Java / Kotlin Developer (SEO Apps)

Expected, Java, Kotlin, MongoDB, Scala, Spark, Google Cloud Platform Optional, Spring Framework About the project, Looking for your next challenge as a Java/Kotlin Developer? We may have the right opportunity for you. Your responsibilities, Backend microservices development - designing and maintaining Kotlin/JVM microservices supporting SEO functionalities on a marketplace platform (listings, offer pages, search results, archives) at a scale of tens of millions of users, Big data & trend prediction - writing and optimising Spark/Scala jobs on large datasets (terabytes) in a GCP environment; participation in a search trend prediction project, SEO systems & internal linking development - sitemap generation, development of the internal link exchange system, optimisation of pages for bots and AI agents, daily collaboration with the business SEO team Kotlin (JVM) + Java 17 - ability to work independently in the JVM ecosystem, MongoDB, Scala + Spark, GCP (Google Cloud Platform), Production issue diagnosis - monitoring analysis, identifying bottlenecks and their root causes, Collaboration with business stakeholders - active participation in requirements gathering, daily communication, Polish (native) + English (B2+), Ability to perform work in Poland (citizenship, residence permit, visa, etc.) Optional, Spring Framework, SEO domain knowledge This is how we work, in house, you focus on a single project at a time, you have influence on the technological solutions applied, scrum Development opportunities we offer, substantive support from technological leaders What we offer, Work in a Scandinavian culture built on logic, trust, and open dialogue., Health and sports benefits tailored to your needs., Speed Coaching – short sessions designed to provide new perspectives and solutions., Sports training, an internal team, and opportunities to take part in competitions. Benefits, sharing the costs of sports activities, private medical care, sharing the costs of foreign language classes, sharing the costs of professional training & courses, flexible working time, integration events, corporate sports team, corporate library, video games at work, coffee / tea, leisure zone, christmas gifts, birthday celebration, employee referral program, charity initiatives Recruitment stages, Phone Interview with a Recruiter, In-Depth Online Interview, Online Meeting with the Project Leader, Decision B3 CONSULTING POLAND sp. z o.o., At B3, we start with people and their experience. We match projects to your skills and professional growth path. Our consultants work across a wide range of industries and technologies, delivering IT projects both in Poland and internationally. This allows you to build your career in a deliberate way - not by chance., , We are part of an international organization listed on Nasdaq Stockholm, operating in 11 countries. In Poland, we operate with full autonomy. We choose our technologies, processes, and ways of working while maintaining the highest professional standards.