CTO | Founding Team | Path to Co-Founder

CTO | Founding Team | Path to Co-Founder

Israel | Pre-Seed | Active Fundraising | Digital Trust & Fraud Prevention

AI is making digital, voice and human impersonation more convincing than ever. Nearly everyone has received, or will receive, a message, call or digital interaction that appears completely legitimate, while leaving one fundamental question unanswered:

How do I know who I’m really communicating with?

CyCall is being built to solve exactly that problem.

We are creating a Digital Trust & Verification layer that enables people to verify the identity of the organization and the representative acting on its behalf throughout the entire interaction, from the initial contact, through the conversation and engagement, all the way to the action or transaction itself.

Our goal is not only to detect fraud after it happens, but to create a verified and trusted communication flow by design, a new trust layer between organizations and their customers.

CyCall is currently at the pre-seed stage and actively fundraising, with an initial working product, an existing development team, early market interest, and ongoing conversations with potential design partners and investors.

We’re looking for a hands-on CTO to become the technical and security owner of CyCall and shape the next stage of the company.

This is a deeply technical builder role, joining at a point where there is already an initial product and development team, but the core architecture, security model and technical direction are still open to define.

You will make the critical technical decisions, work directly with the existing development team, and personally engage in the complex parts of the product where your judgment matters most.

At the same time, you will be a key customer-facing technical leader, someone who can engage senior fraud, security and technology teams, understand their concerns, challenge assumptions, explain the architecture clearly, and build confidence in both the solution and the technical direction.

This role is about owning both the technical substance and the technical conversation around it.

• Own the end-to-end system and security architecture of the product.
• Design the core authentication, verification and cryptographic mechanisms, including identity, attestation and key-management approaches.
• Lead threat modeling and adversarial thinking, designing the system with sophisticated attackers in mind.
• Make the critical architectural and implementation decisions required to move from an early product to a production-grade platform.
• Lead the existing development team while remaining hands-on in the most critical technical areas.
• Act as the technical authority in discussions with customers, design partners and external technical stakeholders.
• Work directly with fraud, security and technology teams at prospective customers to understand their environment, articulate the solution and address technical objections.
• Translate customer and design-partner feedback into architectural and product decisions.
• Build Security, Privacy and Enterprise Readiness into the product from day one.
• Make the technical decisions around Mobile, Messaging and Telecom constraints that shape what can be built.
• Own the technical roadmap and help shape the company’s technical narrative with customers, partners and investors.

• Deep, practical experience in Applied Security / Cybersecurity.
• Strong understanding of areas such as Cryptography, Authentication Systems, Secure Protocol Design and Threat Modeling.
• Proven experience architecting and building secure Backend or Distributed Systems.
• A true builder mindset, someone who is still comfortable going deep, writing code and implementing critical parts of the system when needed.
• Strong architectural judgment and the ability to make consequential technical decisions without an established playbook.
• Ability to lead a small, high-quality development team with speed, clarity and minimal bureaucracy.
• High comfort with early-stage ambiguity, rapid iteration and significant ownership.

We are specifically looking for someone who can combine deep technical credibility with strong external presence.

You should be comfortable:

• Engaging directly with senior Fraud, Security and Technology teams.
• Explaining complex security architecture in a clear and compelling way.
• Defending technical decisions under scrutiny.
• Asking the right questions in customer conversations and turning them into better product and architecture decisions.
• Building technical trust with sophisticated enterprise stakeholders.

This is not a technical sales role, but the ability to represent and defend the technology externally is a core part of being successful in the position.

Highly relevant experience in:

• Fraud Prevention
• Anti-Abuse
• Identity Fraud
• Impersonation
• Transaction Risk
• Trust Infrastructure

Experience building or architecting systems designed to identify, prevent or mitigate fraud is a major advantage.

Experience in:

• Telecom infrastructure
• Messaging platforms
• SIP
• SMS
• CPaaS
• Carrier Signaling
• STIR/SHAKEN

Experience in one or more of the following:

• Mobile Security and iOS / Android platform constraints.
• Identity and Authentication infrastructure.
• Products built for regulated or security-sensitive enterprise environments.
• Banks, financial institutions or organizations with demanding security requirements.
• Security Reviews, Privacy, GDPR, SOC 2 or related compliance frameworks. CTO Cycall September.

CyCall is at the stage where the most important decisions are still open, but the journey has already started.

There is an initial product, a development team in place, early market engagement, and active fundraising. The next step is to bring in the technical leader who will define the architecture, security core and technical direction of the company.

You won’t be inheriting a mature system or optimizing someone else’s decisions. You’ll be helping shape the core while working directly with customers, partners, the founding team and investors.

You’ll be working on a large and rapidly growing problem that is becoming more urgent in the AI era.

For the right person, this is a company-defining CTO role with meaningful ownership and a clear path to Co-Founder status, based on shared milestones, contribution and long-term mutual fit.

Contact:

Keren Halperin | Kinettica

[email protected]