Kotlin/Java Internal Tools Developer

Job description

**About us:** **Planner 5D** is a global hub for home design, uniting over 90+ million users in 230 territories around our planet (yes, we have 2 users connecting from Antarctica each month!). Our platform simplifies the home renovation process from concept to execution, and this process has never been more straightforward with our [cutting-edge software](https://tool.planner5d.com/about-us-2023). You don't need to be a professional designer to enhance your home or workspace. We are dedicated to streamlining the design experience, making the customization of dream homes [accessible to everyone](https://planner5d.com/interior-design-courses). Our cross-platform presence spans [Web](https://planner5d.com/), [iOS](https://apps.apple.com/us/app/planner-5d-room-house-design/id606173978?planner5d=1), [Android](https://play.google.com/store/apps/details?id=com.planner5d.planner5d&planner5d=1), [Windows](https://apps.microsoft.com/detail/9NBLGGH4MP71?activetab=pivot:overviewtab&hl=en-us&gl=US), and [MacOS](https://apps.apple.com/us/app/planner-5d-interior-design/id1310584536?pt=2019088), ensuring seamless synchronization for our users. Planner 5D is more than just software; it's a vibrant community of enthusiastic and product-oriented professionals. From diverse backgrounds, our team collaborates across time zones, fueled by a shared passion to revolutionize the home design market. We are constantly looking for like-minded talent eager to take ownership and drive innovation within our expanding suite of tools. Join us in shaping the future of home design. We’re looking for a **Kotlin/Java Engineer** who will develop tools and pipelines related to AI, rendering, data conversion, and similar areas. Our tech stack: - **Languages**: Kotlin, Python - **Core development:** Kotlin/JVM, Java, coroutines, serialization, reflection, dependency injection with Dagger - **3D and rendering workflows:** Blender Python scripting, glTF processing, 3D model conversion, geometry/math-related tooling, scene and asset preparation pipelines - **Data and storage:** MongoDB, SQLite, FlatBuffers - **Infrastructure and observability:** Prometheus metrics, Sentry, CI/CD, Git, Git LFS, internal monitoring and logging ### Responsibilities: - Develop and maintain Kotlin/JVM-based backend tools, console applications, utilities, and automation pipelines; - Develop and support Python-based Blender rendering pipelines, including scene processing, automation and production rendering workflows; - Work on platform components for preparing catalogs, launching processing pipelines, converting 3D models, and supporting internal production workflows; - Build and maintain tooling related to 3D content processing, geometry, scene preparation, wall generation, model conversion, and other math-heavy tasks; - Research and evaluate current and upcoming technologies related to 3D, rendering, media formats, data processing, and production automation; - Write maintainable, high-performance, and high-quality code using best practices, SOLID principles, automated tests, code reviews, and clean architecture. ### Required knowledge of: - 6+ years of experience with **Java** and/or **Kotlin** on JVM; - Practical experience with **Python**, willingness to work deeply with Python-based Blender rendering pipelines; - Good understanding of JVM ecosystem: Gradle, dependency management, modular code structure, debugging, profiling, logging, and performance optimization; - Solid SQL knowledge (SQLite, MySQL, PostgreSQL); - Good understanding of object-oriented programming, SOLID principles, clean architecture, and maintainable code design; - Ability to work with math-heavy, data-heavy, or algorithmic tasks and turn them into stable production solutions; - Ability to write clean, reliable, high-performance code and cover critical logic with tests; - Knowledge of Linux, common tools, and Linux ecosystem; - Fluent in English. ### Nice to have: - Experience with Python, C / C++ languages; - Experience with popular libraries like Spring, Dagger, JUnit, Apache Commons; - Understanding of 2D / 3D technologies and software (for example OpenGL, WebGL, Raytracing, Blender); - Understanding of Mathematics, Geometry, Computer Vision; - Understanding of Kubernetes, Docker and nearby technologies. ### Several example of tasks you will be doing: - Process data from APIs, databases, JSON, XML, and other sources; - Transform assets (images, 3D models, videos, etc.) into different formats; - Import and export of 2D/3D data from and to .dxf/.dwg/.blend formats; - Write a Blender plugin to load data and provide additional modeling functionality; - Write high performance code using CPU and GPU to the max (using parallel, concurrent programming like coroutines, threads, Rx, promises, futures, etc.); - Build processing pipelines, where multiple threads are used to max out CPUs and do lots of different processing on multiple threads/coroutines/Rx/java streams/etc.