Joko

Mobile Software Engineer (senior/staff level)

Joko
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8 months ago
Paris, France or Barcelona, SpainSenior / Staff+

Responsibilities

  • Own meaningful parts of the production mobile application from technical design through delivery and continuous improvement.
  • Define and evolve React Native architecture and develop, refactor, and maintain scalable mobile features.
  • Modernize the existing React Native codebase using modern patterns, best practices, and platform capabilities.
  • Measure, profile, and optimize startup time, rendering, memory, caching, and overall mobile user experience.
  • Improve mobile tooling, build systems, debugging workflows, automation, and developer productivity.
  • Provide React Native technical expertise through design and code reviews and drive better production solutions.
  • Maintain and improve mobile testing strategies, release processes, and CI/CD pipelines for iOS and Android.
  • Collaborate with backend teams to design and integrate APIs and data flows and occasionally improve backend code for mobile needs.
  • Participate in technical discussions, review code, mentor colleagues, and raise mobile engineering standards.
  • Collaborate with Product Managers and Product Designers to deliver high-quality mobile experiences.

Requirements

  • 5+ years of mobile development experience.
  • Clear expertise in React Native and deep understanding of mobile architectures and performance tradeoffs.
  • Experience operating at a senior or staff level and owning meaningful parts of a production application end to end.
  • Experience building reliable, data-driven applications in production.
  • Strong product mindset and sensitivity to user experience, performance metrics, and real-world usage at scale.
  • Comfort working in complex, evolving codebases and improving them incrementally.
  • Experience with mobile CI/CD, release processes, testing, and iOS and Android platform-specific constraints.
  • Ability to collaborate effectively with engineering, Product Managers, and Product Designers.
  • Fluent written and spoken English; French is not required.

Benefits

  • Flexible remote work in France and Spain, with office or home working options in Paris and coworking access and budget elsewhere.
  • Ability to work from most countries for up to 3 months per year.
  • Equity for everyone.
  • Half a day each week dedicated to learning and experimenting with AI tools.
  • Yearly offsite, team-building budget, and monthly in-person gatherings.
  • Contribution toward a ClassPass subscription.
  • Eight weeks of fully paid leave for the second parent.

Tech Stack

iOSReact Native

Categories

Mobile
Joko

About Joko

201-500 employees
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