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Jobs via Dice · 15 hours ago

Senior Front End Engineer

San Francisco, CA

Full-time

Hybrid

Senior Level

$160K/yr - $200K/yr

Ketch is a Series B, well-funded startup focused on developing first-in-class innovation around data management and privacy. The Senior Front End Engineer will own the SDK runtime, ensuring high performance and reliability while integrating with various platforms to manage user data consent and events at scale.

Computer Software

No H1B

Responsibilities

Design and evolve the core Ketch SDK runtime for consent orchestration, event tracking, rule evaluation, and platform integration at massive scale

Optimize SDK performance under impossible constraints and enforce deterministic client-side data governance across 50+ browsers/OS combinations, intercepting and managing network requests, cookies, and storage

Build APIs and tooling for thousands of engineers, making complex integrations simple, secure, and impossible to misuse

Extend SDKs for custom integrations, multi-platform routing, adtech connectivity, and AI-driven privacy telemetry

Simulate real-world network interactions with emulators and pipelines that feed AI models for privacy risk detection

Collaborate across product, design, and customer success, mentor engineers, and drive architectural excellence across the frontend team

Qualification

TypeScriptReactSDK developmentJavaScriptAWSPerformance optimizationMobile SDKsCollaborationMentorshipFast-paced environment

Required

Deep expertise in JavaScript & TypeScript (ES6+), browser APIs, event loops, closures, and high-performance client-side coding across diverse runtime environments

Proven experience building SDKs and JavaScript tags deployed on customer websites, integrating with internal and external platforms under production pressure

Mastery of browser architecture and client-side systems: rendering pipeline, network stack, storage APIs, cross-origin communication, and deterministic data flow governance

Performance and reliability wizardry: profiling, benchmarking, optimizing, and debugging async race conditions across distributed client-side systems

Systems thinking and build tooling experience: Webpack, Rollup, ESBuild, ESM/CommonJS/UMD, polyfills, and managing browser inconsistencies or third-party script conflicts

Collaboration, mentorship, and product-minded ownership: articulate technical decisions, influence stakeholders, drive pragmatic solutions, and elevate teams through code reviews and knowledge sharing

Excellent communication skills, dynamic personality

Ability to work in a fast-paced start-up environment

Recent/extensive experience in permanent roles to ensure long-term stability and commitment

Must be authorized to work in the United States without sponsorship