Javascript Engineer – IV-V

🕒 June 2

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Confiant Inc

WebsiteLinkedInAll Job Openings

51 - 200 employees

Founded 2013

🔒 Cybersecurity

☁️ SaaS

📱 Media

Cybersecurity • SaaS • Media

Confiant Inc. is an online ad security and quality SaaS provider that detects and blocks malvertising and malicious ads, protecting publishers, platforms, and brands from ad-based attacks. The company monitors client- and server-side impressions at scale, provides real-time detection and contextual alerts, and emphasizes low false positives, broad ad-tech coverage, and actionable intelligence to preserve revenue and trust.

📋 Description

• 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

🎯 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