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Position: Solution Architect

Location: Richardson, Texas or Harrisburg, Pennsylvania or Remote

Reporting to: CTO (based in Europe)

Travel: Occasional domestic and international travel may be required for customer engagements, deployments, and industry events.

Role:

The Solution Architect acts as a senior technical Subject Matter Expert (SME) across pre-sales and professional services engagements, leading the architectural design of advanced mobile network solutions for wholesale and enterprise customers.

The role is responsible for translating customer, market, and business requirements into scalable, secure, and commercially viable mobile network architectures. Working closely with Sales, Engineering, Product, and strategic partners, the Solution Architect retains architectural ownership throughout the customer lifecycle while supporting delivery teams during implementation and onboarding.

This position is hands-on at the architectural level, customer-facing, and commercially aware, while remaining focused on design leadership rather than day-to-day operational execution.

The Solution Architect must demonstrate deep expertise across mobile core network technologies, including:

• 2G, 3G, and LTE EPC architectures.
• 5G Standalone (SA) and Non-Standalone (NSA) core networks.
• Service-Based Architecture (SBA) network functions and interfaces.
• Open-source core platforms and their production deployment.

The role provides architectural leadership across virtualization, containerization, and cloud-native deployment models, ensuring solutions are secure, resilient, and operationally scalable.

Tasks/Responsibilities:

• Pre-Sales
  • Capture and qualify customer technical requirements in close partnership with the Sales team, ensuring alignment with Limitless Mobile?s strategy, target markets, and solution portfolio.
  • Lead technical discovery sessions to understand customer needs, constraints, and success criteria.
  • Translate customer requirements into high-level solution architectures that are technically robust and commercially viable.
  • Present architectural concepts and solution designs to customers through workshops, conference calls, and on-site meetings.
  • Support the development of technical content for proposals, RFIs, RFPs, and RFQs, including architectural diagrams and written responses.

• Projects
  • Define and own High-Level Design (HLD) documentation for contracted customers.
  • Work closely with Engineering to ensure architectural intent is clearly understood prior to implementation.

• • Provide architectural oversight and guidance during deployment and onboarding phases.
  • Support Engineering with complex technical challenges and escalations where architectural input is required.
  • Deliver technical consultancy as part of professional services engagements.

• Operations
  • Provide technical account management for live wholesale customers, including Tier 3 support, if needed.
  • Act as a Tier-3 technical escalation point for complex issues requiring architectural analysis.
  • Provide technical account oversight for strategic wholesale customers, ensuring architectural consistency and long-term solution integrity.
  • Support root-cause analysis and post-incident reviews for major service-impacting events.

• Product Development
  • Design end-to-end mobile network architectures supporting LTE, 5G SA, and NSA deployments.
  • Define and guide cloud-native and containerized deployments using Docker, Kubernetes, and Helm.
  • Advise on integration with Service Communication Proxy (SCP), SEPP, roaming, and interconnect platforms.
  • Provide strategic input to the CTO on emerging technologies, evolving customer requirements, and industry trends.
  • Evaluate infrastructure enhancements, vendors, and potential technical partnerships.
  • Act as the primary technical interface between Limitless Mobile, internal teams, and strategic suppliers.

• Security, Interconnect & Compliance
  • Advise on interconnect security and regulatory compliance, including ISO/IEC 27001 and ISO/IEC 27011 alignment.
  • Design secure inter-PLMN connectivity, including SEPP architecture, TLS certificate management, and HTTP/2 signalling.
  • Ensure architectural compliance with lawful intercept, emergency services, and regulatory frameworks where applicable.

• Skills Development
  • Maintain and develop expertise across mobile core networks, cloud-native infrastructure, and emerging technologies.
  • Attend vendor briefings, technical training, and industry events as outlined by management.
  • Stay current with relevant 3GPP, GSMA, IETF, and industry standards.

Performance Measurement:

• Based on a combination of factors including:
  • Contribution to new customer and project wins as well as solution viability.
  • Revenue and gross margin impact of designed solutions.
  • Architectural quality, scalability and reusability.
  • Effectiveness of collaboration with Sales, Engineering and Product teams.
  • Customer satisfaction with technical engagement and outcomes.

Desired Expertise & Experience:

• General
  • Bachelor?s or master?s degree in computer science, telecommunications, or related field.
  • 5?8 years of experience designing and integrating mobile core network solutions for MNOs, MVNOs, or network equipment providers.

• Core Network & Architecture
  • Strong expertise in LTE EPC and 5G SA/NSA core architecture, including AMF, SMF, UPF, UDM, NRF, and associated call and data flows.
  • Hands-on experience with open source 4G/5G core platforms (e.g. Open5GS).
  • Understanding of SBA interfaces, NGAP, PFCP, NAS signalling, and IMS.

• Cloud, Infrastructure & Networking
  • Experience with virtualized and containerized environments using Docker, Kubernetes, Helm, and GitOps practices.
  • Strong IP networking knowledge (IPv4/IPv6), VPNs, IPSec, and secure interconnect design.

• Interconnect, Roaming & Voice
  • Understanding of roaming architectures, SEPP, SCP, and inter-operator connectivity.
  • Experience with IMS, SIP/RTP, VoLTE, VoNR, and VoWiFi.
  • Familiarity with private LTE, CBRS, and PNI-NPN interworking concepts is advantageous.

• Commercial & Customer Skills
  • Proven ability to translate customer needs into technically sound and commercially compelling solutions.
  • Experience creating high-quality proposals, architectural specifications, and responses to RFIs, RFPs, and RFQs.
  • Comfortable engaging directly with customers (internal and external).

Desired Personality:

• Entrepreneurial and proactive self-starter with a strong results orientation.
• Comfortable operating in a fast-paced, growth-focused environment with competing priorities.
• Detail-oriented, methodical, and well organised, while remaining flexible and adaptable.
• Able to work effectively both independently and as part of a team.
• Curious, self-motivated and committed to continuous learning.
• Strong analytical, problem-solving, communications and presentation skills.
• Positive, constructive mindset with a strong sense of ownership and accountability.