Full-stack Product Engineer Intern at Saily | Warsaw

Internship Overview Saily, part of Nord Security, is looking for an Agentic Product Engineer Intern focused on full-stack development. This role is based in Warsaw and provides direct experience with both front-end and back-end technologies. What You Will Do Work alongside experienced developers on active projects Contribute to building and improving product features Develop skills across the full technology stack What You’ll Gain Hands-on experience in full-stack engineering Exposure to real-world software development practices Mentorship from established professionals in the field This internship is designed for those eager to grow as engineers while making a real impact on Saily’s products.

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!

At Saily, we are revolutionizing the way people stay connected while traveling. With no roaming fees and no plastic SIM cards, we provide lightning-fast and secure mobile data across over 200 destinations. Our platform is trusted by millions of paying customers and frequented by hundreds of thousands of travelers daily.To deliver the best possible product, we have cultivated an AI-native Product Engineering culture that empowers:The Engineer as a builder, owning the customer problem-solving process from inception to production.AI Agents that assist by writing significant portions of code and automating repeatable tasks, enabling Engineers to amplify their contributions.A collaborative environment where everyone plays a role in enhancing Saily by proposing new areas for agent delegation and executing those improvements.A culture of curiosity, continuous learning, and knowledge sharing, ensuring that the customer experience, marked by comfort and connectivity, remains our primary focus.We prioritize growth over comfort, contribution over hierarchy, and impact over process. At Saily, we trust in giving talented individuals the context, autonomy, and AI tools they need to do their best work.We are excited to welcome motivated junior engineers to our team because we believe that true impact is not defined by years of experience, but rather by your eagerness to learn, discipline, and innovative mindset. Saily offers you the space to shape and enhance your surroundings.What can you expect from us? You will gain hands-on experience in AI-assisted software development, access to various learning resources, and the chance to work on a successful, impactful, and technically stimulating product that you will be proud to build.Bring your skills, your vision, and join Saily!Main ResponsibilitiesContribute to delivering tools and features with guidance from the team.Collaborate effectively with product managers, designers, and fellow engineers.Work within small, independent teams.Learn to leverage AI agents for specifications, coding, analysis, testing, and iterative processes.Participate in enhancing our internal agent network and development workflows.Focus on achieving user and business outcomes rather than just output.

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 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 our dynamic team at Nordsec as a Senior Full Stack Product Engineer. In this role, you will leverage your expertise across the stack to design, develop, and deploy cutting-edge solutions that enhance user experiences and drive business success. You will work collaboratively with cross-functional teams to bring innovative product features to life.

Bolt is looking for a Senior Full Stack Engineer in Warsaw to help shape and expand an internal task management platform. This role centers on building systems that support real-time decision-making and optimize workflows for agents. What you will do Develop and enhance features for the internal platform, focusing on dynamic task distribution and intelligent workforce management. Create efficient user interfaces that enable agents to work effectively and access actionable insights. Lead frontend architecture decisions and guide the technical direction of the team. Work across the full technology stack, collaborating with engineers and stakeholders. Role overview This position involves tackling product and engineering challenges, from designing scalable interfaces to implementing systems that streamline internal operations. The Senior Full Stack Engineer will play a key part in both technical leadership and hands-on development.

Join our team as a Senior Full Stack Engineer and contribute to cutting-edge projects that push the boundaries of technology. You will work in a collaborative environment, utilizing your expertise in both front-end and back-end development. We're looking for someone who is not only technically proficient but also passionate about delivering high-quality solutions.

Are you an experienced Android Engineer with a passion for Kotlin? Join the innovative team at Saily, where we are dedicated to creating cutting-edge applications that enhance user experiences. As a Senior Android Engineer, you will play a crucial role in designing, developing, and maintaining high-quality mobile applications. Collaborate with cross-functional teams, contribute to architectural decisions, and mentor junior developers in a dynamic and supportive environment.

Join Larian Studios as a DevOps Full Stack Developer in Warsaw! We are looking for a passionate and skilled individual to help us create cutting-edge solutions that enhance our game development and deployment processes. In this role, you will collaborate with cross-functional teams to ensure seamless integration and delivery of our gaming projects.

