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Kraken, one of the world's longest-standing crypto platforms trusted by over 10 million users, is seeking a Senior Full Stack Engineer to join its Growth & Experimentation team within Krak. This is a frontend-leaning full-stack role focused on accelerating user acquisition, activation, engagement, and trading activity across the Krak app.
You will work closely with Product on a continuous pipeline of fast, lightweight experiments, owning each one from hypothesis through implementation, launch, measurement, and iteration. The mandate is straightforward: find the highest-leverage opportunities to grow users and revenue, prove what works, and scale the winners with direct, measurable impact on how millions of customers discover and use Kraken's products.
Key responsibilities include:
- Build and ship consumer-facing features quickly in React Native and TypeScript, prioritizing small, high-velocity experiments over long-running projects.
- Own experiments end-to-end—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 live features.
- 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, enabling you to ship across the stack without being blocked. The backend is primarily Rust; prior Rust experience is not expected, but enthusiasm for learning it is valued.
- Read your own results, including trade-offs between conversion gains and other metrics, and decide autonomously whether to scale, iterate, or kill features—driving technical decisions amid evolving priorities and limited upfront planning.
Requirements:
- 6+ years of software development experience building and shipping large-scale, consumer-facing applications.
- Strong, hands-on React and React Native experience (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; B2B or platform-only backgrounds are not a fit.
- Working backend proficiency: ability to design and implement services and APIs yourself. Backend fundamentals matter more than any particular language; openness to working in Rust is required.
- Strong JavaScript/TypeScript fundamentals with hands-on experience across APIs, WebSockets, real-time systems, mobile performance, testing, and modern development workflows.
- Practical experience designing, running, and analyzing A/B tests—feature flags, statistical significance, product analytics, funnel and cohort data—with the judgment to act decisively on results.
- End-to-end ownership of product features and a strong product engineering mindset, with initiative and adaptability to operate with minimal direction amid ambiguity and frequently changing priorities.
Nice to haves:
- Customer-facing product experience within fintech, digital banking, payments, trading, or crypto.
- Hands-on experience with Statsig or comparable experimentation platforms, including regional and global rollouts.
- Rust experience.
- SQL and self-serve analytics capability.
- AI fluency and familiarity with how AI tools have shifted development workflow and problem-solving.
- Native mobile development (iOS/Android), distributed systems, microservices, or experience in hyperscaling consumer technology organizations.
