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Fullstack Software Engineer Senior Level jobs in Warsaw· Page 2

Results 21–40 of 813 for “Fullstack Software Engineer Senior Level” in Warsaw.

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Complexio logo
Full-time|On-site|Warsaw, Masovian Voivodeship, Poland

Join Complexio, where our innovative AI platform revolutionizes business processes by efficiently managing and comprehending extensive enterprise data—both structured and unstructured. Utilizing proprietary models, knowledge graphs, and orchestration layers, we streamline human-computer interactions and autonomously execute intricate workflows on a large sca…

Oct 6, 2025
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Box, Inc. logo
Full-time|On-site|Warsaw, Poland

WHAT IS BOX? Box (NYSE:BOX) stands at the forefront of Intelligent Content Management. Our innovative platform empowers organizations to enhance collaboration, manage comprehensive content lifecycles, safeguard essential data, and revolutionize business workflows with enterprise AI. In this new AI-first business landscape, we enable companies to flourish. Established in 2005, Box simplifies operations for some of the world's leading organizations, including JLL, Morgan Stanley, and Nationwide, with our headquarters located in Redwood City, CA, and offices in the U.S., Europe, and Asia.Joining Box means you will play a pivotal role in advancing our platform. Content is the backbone of daily operations, encompassing billions of files and information shared across teams and departments—ranging from contracts, invoices, employee records, to marketing assets. Our mission is to infuse intelligence into content management, enabling our customers to entirely transform their workflows. With the integration of AI and enterprise content, the potential to reshape how the world collaborates has never been more significant, and at Box, you will be at the forefront of this transformative journey.WHY BOX NEEDS YOUBox Apps is transforming how enterprises utilize content by delivering an intelligent no-code builder that facilitates automation, orchestration, and faster decision-making. We are investing in our Warsaw hub to scale this innovative product globally. As a Senior Software Engineer, you will spearhead projects from conception to production, elevate engineering standards, and influence our technical strategy for a rapidly expanding product utilized by thousands of customers.WHAT YOU’LL DOTake the lead in designing and delivering complex, user-facing features and platform capabilities for the Box Apps frontend.Collaborate closely with product, design, and backend teams to define APIs, data contracts, and seamless end-to-end experiences.Drive the creation of technical specifications, architectural reviews, and design documentation that prioritize speed, quality, and maintainability.Advocate for reliability through rigorous testing (unit/integration/e2e), performance profiling, and observability.Mentor fellow engineers through pairing sessions, design reviews, and constructive feedback, enhancing team practices.Break down complex problems, develop roadmaps, and deliver iteratively in line with quarterly objectives.

Feb 23, 2026
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altersolutions logo
Full-time|On-site|Warsaw

Join our innovative team as a Senior Software Engineer focused on transforming business processes through cutting-edge artificial intelligence and advanced technologies. This project is dedicated to optimizing intelligent data handling and facilitating automated decision-making, utilizing modern, high-performance solutions that guarantee efficiency, security, and scalability.

Jul 30, 2025
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Waymo LLC logo
Full-time|Hybrid|Warsaw, Poland

Waymo is at the forefront of autonomous driving technology, committed to becoming the most trusted driver globally. Originating from the Google Self-Driving Car Project in 2009, Waymo is dedicated to creating the Waymo Driver—The World’s Most Experienced Driver™—to enhance mobility access and save lives lost in traffic accidents. This innovative driver is the backbone of Waymo’s fully autonomous ride-hail service and is adaptable to various vehicle platforms and applications. With over ten million rider-only trips and extensive experience driving autonomously over 100 million miles on public roads, Waymo is changing the landscape of transportation.Are you ready to contribute to the next generation of infrastructure for driverless vehicles?Join our Fleet Orchestration and Optimization team at Waymo and play a pivotal role in shaping the future of transportation! We seek a dedicated Senior Software Engineer eager to enhance our core ride-hailing and fleet management systems.As a product-minded individual, you will tackle cross-functional challenges that require collaboration across teams (mobile applications, cloud backends, and the Waymo Driver) and various functions (operations, product, legal, partnerships, policy & privacy) to design and deliver essential infrastructure for our business.In this hybrid role, you will report directly to an Engineering Manager.

