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Rein Security
Runtime security for enterprise AI agents
- 31
- GCCSVCCV+6
- Tel Aviv
- AI
Open roles at Rein Security
4 positions we're tracking, re-checked daily
- apply ↗
Runtime / Sidecar Engineer (agent instrumentation, Tel Aviv)
tel aviv, israel & new york, usaMid-levelfirst seen today - apply ↗
Security Researcher, Agent Breakers (offensive agent research)
tel aviv, israel & new york, usaMid-levelfirst seen today - apply ↗
Enterprise Account Executive (New York)
tel aviv, israel & new york, usaMid-levelfirst seen today - apply ↗
Solutions / Sales Engineer (New York)
tel aviv, israel & new york, usaMid-levelfirst seen today
Know when Rein Security is hiring before anyone else
A role stays uncontested for about four days. Here's the window, and where we put you in it.
From $5.99/week, cancel any time.
- live
- +2h+2hrole spotted & verified1
- +4h+4hyou get the alert1
- day 3day 3you've applied~8
- day 7+day 7+hits the job boards250+
What Rein Security is building
Rein deploys as a sidecar at the runtime where agents and AI apps actually execute. It traces every action an agent takes (every DB access, every API call) back to the line of code that triggered it and connects it to a business outcome. Security teams define what each agent should and shouldn't do, Rein baselines its behavior, and out-of-role actions get blocked before they run, without taking the agent down. The architectural bet is about position, not detection. Rein explicitly isn't an AI gateway, a proxy or eBPF. Gateways see prompts. Rein sees what the agent did with them, and because it sits alongside the agent no customer data is routed out of the organization. On top of that it does posture work: code security, vulnerability management and supply-chain checks focused on what's actually exploitable in the agentic runtime. The examples they publish show the problem. An onboarding agent opened an ordinary-looking PDF with a hidden prompt injection telling it to act outside its role, and Rein blocked the out-of-role action. Its Agent Breakers research team showed at Black Hat USA 2026 how they compromised a live, customer-facing shopping agent at a major US retailer. Customers named publicly include Lemonade and Dun & Bradstreet, and H&R Block's global CISO is quoted on the site.
Why this matters
Agents have moved from pilots into production, with real permissions. Rein cites IDC saying 95% of companies now run AI agents in production, and Gartner projecting the market for securing AI at nearly $4.8B in 2027 (up 68.7% from 2026) and nearly $7.7B by 2028. The risks that matter don't show up in a code scan or a gateway log. They show up as behavior several steps removed from the user's request: a poisoned document, a manipulated customer-facing agent, or trust passed from one agent to another. Attackers now use frontier models too, which pushes security from 'detect, investigate, patch' to 'block first, fix after'. That requires something sitting at the point of execution.
Investors: Glilot Capital (co-lead), Sienna Venture Capital (co-lead), Corner Ventures, Atlacle, RNP Capital Advisors, Seed angels: Ofer Ben-Noon (Talon), Amir Jerbi (Aqua Security), Dror Davidoff (Aqua Security), Yoav Alon (Orca Security)
Hiring outlook
The Series A post says the money goes partly to 'hiring across our teams in New York and Tel Aviv'. The About page says they're 'actively recruiting for both go-to-market and engineering roles', and Matan's LinkedIn headline reads 'I'm Hiring!'. There's no public job board, so applications go to [email protected].
Working at Rein Security
Rein Security is a AI company based in Tel Aviv, Israel & New York, USA. For a AI company this size, the reality is broad remit, direct access to founders, and equity that still means something if the company works out.
Most Rein Security jobs are based in Tel Aviv, Israel & New York, USA.
How to actually get hired at Rein Security
Why applying the normal way doesn't work
With only <50 employees, Rein Security doesn't have dedicated recruiters. Founders review applications between running the company. The challenge isn't competition — it's visibility. Direct outreach wins.
Who to contact at Rein Security
- Who decides
- a founder or department head
- Best channel
- LinkedIn or direct email
Founding team
Matan served as an officer in Unit 8200, then joined Cyberbit as Director of Sales for the EU market and was named Employee of the Year in 2017. After Elbit acquired Cyberbit he became Regional Director in the Netherlands, growing regional revenue to tens of millions of dollars. He then ran his own consultancy advising early-stage startups on GTM and product-market fit before co-founding Rein in 2024.
Netanel was a pentester at 16 and went on to find vulnerabilities in WordPress, Wikipedia and Magento. After Unit 8200 he led Check Point's vulnerability research team, then founded Holcy in 2018, which Elbit acquired in 2020. At Elbit he became head of strategic cyber technologies and later CTO of the cyber division. Rein is his second company.
