Mobile Developer (Junior-Mid)

🏢 Summary: Senior Mobile Engineer role focused on designing and delivering high-quality, scalable mobile applications for both iOS and Android in an international project. The position involves contributing to architecture decisions, ensuring performance and security, and maintaining code quality through best practices and testing. 🗂️ Requirements: 7+ years of mobile development experience, Strong experience with iOS development using Swift, Strong experience with Android development using Kotlin, Solid understanding of MVVM or Clean Architecture, Experience integrating RESTful APIs, Knowledge of mobile performance, scalability, and security best practices, Experience working with Agile methodologies (Scrum or Kanban) 📃 Skills: Swift, Kotlin, iOS, Android, MVVM, CleanArchitecture, REST, Performance, Scalability, Security, Agile, Scrum, Kanban 🏢 Description: We are looking for a Senior Mobile Engineer with strong experience in both iOS (Swift) and Android (Kotlin) to join an international project focused on building high-quality mobile applications. Main Responsibilities: Design, develop, and maintain mobile applications for both iOS and Android platforms Contribute to the architecture and technical decisions of mobile solutions Build scalable, high-performance, and user-focused applications Collaborate closely with Product Managers, Designers, and other Engineers Ensure code quality through best practices, code reviews, and testing Troubleshoot, debug, and optimize application performance Key Requirements: 7+ years of experience in mobile development Strong hands-on experience with: iOS (Swift) Android (Kotlin) Solid understanding of mobile architectures (e.g., MVVM, Clean Architecture) Experience integrating RESTful APIs Knowledge of mobile performance, scalability, and security best practices Experience with Agile methodologies (Scrum/Kanban) Strong problem-solving skills and attention to detail Good communication skills in English Nice to Have: Experience with cross-platform solutions (e.g., Kotlin Multiplatform, Flutter, React Native) Familiarity with CI/CD pipelines for mobile applications Experience with automated testing (unit/UI) Knowledge of mobile app distribution processes (App Store / Google Play)

🏢 Summary: Opportunity for an experienced Mobile App Developer to build and enhance Android and cross-platform applications supporting digital identity and service delivery solutions. The role focuses on developing scalable, high-quality mobile products within an Agile, multidisciplinary team environment. 🗂️ Requirements: Several years of mobile development experience, Strong knowledge of Android development, Proficiency in Kotlin, Experience working in Agile teams, Ability to contribute to application architecture and performance improvements 📃 Skills: Android, Kotlin, ReactNative, Agile, Cloud 🏢 Description: We are looking for an experienced Mobile App Developer to join a global product team working on applications that support digital identity and service delivery solutions. The role involves developing and improving mobile applications, primarily on Android, as well as contributing to cross-platform solutions. You will collaborate with a multidisciplinary team in an Agile environment to build reliable, user-friendly, and scalable products. Key Responsibilities: Develop and maintain mobile applications Collaborate with designers, analysts, and developers Contribute to application architecture and performance improvements Ensure code quality and reliability Requirements: Several years of experience in mobile development Strong knowledge of Android development (Kotlin) Ability to work in a collaborative, Agile team Good communication skills Nice to Have: Experience with cross-platform technologies (e.g., React Native) Familiarity with modern development tools and cloud environments

🏢 Summary: Development role focused on building and maintaining cross-platform mobile applications using Flutter, with integration of native iOS and Android features. The position involves REST API integration, performance optimization, testing, CI/CD setup, and close collaboration with business and technical teams. It requires hands-on mobile development experience and strong understanding of design patterns and debugging. 🗂️ Requirements: BS/BA in Computer Science or equivalent experience, Proficiency in Flutter and Dart, 2+ years native iOS or Android development experience, Experience with Swift, Objective-C, Kotlin or Java, Knowledge of REST API integration, Knowledge of Flutter navigation and routing, Experience with unit and integration testing in Flutter, Experience with CI/CD tools, Knowledge of Git, Knowledge of Jira and Confluence, Understanding of design patterns, Strong debugging and problem-solving skills, Fluency in English 📃 Skills: Flutter, Dart, Swift, Objective-C, Kotlin, Java, REST, Jenkins, Git, Jira, Confluence, Angular, CICD, iOS, Android 🏢 Description: Responsibilities: Design, develop, and maintain cross-platform mobile applications written in Flutter Collaborate with teams to build native Android and iOS features Integrate with backend systems through RESTful APIs Optimize mobile applications for performance and responsiveness Debug, troubleshoot, and resolve technical issues Research new technology options and develop POCs for evaluation Collaborate with business teams to clarify requirements, understand application use case and business processes Requirements: BS/BA degree in Computer Science or related work experience Proficiency in Flutter/Dart 2 + years of experience with native development for iOS (Swift/Objective-C) or Android (Kotlin/Java) Fluency in English Good knowledge of the principles of creating mobile applications Familiarity with RESTful API integration Good knowledge of Flutter navigation and routing Familiarity with unit and integration testing in Flutter Experience creating and maintaining CI/CD tools like Jenkins Knowledge of tools such as Git, Jira, Confluence Deep understanding of design patterns Strong problem-solving and debugging skills Nice to have: Familiarity with app store deployment processes in Apple and Google marketplaces Knowledge and work experience with Angular framework and web development Offer: Private medical care (dental care + vision care plan) Life insurance Sports card Training & learning opportunities Language course co-financing Annual bonus Employee referral program

