Senior Frontend Engineer (Kotlin) — Platform & Mobile

Trading 212; Poland; On-site; PLN 180,000 - 280,000; Full time

Benefits offered by this job

Annual bonus

Private health insurance

Sports card

25 days paid vacation

Game room

Job summary

Trading 212 in Poland seeks an experienced frontend/mobile engineer to scale our platform and developer tooling. You will own the monorepo, build and refine CI/CD pipelines for React Native and web, and contribute to shared TypeScript libraries used across frontend products.

Ideal candidate has 4+ years in frontend or mobile engineering, strong TypeScript, React Native production experience, and Kotlin Android know-how.

Qualifications

• 4+ years of frontend or mobile engineering, with platform, infrastructure, or developer tooling focus.
• Strong typing discipline in TypeScript, production-grade quality.
• Hands-on React Native experience in production app, with native layer understanding.
• Practical Kotlin experience on Android—native modules, build config or Android CI/CD work.
• Direct involvement in CI/CD ownership or significant contribution—mobile or frontend tooling.
• Ability to think in systems and write code for other engineers, not just end users.
• Autonomous work style and decision-making without full consensus.

Responsibilities

• Own and evolve our monorepo, ensuring it stays healthy and fast as the codebase grows.
• Design, build, and maintain CI/CD pipelines for React Native and web targets.
• Author and maintain shared TypeScript libraries used across frontend products.
• Own the mobile release process end-to-end, including Android build config and deployment automation.
• Integrate observability tooling (Sentry, Amplitude) at the platform level.
• Identify and resolve build bottlenecks, dependency issues, and tooling gaps.
• Collaborate with product frontend teams to translate pain points into platform improvements.

Skills

TypeScript (production-grade)

React Native

Kotlin (Android)

CI/CD ownership

Systems thinking

Autonomy

Tools

nx

pnpm

Job description

Trading 212 in Poland seeks an experienced frontend/mobile engineer to scale our platform and developer tooling. You will own the monorepo, build and refine CI/CD pipelines for React Native and web, and contribute to shared TypeScript libraries used across frontend products.

Ideal candidate has 4+ years in frontend or mobile engineering, strong TypeScript, React Native production experience, and Kotlin Android know-how.