Feb 10, 2026
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Complexio logo
Full-time|On-site|Warsaw, Masovian Voivodeship, Poland

Join Complexio, a pioneering joint venture at the forefront of AI innovation, dedicated to streamlining business processes through advanced automation. Our Foundational AI platform leverages comprehensive enterprise data—both structured and unstructured—to enhance productivity and drive intelligent decision-making.With a collaborative team of experts from diverse fields, we utilize proprietary models and knowledge graphs to optimize human-computer interactions and execute complex workflows autonomously at scale. Our mission is to redefine enterprise efficiency through context-aware, privacy-first automation.If you are passionate about harnessing AI and advanced technologies to transform business processes and are eager to contribute to a dynamic project, we invite you to apply!

Sep 24, 2025
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Complexio logo
Full-time|On-site|Warsaw, Masovian Voivodeship, Poland

Join Complexio, a pioneering company at the forefront of AI-driven business automation. Our Foundational AI platform revolutionizes enterprise productivity by efficiently managing both structured and unstructured data. Leveraging proprietary models, knowledge graphs, and orchestration layers, we empower organizations to enhance human-computer interactions and automate complex workflows seamlessly.As a joint venture established between Hafnia and Símbolo, and supported by esteemed partners including Marfin Management, C Transport Maritime, BW Epic Kosan, and Trans Sea Transport, Complexio is on a mission to redefine the landscape of business operations through privacy-first automation.Your role will focus on optimizing business processes using advanced AI technologies, facilitating intelligent data management, and enabling automated decision-making. Our solutions are designed for high performance, ensuring security and scalability in modern enterprises.

Oct 7, 2025
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Nearmap logo
Full-time|On-site|Warsaw

As a Lead Senior Software Engineer on the API team at Nearmap, you will take charge of guiding developers in the design, implementation, and delivery of innovative software solutions that significantly contribute to Nearmap's business goals and effectively address real-world challenges faced by our users. You will collaborate closely with the Product team to analyze, design, and enhance software solutions while elevating the development team's skills by promoting best practices and providing coaching to help individuals reach their full potential.Your work will directly impact a platform that manages petabytes of aerial imagery, drives sophisticated AI models, and delivers real-time geospatial insights to clients globally. From data ingestion and processing to intelligent API delivery and user-facing applications, our systems redefine performance, scalability, and innovation.This role presents a unique opportunity to influence quality practices across a comprehensive platform that encompasses high-resolution imagery, AI-driven insights, and scalable data delivery systems while helping to establish API projects within our new engineering hub in Warsaw. You will play a vital role in ensuring the dependability of systems that are transforming how industries make pivotal decisions at scale.At Nearmap, we seek engineers who are adaptable, exhibit leadership qualities, and are eager to tackle new challenges across the full stack as we strive to advance technology.

Mar 2, 2026
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RTB House logo
Full-time|On-site|Warsaw, Masovian Voivodeship, Poland

Location: Poland About Us: RTB House is an innovative global leader in marketing technology, dedicated to developing cutting-edge solutions for esteemed brands and agencies around the globe. Our unique ad-buying engine, driven entirely by advanced Deep Learning algorithms, empowers advertisers to achieve remarkable results and meet their objectives across all stages of the marketing funnel. Since our inception in 2012, we have expanded our operations to over 90 markets while maintaining a steadfast commitment to first-party advertising and continuous innovation. RTB House provides comprehensive, Deep Learning-powered AdTech products and solutions designed to enhance conversion rates, drive customer acquisition, foster engagement, and stimulate long-term demand for a diverse clientele worldwide. Your Role: We are seeking a Senior Software Engineer to join our team in designing, developing, and fine-tuning high-performance backend systems that facilitate real-time bidding (RTB) and machine learning at scale. You will be instrumental in creating software that manages billions of daily transactions, ensuring adherence to stringent latency and reliability requirements within a distributed, low-latency environment.

Oct 3, 2025
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Bolt Technology OÜ logo
Full-time|On-site|Warsaw, Poland

Join Our Team!We are on the lookout for a highly skilled Senior Full Stack Software Engineer to be a pivotal part of our innovative teams in Warsaw. At Bolt, our engineering teams tackle unique product challenges that involve sophisticated algorithms for demand forecasting, real-time pricing optimization, routing logistics, fraud detection, and distributed systems, among others.About UsWith a customer base exceeding 200 million across more than 50 countries, Bolt stands as one of the fastest-growing tech firms in Europe and Africa. This remarkable growth is a testament to the dedication and talent of our team members.We foster an inclusive culture where every individual is valued, regardless of race, color, religion, gender identity, sexual orientation, national origin, age, or disability. Our ultimate aim is to create urban environments that prioritize people over vehicles, and we would love for you to help us realize this vision!

