Senior Android Engineer | Kotlin Expert | Join Saily

Saily, part of nordsec, helps travelers connect worldwide without roaming fees or plastic SIM cards. The service delivers fast, secure mobile data in more than 200 locations and supports millions of paying users, including hundreds of thousands of travelers at any given time. The team values an AI-native product engineering approach. Engineers at Saily take responsibility for the full product lifecycle, from early ideas through deployment. AI agents handle repetitive work, freeing engineers to focus on solving customer problems and building new features. How the team works Engineers design and deliver solutions to real customer challenges, owning projects from start to finish. AI tools automate routine tasks, letting the team work more effectively. Everyone can suggest and implement improvements to the platform. Continuous learning, curiosity, and sharing knowledge are core values. The main goal is to provide travelers with a smooth, reliable connection wherever they go. Culture and values Growth is valued over comfort. Contribution matters more than hierarchy. Impact takes priority over rigid processes. Team members receive the context, autonomy, and AI tools needed to excel.

Saily, part of Nord Security, is looking for a Senior Android Engineer with strong Kotlin skills to help shape and improve our mobile applications. This role centers on building new features and refining app performance for a better user experience. What you will do Design and implement features for Android applications using Kotlin Work closely with cross-functional teams to deliver high-quality solutions Troubleshoot and resolve technical issues as they arise Maintain high coding standards throughout the development process Requirements Extensive experience in Android development Proficiency with Kotlin Strong problem-solving skills and attention to detail Comfort working collaboratively with diverse teams This position is based in Warsaw and offers the chance to work on challenging projects in a collaborative setting.

Join our dynamic team at Saily as a Senior Android Engineer, where you will lead the development of innovative mobile applications using Kotlin. Collaborate with a talented group of engineers and designers to create seamless user experiences, ensuring high performance and responsiveness of our applications.

Are you a talented Mobile Engineer skilled in iOS and Android development? Join our dynamic team at Saily, a leading tech company, where you will play a key role in shaping our mobile applications. We are looking for a passionate and innovative Senior Mobile Engineer to contribute to our exciting projects and help us deliver top-notch mobile solutions.Your expertise in mobile technologies will be crucial as you collaborate with cross-functional teams to design, develop, and maintain high-quality mobile applications. If you are eager to make a significant impact and thrive in a fast-paced environment, we want to hear from you!

Join Our Innovative TeamAt SumUp, we are dedicated to transforming the way businesses operate through our cutting-edge Point-of-Sale (POS) solutions. Our platform empowers a diverse range of businesses, from cafes and bars to retail shops and salons, providing them with essential tools to enhance their operational efficiency and drive growth.Our POS system seamlessly integrates into the SumUp SuperApp, compatible with both our proprietary hardware and mobile devices, making it versatile and user-friendly.As a Senior Android Developer, you will work alongside a dynamic, multidisciplinary team, including Product Managers, Designers, Engineering Managers, and other talented engineers, to deliver exceptional mobile applications.Your RoleWe are transitioning to a Kotlin Multiplatform (KMP) strategy to facilitate shared development across Android and iOS platforms. In this position, you will not only enhance your skills but also play a pivotal role in implementing this innovative technology, influencing the future of our mobile applications.We are looking for a developer who prioritizes user-centric design, values precision, and excels in collaborative environments. You will bring clarity to communication and thrive within a cross-functional team.This is a B2B role based in Warsaw.Key ResponsibilitiesDevelop and implement new features for the item catalog within the SumUp SuperApp.Contribute to the architecture of the application and support our Kotlin Multiplatform strategy.Maintain and enhance our unified Android application, ensuring high-quality and scalable solutions across 60+ countries.Drive the evolution of our product by identifying opportunities for improvement and participating in daily decision-making.Create comprehensive documentation and execute robust testing for features prior to release.Collaborate closely with Designers, Product Managers, and Android engineers to ensure a cohesive user experience across platforms.Ideal Candidate ProfileOver 8 years of experience in mobile engineering, specifically with Android and Kotlin.At least 2 years of experience working with Jetpack Compose.A strong understanding of software design patterns (e.g., MVVM, MVI) and expertise in creating modular, scalable app architectures.Proficient in reactive programming concepts (Flow, Coroutines, and Concurrency).A solid grasp of testing best practices, ensuring high-quality deliverables.

