---
title: 'Senior Engineer I(UK region) at Menlo Security'
canonical: 'https://feeny.ai/job/senior-engineer-i-uk-region-menlo-security-united-kingdom-k1vnbr1ed768'
type: 'job'
last_seen: '2026-09-11'
---

# Senior Engineer I(UK region) at Menlo Security

- **Company:** Menlo Security
- **Location:** United Kingdom
- **Employment:** full-time
- **Work type:** remote
- **Posted:** 2026-04-15
- **Last confirmed live:** 2026-09-11
- **Apply:** https://jobs.ashbyhq.com/menlosecurity/f6e658d0-1388-463b-8109-2716a64335a3

## Job description

Menlo Security is the leader in Browser Security for human and agentic workforces. Our mission is to enable humans and agents to connect, communicate, and collaborate securely, without compromise. The Menlo Browser Security Platform protects organizations from cyberattacks by stopping threats across the web, documents, and email before they reach the user. With Menlo Agent Runtime Security (MARS), that protection now extends to the AI agents working alongside every employee. Menlo Security is trusted by major global businesses, including Fortune 500 companies and government agencies, to protect their most valuable asset, their data, and is backed by top-tier investors.

## About the role

Menlo Security is looking for talented engineers to join our US/UK Web Isolation team. You will be responsible for extending and supporting our world-class remote browser technology on desktop and mobile platforms, serving millions of users on Menlo’s worldwide cloud. Example work areas include Chromium internals, networking, video/audio, advanced HTML5 features, containerization, load balancing, scaling and cost-saving; all of it with a strong security focus. The Web Isolation team is highly experienced and collegial, with a strong design and code review culture. We encourage candidates with deep systems-level experience in non-browser technology areas to apply if you feel your skill set can be applied to new challenges. The blog posting https://www.menlosecurity.com/blog/the-mobile-isolation-era-begins gives an introduction to some of those challenges.

## Your Experience

The ideal candidate already understands browsers at a deep level. You have (or will gain) rich experience in Chromium internals, networking, video/audio, and advanced HTML5 features such as WebGL and WebRTC.

Requirements for the role include: ● Excellent C++ skills. ● Ability to use modern AI tooling in development workflows ● Strong knowledge of Python, Rust and Javascript are highly desirable ● Strong networking fundamentals ● Strong knowledge of HTTP security is highly desirable ● Experience implementing and maintaining features in Chromium or other browser platforms at various layers, including content, browser, core, compositor, skia and networking ● Systems-level Linux experience ● Good to have: Tornado, haproxy, AWS EC2, WebGL, WebRTC, font rendering, input experience including IME and contenteditable ● Ability to write clean, concise and maintainable code ● Strong written and verbal communication skills ● Proactive, ambitious, and strong ability to learn new things ● Highly organized and detailed with critical attention to detail and documentation ● BSc or higher degree in Computer Science or related field.

## MSGL-I4

Follow us on [LinkedIn](https://www.linkedin.com/company/menlo-security/)! Why Menlo? At Menlo, we don't settle for the status quo — in our technology or our culture. How we think and act is just as important as what we build. Our culture is defined by five core mindsets: Proactive Leadership, Straight Talk, United Impact, Elevated Talent, and Customer-Compelled. We take ownership and drive outcomes without waiting to be told. We communicate directly and seek hard truths. We break down silos and win together. We hold a high bar for ourselves and the people around us. And we treat every customer interaction as mission-critical. If you're someone who sees it, owns it, solves it, and does it — you'll thrive here. All qualified applicants will receive consideration for employment without regard to race, sex, color, religion, sexual orientation, gender identity, national origin, protected veteran status, or on the basis of disability. TO ALL AGENCIES: Please, no phone calls or emails to any employee of Menlo Security outside of the Talent organization. Menlo Security’s policy is to only accept resumes from agencies via Ashby (ATS). Agencies must have a valid services agreement executed and must have been assigned by the Talent team to a specific requisition. Any resume submitted outside of this process will be deemed the sole property of Menlo Security. In the event a candidate submitted outside of this policy is hired, no fee or payment will be paid.

## About Menlo Security

## Company Overview
- **One-liner**: Menlo Security provides a unified browser security platform that protects enterprises from internet-borne threats and data leakage for both human users and AI agents.
- **Entity Type**: Private (Series D; $250.8M total funding)
- **Headquarters**: Mountain View, California, United States
- **Founded**: 2014
- **Founders**: Amir Ben‑Efraim (co‑founder & former CEO; left Feb 2026)

## Core Business
- **Industry**: Computer and Network Security (cybersecurity)
- **Target Customers**: B2B, large enterprises, financial institutions, governments
- **Mission / Purpose**: “Enable the world to connect, communicate and collaborate securely without compromise.”