🏢 Summary: Development and large-scale delivery of Android applications for B2B and B2C clients, with responsibility for architecture, quality, and production maintenance. The role involves designing mobile-to-backend integrations, applying modern architectural patterns, and supporting CI/CD and monitoring processes. You will contribute to feature scoping, performance optimization, and continuous improvement of Android solutions. 🗂️ Requirements: Minimum 4 years commercial experience in Android development, Degree in Computer Science, Software Engineering or related field, Strong knowledge of software engineering principles, testing, data structures and algorithms, Hands-on experience designing mobile and backend architectures, Experience with MVI and TCA architectural patterns, Experience with REST or GraphQL APIs, Strong experience with CI/CD processes, Knowledge of OOP, SOLID principles and Clean Code, Experience with dependency injection and multithreading, Experience working in Agile methodologies (SCRUM or Kanban) 📃 Skills: Kotlin, Android, REST, GraphQL, CI/CD, MVI, TCA, OOP, SOLID, CleanCode, DependencyInjection, Threading, Scrum, Kanban, DataStructures, Algorithms 🏢 Description: About the role We are seeking candidates for our client, which operates in Europe. You will be a member of a team responsible for the development and delivery of mobile Android apps. A strong hands-on experience in delivering Android apps to customers on a large scale, supported with CI/CD processes and production monitoring, is a requirement. Technologies we work with: Kotlin, Android, AWS, Typescript, JavaScript, Node.js, REST/GraphQL APIs. Responsibilities Development and delivery of Android apps for B2B and B2C clients Design software architecture between mobile apps and systems that they connect with Follow and improve the concepts of dependency injection and threading inside apps Scoping and assessing the complexity of features Continuously improve the quality and performance of mobile apps Maintaining apps on production used by consumers from several European countries Monitor and create prototypes for new technological opportunities (E.g., WearOS) Participating in sprint planning, daily sprints and meetings with product owners for grooming new features Recruiting new team members Collaborating with other team members and teams that depend on the functionalities that you develop Required qualifications Minimum of 4 years commercial work experience in building Android apps Bachelor's or higher degree in Computer Science, Software Engineering, or a related field Strong understanding of software engineering principles, testing, data structures and algorithms Solid hands-on experience in solving architectural problems for mobile apps and backend services Fluency in architecture and patterns: MVI, TCA, REST/GraphQL APIs Strong hands-on experience of CI&CD processes Understanding of OO design patterns, dependency injection, SOLID principles and Clean Code Able to work with Agile methodologies such as SCRUM and/or Kanban Good communication and collaboration skills Team player and a leading by example approach Self-motivation, proactive attitude Proficiency in English, it’s our daily business language Nice to have Experience in developing Cloud and Infrastructure solutions with AWS and CI/CD processes supported by tools like Docker, Kubernetes, Jenkins, Terraform, CircleCI, GitlabCI, Datadog, etc. Working experience with one of the object-oriented and/or functional languages such as Elixir, C++, C#, Golang, Erlang, Python, Kotlin, Node.js

