands out most is his fit with OXIO - he has exactly the right DNA for how we build and scale. Jeremy knows how to challenge legacy thinking, operate at pace, and translate platform capabilities into meaningful customer and revenue outcomes. His experience driving innovative commercial models makes him an ideal leader for this next phase of growth." "I'm excited to lead the commercial organization at such a pivotal moment for OXIO," said Bolton. "The future of connectivity will be defined by how seamlessly it integrates into the products and services people use every day. We've moved beyond traditional models toward a world where any company can embed wireless into its offering, and OXIO is already powering that shift at a global scale."
OXIO, a Telecom-as-a-Service platform, has appointed Jeremy Bolton as Chief Commercial Officer to lead its global commercial organisation. Bolton brings over 20 years of US wireless industry experience, including executive roles at Verizon and a key role in launching Visible, Verizon's digital wireless brand. The appointment comes as OXIO, ranked number one in Juniper Research's 2026 MVNO Solutions Report, enters an accelerated growth phase. The company recently agreed to acquire Movistar Mexico, which has around 20 million subscribers, pending regulatory approval. Bolton will oversee revenue growth, partnerships and go-to-market execution. OXIO's platform enables businesses to launch and manage wireless services using cloud-native architecture, currently supporting over 2 million activated lines.
OXIO, a Telecom-as-a-Service platform, closed 2025 having surpassed 2 million activated lines and announced strategic partnerships with AWS and Mavenir. The company provides programmable, cloud-native connectivity solutions across sectors including borderless MVNOs, identity verification, financial communications and machine-to-machine deployments. The New York-based company received industry recognition including Frost & Sullivan's Global Telecom-as-a-Service Transformational Innovation Leadership Award. OXIO also achieved regulatory milestones, obtaining its FCC licence and completing VoLTE certification for the United States. The company strengthened its leadership team with appointments across customer experience, sales, product management and legal functions. OXIO launched mobile applications, enhanced M2M capabilities and scaled its customer support operations to support global expansion in 2026.