Mar 27, 2026
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inetum2 logo
Full-time|On-site|Warsaw

Role overview inetum2 seeks a Senior JVM Software Engineer in Warsaw to focus on Keycloak-based solutions. The position involves designing and building secure, scalable identity and access management systems. These efforts aim to balance strong security with a smooth user experience while supporting business needs. What you will do Design and implement identity and access management features using Keycloak and JVM technologies Collaborate with cross-disciplinary teams to deliver reliable, high-quality software Develop solutions that protect user data and align with business objectives Location This position is based in Warsaw.

Apr 22, 2026
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Aurora Solar logo
Full-time|Hybrid|Warsaw, Poland

About Aurora SolarAt Aurora Solar, we are dedicated to pioneering a future where solar energy is accessible to everyone. Our award-winning software empowers solar professionals by harnessing the power of data and technology, simplifying and streamlining solar adoption. To date, our software has facilitated the design of millions of solar projects, enabling solar companies to efficiently sell, design, and install residential and commercial solar systems with unmatched accuracy and scalability.Recognized as one of "The Best Remote Companies To Work for in 2025" by BuiltIn.com, and honored for the second consecutive time as a Certified Green Business (CGB) by the city of San Francisco, we are committed to facilitating the global transition to solar energy.About the TeamJoin us as we redefine solar design by creating automated, compliant, and installation-ready solutions. Our team is responsible for delivering construction-ready designs for residential PV and storage systems, ensuring that every layout adheres to relevant codes, standards, and manufacturer specifications. We cultivate a collaborative and respectful work environment that encourages boundary-pushing and mutual growth.About the RoleAs a Senior Software Engineer on our Install-Ready Design team, you will architect and enhance backend systems that will drive the next wave of solar installations. You will address complex challenges with precision, creating tools that are robust, reliable, and impactful. This is a hybrid position based in Warsaw, Poland.Your ImpactDesign and implement new features to improve the performance and accuracy of our platformCollaborate with key partners across the solar ecosystem to enhance end-to-end project workflowsDevelop new functionalities for our leading solar design platformLead the development of pioneering greenfield products that redefine solar system design and deploymentAssume operational responsibility for the services managed by your team, including participation in an on-call rotationWhat You Bring5+ years of professional experience in software engineeringProficient in writing high-quality, maintainable codeExperience with backend technologies and frameworksStrong problem-solving skills and the ability to work collaboratively in a dynamic environment

Nov 18, 2025
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Nearmap logo
Full-time|On-site|Warsaw

Join our dynamic API team as a Lead Senior Software Engineer at Nearmap, where your expertise will drive innovative software solutions that align with our business goals. You will lead a talented group of developers in designing, implementing, and delivering impactful software that addresses real-world challenges faced by our users. Collaborating closely with the Product team, you will help design software solutions that enhance our development team's capabilities by promoting best practices and mentoring individuals to reach their full potential.Your contributions will impact a sophisticated platform that processes massive volumes of aerial imagery, powers cutting-edge AI models, and provides real-time geospatial insights to clients globally. Our systems stretch the limits of performance and scalability, from data ingestion and processing to intelligent delivery through APIs and customer-facing applications.This is a unique opportunity to influence quality practices across a comprehensive platform that includes high-resolution imagery, AI-driven insights, and scalable data delivery systems, all while establishing API projects at our new engineering hub in Warsaw. You will play a pivotal role in guaranteeing the reliability of systems that are revolutionizing decision-making across various industries at scale.At Nearmap, we seek engineers who are adaptable, exhibit leadership qualities, and are eager to tackle new challenges across the full stack as we continue to advance technology.

May 30, 2025
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margo-group logo
Full-time|On-site|Warsaw

Join our client, a leading international technology company, as a Senior Software Engineer and play a pivotal role in enhancing a sophisticated platform that champions supply chain transparency and product provenance. This innovative solution employs cutting-edge technologies, including distributed ledger systems, artificial intelligence, and 3D data matching, to deliver secure and verifiable information about products from their origin to the end consumer. By collaborating with producers, manufacturers, distributors, and retailers, the company fosters trust, authenticity, and ethical standards throughout intricate global supply chains. Their advanced blockchain technology is currently tracking millions of products globally, showcasing a significant achievement in real-world industry applications.

