Senior Frontend Engineer (Kotlin) - Frontend Core

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

Our mission is to enable everyone to build wealth

We reinvent how trading and investing work by creating exceptional products people love.

Fostering a culture of excellence and high velocity is the key to our success.

Today, we serve over 5 million clients, with more than €30 billion in assets under management - a testament to the scale and trust we’ve built in just a few years.

What you’ll do

• Own and evolve our monorepo, ensuring it stays healthy, performant, and easy to work in as the codebase grows
• Design, build, and maintain CI/CD pipelines for React Native and web targets, driving reliability and fast feedback loops for the engineering team
• Author and maintain shared TypeScript libraries — state management patterns, networking layers, error handling utilities — consumed across all frontend products
• Own the mobile release process end-to-end, including Android build configuration, versioning, and deployment automation
• Integrate and maintain observability tooling (Sentry, Amplitude) at the platform level, so product teams get reliable instrumentation out of the box
• Identify and resolve build bottlenecks, dependency issues, and tooling gaps that slow down engineering velocity
• Collaborate closely with product frontend teams to understand their pain points and translate them into platform improvements

What you need to have

• At least 4 years of professional experience in frontend or mobile engineering, with a meaningful portion spent on platform, infrastructure, or developer tooling work
• Production-grade TypeScript - strong typing discipline, not just familiarity
• Hands-on React Native experience in a production app, including an understanding of the native layer
• Practical Kotlin experience on Android - native modules, build configuration, or Android-side CI/CD work
• Direct involvement in CI/CD pipeline ownership or significant contribution — mobile or frontend, any tooling
• Ability to think in systems and write code for other engineers, not just end users
• Comfortable working autonomously and making decisions without waiting for full consensus

Nice to have (Optional)

• Hands-on experience with nx or pnpm workspaces specifically
• Familiarity with Vite and Expo for tooling or build configuration
• Exposure to Reanimated or React Native Gesture Handler
• Background in fintech or a high-scale consumer app where release reliability was business-critical

What we offer

• Challenges that will help you grow and realise your potential
• Opportunity to make a big Impact - you will build innovative services used by millions of investors to build wealth
• Work with smart, spirited, helpful, high-performing colleagues with a common goal
• An environment where nothing is set in stone
• Appreciation for your talent and ideas
• Generous remuneration package including annual bonuses
• Excellent social benefits package, including private health insurance, sports card and 25 days of paid vacation per year
• Delicious treats and a spacious game room

Bring your ambition to Europe’s fastest-growing mobile broker!