## Products & Services
- **Menlo Browser Security Platform** – The core offering, a hybrid (local + cloud) solution that secures any browser, enforces zero‑day threat prevention, file security, and data protection for both humans and AI agents. Delivered via a single control plane.
- **Menlo Secure Extension** – Local browser extension providing DLP and visibility for trusted web applications.
- **Menlo Cloud** – Cloud‑based rendering and threat elimination for high‑risk browsing sessions.
- **ConnectAI** – Bridges AI agents and workflows to legacy enterprise data without requiring API or system overhauls, enabling secure autonomous agent operations.

## Market Standing
- **Valuation / Market Cap**: Not disclosed
- **Annual Revenue**: ~$100 M (LinkedIn estimate)
- **Total Funding**: $250.8 M (Series C, D, B, Seed)
- **Notable Investors / Partners**: J.P. Morgan Asset Management (lead Series D), Sutter Hill Ventures, Osage University Partners; used by “8 of 10 of the world’s largest banks”
- **Growth Signals**: Headcount of 325 employees (+4.4% YoY), operates in 17 countries, claims protection against 90% of attacks, expanding into AI agent security, active hiring (+141.7% YoY job postings)

## Competitive Advantages
- **Hybrid Architecture**: First solution combining local browser security controls with cloud‑based threat elimination, ensuring performance and protection simultaneously.
- **Unified Human‑Agent Security**: Treats human users and AI agents as equal participants under the same policy framework – a unique approach that addresses the “Agentic Paradox.”
- **Proven Track Record**: Deep penetration in highly regulated industries; 8 of 10 largest banks rely on Menlo.

## Strategic Focus
- **Securing AI Agents**: Extending the platform to cover autonomous browser agents (e.g., Copilot, sidebar agents) that create new threat vectors. ConnectAI enables safe agent access to legacy data without modernization debt.
- **Expanding Global Footprint**: With offices in North America, Europe, Asia Pacific, and the Middle East, the company is scaling its sales and engineering teams to support international demand.
- **Continuous Innovation**: Developing unified policy, visibility, and control for the fluid nature of hybrid work, including both human and silicon users.

## Why Work Here
- **Culture & Values**: Emphasizes empathy, creativity, execution, collaboration, and alignment. Described as a “collaborative, problem‑solving” environment where employees are empowered to make a meaningful impact.
- **Work Policy**: Flexible remote work available globally; offices in Mountain View (HQ), Bracknell (UK), Bengaluru (India), Singapore, Tel‑Aviv, Tokyo, and others.
- **Perks**: Competitive stock options, comprehensive health plans, excellent PTO, mental health days, catered lunches, wellbeing initiatives (meditation, EAP), and equity‑first diversity & inclusion focus.
- **Engineering Culture**: “When something doesn’t work, we fix it, record it, and share it.” Employees are encouraged to take calculated risks, learn from failures, and define new ways of thinking for the industry.
- **Note**: CEO and co‑founder Amir Ben‑Efraim left in Feb 2026; leadership is in transition. The company continues to hire actively, with 29 open positions across engineering, sales, marketing, and support.

## Sources
1. [menlosecurity.com](https://www.menlosecurity.com/)
2. [menlosecurity.com – About](https://www.menlosecurity.com/about)
3. [menlosecurity.com – Life at Menlo](https://www.menlosecurity.com/about/life-at-menlo)
4. [LinkedIn – Menlo Security Inc.](https://www.linkedin.com/company/menlo-security)
5. [Menlo Security Jobs on Ashby](https://jobs.ashbyhq.com/menlosecurity)

## Other roles at Menlo Security

- [Recruiting Coordinator](https://feeny.ai/job/recruiting-coordinator-menlo-security-united-states-tg7r4p0wffxd) — United States
- [External Post](https://feeny.ai/job/external-post-menlo-security-israel-wrss3aah5z8m) — Israel
- [Customer Success Manager - Japan](https://feeny.ai/job/customer-success-manager-japan-menlo-security-apac-japan-5s4ckbkpcxqk) — APAC / Japan
- [Senior Engineer I (Auth)](https://feeny.ai/job/senior-engineer-i-auth-menlo-security-canada-mzsgc3jpa32v) — Canada
- [Senior Software Engineer](https://feeny.ai/job/senior-software-engineer-menlo-security-united-kingdom-d620dmmewnt5) — United Kingdom
- [Senior Software Engineer (Chromium)](https://feeny.ai/job/senior-software-engineer-chromium-menlo-security-united-kingdom-0c1xd8e04b4e) — United Kingdom
- [Senior Product Designer](https://feeny.ai/job/senior-product-designer-menlo-security-apac-india-62xrk2467cbk) — APAC / India
- [Sales Engineer - Mumbai](https://feeny.ai/job/sales-engineer-mumbai-menlo-security-apac-india-e2sqb32qtp5t) — APAC / India
- [Senior Software Engineer I](https://feeny.ai/job/senior-software-engineer-i-menlo-security-apac-india-rw5yf395yqyk) — APAC / India
- [Senior Security Engineer - Pentester](https://feeny.ai/job/senior-security-engineer-pentester-menlo-security-canada-ektg4a700nzs) — Canada