Senior Mobile Engineer ( React Native)

The company and our mission: 

Zartis is a digital solutions provider working across technology strategy, software engineering and product development.

We partner with firms across financial services, MedTech, media, logistics technology, renewable energy, EdTech, e-commerce, and more. Our engineering hubs in EMEA and LATAM are full of talented professionals delivering business success and digital improvement across application development, software architecture, CI/CD, business intelligence, QA automation, and new technology integrations.

We are looking for a Senior Mobile Engineer to work on a project in the fintech industry.

The project:

Our teammates are talented people that come from a variety of backgrounds. We’re committed to building an inclusive culture based on trust and innovation.

You will be part of a distributed team developing new technologies to solve real business problems. A React Native Developer builds and maintains high-quality, performant mobile applications for iOS and Android using the React Native framework. This role involves creating reusable components, managing application state, integrating with backend APIs, and delivering smooth mobile experiences. It may also involve contributing to internal or public SDKs and working with native modules when needed.

We are looking for someone with good communication skills, ideally with experience making decisions, being proactive, and with good attention to detail. 

What you will do:

- Develop and maintain scalable, reusable mobile components using React Native.

- Translate UI/UX designs into responsive, native-feeling mobile interfaces. 

- Manage application state using tools like Redux or Context API.

- Integrate mobile apps with backend APIs and handle data synchronization.

- Optimize mobile performance, responsiveness, and app launch times .Write clean, maintainable, and well-documented code following best practices.

- Participate in code reviews, testing and debugging.

- Contribute to the development of SDKs for internal or external use.

- Create or modify native modules when deeper integration with iOS/Android platforms is required.

What you will bring:

- You’re a mobile developer with proven experience building production-ready applications in React Native. 

- You care deeply about user experience, code quality, and performance, and you’re comfortable working across the stack when needed. 

- Solid experience with React Native and modern JavaScript (ES6+), with a strong understanding of component-based architecture and hooks. Experience managing mobile app state using Redux and Context API.

- Familiarity with integrating RESTful APIs and handling asynchronous data flows 

- Understanding of mobile platform-specific behaviours, performance optimizations, and best practices for both Android and iOS. 

- Ability to write clean, reusable, and well-documented code. 

- Experience with version control tools like Git and agile development workflows.

- Exposure to writing or maintaining native modules (Java/Kotlin for Android, Swift/Objective-C for iOS) is a plus.

- Familiarity with building and maintaining SDKs or shared libraries.

- Strong communication skills and a collaborative mindset, with a focus on continuous learning and team contribution.

What we offer: 

- 100%Remote Work

- WFH allowance: Monthly payment as financial support for remote working.

- Career Growth: We have established a career development program accessible for all employees with a 360º feedback that will help us to guide you in your career progression.

- Training: For Tech training at Zartis, you have time allocated during the week at your disposal. You can request from a variety of options, such as online courses (from Pluralsight and Educative.io, for example), English classes, books, conferences, and events.

- Mentoring Program: You can become a mentor in Zartis or you can receive mentorship, or both.

- Zartis Wellbeing Hub (Kara Connect): A platform that provides sessions with a range of specialists, including mental health professionals, nutritionists, physiotherapists, fitness coaches, and webinars with such professionals as well.

- Multicultural working environment: We organize tech events, webinars, parties, and activities to do online team-building games and contests.