🏢 Summary: The role involves developing and delivering large-scale Android applications for B2B and B2C clients across Europe, with full ownership from architecture design to production support. The position focuses on building high-quality mobile solutions integrated with backend systems and supported by CI/CD and monitoring processes. You will work on improving app performance, architecture, and scalability within an Agile environment. 🗂️ Requirements: Minimum 3 years commercial experience in Android development, Bachelor’s degree in Computer Science, Software Engineering or related field, Experience delivering Android apps at scale, Strong knowledge of software engineering principles, data structures and algorithms, Hands-on experience designing mobile and backend architecture, Experience with TCA architecture, Knowledge of MVI architecture, Experience with REST APIs, Hands-on experience with CI/CD processes, Understanding of OOP, SOLID and Clean Code principles, Experience with dependency injection and threading in Android, Experience working in Agile (SCRUM or Kanban), English proficiency 📃 Skills: Kotlin, Android, AWS, TypeScript, JavaScript, Node.js, REST, TCA, MVI, CI/CD, OOP, SOLID, CleanCode, SCRUM, Kanban 🏢 Description: About the role We are seeking candidates for our client, which operates in Europe. You will be a member of a team responsible for the development and delivery of mobile Android apps. Hands-on experience in delivering Android apps to customers on a large scale, supported with CI/CD processes and production monitoring, is a requirement. Technologies we work with: Kotlin, Android, AWS, Typescript, JavaScript, Node.js, REST APIs. Responsibilities: Development and delivery of Android apps for B2B and B2C clients Design software architecture between mobile apps and systems that they connect with Follow and improve the concepts of dependency injection and threading inside apps Scoping and assessing the complexity of features Continuously improve the quality and performance of mobile apps Maintaining apps on production used by consumers from several European countries Monitor and create prototypes for new technological opportunities (E.g., WearOS) Participating in sprint planning, daily sprints and meetings with product owners for grooming new features Collaborating with other team members and teams that depend on the functionalities that you develop Required qualifications: Minimum of 3 years commercial work experience in building Android apps Bachelor's or higher degree in Computer Science, Software Engineering, or a related field Strong understanding of software engineering principles, testing, data structures and algorithms Solid hands-on experience in solving architectural problems for mobile apps and backend services Experience with TCA architecture Fluency in other architecture and patterns: MVI, REST APIs Strong hands-on experience of CI&CD processes Understanding of OO design patterns, dependency injection, SOLID principles and Clean Code Able to work with Agile methodologies such as SCRUM and/or Kanban Good communication and collaboration skills Team player Self-motivation, proactive attitude Proficiency in English, it’s our daily business language Nice to have: Experience in developing Cloud and Infrastructure solutions with AWS and CI/CD processes supported by tools like Docker, Kubernetes, Jenkins, Terraform, CircleCI, GitlabCI, Datadog, etc. Working experience with one of the object-oriented and/or functional languages such as Elixir, C++, C#, Golang, Erlang, Python, Kotlin, Node.js

🏢 Summary: Senior iOS Developer role focused on designing and implementing advanced mobile applications across healthcare, banking, media, and other industries. The position involves building new features in Swift, maintaining CI/CD pipelines, ensuring code quality, and collaborating on scalable architectures. The offer includes personalized project matching, professional development plans, and dedicated training support. 🗂️ Requirements: Minimum 5 years of experience in iOS mobile application development, Expertise in Swift and Xcode, Proficiency with SwiftUI, UIKit, CocoaPods, SPM or Carthage, Knowledge of Clean Swift, MVVM and MVC architectural patterns, Understanding of UI design patterns and principles, Advanced spoken and written English, Fluent Polish, Residence in Poland 📃 Skills: Swift, Xcode, SwiftUI, UIKit, CocoaPods, SPM, Carthage, CI/CD, CleanSwift, MVVM, MVC, iOS 🏢 Description: As our employee, you will have the opportunity to be part of our community of over 80 Mobile Technology Developers. Our experts are working on a wide range of projects in industries such as healthcare (e.g., the creation of apps to support the lives of citizens), banking (banking apps for individual and corporate customers), media (mobile apps for the presentation of news), loyalty, and many more! To learn the latest technologies, our Mobile Engineers create internal projects for their own development. They have a personalized training offer and an internal development plan (e-training, book publications, dedicated access to training platforms), a training budget, and the support of a mentor. Our candidates receive a personalized offer that matches their career plan and preferences, with many different projects to choose from. Your tasks Designing and implementing mobile applications for the iOS platform Creating new functionalities in Swift Maintaining and developing CI/CD systems in the project Collaborating with other team members to design new functionalities Taking care of the code quality Testing the developed functionalities Creating project documentation in accordance with applicable standards Requirements At least 5 years of experience in mobile application development for the iOS platform Expertise in Swift and Xcode Proficiency with SwiftUI, UIKit, CocoaPods / SPM / Carthage Knowledge of architectural patterns: Clean Swift, MVVM, MVC Familiarity with user interface design patterns and principles An advanced level of spoken and written English Fluent Polish required Residing in Poland required What we offer Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more Comfortable workplace – class A offices or remote work Dozens of fascinating projects for prestigious brands from all over the world PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers Investment in your growth – meetups, webinars, training platform and technology blog – you choose Fantastic atmosphere created by all Sii Power People If you want to work on systems with high operational significance — apply now!

