Full Stack Engineer - Growth & Experimentation – Krak

Brazil, Remote. Posted 7 days ago

The role

This Full Stack Engineer will join a growth and experimentation team to accelerate acquisition, activation, engagement, and trading activity on the Krak app. You will build and ship consumer-facing features using React Native and TypeScript while contributing to backend services in Rust.

What you will do

Build and ship consumer-facing features quickly in React Native and TypeScript.
Own experiments end-to-end from hypothesis to iteration using platforms like Statsig.
Improve onboarding, activation, and feature discovery to drive conversion and revenue.
Build viral acquisition features and value-add growth features.
Contribute to backend services and APIs in Rust.
Read and analyze experiment results to decide whether to scale, iterate, or kill features.

Required qualifications

3+ years of software development experience building and shipping large-scale, consumer-facing applications.
Strong, hands-on React and React Native experience.
Demonstrated experience running growth experiments at consumer-facing businesses.
Working backend proficiency to design and implement services and APIs.
Strong JavaScript/TypeScript fundamentals.
Experience with APIs, WebSockets, real-time systems, mobile performance, testing, and modern development workflows.
Practical experience designing, running and analysing A/B tests.
End-to-end ownership of product features and a strong product engineering mindset.

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.
Rust experience.
SQL and self-serve analytics.
AI fluency.
Native mobile development (iOS/Android).
Distributed systems or microservices.
Engineering within a hyperscaling consumer technology organisation.

Before you apply

We may ask candidates to complete job-related skills or work-style assessments as part of our hiring process.

About the company

Payward is the parent company behind Kraken, NinjaTrader, Breakout, xStocks, Payward Services and CF Benchmarks. Kraken is one of the world’s longest-standing crypto platforms, trusted by over 10 million individuals and institutions.