Join Our Innovative TeamAt SumUp, we empower businesses—from cafes and shops to bars and salons—with our cutting-edge Point-of-Sale (POS) solution. This innovative platform offers a comprehensive array of features, including product catalogs, inventory management, business analytics, compliance support, and loyalty tools, designed to enhance operational efficiency and foster growth.Our POS solution seamlessly integrates into the SumUp SuperApp, supporting both our proprietary register hardware and mobile devices such as tablets and smartphones.Your Role as an Android EngineerAs a key member of our dynamic team, you will collaborate with Product Managers, Designers, Engineering Managers, and fellow engineers to drive the development of our mobile applications. We are transitioning towards a Kotlin Multiplatform (KMP) strategy, allowing for shared development across Android and iOS platforms. In this role, you will have the opportunity to learn, refine, and implement KMP technologies, significantly shaping the future of our mobile applications.We value user-centric design and seamless collaboration. If you thrive in a cross-functional environment and bring structure to communication, we want you on our team!

Join Saily, where we are revolutionizing mobile connectivity while you travel with our service that eliminates roaming fees and the need for plastic SIM cards, providing seamless, secure mobile data in over 200 destinations worldwide. With millions of customers and countless travelers engaged with Saily at any time, we are committed to delivering the best mobile experience.Our AI-native Product Engineering culture is designed for innovation:The Engineer takes ownership, managing projects from concept through to production.AI Agents support engineers by handling coding and repetitive tasks, enhancing productivity.Every team member is encouraged to suggest improvements, fostering a culture of constant enhancement.We prioritize curiosity, learning, and sharing knowledge.The comfort and connectivity of our customers is always our primary focus.At Saily, we emphasize growth over comfort, contribution over hierarchy, and impact over process, providing our talented team with the autonomy and AI tools necessary to excel in their roles.

Join our dynamic team as an Android Developer specializing in Kotlin. We are in the process of developing an innovative mobile application designed to facilitate scheduling and conducting inspections for field teams. This application will feature a Bluetooth module that enables seamless connectivity and configuration of inspection robots, enhancing the interaction between human operators and robotic systems.Key ResponsibilitiesArchitect and develop Android applications leveraging Kotlin.Implement Bluetooth Low Energy (BLE) modules for connecting, configuring, and managing inspection robots.Create robust scheduling and task management functionalities tailored for field inspection teams.Work closely with designers to ensure an optimized UI/UX experience for mobile applications used in challenging environments.Maintain application observability through effective logging, monitoring, and error reporting.Enhance quality assurance processes through unit testing, automated UI tests, and CI/CD pipeline management.

Join Saily, where we are transforming the travel experience by eliminating the hassle of staying connected while on the go. Our service offers lightning-fast, secure mobile data across 200+ destinations, without the burden of roaming fees or plastic SIM cards. With millions of satisfied customers and countless travelers engaging with our service, we are on a mission to redefine connectivity.At Saily, we cultivate an AI-native Product Engineering culture, which empowers our engineers to take full ownership of product development from conception to deployment. Our AI Agents handle repetitive tasks and assist engineers in maximizing their productivity. We believe in the collective effort to enhance our service by continuously identifying areas for improvement and implementing innovative solutions.We prioritize curiosity, learning, and collaboration while keeping our customers' comfort and connectivity as our core focus. At Saily, we value growth over comfort, contribution over hierarchy, and impact over process, providing our talented team with the autonomy and context necessary to excel.

Join moss as a Senior Mobile Engineer specializing in Android development. We are seeking a passionate and innovative engineer to lead our mobile projects, enhance user experience, and contribute to a dynamic team. Your expertise will help shape the future of our mobile applications, ensuring they are robust, user-friendly, and scalable.

Join Saily, where we simplify global connectivity without the burden of roaming fees or cumbersome SIM cards. With access to rapid, secure mobile data across 200+ destinations, we cater to millions of satisfied customers and hundreds of thousands of travelers exploring our services at any moment.Our commitment to developing outstanding products is driven by an AI-native Product Engineering culture that emphasizes:The engineer as a builder, taking ownership of the project lifecycle from conception through to production.AI agents that assist by automating repetitive tasks, enabling engineers to focus on impactful work.A collaborative environment where team members actively propose enhancements to improve efficiency.A culture of curiosity, knowledge-sharing, and continuous learning.Maintaining our customer focus, ensuring seamless and enjoyable journeys.At Saily, we prioritize growth over complacency, contribution over hierarchy, and meaningful impact over rigid processes. We empower talented individuals with the autonomy and context needed to perform their best work.

