Confiant is a cybersecurity company founded in 2013 that protects publishers and their audiences from malicious ads and threats to digital advertising ecosystem
Javascript Engineer – IV-V
Location
Worldwide
Posted
9 days ago
Salary
$140K - $220K / year
Seniority
Senior
Job Description
Javascript Engineer – IV-V
Confiant
• 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 — minimizing execution time, memory footprint, and impact on page load across diverse publisher environments • Develop robust SDK versioning, deployment, and distribution strategies that allow seamless rollouts and updates across a large, heterogeneous customer base • Translate security threat intelligence (e.g., new malvertising techniques, ad injection patterns) into SDK-level detection and blocking logic • Instrument the SDK for observability — ensuring signals, errors, and detection events are surfaced reliably back to Confiant's backend systems • Collaborate with the security research team to stay ahead of evolving malvertiser methods and rapidly prototype new detection heuristics • Conduct rigorous performance profiling, benchmarking, and regression testing to ensure SDK changes never degrade customer experience • Establish and champion SDK engineering best practices including testing strategies, documentation standards, and release processes • Debug complex, time-sensitive production issues occurring within live ad environments across a wide range of browsers and platforms
Job Requirements
- Expert-level JavaScript (ES6+) with deep knowledge of browser internals — the event loop, memory model, garbage collection, and execution context
- Strong understanding of how JavaScript executes within third-party and sandboxed environments (iframes, ad slots, cross-origin contexts)
- 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, and network impact
- Experience with SDK distribution patterns — versioning strategies, CDN delivery, backward compatibility, and graceful degradation
- Proficiency with modern JavaScript tooling: bundlers (Webpack, Rollup, esbuild), transpilers (Babel/SWC), and testing frameworks (Jest, Playwright, or similar)
- Deep familiarity with browser security models, including same-origin policy, CSP, and cross-origin isolation
Benefits
- Fully Remote
- Unlimited Paid Time Off
- Sabbatical
- Stock Option Plan
- Exceptional Health Care Plans (Medical, Dental & Vision)
- FSA & Commuter Benefits
- Employee Sponsored Disability & Life Insurance
- 401(k) Plan with Automatic Employer Contribution
- Enhanced and Extended Family Leave
- Learning & Development Budget
- Yearly Office Supply Stipend
- Free Global Co-Working Membership
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