Join the dynamic team at altersolutions as a Full-Stack Developer. In this role, you will be responsible for designing and implementing robust web applications. You will work closely with cross-functional teams to create streamlined solutions and ensure optimal user experience.

At CreatorIQ, we are revolutionizing the way brands engage with creators, trusted by over 1,300 global brands and agencies. Our mission is to humanize businesses and amplify human impact. We embody our core values: intentionality, excellence, collaboration, and kindness.Recognized as one of the best companies to work for by BuiltIn LA and NY, we have also been named a Fastest-Growing Company in North America by Deloitte Technology Fast 500™ for four consecutive years. Our accolades include being recognized as a leader in IDC MarketScape: Worldwide Influencer Marketing Platforms for Large Enterprises in 2025, and achieving high ratings from G2 and Influencer MarketingHub.Join us in our flexible work environment that promotes both in-person and remote collaboration, fostering innovation and accommodating diverse work styles.Position OverviewWe are on the lookout for a Senior Full Stack Developer to contribute to our exciting new project, Gifting. This innovative solution allows brands to send products to creators seamlessly, manage fulfillment, and track outcomes, propelling the future of creator commerce.In this high-impact role, you will work across the entire technology stack to design and build scalable systems from scratch. Collaborating closely with product and design teams, you will define the architecture, deliver quickly, and enhance a completely new user experience.Technical StackFrontend: React, TypeScript, JoyUI/MUIBackend: Python (Django), Node.js (TypeScript)Infrastructure: AWS (Lambda, EC2)Key Responsibilities:Lead end-to-end feature development across both frontend and backend (equal contribution)Contribute to the architecture and design of our greenfield product, influencing technical direction from the outsetCreate scalable APIs and services leveraging Django and Node.jsDevelop user-friendly, high-performance interfaces with React and modern component libraries

Join psicro as a Full-Stack / Power Platform Developer and be part of a dynamic team that is dedicated to delivering innovative solutions. In this role, you will leverage your expertise in full-stack development and the Microsoft Power Platform to create impactful applications and streamline processes.As a developer at psicro, you will work on exciting projects, collaborating with cross-functional teams to drive success and enhance user experiences. If you are passionate about technology and want to make a difference, we want to hear from you!

Join our dynamic team at Jobs for Humanity as a Mid-Level Full-Stack Developer. In this role, you will play a pivotal role in developing and maintaining web applications that make a difference for job seekers around the world. You will work on both front-end and back-end development, collaborating with cross-functional teams to deliver high-quality software solutions.

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.

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 dynamic team as a Full-stack Developer, where you will play a pivotal role in integrating the Charge app within the electric vehicle ecosystem for a prestigious German automotive manufacturer. This project focuses on ensuring seamless communication between various Charge Point Operators (CPOs) and end-users, emphasizing real-time synchronization of charging station data (availability, power). Your efforts will contribute to a smooth user experience, from locating a charger to invoicing.

Role overview Sigma Software Group seeks a Principal Full-Stack Engineer with deep frontend expertise for its Warsaw office. The position involves designing and building web applications that put user experience at the center. Collaboration is essential, as the role works closely with colleagues from different disciplines to ensure software solutions meet client expectations. What you will do Design and implement web applications with a strong emphasis on frontend quality and usability Collaborate with cross-functional teams to deliver reliable, high-quality software Lead technical projects and set direction for development efforts Mentor junior engineers and help shape team best practices Requirements Extensive experience in both frontend and backend development Demonstrated ability to lead projects and guide teams Proven track record of mentoring and supporting junior developers Strong commitment to building user-centric software This Warsaw-based role offers the opportunity to influence client projects and contribute to the growth of the team.

Join our dynamic team at HOS247 LLC as a Senior Full-Stack Developer in a fully remote capacity. We are on the lookout for talented developers who are eager to enhance and innovate our existing suite of products. In this role, you will work closely with our Chief Technology Officer, collaborating on developing and refining solutions that drive our business forward.The ideal candidate will possess a robust background in full-stack development, with a minimum of three years of hands-on experience in Angular 2+ and Node.js.