Kotlin/Java Internal Tools Developer

Planner 5D; Madrid; Presencial; EUR 40.000 - 60.000; Jornada completa

Descripción de la vacante

Planner 5D is seeking a skilled Java/Kotlin Engineer in Madrid to develop tools related to AI and rendering. The ideal candidate will create Kotlin/JVM-based backend tools and implement Python-based Blender rendering solutions.

Candidates should have strong Java and Kotlin experience, along with good SQL knowledge and an understanding of JVM principles. Additional knowledge of 2D/3D technologies is a plus. The position offers opportunities for research and technology evaluation in a dynamic environment.

Formación

• Strong experience with Java and/or Kotlin on JVM.
• Practical experience with Python, particularly in Blender rendering pipelines.
• Good understanding of the JVM ecosystem and performance optimization.

Responsabilidades

• Develop and maintain Kotlin/JVM-based backend tools and automation pipelines.
• Support Python-based Blender rendering pipelines.
• Build tooling related to 3D content processing and geometry.

Conocimientos

Java

Kotlin

Python

SQL

Linux

Herramientas

Blender

Gradle

Docker

Descripción del empleo

We’re looking for a Java/Kotlin Engineer who will develop tools and pipelines related to AI, rendering, data conversion, and similar areas.

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

• Strong 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.

Examples of Tasks

• 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.