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Systems Engineer Equity Series AI security startup

Job in Greater London, London, Greater London, W1B, England, UK
Listing for: Jack & Jill
Full Time position
Listed on 2026-06-11
Job specializations:
  • IT/Tech
    Cybersecurity, Systems Engineer
Salary/Wage Range or Industry Benchmark: 150000 - 195000 GBP Yearly GBP 150000.00 195000.00 YEAR
Job Description & How to Apply Below
Position: Systems Engineer (£150k–£195k + Equity) at $25M Series A AI security startup
Location: Greater London

Job Title

Systems Engineer

Salary

£150k–£195k + Equity

Company Description

$25M Series A cybersecurity startup backed by Next
47, Ten Eleven Ventures, and In-Q-Tel

Location

London, UK

Why this role is remarkable
  • Work at the bleeding edge of AI governance, building the security layer for a world where every enterprise employee uses an AI copilot.
  • Join a high-traction startup led by experienced founders who previously scaled Digital Shadows, supported by top‑tier investors like In‑Q‑Tel and Next
    47.
  • Total ownership over core architecture with a highly technical team that values Rust, memory safety, and high‑performance systems engineering.
What You Will Do
  • Design and optimize security agent components in Rust, ensuring sub‑500 ms inference and zero‑touch data protection on user devices.
  • Conduct technical research to implement cross‑platform signals and controls for data movement across Windows, macOS, and Linux subsystems.
  • Build robust, CI‑tested deployment mechanisms for client‑facing releases that maintain high reliability and performance under real‑world conditions.
The ideal candidate
  • Deep production experience in Rust or C++ with a strong focus on systems programming concepts like memory safety, concurrency, and IPC.
  • Proven track record building security‑critical client software such as endpoint agents, EDR/XDR components, or low‑level OS utilities.
  • AI‑forward mindset with the ability to leverage modern tools like Claude Code or Cursor to accelerate high‑expertise systems development.
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