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Software Development Engineer II (RUX)

Krakow, Poland💼 Full-time💰 $245,000–$275,000🗓 2026-05-22 → 2026-07-31

Core

Design and implement large-scale web and mobile architectures for money-movement experiences, integrating local payment systems and identity verification services to enable new markets and protect against fraud.

Role type

Senior IC Software Development Engineer (Backend/Frontend)

Builds

Scalable, compliant money-movement platforms for global customers

Domain

Fintech / Cross-border payments

Deliverable

production ML models | product features | infrastructure

Required skills

Java, Kotlin, Golang, React, Next.js, SDLC management, large-scale web architecture design, performance optimization (page speed, core web vitals), fraud prevention system design

Preferred skills

React Native, native app development, modern JavaScript bundlers (Webpack, Vite, Esbuild), close collaboration with Product teams

Technologies

Java, Kotlin, Golang, React, Next.js, Webpack, Vite, Esbuild

Responsibilities

Design and implement large-scale web and mobile architectures; Write integrations with local payment systems and Identity verification services; Optimize page speed and core web vitals; Build systems to keep fraudsters off the platform; Own features with real customer impact; Participate in on-call rotation

Seniority

Mid-Senior, hands-on IC

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