Full Stack Engineer - Growth & Experimentation – Krak

kraken.com; United States; Remote; USD 120,000 - 180,000; Full time

Job summary

Kraken seeks an frontend-leaning full-stack engineer to build consumer-facing features for our mobile product. You’ll work with React Native and TypeScript, delivering rapid product changes and occasional backend work to run experiments from idea to launch.

Partner with Product, measure outcomes, and decide what to expand, revise, or stop based on evidence and impact.

Qualifications

• 3+ years shipping large-scale consumer apps with React/React Native.
• Proven growth experiments with measurable impact on metrics.
• Backend ability to design and implement services and APIs.
• Strong JavaScript/TypeScript fundamentals and real-time systems.
• Experience with A/B testing, feature flags, analytics, funnels.
• Product-minded, autonomous, able to navigate ambiguity.

Responsibilities

• Develop and ship small, high-velocity features in React Native and TypeScript.
• Own experiments end to end, from hypothesis to rollout and iteration.
• Improve onboarding, activation, and engagement through tested changes.
• Build acquisition and value-added features on existing product capabilities.
• Implement backend services and APIs to deliver experiments.

Skills

React

React Native

TypeScript

JavaScript

Tools

REST APIs

WebSockets

Rust (familiarity)

Job description

Role overview

Build and improve consumer-facing features for a mobile product, focusing on growth and experimentation. This frontend-leaning full-stack role uses React Native and TypeScript for rapid product changes, with enough backend work to carry experiments from idea to launch. You will partner closely with Product, measure outcomes, and decide what to expand, revise, or stop.

Responsibilities

• Develop and ship small, high-velocity features in React Native and TypeScript.
• Own experiments end to end, from hypothesis and implementation through rollout, measurement, and iteration.
• Improve onboarding, activation, feature discovery, engagement, and trading activity through tested product changes.
• Build acquisition and value-added features on top of existing product capabilities.
• Implement backend services and APIs as needed to deliver experiments without waiting on another team.
• Analyze test results and tradeoffs across conversion and other metrics, then make evidence-based decisions about next steps.

Requirements

• At least three years building and shipping large-scale consumer applications, with strong practical React and React Native experience.
• Demonstrated experience running consumer growth experiments with measurable effects on conversion, activation, retention, or revenue.
• Backend skills sufficient to design and implement services and APIs; openness to working with Rust is expected.
• Strong JavaScript or TypeScript fundamentals and experience with APIs, WebSockets or other real-time systems, mobile performance, and testing.
• Practical A/B testing experience, including feature flags, statistical significance, product analytics, and funnel or cohort analysis.
• Product-minded ownership and the ability to work autonomously amid ambiguity and changing priorities.

Nice to have

• Experience in fintech, digital banking, payments, trading, or crypto products.
• Familiarity with Statsig or a similar experimentation platform, Rust, SQL-based self-serve analysis, or AI-enabled development tools.
• Native iOS or Android development, distributed systems, or work in a high-scale consumer technology environment.