Full Stack Engineer, Growth

Triple Whale•New York City, NY

6d•Remote

About The Position

Triple Whale is seeking a Full Stack Engineer to own the in-product growth surface. The primary focus will be on building experiences that drive customer activation, feature adoption, and upgrades to higher-tier plans through self-serve flows. This includes owning upgrade prompts, gating experiences, onboarding flows, in-product messaging, trial mechanics, and feature discovery moments. The role also involves building and maintaining the experimentation infrastructure for A/B testing and rapid iteration. The engineer will collaborate closely with the product lead on Moby and cross-functionally with product, sales, CS, and marketing. The role is approximately 80% frontend and 20% backend, with backend tasks including API endpoints for experiment configuration, usage tracking, PQL scoring logic, and internal system integrations. Comfort with AI tools to accelerate work and building AI-integrated features is expected. The majority of the time will be dedicated to growth-specific work, with some contribution to core product as needed.

Requirements

2-4 years of professional full stack engineering experience with a frontend emphasis.
Primarily experienced in React with backend experience in Node.js, Python, or similar.
Experience building UI that sits in the critical path of user conversion or monetization (upgrade flows, checkout, onboarding, paywalls, or similar).
Hands-on experience with feature flagging and A/B testing infrastructure (e.g., LaunchDarkly, Statsig, Optimizely, or custom-built systems).
Comfort with analytics instrumentation and event tracking (e.g., Segment, Amplitude, Mixpanel, or similar).
Experience using AI tools (e.g., Cursor, Claude, Copilot) as a core part of the development workflow.
Ability to move fast and ship iteratively without sacrificing code quality in critical areas.
Strong collaboration skills, especially working closely with product and using data to inform development.
Strong understanding of the 'why' behind the work, focusing on metrics.

Nice To Haves

Experience building features that integrate AI/LLM capabilities (prompt design, API integration, streaming responses, or similar).
Experience at a product-led growth company or on a dedicated growth engineering team.
Familiarity with in-app messaging or onboarding tools (e.g., Appcues, Pendo, Intercom Product Tours, or custom equivalents).
Experience in ecommerce, marketing technology, or ad tech.

Responsibilities

Build frontend experiences for self-serve conversion, including upgrade modals, plan comparison views, usage limit messaging, gating experiences, and in-product CTAs.
Own the frontend side of the growth experimentation stack, implementing feature flags, building A/B test variants, and instrumenting events for analytics.
Build in-product experiences for customer activation and faster milestone achievement, such as guided flows, tooltips, checklists, contextual nudges, and feature education.
Ensure clean and reliable event tracking across growth surfaces for accurate measurement of activation, conversion, and feature adoption.
Contribute to core product work when priorities require it, ensuring consistency with the overall platform.
Build and maintain the experimentation infrastructure for A/B testing and rapid iteration.
Develop API endpoints for experiment configuration, usage tracking, PQL scoring logic, and integrations with internal systems.
Utilize AI tools to accelerate development workflow and build features incorporating AI capabilities.