Bonsai Socials

Senior Frontend Engineer, Experimentation & Growth

Bonsai Socials

full-time

Posted on:

Location Type: Remote

Location: United States

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Job Level

Senior

Tech Stack

JavaScriptNext.jsReact

About the role

  • Partner closely with Business, Product, and Growth teams to translate hypotheses and requirements into quick, production-ready frontend releases
  • Build and iterate on small, targeted features using Optimizely experiments, feature flags, and personalization
  • Implement code-based Optimizely experiments within a modern frontend stack (React / Next.js)
  • Ensure experiments are clean, isolated, and reversible with minimal tech debt
  • Collaborate with Analytics to ensure accurate tracking, event instrumentation, and experiment measurement
  • Optimize for page performance, accessibility, and cross-browser compatibility
  • Support rapid testing cycles while maintaining high engineering standards
  • Debug, monitor, and quickly fix issues arising from experiments or releases

Requirements

  • 6+ years of experience as a Frontend Engineer in production environments
  • Strong expertise in React and modern JavaScript (ES6+)
  • Hands-on experience with Next.js or similar SSR / SPA frameworks
  • Direct experience working with Optimizely (Web Experimentation, Feature Flags, or Personalization)
  • Solid understanding of A/B testing concepts , experiment isolation, and rollout strategies
  • Experience collaborating directly with non-technical business stakeholders
  • Proficiency with HTML5, CSS3, responsive design, and modern styling approaches (CSS-in-JS, styled-components, etc.)
  • Familiarity with Git-based workflows and CI/CD pipelines
  • Experience with analytics tools (Google Analytics, Segment, or similar)
  • Understanding of performance monitoring and RUM tools
  • Experience working in high-traffic, consumer-facing applications
  • Exposure to feature flagging strategies beyond experimentation
Benefits
  • Great Place to Work® Certified
  • Rated Best Software Development Agency in New York City - Expertise (2021)
  • Rated Top Software Development Company - Clutch, New York (2020)
  • Rated Top Software Development Company - Clutch, New York (2019)
  • 60+ clients and 350+ projects
  • 250+ employees, and expanding quickly
  • A work environment that inspires people to collaborate and do great work on cutting edge technologies

Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard skills
ReactJavaScriptNext.jsOptimizelyHTML5CSS3A/B testingCSS-in-JSstyled-componentsperformance monitoring
Soft skills
collaborationcommunicationproblem-solvingdebuggingadaptabilityattention to detailstakeholder engagementrapid testingengineering standardsexperiment measurement