Senior Software Engineer at Complexio | Warsaw, 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 di…

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.

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 scale.As a joint venture between Hafnia and Símbolo, alongside partners such as Marfin Management, C Transport Maritime, BW Epic Kosan, and Trans Sea Transport, Complexio is at the forefront of redefining enterprise productivity through context-aware, privacy-first automation.This project is dedicated to enhancing business operations through cutting-edge artificial intelligence and advanced technologies, enabling intelligent data handling and automated decision-making. Our solutions are built with modern, high-performance architectures to guarantee efficiency, security, and scalability.

Join Complexio, where we are revolutionizing enterprise AI by developing an intelligence layer that automatically connects and enhances understanding of an organization’s personnel, processes, and systems. Our innovative platform processes both structured and unstructured data to create a dynamic Event Knowledge Graph, orchestrating a variety of AI models to discover hidden workflow enhancements and facilitate autonomous actions.As a Senior Full Stack Engineer, you will be at the forefront of shaping the user experience for thousands of enterprise users. Collaborating with a talented team of software engineers, data scientists, product specialists, and business analysts, you will help design next-generation web applications that bring our state-of-the-art automation capabilities to life. Your contributions will be vital in transforming complex data insights into user-friendly, efficient, and scalable interfaces, connecting advanced AI infrastructure with tangible business results.If you have a passion for integrating sophisticated front-end engineering, full-stack product development, and cutting-edge enterprise AI solutions, and thrive in a fast-paced, highly technical environment, we invite you to apply!

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.

Join CreatorIQ, the leading operating system for creator-led growth, trusted by over 1,300 global brands and agencies. Our mission is to humanize businesses and empower individuals to make a significant impact. Our core values — being intentional, striving for excellence, embracing the journey together, and acting as good humans — guide us every day.Recognized as one of the best companies to work for by BuiltIn LA and NY, and featured on the Deloitte Technology Fast 500™ for four consecutive years, CreatorIQ has solidified its position as a leader in the influencer marketing space, as noted in the IDC MarketScape and The Forrester New Wave™. With a flexible work model that encourages collaboration and innovation, we adapt to the unique work styles of our team members.We are looking for passionate and innovative individuals to join our vibrant team and help us transform the industry!Your Role as a Software Engineer:As a Software Engineer, you will design, develop, and maintain scalable, high-performance software applications. Your strong technical skills and problem-solving abilities will enable you to collaborate effectively with cross-functional teams. You will take ownership of moderately complex tasks, contribute to system architecture discussions, and continuously enhance development practices while aligning with our business objectives.Key Responsibilities:Design, develop, test, and maintain software applications that fulfill both business and technical requirements.Write clean, efficient, and maintainable code, adhering to best practices and coding standards.Engage in code reviews, offering and accepting constructive feedback to maintain high-quality software.Develop and execute unit and integration tests to ensure system reliability.Debug and resolve software issues to guarantee system stability and performance.Contribute to discussions on software architecture, focusing on scalability, maintainability, and security.Leverage AI-powered tools to enhance coding efficiency, debugging, and performance analysis.

Join Box as a Senior Software Engineer!At Box, we are revolutionizing the way organizations manage content. As the leader in Intelligent Content Management, our platform empowers businesses to collaborate, streamline workflows, and secure vital content through the power of enterprise AI. With a global clientele that includes industry giants like JLL, Morgan Stanley, and Nationwide, we are dedicated to transforming the workplace experience for our customers.By becoming part of Box, you will play a crucial role in advancing our eCommerce platform, which is pivotal for enabling customers of all sizes to purchase and manage their Box subscriptions through self-service solutions. This initiative not only supports our expansion into new international markets but also enhances our pricing and discount mechanisms to drive business growth. Your contributions will directly impact a significant portion of Box's revenue, making reliability and performance critical to our success.Your Responsibilities:Design and develop high-quality, scalable, and responsive software using cutting-edge technologies.Write clean, maintainable code adhering to industry best practices.Collaborate effectively with cross-functional teams including Designers and Product Managers to deliver exceptional user experiences.

