Chief Technology Officer

🚀 Founding CTO & Co-Founder: Connectivity Platform Infrastructure

eSIM | Telecom Infrastructure | Device Engineering | Platform Systems

🌍 Location: Remote / Global

📈 Structure: Full-time with vested equity

🎁 Equity: Meaningful founding-level ownership

Ringo is building a global connectivity platform powered by eSIM technology, enabling seamless international mobile data access without physical SIM cards. As we soft-launch our MVP and expand internationally, eSIM reliability, roaming performance, device compatibility, and telecom infrastructure partnerships are becoming core competitive advantages. We are looking for a Founding CTO & Co-Founder to architect and lead the technical backbone of the company, combining telecommunications infrastructure leadership, platform architecture, device engineering, and telecom partnership development. You will work directly with the founder to design, build, and scale a global telecom platform from the ground up.

As Founding CTO & Co-Founder, you will own the technical architecture, connectivity infrastructure, and telecom partnerships that power Ringo's platform. You will lead the development of the global eSIM infrastructure, device compatibility systems, and the core platform architecture while also negotiating and managing strategic partnerships with telecom providers, roaming hubs, MVNO partners, and connectivity platforms. This role requires both deep technical expertise and commercial capability within the telecom ecosystem.

⚙️ Key Responsibilities

📡 eSIM & Connectivity Infrastructure

Design, implement, and operate Ringo's global eSIM connectivity stack, including designing and validating eSIM profiles (MVNO and roaming) compliant with GSMA SGP.22, managing the Remote SIM Provisioning (RSP) lifecycle, optimizing eSIM profile structure and download performance across 3G, 4G, and 5G networks, executing OTA campaigns (eUICC updates, policy updates, steering logic), owning Steering of Roaming (SoR) logic across global networks, analyzing APDU logs and debugging Remote File Management (RFM) issues, and improving activation reliability across device, SIM, and network layers.

🏗️ Platform Architecture & Infrastructure

Architect and build the core platform infrastructure powering Ringo's services by designing scalable backend architecture, defining core APIs and integration layers, managing integrations with MVNO partners, roaming hubs, connectivity platforms, and eSIM vendors, translating telecom constraints and regulatory requirements into architecture decisions, establishing monitoring, reliability, and provisioning systems, defining build-vs-buy infrastructure decisions, and setting engineering standards and long-term platform architecture.

📱 Device Engineering & Compatibility

Ensure seamless connectivity across the global smartphone ecosystem by testing and validating Local Profile Assistant (LPA) behavior on flagship devices including iPhone, Samsung Galaxy, and Google Pixel, managing Apple Carrier Bundles and Android network configurations (GSMA NSX), navigating and debugging eUICC file systems, conducting OTA validation and device testing, and maintaining compatibility across evolving OS and modem firmware updates.

🤝 Telecom Partnerships & Deal Negotiation

Lead technical and strategic relationships with telecom infrastructure partners by negotiating connectivity agreements with telecom operators and MVNO partners, building partnerships with global roaming providers and connectivity platforms, managing relationships with eSIM vendors and infrastructure providers, and representing Ringo in technical and commercial discussions with carriers and telecom partners worldwide.

🎯 Must-Have Qualifications

📡 Connectivity & Device Expertise

3+ years experience with mobile device configuration or OTA testing

Strong understanding of APNs, VoLTE, VoWiFi

Experience with Apple Carrier Bundles and Android network configuration (GSMA NSX)

Hands-on experience navigating eUICC file systems

Experience working with MVNOs, roaming partners, or connectivity platforms

Strong debugging capability across device, SIM, and network layers

🏗️ Platform & Systems

Experience designing platform or infrastructure systems

Experience with API-driven integrations

Exposure to regulated or multi-partner environments

Strong prioritization and systems thinking

Ability to operate in early-stage startup environments with ambiguity

🌐 Technical Web Infrastructure

Understanding of technical SEO fundamentals

Experience maintaining production web environments

Familiarity with performance optimization, analytics, and traffic monitoring

💥 Why This Role Is Critical

As Founding CTO & Co-Founder, you will build the core connectivity platform powering the company, reduce activation failures and support load, improve global roaming performance, strengthen credibility with Tier-1 carrier partners, future-proof the eSIM stack as GSMA standards evolve, and architect the infrastructure foundation of a global telecom platform.

📩 How to Apply

Send:

- A short note explaining why telecom infrastructure and global connectivity problems interest you

- Examples of complex systems you've built or operated

- Any experience with eSIM, roaming, device configuration, or connectivity platforms

• Qualified candidates will receive further details during discussions.