Senior Full-Stack Engineer - Browser Extension
LocationTel Aviv
Typefull-time
SenioritySenior
Experience5+ yrs
DepartmentR&D
Company size51–200 people
PostedSep 27, 2026 · 2w ago
Verified live19h ago
At a glanceSummarised by Seekless from the posting.
5+ years of professional software development experience
Expert TypeScript/JavaScript and deep knowledge of browser fundamentals
Production experience with Manifest V3, including service workers, content scripts, and extension messaging
Strong React experience
Backend experience building and operating APIs and services
Strong debugging skills with Chrome DevTools, extension internals, and network tooling
A security mindset
Experience building security products: DLP, SSE/SWG, enterprise browser
Familiarity with Chromium internals or browser source code
Cross-browser extension development (Firefox, Safari)
Skills
TypeScript
JavaScript
Chrome Extensions APIs
Manifest V3
Service Workers
Content Scripts
Native Messaging
React
Next.js
Node.js
Go
Postgres
EventBridge
SQS
S3
AWS Lambda
Pulumi
AWS
Chrome DevTools
About the Role
We’re looking for a Senior Full-Stack Engineer to join our engineering team.
You’ll work on our Chrome extension, a core part of our security platform that runs on managed endpoints across the enterprise and operates in the browser in real time.
You’ll own Neo’s policy enforcement engine in the browser, the layer that turns security policies into real-time decisions on every page users visit.
Additionally, you’ll also build features across our backend services and web app.
What You’ll Do
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Architect, build, and maintain our Chrome extension
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Own features from design through production monitoring.
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Debug hard problems across the browser, the OS, and the backend.
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Help shape the product’s technical direction and raise the bar on code quality, testing, and release practices.
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Build in-browser security capabilities: DOM inspection and manipulation, user-facing warning and blocking flows, and event capture.
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Keep the extension fast and invisible. Minimize page-load impact, memory footprint, and CPU usage on every site.
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Drive support for other Chromium browsers (Edge, Brave) and, over time, Firefox and Safari WebExtensions.
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Manage Chrome extension publishing, versioning, and staged rollouts.
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Build and extend the APIs and services that power the extension, including configuration delivery, real-time updates.
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Build features in our React/TypeScript web app that let customers configure the product, review events, and manage deployments.
Tech You’ll Work With
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Extension: TypeScript, Chrome Extensions APIs (Manifest V3, service workers, content scripts, native messaging)
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Frontend: React, Next.js
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Backend: [Node.js/TypeScript, Go, or similar], Postgres, EventBridge, SQS, S3, AWS Lambda, Pulumi
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Infrastructure: AWS
What You’ll Bring
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5+ years of professional software development experience in a relevant role
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Expert TypeScript/JavaScript and deep knowledge of browser fundamentals: DOM, event loop, cookies, storage, origins, CSP, and the extension security model.
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Production experience with Manifest V3, including service workers, content scripts, and extension messaging.
•
Strong React experience.
•
Backend experience building and operating APIs and services.
•
Strong debugging skills with Chrome DevTools, extension internals, and network tooling.
•
A security mindset. You think about how a malicious page or a curious user could break what you build.
Bonus:
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Experience building security products: DLP, SSE/SWG, enterprise browser.
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Familiarity with Chromium internals or browser source code.
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Cross-browser extension development (Firefox, Safari).