Join us at capital, a premier trading platform expanding globally. Our award-winning products, recognized for their advanced technology and exceptional client experience, set the standard in the industry. We are on the lookout for top-tier talent to join our dynamic engineering team.We are currently enhancing our Backend Team and seeking passionate Java Software Engineers with a keen interest in trading! Our engineering team is crucial in maintaining the performance, security, and reliability of our products. With a focus on delivering superior performance, ensuring compliance, and protecting client data, your contributions will significantly enhance the trading experience for our clients.We value engineers who not only write exceptional code but also embody our core values. We are searching for individuals who are ready to move quickly, willing to innovate and develop, who understand the importance of listening, respecting, and supporting, strive to exceed client expectations, and take full ownership for achieving real impact.

About Aurora SolarAt Aurora Solar, we are dedicated to revolutionizing the solar industry. Our award-winning software empowers solar professionals with the data and technology they need to simplify and streamline solar adoption. To date, we have facilitated the design of millions of solar projects, enabling companies to effectively sell, design, and install residential and commercial solar solutions with precision and efficiency.Recognized as one of "The Best Remote Companies To Work for in 2025" by BuiltIn.com and honored as a Certified Green Business (CGB) by the city of San Francisco for the second consecutive year, we are committed to supporting the global transition to solar energy.About the TeamWe are transforming the solar sales experience by managing Aurora’s sales narrative platform and financial integrations that enable solar professionals to deliver tailored, homeowner-focused proposals. Our ambitious mission is to empower our customers to articulate value confidently and offer financing options that genuinely meet customer needs.Our team is collaborative and inclusive, believing that shared knowledge leads to superior outcomes. We celebrate achievements, whether launching new features, enhancing existing processes, or developing skills. If you excel in an environment where thoughtful engineering meets impactful work, you’ll thrive here.About the RoleAs a Senior Software Engineer on the Sales Mode team, you will play a pivotal role in advancing systems that drive the clean energy transition. You will enhance our platform, contribute to innovative greenfield initiatives, and advocate for scalable solutions that improve experiences for both solar professionals and homeowners.We seek individuals who are curious, intentional collaborators, and passionate about producing high-quality software that endures the test of scalability. If you are motivated by meaningful challenges and real-world impact, this is your chance to aid in accelerating the adoption of solar energy. This position is hybrid, based in Warsaw, Poland.

Location: Warsaw, Poland About Veeam Software Veeam Software helps organizations understand, secure, and strengthen the resilience of their data and AI systems. With headquarters in Seattle and teams in more than 30 countries, Veeam supports over 550,000 customers worldwide. The company focuses on data resilience and security posture management, operating where identity, data, security, and AI risk intersect. Role Overview The Senior Security Engineer will lead the design and development of authentication and authorization architecture for Veeam Data Cloud (VDC), a cloud-native SaaS platform. This position centers on evaluating, defining, and improving the authorization model, including Role-Based Access Control (RBAC) and other advanced security controls.

Location: Warsaw, Poland Company: Veeam Software About Veeam Software Veeam leads in data management and AI trust, helping organizations understand, secure, and strengthen their data. Headquartered in Seattle with teams in over 30 countries, Veeam protects the operations of more than 550,000 clients worldwide. The company focuses on keeping businesses running smoothly and enabling the safe, rapid adoption of AI at scale. Role Overview The Senior Data Security and Privacy Engineer will focus on implementing privacy-by-design principles and building strong data protection strategies for the Veeam Data Cloud (VDC) data plane. This position plays a critical role in upholding high standards for data security and privacy, helping to maintain client trust in Veeam's solutions.

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.

Join HelloFresh in Warsaw as part of our HelloTech organization, a vital segment of our global technology team comprising over 1000 professionals. We are dedicated to developing digital products that enhance the end-to-end food experience, encompassing meal kits, ready-to-eat meals, and even specialty items like pet food and premium meat & seafood. Our technology platforms empower millions of customers with personalized food solutions every month.Our direct-to-consumer subscription model is fueled by cutting-edge technology that optimizes every customer interaction—from engaging applications and personalization algorithms to pricing strategies and supply chain management. Although our brands operate independently to cater to diverse customer needs, they are unified by shared platforms, data, and operational excellence crafted by HelloTech.At HelloTech, we work in autonomous, cross-functional teams that take ownership of specific products and domains. By collaborating with our Warsaw office, you will contribute to scalable, data-driven products used across various markets, leveraging a modern tech stack and working with international teams to continuously enhance how our customers discover, order, and enjoy HelloFresh products now and in the future.

