Full Stack Developer with Java

ING Hubs Poland is hiring! The expected salary for this position: 15 000 - 22 000 PLN gross. The financial ranges specified in the announcement are adjusted and may differ from the range specified in the remuneration regulations. Your Day-to-Day Build and evolve user-facing applications that provide sustainability insights, portfolio steering capabilities and emissions-related decision support. Develop backend services, APIs and integrations that enable the collection, processing and delivery of sustainability-related data. Collaborate closely with Product Owners, UX Engineers, Data Analysts, Data Engineers and business stakeholders to transform complex sustainability requirements into scalable digital products. Contribute to technical design and architectural decisions, ensuring solutions remain scalable, maintainable and aligned with long-term product goals. Support the evolution of the web application landscape as the platform expands across business domains and sustainability sectors. Implement automated testing, monitoring and continuous delivery practices to ensure high-quality software delivery. Improve engineering standards, reduce technical debt and continuously enhance platform reliability and maintainability. Work with data-intensive solutions, visualizations and business workflows that help users understand sustainability performance and climate-transition metrics. Mentor colleagues, share knowledge and contribute to raising the engineering maturity of the team. Actively challenge existing solutions and identify opportunities for continuous improvement across products, processes and technology. Who are we looking for? Bachelor's degree in Computer Science, Software Engineering, Information Technology, Computer Engineering or a related technical discipline (required). Master's degree in a related field is considered a strong advantage. Relevant professional certifications in software engineering, cloud technologies, DevOps or solution architecture are considered a plus. Extensive experience designing, developing and maintaining modern software applications. Strong experience across both front-end and back-end development. Experience building scalable web applications and distributed systems. Strong proficiency in Java, Kotlin or other JVM-based technologies. Experience with modern front-end frameworks and technologies, preferably React and TypeScript. Experience designing and integrating REST APIs and service-based architectures. Strong understanding of software engineering principles, object-oriented design, design patterns and clean code practices. Experience with relational databases and data-driven applications. Experience implementing automated testing strategies and quality assurance practices. Familiarity with CI/CD pipelines and modern software delivery methodologies. Experience working in Agile and multidisciplinary teams. Excellent problem-solving, communication and stakeholder-management skills. Ability to take ownership of complex topics from discovery through implementation and operational support. Demonstrated ability to mentor engineers and positively influence technical decisions. Nice To Have Experience with cloud-native architectures, containerisation and Kubernetes-based platforms. Experience working with data-intensive products, analytics platforms or reporting solutions. Experience building products involving sustainability, ESG, climate or regulatory domains. Familiarity with Azure DevOps or similar engineering toolchains. Experience contributing to technical roadmaps, architecture evolution and platform strategy. Understanding of data engineering concepts, data pipelines and large-scale data processing. Experience working within large, international organisations and cross-border teams. The role naming convention in the global ING job architecture will be “Engineer IV”.