What to show them
Build a deliberately vulnerable multi-agent workflow (for example, a planner agent passing tasks to a tool-using executor), then show a working chain where one poisoned input upstream ends in a real side effect downstream. Write it up with the exact runtime trace that would have caught it.
A cold email that works at Rein Security
What Rein Security screens for
Glilot led both the $8M seed and this round, and the seed's angels are the founders of Talon, Aqua and Orca, three Israeli security companies that each defined a category. That cap table believes 'agent runtime security' is the next category of that kind. The arc is visible too: the January seed pitch was runtime AppSec (API security, SCA reachability in production), and nine months later the same sidecar is aimed squarely at agents, with 8x revenue to show for it. At 31 people, with Black Hat research as top-of-funnel and named enterprise customers like Lemonade and Dun & Bradstreet, the next hires will set how the engineering and sales teams work.
Don't send a generic CV to Rein Security. Mirror the job posting's language to get past automated screening.
Don't make these mistakes
Opening with 'I'm excited about AI security' or a list of OWASP LLM Top 10 buzzwords. Netanel was a pentester at 16, hacked WordPress, Wikipedia and Magento, led Check Point's vulnerability research team, and sold his first company, Holcy, to Elbit. Theory won't impress him. Also don't pitch gateways or prompt filtering as the answer, because Rein's entire position is that gateways only see prompts and miss what the agent actually does.
Mistakes that kill Rein Security applications
A recycled CV gets rejected fast at Rein Security (<50 people). They notice.
Lead with their problem, not your ambition. Rein Security is focused on Agents have moved from pilots into production, with real permissions — show you understand that.
Don't apply and wait. The median AI application gets no response ever. One follow-up at day five roughly doubles reply rates.
Applying to Rein Security? Get the contact, not the form.
The Rein Security interview process
We don't yet have verified candidate reports for Rein Security. What follows is the typical process for a <50-person AI company, so treat it as a model, not confirmed detail.
Interview stages
- 1
Intro Call
Video call · 30 min
What it testsCulture fit and role expectationsUsually run byFounder or hiring manager - 2
Technical Deep Dive
Video call or in-person · 60 min
What it testsPast projects and problem-solving approachUsually run byTechnical founder or lead - 3
Final Round
In-person or video · 45 min
What it testsTeam fit and offer discussionUsually run byFounding team
Rein Security take-home assignment
Rein Security includes a take-home exercise in their interview process. For AI roles, this typically involves a practical problem that takes 2-4 hours. Focus on clean, working code over premature optimization. They're evaluating how you think and communicate, not just the solution.
Rein Security interview timeline
At 7 days, Rein Security's process is faster than typical for AI (10 days at this size).
Interviewed at Rein Security?
Tell us how it went: stages, questions, timeline. Takes 90 seconds and it's how this page stays accurate for the next person.
Rein Security jobs, frequently asked questions
How many jobs does Rein Security have open?
Rein Security currently has 4 open roles, last verified October 9, 2026.
Does Rein Security hire remotely?
All current Rein Security roles are based in Tel Aviv, Israel & New York, USA.
What roles is Rein Security hiring for?
Rein Security is hiring across Engineering, Other, Sales. The most recent opening is Runtime / Sidecar Engineer (agent instrumentation, Tel Aviv).
How do I apply for a job at Rein Security?
Apply directly through the links above, or read our guide on how to actually get hired at Rein Security.
Does Rein Security respond to cold emails?
We're still collecting cold email data for Rein Security.
Who is the hiring manager at Rein Security?
At this size, hiring is usually run by a founder or department head.
How competitive is it to get hired at Rein Security?
<50-person AI companies see ~50-100 applicants per role in two weeks. The 72-hour window is your advantage.
How many rounds is the Rein Security interview?
3 stages: Intro Call, Technical Deep Dive, Final Round.
Is the Rein Security interview hard?
It concentrates on technical depth and system design rather than abstract puzzles. The stage candidates find hardest is Technical Interview.
Does Rein Security give a take-home task?
Yes, Rein Security includes a take-home assignment.
How long does Rein Security take to get back to you?
Around 7 days across the full process.
What should I prepare for the Rein Security interview?
Study technical depth and system design. At this size (<50), they care about self-sufficiency over textbook knowledge.
Where is Rein Security based?
Rein Security is headquartered in Tel Aviv, Israel & New York, USA.
Get Rein Security roles before they're posted
A role stays uncontested for about four days. Here's the window, and where we put you in it.
From $5.99/week, cancel any time.
- live
- +2h+2hrole spotted & verified1
- +4h+4hyou get the alert1
- day 3day 3you've applied~8
- day 7+day 7+hits the job boards250+
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