🏢 Summary: Opportunity for a Senior iOS Developer to design and build mobile applications across various domains, implementing new features in Swift and maintaining CI/CD pipelines. The role focuses on high-quality code, architectural best practices, testing, and collaboration within a mobile engineering team. 🗂️ Requirements: Minimum 5 years of experience in iOS mobile application development, Strong expertise in Swift and Xcode, Proficiency in SwiftUI and UIKit, Experience with dependency managers: CocoaPods, SPM or Carthage, Knowledge of architectural patterns: Clean Swift, MVVM, MVC, Experience with CI/CD systems, Understanding of UI design patterns and principles, Experience in testing and maintaining code quality 📃 Skills: iOS, Swift, Xcode, SwiftUI, UIKit, CocoaPods, SPM, Carthage, CleanSwift, MVVM, MVC, CICD 🏢 Description: As our employee, you will have the opportunity to be part of our community of over 80 Mobile Technology Developers. Our experts are working on a wide range of projects in industries such as healthcare (e.g., the creation of apps to support the lives of citizens), banking (banking apps for individual and corporate customers), media (mobile apps for the presentation of news), loyalty, and many more! To learn the latest technologies, our Mobile Engineers create internal projects for their own development. They have a personalized training offer and an internal development plan (e-training, book publications, dedicated access to training platforms), a training budget, and the support of a mentor. Our candidates receive a personalized offer that matches their career plan and preferences, with many different projects to choose from. Your tasks Designing and implementing mobile applications for the iOS platform Creating new functionalities in Swift Maintaining and developing CI/CD systems in the project Collaborating with other team members to design new functionalities Taking care of the code quality Testing the developed functionalities Creating project documentation in accordance with applicable standards Requirements At least 5 years of experience in mobile application development for the iOS platform Expertise in Swift and Xcode Proficiency with SwiftUI, UIKit, CocoaPods / SPM / Carthage Knowledge of architectural patterns: Clean Swift, MVVM, MVC Familiarity with user interface design patterns and principles An advanced level of spoken and written English Fluent Polish required Residing in Poland required

🏢 Summary: Long-term remote contract for an experienced Native Mobile Developer working with SwiftUI and Kotlin, starting October 1, 2026. The role requires a minimum 4 days per week commitment with occasional onsite presence in Hamburg. The offer includes a B2B contract with competitive hourly rate and collaboration in an international environment. 🗂️ Requirements: Practical experience with SwiftUI, Practical experience with Kotlin, Minimum 4 working days per week availability, German language proficiency at minimum B2 level, English language proficiency at B2/C1 level, Availability for occasional onsite meetings in Hamburg 📃 Skills: SwiftUI, Kotlin, iOS, Android 🏢 Description: Join a long-term enterprise development team as a Senior Native Mobile Engineer to build, scale, and optimize core mobile applications. This role requires an engineer capable of working cross-platform across native environments using SwiftUI for iOS and Kotlin for Android. You will play a central role in delivering smooth user experiences, maintaining high code quality, and aligning directly with team leads and client stakeholders based in Germany. Details Start Date: October 1, 2026. Duration: Long-term project (contracts renewed in stable 3-month cycles). Allocation: 0.75 FTE / 1 FTE Rate: 160-200 PLN net / hour. Work Model: 100% Remote (with occasional meetings on-site at the client’s office in Hamburg). Language Requirement: German at a minimum B2 level (C1 preferred) for daily engineering and business communication. Responsibilities Native Development: Design, build, and maintain robust native mobile applications using SwiftUI (iOS) and Kotlin (Android). Clean Architecture: Write clean, modular, and easily testable code while implementing modern mobile architecture patterns (e.g., MVVM, MVI). API Integration: Connect mobile frontends with secure backend RESTful APIs and real-time data streams. UI/UX Excellence: Implement fluid animations, responsive layouts, and modern components according to design specifications. Performance Tuning: Monitor, debug, and optimize application rendering speeds, memory usage, and battery consumption profiles. Requirements Native Platform Mastery: Strong commercial track record in native iOS development ( Swift / SwiftUI ) and native Android development ( Kotlin ). Ecosystem Knowledge: Solid understanding of platform-specific deployment workflows, App Store Connect, and Google Play Console environments. Software Engineering Principles: Experience with Git workflows, automated testing frameworks, and continuous integration (CI/CD) pipelines for mobile. Soft Skills: Highly autonomous mindset, comfortable aligning directly with international clients, and strong team-player capabilities.

