Javascript Engineer
C
ConfiantCybersecurity AdTech
All our team members work from home worldwideFull-TimeStaff
Salary140,000 - 220,000 USD per year
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Job Details
- Experience
- 6+ years for Engineer IV; 8+ years for Engineer V
- Required Skills
- Es6Javascript
Requirements
- Expert-level JavaScript (ES6+)
- Deep knowledge of browser internals (event loop, memory model, garbage collection, execution context)
- Understanding of JavaScript execution within third-party and sandboxed environments
- Proven experience building, shipping, and maintaining JavaScript SDKs or embeddable scripts at production scale
- Demonstrated ability to optimize for performance (bundle size, parse time, runtime efficiency, network impact)
- Experience with SDK distribution patterns (versioning, CDN delivery, backward compatibility)
- Proficiency with modern JavaScript tooling (Webpack, Rollup, esbuild, Babel, SWC, Jest, Playwright)
- Deep familiarity with browser security models (same-origin policy, CSP, cross-origin isolation)
Responsibilities
- Co-own the design, development, and ongoing maintenance of Confiant's client-side JavaScript SDK with your teammates
- Build and optimize SDK internals for maximum runtime performance
- Develop robust SDK versioning, deployment, and distribution strategies
- Translate security threat intelligence into SDK-level detection and blocking logic
- Instrument the SDK for observability
- Collaborate with the security research team to prototype new detection heuristics
- Conduct rigorous performance profiling, benchmarking, and regression testing
- Establish and champion SDK engineering best practices
- Debug complex, time-sensitive production issues occurring within live ad environments
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