Aug 29, 2025
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Nord Security logo
Full-time|On-site|Warsaw

Join Nord Security and innovate the future of online safety.At Nord Security, we empower users and businesses to reclaim their online privacy and security. Our diverse range of solutions—from VPNs and password managers to threat intelligence and eSIMs—are designed to address complex security challenges, earning the trust of millions around the globe.As a Senior Software Engineer, you'll play a pivotal role in enhancing our User Control Panel, ensuring users have a seamless and secure experience.Key ResponsibilitiesDesign and enhance a sophisticated User Control Panel to foster user trust and engagement, driving sustainable growth.Implement new features and improve user flows within the account management portal, including subscriptions, billing, and security options.Maintain a high-quality, scalable front-end codebase using modern best practices.Continuously enhance code quality, performance, and user experience.Write and uphold unit and integration tests alongside feature development.Contribute to the component library and design system standards.Engage in code reviews to uphold engineering excellence.Collaborate with backend engineers to define API contracts and handle errors effectively.Work with QA engineers to guarantee feature reliability and document workflows.Debug and resolve issues throughout the frontend stack, including UI rendering and state management.Advocate for best engineering practices and contribute to improving development processes.Conduct research and development activities to support new initiatives and make informed technical decisions.Mentor team members and provide technical guidance on best practices.Shape the team's technical vision and contribute to long-term goals.Essential Qualifications4+ years of experience in JavaScript and TypeScript programming.2+ years of hands-on experience with React framework.In-depth understanding of web development principles, testing methodologies, and performance optimization techniques.Proficiency in modern front-end development practices and tools.Strong problem-solving skills and attention to detail.

Apr 13, 2026
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Nordsec logo
Full-time|On-site|Warsaw

Join our dynamic UCP team at Nordsec as a Senior Software Engineer specializing in React. In this role, you will engage in developing innovative software solutions that enhance user experiences and drive our mission forward. Your expertise in React and software development will be pivotal in designing, implementing, and maintaining high-quality applications.As a member of our team, you will collaborate with cross-functional teams, contribute to architectural decisions, and mentor junior developers. We value creativity, problem-solving, and a commitment to excellence.

Apr 13, 2026
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1GLOBAL logo
Full-time|On-site|Warsaw, Masovian Voivodeship, Poland

About Us1GLOBAL is an innovative technology leader in mobile communications, offering unparalleled global connectivity solutions for both enterprises and consumers. Our cutting-edge telecom platform features a robust, owned global mobile core network, state-of-the-art in-house developed eSIM technology, and a wide array of telecom licenses, allowing us to operate as a fully regulated telecommunications provider in 40 countries around the globe.We proudly serve some of the world’s most prominent banks, enterprises, and digital-first businesses, including neo-banks, global FMCG leaders, travel industry giants, and payment service providers. Currently, we empower over 70 million people and devices worldwide, facilitating our clients to launch, scale, and innovate confidently within the mobile ecosystem.1GLOBAL is a rapidly growing, profitable entity, projecting full-year revenues exceeding US$200 million and profits over US$25 million by 2025. Our robust cash flow supports continuous investments in infrastructure, platform innovation, and global expansion. Recent years have been pivotal for us, marked by significant enterprise and consumer client acquisitions that enhance our status as a formidable global mobile connectivity provider, dedicated to helping consumer brands thrive in telecommunications.Founded in 2022 by seasoned technology entrepreneurs Hakan Koç and Pyrros Koussios, 1GLOBAL is at the forefront of shaping the future of global telecommunications. We operate as a fully regulated Mobile Virtual Network Operator (MVNO) in 12 countries and as a regulated telecom operator in an additional 28 markets. Headquartered in the Netherlands, with premier R&D centers in Lisbon, Berlin, and São Paulo, our team of nearly 500 experts across 15 countries is unified by a singular mission: to redefine global mobile connectivity through unparalleled technology, scale, and operational excellence.About the TeamThis senior, hands-on Java position focuses on scalable backend systems, long-term ownership, and addressing real-world production challenges. You will be part of a newly formed backend team in Warsaw, dedicated to advancing our eSIM, global connectivity platform, and IoT solutions.The role entails:Enhancing and modernizing existing systems,Developing new services and greenfield components,Boosting reliability, performance, and maintainability across the platform.As a senior engineer, you will also lead the evolution of testing methodologies as systems evolve.