🏢 Summary: 6-month hybrid contract for an experienced Android Developer to design, build, and maintain high-performance Android applications within a collaborative team. The role focuses on developing new features, integrating APIs, optimizing performance, and ensuring code quality through best practices and reviews. Opportunity to contribute to impactful mobile projects with potential extension. 🗂️ Requirements: Minimum 5 years of Android development experience, Proficiency in Java, Proficiency in Kotlin, Experience with RESTful APIs, Experience with third-party libraries, Solid understanding of full mobile development life cycle, Knowledge of modern design patterns, Ability to design and develop high-performance Android applications, Experience in debugging and performance optimization 📃 Skills: Android, Java, Kotlin, REST, APIs, Libraries, DesignPatterns, MobileLifecycle 🏢 Description: We are seeking an experienced Android Developer with at least 5 years of experience in mobile application development. The ideal candidate will possess a strong background in building high-quality Android applications and have a solid understanding of the mobile ecosystem. This role offers an opportunity to contribute to exciting projects and further enhance your skills within a collaborative team environment. Bonus: Able to work during summer-time. Start: ASAP Length: 6 months with possible extension Location: Hybrid in Stockholm (must be located in Stockholm area) Main Responsibilities: As an Android Developer, your primary duties will include: Designing and developing high-performance Android applications. Collaborating with cross-functional teams to define and design new features. Ensuring the performance, quality, and responsiveness of applications. Identifying and fixing bugs to maintain an efficient system. Continuously discovering, evaluating, and implementing new technologies to maximize development efficiency. Participating in code reviews to ensure adherence to best practices. Maintaining up-to-date knowledge of mobile development trends. Key Requirements: Minimum 5 years of experience in Android development. Proficient in Java/Kotlin programming languages. Experience with RESTful APIs and third-party libraries. Solid understanding of the full mobile development life cycle. Familiarity with modern design patterns and best practices. Ability to work in a team-oriented environment. Strong problem-solving skills and attention to detail.

🏢 Summary: Freelance Mobile Applications Developer role focused on building high-performance Flutter-based applications for a solar industry SaaS platform. The position involves developing mission-critical, low-latency mobile solutions that process large-scale data and deliver outstanding user experience. The project runs until the end of 2026 with potential extension. 🗂️ Requirements: Extensive experience in mobile application development, Experience developing mobile applications using Flutter, 5+ years of Native Android development experience (Java or Kotlin), Strong understanding of object-oriented design principles, Experience working with AI-based development tools, Ability to build adaptive, user-friendly mobile UIs, Ability to write clean, testable, and efficient code, Experience optimizing application performance and scalability 📃 Skills: Flutter, Android, Java, Kotlin, OOP, AI, SaaS 🏢 Description: Project description: We are looking for a top-tier Mobile Applications Developer to join our team and help us build cutting-edge software solutions for the Solar Industry. Our platform focuses on designing and monitoring solar fields, processing large-scale data in a SaaS environment, ensuring fast response times, and delivering an outstanding user experience. If you are a passionate Flutter developer who cares deeply about user experience, intuitive interactions, and modern app design, and you are ready to take on the challenge of building high-quality, mission-critical mobile applications, this role is for you. Requirements: Extensive experience in mobile application development Experience in developing mobile applications using Flutter 5+ years of experience in Native Android development (Java / Kotlin) Strong understanding of object-oriented design principles and concepts Experience working with AI-based development tools Proven ability to build adaptive, user-friendly, and flexible mobile UIs Team player with excellent communication skills Passion for high-quality code, performance optimization, and intuitive user experiences Main responsibilities: Design and develop high-volume, low-latency mobile applications for mission-critical systems, ensuring high availability and top performance Contribute to all phases of the software development lifecycle Write clean, well-designed, testable, and efficient code Prepare and deliver software component releases Collaborate closely with cross-functional teams to ensure seamless integration and optimal user experience Continuously improve application performance, usability, and scalability This is a freelance, project-based engagement with no additional benefits, offering the opportunity to work on a clearly defined initiative scheduled to run until the end of 2026, with a possibility of extension depending on project needs and performance.