Middle/Senior React Native Developer

Sigma Software; Warszawa; On-site; PLN 120,000 - 180,000; Full time

Job summary

Sigma Software is seeking a Middle/Senior React Native Developer to join a fast-growing international project focused on mobile products used by millions of users worldwide. You will work with a distributed team to deliver high-quality iOS and Android apps with a product-oriented mindset.

You will collaborate with experienced engineers, contribute to architecture decisions, and help launch new brands while expanding into international markets, embracing ownership, collaboration, and engineering

Qualifications

• 3+ years of commercial React Native experience.
• Strong knowledge of React and React Native.
• Experience with TypeScript.
• Knowledge of GraphQL.
• Experience with GitHub or other version control systems.
• Understanding of mobile-first development principles.
• Experience working with iOS and Android applications.
• Upper-Intermediate level of English.

Responsibilities

• Develop and maintain React Native applications for iOS and Android platforms.
• Ensure smooth and engaging mobile user experiences.
• Collaborate with cross-functional teams to deliver high-quality solutions.
• Improve and maintain existing applications with a product-oriented mindset.
• Contribute to launching new brands and expanding products into new markets.
• Participate in technical discussions and suggest improvements across the development process.
• Take ownership of application quality, performance, and stability.

Skills

3+ years of React Native experience

React & React Native knowledge

TypeScript

GraphQL

GitHub / VCS

Mobile-first development

iOS & Android

Upper-Intermediate English

Job description

Company Description

Join a fast-growing international project where your work will impact mobile products used by millions of users worldwide. We are looking for a Middle/Senior React Native Developer with strong mobile expertise and a product-oriented mindset to strengthen our distributed team.

At Sigma Software, you will collaborate with experienced engineers to build scalable and high-performing applications for the iGaming domain.

Why join us? We offer the opportunity to work with modern technologies, influence product development decisions, and grow professionally in a collaborative engineering culture.

CUSTOMER

Our Customer is one of Europe’s largest GameTech companies and the owner of one of the biggest mobile gambling platforms with millions of active users worldwide. The company combines enterprise-scale products with a startup-like approach to innovation and product delivery.

PROJECT

You will join a team developing modern mobile applications for globally recognized iGaming brands. The project focuses on delivering high-quality user experiences, supporting new product launches, and expanding existing brands into new international markets. The team follows a mobile-first approach and values ownership, collaboration, and engineering excellence.

Job Description

• Develop and maintain React Native applications for iOS and Android platforms


• Ensure smooth and engaging mobile user experiences


• Collaborate with cross-functional teams to deliver high-quality solutions


• Improve and maintain existing applications with a product-oriented mindset


• Contribute to launching new brands and expanding products into new markets


• Participate in technical discussions and suggest improvements across the development process


• Take ownership of application quality, performance, and stability

Qualifications

• 3+ years of commercial experience with React Native development


• Strong knowledge of React and React Native


• Experience with TypeScript


• Knowledge of GraphQL


• Experience with GitHub or other version control systems


• Understanding of mobile-first development principles


• Experience working with iOS and Android applications


• Upper-Intermediate level of English

WILL BE A PLUS

• Experience writing unit tests


• Understanding of native mobile development


• Experience working in product-oriented teams


• Knowledge of CI/CD practices for mobile applications

Additional Information

PERSONAL PROFILE

• Strong ownership mindset


• Team-oriented approach to development


• Proactive communication skills


• Attention to detail and quality


• Ability to drive initiatives independently


• Willingness to learn and share knowledge