Lead Java Developer (e-commerce)

Development of an e-commerce project for a client that is one of the largest companies in this sector in the country. Our expectations Proven track record of leading development teams, including people management, project execution, and predictable delivery. Min. 5 years of experience as Java Developer Knowledge and experience with Java Ecosystem - Java, Kotlin, Groovy, Spring Framework, and other languages - Python, Go Experience with Apache Spark, Apache Hadoop , Apache Mesos and TensorFlow Knowledge of engineering practices & methodologies: TDD, DDD, CI/CD, Pair Programming Strong sense of ownership: full accountability for outcomes, quality, and system reliability. Strong hands-on engineering background with the ability to co-drive technical decisions, conduct code reviews, and design system architecture. Commitment to engineering excellence (clean code, testing, code reviews, CI/CD, and production readiness). Participation in product discovery as a key technical partner. Ability to translate business goals into a clear scope of work, priorities, and actionable roadmaps. Experience working in a cross-functional environment (Product, UX, Business). Proven track record in mobile app development Documented experience in AI-driven projects and OKR frameworks Experience in e-commerce, marketplaces, or consumer-facing platforms Excellent communication skills. Advanced communication skillis both in Polish and English (at least B2 level). Open to hybrid work from the client's Warsaw office. Main responsibilities Lead a cross-functional development team, drive architectural decisions, conduct code reviews, and maintain engineering excellence across mobile, e-commerce, or consumer-facing platforms. Partner with Product, UX, and Business stakeholders during product discovery to translate strategic business goals and OKRs into actionable technical roadmaps and AI-driven solutions. Take full accountability for end-to-end project delivery, quality, and system reliability while effectively managing team members and working in a hybrid setup from the client's Warsaw office.