Feb 25, 2026
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Satispay logo
Full-time|On-site|Poland, Warsaw

Please note that this opportunity requires relocation to our Milan office.About SatispayAt Satispay, we are on a mission to revolutionize everyday payments, making them simple, equitable, and accessible to everyone. Our vision is to shape the future of money, and we are just getting started. Join our movement that empowers millions, driven by a shared purpose to tackle significant challenges. We thrive on speed, bold thinking, and mutual trust, encouraging each other to challenge the status quo while learning and growing together.If you seek more than just another job and wish to create something impactful alongside a talented team, you’ve come to the right place.Your ResponsibilitiesAs a Senior Backend Software Engineer in the Business Team, you will play a pivotal role in shaping the future of digital welfare payments, managing everything from employer benefits to complex products. You will oversee the end-to-end experience for both employers and employees, ensuring long-term satisfaction. Your responsibilities will include:Drive Multi-Service Solutions: Conduct technical analysis for medium-to-large projects impacting multiple employer domain services. Design highly-available, scalable, secure, and maintainable solutions at the core of welfare offerings.Ensure Technical Quality: Implement robust testing strategies, balancing automation and manual coverage, while monitoring gradual rollouts to ensure precise and reliable welfare distributions.Resolve and Anticipate Blockers: Proactively identify and resolve technical obstacles, fostering knowledge sharing across your organization. Address unique challenges in B2B registration flows and high-volume benefit allocations while ensuring code quality through active reviews.Execution and Ownership: Take full ownership of your projects from inception to completion, delivering features that genuinely meet user needs—from employer signup to the first employee spending their welfare benefits—through seamless and efficient backend integration.

Mar 18, 2026
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Waymo logo
Full-time|Hybrid|Warsaw, Poland

Waymo is at the forefront of autonomous driving technology, dedicated to becoming the world's most reliable driver. Originating from the Google Self-Driving Car Project in 2009, our focus has been on developing the Waymo Driver—The World’s Most Experienced Driver™—to enhance mobility access while preventing countless traffic-related fatalities. Our Waymo Driver powers a fully autonomous ride-hail service, with the capability to be adapted across various vehicle platforms and applications. With over ten million rider-only trips completed and more than 100 million miles driven autonomously on public roads, complemented by extensive simulation across 15+ U.S. states, we are redefining transportation.The Waymo Car Experience team is tasked with delivering safe and enjoyable experiences for all riders. As a Senior Software Engineer, you will collaborate closely with the Operations team to identify and mitigate challenges such as lost items and incorrect passenger seating using data-driven insights and machine learning models.

Feb 10, 2026
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Box logo
On-site|On-site|Warsaw, Poland

Join Box as a Senior Backend Software Engineer and be part of a pioneering team that is reshaping the world of Intelligent Content Management. In this role, you will work on high-scale, distributed systems, tackling significant engineering challenges such as performance optimization, auto-scaling microservices, ensuring data integrity during large migrations, and maintaining search indexing accuracy. Your contributions will directly impact thousands of enterprise customers, helping them manage their critical business content effectively. If you're ready to drive innovation in AI-powered content management, we want to hear from you!

Feb 2, 2026
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Box Inc. logo
Full-time|On-site|Warsaw, Poland

Discover Your Future with BoxBox (NYSE:BOX) stands at the forefront of Intelligent Content Management, empowering organizations to enhance collaboration, manage comprehensive content lifecycles, secure vital assets, and revolutionize workflows through enterprise-grade AI. Since our inception in 2005, we have simplified operations for major global players such as JLL, Morgan Stanley, and Nationwide. With our headquarters in Redwood City, CA, and additional offices across the globe, we are committed to leading businesses into the AI-first era.At Box, you will have the opportunity to push the limits of our platform. Content is the heartbeat of collaboration, encompassing billions of files and data that flow seamlessly across teams and business functions every day—ranging from contracts and invoices to employee records and financial documents. Our mission is to infuse intelligence into content management, enabling our customers to transform operational workflows. As we integrate AI with enterprise content, the potential to reshape how organizations collaborate has never been more significant, and your contributions will be vital in this transformative journey.Your Role in Our MissionMetadata is integral to the Box Intelligent Cloud, allowing customers to enrich files with context, turning them into actionable content. Currently, our Metadata Platform is pivotal for organizing, discovering, annotating, securing, and retaining content. Its adoption is escalating as various Box products—including Shield, Relay, Forms, Sign, and Governance—leverage it, and our clients continue to develop custom applications around it. However, we have only begun to explore its full potential, and that’s where you come in!We are on the lookout for a Senior Software Engineer to join us on our quest to create a next-generation Metadata Platform. This role will place you at the heart of a dynamic, collaborative, and innovative engineering team, tackling complex challenges as we shape the future of intelligent content management in the cloud. The impact of your work will resonate across millions of users in some of the most significant enterprises of our time.

Feb 27, 2026

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