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Senior Mobile Developer

38 - 41 USDNet per hour - B2B
Mobile

Senior Mobile Developer

Mobile

-, Kraków

Infogain

Full-time
B2B
Senior
Hybrid
38 - 41 USD
Net per hour - B2B

Tech stack

    UX/UI

    regular

    Flutter

    regular

    Kotlin

    regular

    Java

    regular

    Swift

    regular

    SwiftUI

    regular

    RESTful API

    regular

    SQLite

    regular

    JWT

    regular

    GDPR

    regular

Job description

Project info:

We’re looking for a talented and motivated Mobile Developer from Kraków or nearby areas for a 3-month contract.

You will be working with large company from Airline industry helping them in building mobile solution for internal usage.


Responsibilities:

  • Design, develop, test, and deploy a high-quality mobile application for both iOS and Android platforms.

  • Build the app architecture from scratch ensuring scalability and performance.

  • Integrate backend services via APIs and ensure real-time data handling if needed.

  • Implement strong security measures (data encryption, secure authentication, etc.)

  • Set up analytics, crash reporting, and performance monitoring tools.

  • Collaborate with designers, backend developers, and stakeholders to align features with business requirements.

  • Ensure compliance with App Store and Google Play guidelines.

  • Optimize for performance, memory usage, and battery efficiency.


Job Requirements:

Mobile Development Frameworks

  • Flutter (preferred for cross-platform)

Native Development (optional but a plus)

  • Swift / SwiftUI (iOS)

  • Kotlin / Java (Android)

Backend / API Integration

  • RESTful APIs

Security

  • OAuth2 / OpenID Connect for authentication

  • JWT (JSON Web Tokens)

  • Secure data storage (Keychain, EncryptedSharedPreferences, etc.)

  • HTTPS and certificate pinning

  • Obfuscation & code minification

  • GDPR and data privacy compliance

Database

  • SQLite / Room (Android)

  • CoreData (iOS)

  • Firebase Firestore or Realtime DB

  • OR

  • PostgreSQL / MongoDB (via backend)

DevOps / Deployment

  • CI/CD tools: GitHub Actions, Bitrise, Codemagic

  • App Store / Google Play deployment

  • Version control: Git

Monitoring & Analytics

  • Crashlytics

  • Firebase Analytics / Mixpanel

  • Sentry (for error tracking)

Monitoring & Analytics

  • experience in deployment of applications on iOS and Android platforms is a must !

Qualifications

  • 3+ years of professional mobile development experience.

  • Proven track record of building apps from scratch and deploying to app stores.

  • Experience with scalable architecture and optimizing for large user bases (~10k+ users).

  • Solid understanding of mobile UI/UX best practices.

  • Strong understanding of mobile app security.

Must possess a legal work permit in Poland


Benefits:

General benefits - depends on the form of employment 

  • Attractively located office with collaboration spaces

  • Onsite parking space for employees 

  • Referral program with financial bonus 

  • Budget for development (including language courses and others), clear career path with the possibility to gain experience in international environment 

  • Access to internal Learning Platform with multiple trainings oriented for professional growth 

Lifestyle benefits: 

  • Access to MyBenefit platform (Multisport included) 

  • Team Building activities 

  • Charity initiatives 

  • Working environment promoting diversity and inclusion 

Published: 23.09.2025
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Senior Mobile Developer

38 - 41 USDNet per hour - B2B
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Senior Mobile Developer

-, Kraków

Infogain

38 - 41 USDNet per hour - B2B
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