Full Stack Engineer - Growth & Experimentation – Krak

As a Full Stack Engineer in Growth & Experimentation at Kraken, you join a small, dedicated team focused on accelerating acquisition, activation, engagement and trading activity across the Krak app. This is a frontend-leaning full-stack role where you own experiments end-to-end, from hypothesis through implementation, launch, measurement and iteration. You'll work closely with Product on a continuous pipeline of fast, lightweight experiments, finding the highest-leverage opportunities to grow users and revenue, proving what works, and scaling the winners with direct, measurable impact on how millions of customers discover and use Kraken's products.

What you'll do

• Build and ship consumer-facing features quickly in React Native and TypeScript, favouring small, high-velocity experiments over long-running projects.
• Own experiments end-to-end, including hypothesis, design, build, launch, measurement and iteration, using platforms such as Statsig to test globally or within specific markets.
• Improve onboarding, activation and feature discovery to drive conversion, engagement and trading revenue, iterating rapidly on features that are already live.
• Build viral acquisition features and value-add growth features on top of Krak's existing product offering.
• Contribute to backend services and APIs wherever an experiment requires it so you can ship across the stack without being blocked. The backend is primarily Rust; prior Rust experience is not expected, but enthusiasm for picking it up is.
• Read your own results, including trade-offs between conversion gains and other metrics, and decide whether to scale, iterate or kill, driving technical decisions autonomously amid evolving priorities and limited upfront planning.

What you bring

• 3+ years of software development experience building and shipping large-scale, consumer-facing applications. Strong, hands-on React and React Native experience is essential.
• Demonstrated experience running growth experiments at consumer-facing businesses, with measurable impact on conversion, activation, retention or revenue. This is a consumer growth role, so B2B or platform-only backgrounds are not a fit.
• Working backend proficiency: you can design and implement services and APIs yourself. Backend fundamentals matter more than any particular language, and you should be open to working in Rust.
• Strong JavaScript and TypeScript fundamentals, with hands-on experience across APIs, WebSockets and real-time systems, mobile performance, testing, and modern development workflows.
• Practical experience designing, running and analysing A/B tests, including feature flags, statistical significance, product analytics, funnel and cohort data, with the judgement to act decisively on what the results show.
• End-to-end ownership of product features and a strong product engineering mindset, with the initiative and adaptability to operate with minimal direction amid ambiguity and frequently changing priorities.

Nice to have

• Customer-facing product experience within fintech, digital banking, payments, trading or crypto.
• Hands-on experience with Statsig or a comparable experimentation platform, including regional and global rollouts.
• Rust experience, given the backend stack.
• SQL and self-serve analytics, so you can pull and interrogate your own data.
• AI fluency and familiarity with how AI tools and patterns have fundamentally shifted your development workflow and problem-solving approach.
• Native mobile development (iOS/Android), distributed systems or microservices, or engineering within a hyperscaling consumer technology organisation.

About Kraken

Founded in 2011, Kraken is one of the world's longest-standing crypto platforms, trusted by over 10 million individuals and institutions globally. The platform offers spot trading, margin, futures, staking and OTC services, with products built for both individual investors and institutional clients. Kraken is part of Payward, which operates a suite of financial infrastructure platforms including NinjaTrader, Breakout, xStocks, Payward Services and CF Benchmarks.