Join Saily, where we revolutionize connectivity for travelers by eliminating roaming fees and plastic SIM cards, offering seamless, high-speed mobile data in over 200 destinations. With millions of satisfied customers and countless travelers engaging with Saily at any moment, our mission is clear.We cultivate an AI-native Product Engineering culture that empowers our engineers to be builders, taking ownership of customer challenges from concept to deployment. AI agents assist in coding and automating repetitive tasks, enhancing engineers' productivity. We believe in constant improvement, where every team member is encouraged to propose enhancements and implement innovative solutions.Curiosity and knowledge sharing are vital to us, ensuring that our primary focus remains on delivering a comfortable, connected, and hassle-free experience for our customers.At Saily, we prioritize growth over comfort, contributions over hierarchy, and impact over process. We empower talented individuals with the context, autonomy, and AI tools necessary to excel in their roles.

Join Saily, where we revolutionize connectivity for travelers. Say goodbye to roaming fees and plastic SIM cards. We offer lightning-fast, secure mobile data in over 200 destinations worldwide. With millions of paying customers and countless travelers using Saily at any moment, our mission is to enhance the travel experience.At Saily, we cultivate an AI-native Product Engineering culture that emphasizes:Engineers as builders responsible for end-to-end solutions, from concept to production.AI agents that empower engineers by automating repetitive tasks, allowing them to focus on impactful work.A collaborative environment where everyone is encouraged to suggest and implement improvements.A culture of curiosity, continuous learning, and knowledge sharing.Prioritizing customer satisfaction and ensuring a seamless journey for our users.We believe in prioritizing growth over comfort, contribution over hierarchy, and impact over process. At Saily, we empower talented individuals with the context, autonomy, and AI tools necessary to excel in their roles.Key Responsibilities:Design and implement robust test automation frameworks across multiple platforms, developing automated tests for complex functional integration, regression, and performance evaluations to ensure compliance with acceptance criteria.Contribute to the formulation and execution of testing strategies.Engage in the development of comprehensive test plans and test cases.Identify and document software defects, collaborating with the development team to resolve issues.Conduct hands-on exploratory and manual testing to identify edge cases and usability concerns that automated tests might overlook.Validate intricate user flows end-to-end across mobile and other platforms prior to major releases.AI Integration & Advocacy:Proactively explore and incorporate AI-driven tools into QA workflows to enhance test creation, broaden coverage, and minimize cycle times.Promote the adoption of AI-assisted testing methodologies throughout the engineering organization.Experiment with large language models (LLMs) and AI assistants to generate test data, develop test cases from requirements, and manage flaky tests.

Join Saily, where we simplify secure mobile data plans for travelers.Experience travel without the burden of roaming fees or plastic SIM cards. Enjoy fast and secure mobile data in over 200 countries with the team behind Lonely Planet's leading eSIM, powered by NordVPN.Your contribution? Ensuring that people remain securely connected, wherever their adventures take them.

At Saily, we are revolutionizing the way travelers stay connected—eliminating roaming fees and plastic SIM cards in favor of secure, high-speed mobile data across 200+ destinations worldwide. With millions of paying customers and hundreds of thousands actively engaged at any time, our mission is to enhance the travel experience.To deliver the best products, we cultivate an AI-native Product Engineering culture that empowers our engineers to:Take complete ownership of projects—from initial concept to productionDevelop features without the necessity for exhaustive specificationsCollaborate closely with product managers, designers, data specialists, and fellow engineersWork in small, autonomous teams that prioritize innovationLeverage AI agents for specification, coding, analysis, testing, and iterationAchieve double the output compared to a traditional Senior EngineerEnhance our internal agent network and development processesNavigate across the technology stack as requiredPrioritize user and business outcomes over mere outputCore RequirementsDemonstrated experience in designing, building, and deploying AI-native tools or applications with successful measurable outcomesProficient in developing full-stack features for mobile or web applications (frontend and backend)Strong problem-solving skills and a passion for innovation

