Principal Engineer – Client Platform (React Native)

Arcus Search; Lombardia; Hybrid; EUR 120,000 - 150,000; Full time

Job summary

Arcus Search partners with a global fintech client to hire a Principal Engineer to lead the Client Platform team focused on React Native and mobile architecture in Milan.

You will own core parts of the React Native platform, drive large-scale mobile initiatives, and improve tooling, CI/CD, performance, and developer experience across a broad app ecosystem. This is a permanent, on-site role with 3 days in Milan.

Qualifications

• Proven React Native experience required.
• Experience with large-scale mobile applications.
• Strong knowledge of JavaScript and TypeScript.

Responsibilities

• Own and evolve core parts of the React Native client platform.
• Lead large-scale technical initiatives across mobile platform and frontend infrastructure.
• Improve tooling, CI/CD pipelines, app architecture, scalability and developer experience.
• Collaborate with iOS & Android teams to ensure cross-platform consistency.
• Mentor engineers and promote technical best practices across teams.

Skills

React Native

JavaScript

TypeScript

RN internals

Frontend build tooling

CI/CD pipelines

Mobile apps

Collaboration with iOS/Android

AWS fundamentals

Tools

Babel

Metro

Webpack

AWS

Node.js

Express

Job description

Job title:

Principal Engineer – Client Platform (React Native) - Milan

Location:

Milan (3 days onsite)

Employment type:

Permanent

We’re currently partnering with a global fintech company looking for a Principal Engineer to join their Client Platform team with a strong focus on React Native and mobile platform architecture.

This role is focused on improving scalability, tooling, architecture, and CI/CD across a large mobile app ecosystem. You’ll work on core platform capabilities used across multiple teams, helping improve developer experience, performance, stability, and long-term maintainability.

Key responsibilities:

• Own and evolve core parts of the React Native client platform
• Lead large-scale technical initiatives across mobile platform and frontend infrastructure
• Improve tooling, CI/CD, app architecture, scalability, and developer experience
• Work closely with JavaScript/TypeScript, frontend build tooling, and native iOS/Android integrations
• Mentor engineers and help drive technical best practices across teams

Key skills:

• Strong React Native experience
• JavaScript & TypeScript
• React Native internals
• Frontend build tooling (Babel / Metro / Webpack)
• CI/CD pipelines
• Experience working on large-scale mobile applications
• Collaboration with iOS & Android teams
• Platform/infrastructure-focused mindset
• AWS fundamentals
• Node.js / Express exposure