Senior React Native Developer

Job not on LinkedIn

🕒 June 3

🇵🇱 Poland – Remote

💵 zł21k - zł35k / month

⏰ Full Time

🟠 Senior

🖥 Software Engineer

👻 Ghost score 8%

What it means: how likely this posting is sitting open without active hiring.How to read it: 60% or higher means we think this is a ghost. Lower scores are less of a worry.How we score it: age, reposts, open roles vs team size, how fast jobs close, and whether pay is listed.Fine print: an estimate from public data, not a judgment of the company. Real jobs can score high, so treat it as a hint, not a fact.

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Callstack

WebsiteLinkedInAll Job Openings

51 - 200 employees

Founded 2016

💼 Consulting

📣 Marketing

Consulting • Marketing • Software Engineering

Callstack is a leading software engineering consultancy that specializes in app development and technological transformation using React and React Native. They provide end-to-end product development services including mobile and web app development, app performance optimization, and tech stack upgrades. Their expertise in the React ecosystem makes them a trusted partner for companies looking to enhance and innovate their software solutions. Callstack also focuses on educating and upskilling development teams, enabling organizations to stay competitive and efficient.

📋 Description

• Act as a technology consultant for our clients and help them build great products for multiple platforms • Drive the development process by providing expertise in cross-platform technologies and solving the most complex programming issues • Use AI-assisted development tools as a standard part of your engineering workflow to improve productivity, code quality, debugging, and technical decision-making • Collaborate with development teams, CTOs, Project Managers, and Product Owners from all around the world • Have multiple possibilities to contribute to the Open Source community by working on projects led by our CTO, React Native Core Contributors, and our Senior Developers • Be one step ahead, exploring technologies of tomorrow, and being a part of our R&D activities • Simply have fun!

🎯 Requirements

• A JavaScript expertise with extensive knowledge of modern frameworks and libraries • Experience in React.js and React Native • Strong commercial experience in mobile app development (above 3 years), experience in web development is a plus • AI-native mindset and practical familiarity with modern AI coding tools such as Codex, Claude Code, or Cursor, with the ability to use them effectively in daily software development work • Strong drive towards learning new technologies and knowledge-sharing initiatives • Ability to quickly gain new technical expertise • Fluency in English (min. B2+) • Passion about the open source mission (documented contributions to any open source project would be a huge plus) • Great communication skills and being a team player • Proactive and self-driven approach to work

🏖️ Benefits

• 24 paid days off & 30 days paid sick leave for B2B contractors • Fully-covered life insurance • Private healthcare for you and your family • Free access to mental health platform - Helping Hand • Multisport Card or monthly allowance for other sports activities • Individual Wellbeing & Development Budget • Monthly lunch allowance • Accounting costs refund for B2B contractors • Flexible working hours and fully remote work possibility • Cool office in Wrocław city center • Magnificent team events and activities • Company-wide workation and team building workshops • Top-notch hardware - Apple devices