Join Saily, where we simplify connectivity for travelers by eliminating roaming fees and plastic SIM cards, providing secure mobile data at over 200 destinations. With millions of paying customers and countless travelers accessing our services, your contributions will truly matter.We embrace an AI-native Product Engineering culture, where:The Engineer is a builder, tackling customer challenges from concept to implementation.AI Agents assist in coding and automating repetitive tasks, enabling Engineers to focus on impactful work.Everyone is encouraged to identify improvement opportunities and implement solutions.Curiosity and knowledge sharing are core to our team dynamics.Our ultimate goal is to ensure a comfortable and hassle-free journey for our customers.At Saily, we prioritize growth over comfort, contribution over hierarchy, and impact over process. We empower talented individuals with context, autonomy, and AI to enhance their productivity.We are excited to welcome motivated junior engineers to our team. Here, your impact is defined not by years of experience, but by your passion for learning, discipline, and innovative thinking. You'll have the opportunity to shape your environment, and Saily will provide the platform for you to do just that.Expect hands-on experience with AI-driven software development, full access to learning resources tailored to your growth, and the chance to work on a successful and technically challenging product that you will be proud to build.Bring your skills and vision, and become part of the Saily journey!

About Saily at Nordsec Saily helps travelers stay connected with mobile data solutions in over 200 destinations. No roaming fees, no plastic SIM cards, just reliable, secure data access. Millions of travelers use Saily to simplify their journeys and stay online wherever they go. The team builds products within an AI-native Product Engineering culture. Engineers take responsibility for solving real customer problems, guiding projects from idea to launch. AI agents handle repetitive tasks so the team can focus on meaningful work. Everyone is encouraged to suggest improvements and deliver changes that matter. Saily values growth, collaboration, and customer satisfaction. Creativity and curiosity are encouraged, making it a place where new ideas can take shape.

Join Saily, where we simplify securing mobile data plans for globetrotters.With no roaming fees and no cumbersome SIM cards, we offer swift and secure data solutions in over 200 countries. Be part of the team behind Lonely Planet’s leading eSIM, powered by NordVPN, dedicated to explorers.Your Contribution: Ensure individuals remain securely connected, no matter their destination.Design Team is an innovative, multidisciplinary collective of product designers, web designers, UX researchers, UX writers, and graphic designers. We are at the forefront of digital freedom with our cybersecurity offerings, including NordVPN, NordPass, NordProtect, and Saily. Our mission is to empower millions of users to take control of their online presence.As a Design Team, we aim to demystify the intricacies of cybersecurity for everyone. We value open feedback to foster growth and encourage taking bold initiatives and exploring new concepts.We are seeking a creative, detail-oriented Senior Graphic Designer to enhance our Nord Security products. If you are passionate about design, thrive in dynamic environments, and enjoy collaborating with a diverse team, we invite you to apply.

About Saily Saily, part of nordsec, helps travelers stay connected without roaming fees or physical SIM cards. Our platform delivers fast, secure mobile data in more than 200 destinations. With millions of paying users and hundreds of thousands online at any moment, we focus on making travel easier and more enjoyable. Our Product Engineering Culture Engineers own the entire product lifecycle, from initial concept through deployment. AI tools support coding and automate repetitive work, so engineers can focus on meaningful problems. Team members regularly suggest, discuss, and implement improvements together. We value curiosity, ongoing learning, and sharing knowledge across the team. Our main goal is to keep the travel experience smooth and stress-free for our users. We put growth ahead of comfort, impact above process, and contribution before hierarchy. Saily provides context, autonomy, and AI-driven tools to help people do their best work. About the Internship This is a 3-month, full-time paid internship based in Warsaw. Trainee Engineers work with experienced team members from day one, tackling real product challenges and building practical skills. Guidance is available, but interns are encouraged to take ownership and grow into their responsibilities. We use AI as a standard part of our workflow and emphasize strong engineering habits from the start. Outstanding interns may receive an offer for a full-time position at the end of the program. Who We’re Looking For Clear thinkers who learn quickly and take responsibility for their work Curious, self-disciplined individuals ready to contribute in a collaborative setting People eager for hands-on experience with real products, not just theoretical tasks If this sounds like the right fit, apply now to join the Saily team in Warsaw.