Company: Jack & Jill
Location: London
Job Description:
Job Title
Technical Lead / CTO
Salary
Not Disclosed
Company Description
Mission-driven London startup building national security and critical infrastructure software
Job Description
As the first technical hire, you will architect and build a modular, interoperable platform to detect and respond to cross-domain security threats. You will design a system that synthesizes signals from cyber, physical, and information domains, translating complex real-world national resilience problems into robust, production-ready software for high-consequence environments.
Location
London, UK
Why this role is remarkable
- Full technical ownership of a mission-critical platform from a completely blank slate, with direct influence on the company’s product direction.
- Opportunity to build foundational technology for national security and defense, tackling complex problems that existing siloed systems cannot solve.
- Meaningful equity is available, offering a co-founder level stake or early employee options for a truly vested interest in the mission.
What You Will Do
- Design and implement a scalable system architecture that integrates multiple external SME technologies and disparate data sources.
- Work directly with the CEO to prototype and build the synthesis layer that produces decision-ready intelligence for government clients.
- Own the entire engineering lifecycle, from selecting the tech stack and tooling to hands‑on development and future team building.
The ideal candidate
- 5–10 years of experience in hands‑on engineering with strong architectural judgment in integration-heavy or distributed systems.
- Proven ability to build robust software from first principles, staying deep in the code while navigating high-level product ambiguity.
- Strong motivation for mission-driven work in national resilience, with the existing legal right to work in the UK.
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Posted: June 2nd, 2026