Company Overview:Twisto, a Param Company, is a forward-thinking financial services provider revolutionizing payment methods in Central and Eastern Europe. Our innovative app empowers users with complete control over their financial transactions, enabling them to defer or split purchases, share expenses, pay invoices, and shop using both virtual and physical cards. We are committed to providing transparency, convenience, and competitive exchange rates both locally and globally. Our mission is to continuously innovate and expand our offerings to simplify everyday financial tasks for our customers.Your Future Responsibilities:We are seeking a dedicated Python Engineer to join our dynamic team! In this role, you will collaborate with Engineering Managers, Product Analysts/Managers, and fellow engineers to enhance user stories, define requirements, and assist in prioritizing and executing tasks throughout the software development life cycle.Key Responsibilities:Design, develop, and maintain Python applications with an emphasis on writing clean, reliable, and maintainable code.Transform business requirements into viable technical solutions.Implement new features, conduct code reviews, provide technical support, and resolve bugs.Contribute to system architecture design and ensure that technical documentation remains current.Engage actively in code reviews and promote high engineering standards within the team.Effectively communicate with stakeholders and team members regarding technical solutions and project updates, both verbally and in writing.Our technology stack is constantly evolving, but currently includes the following tools: Languages: Python.Tools: Kubernetes, Terraform, Docker, AWS Cloud, Grafana, Firebase.Methodologies: Agile, Scrum; we operate on 14-day sprints, with stand-ups conducted online via Slack.

CoreWeave, the essential cloud for AI™, is built by pioneers for pioneers. We provide a robust platform of technology, tools, and teams that empower innovators to confidently build and scale AI solutions. Trusted by top AI labs, startups, and global enterprises, CoreWeave combines exceptional infrastructure performance with extensive technical expertise to accelerate innovation and transform computing capabilities. Since our establishment in 2017, we have become a publicly traded company (Nasdaq: CRWV) as of March 2025. Discover more at www.coreweave.com.We are proud to be recognized as a Living Wage accredited employer.

Join our dynamic Product Security team as a Senior Platform Security Engineer, where your expertise will be crucial in safeguarding our platform that supports multiple products and handles sensitive, high-value information. With our operations expanding, we seek two professionals to strengthen our security efforts.Your role will involve hands-on engineering, where you will design, build, and deploy robust security and privacy controls. This is not about merely defining policies; you will actively contribute to the security architecture of our systems.Your responsibilities will include enhancing supply-chain security through SAST, SCA, container scanning, and CI/CD hardening. Expect a varied role that will challenge you across multiple domains without confining you to a single specialty.What Success Looks Like:Within 90 days, you will have implemented significant, production-level security enhancements.You will take ownership of components of the AuthN/AuthZ model and its execution.You will develop a comprehensive understanding of our data flows and associated privacy risks.Establish yourself as a trusted advisor across teams, able to confidently voice concerns and provide rationale.Effectively reduce risk through practical measures rather than superficial security actions.Your Work Style:This role offers a high degree of autonomy, encouraging you to identify and address issues independently.You will collaborate closely with engineers from different teams, fostering a culture of teamwork.Engaging in constructive disagreements is encouraged, with decisions rooted in data and threat modeling.You will have the authority to block releases on security or privacy grounds when necessary, following clear escalation paths.Proactively addressing problems, even beyond your immediate area, is expected.

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.

Join Euronet Worldwide, a leader in electronic payments and transaction processing, as a Financial Analyst. In this role, you will play a critical part in analyzing financial data, preparing reports, and supporting strategic decision-making processes. This is an exciting opportunity to contribute to the financial health of a dynamic and growing organization.

Join Fairmarkit as a Senior Frontend Engineer and be a key player in revolutionizing the procurement process. You will design and implement user-centric web applications that elevate the user experience. Collaborate with cross-functional teams to create scalable and maintainable solutions while ensuring high performance and responsiveness.

Join Hostinger as a Pricing Manager and play a pivotal role in shaping our pricing strategies. You will work alongside a dynamic team to analyze market data, set competitive prices, and enhance our revenue models. Your insights will drive our pricing decisions, ensuring we remain competitive while maximizing profitability.