Java/Kotlin Internal Tools Developer

Planner 5D; Portugal; Remote; EUR 48,000 - 70,000; Full time

Job summary

Planner 5D is seeking a Java/Kotlin Engineer to develop tools and pipelines for AI, rendering, data conversion, and related areas. The role focuses on Kotlin/JVM backend tooling, Python-based Blender rendering pipelines, and platform components for catalogs and production workflows.

You will work on 3D content processing, geometry, scene preparation, and math-heavy tasks, delivering high-performance, well-tested code in a collaborative environment.

Qualifications

• Strong experience with Java and 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.

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.

Skills

Java/Kotlin on JVM

Python

English fluency

Tools

Dagger

JUnit

Spring

Blender

Job description

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 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.

Originally posted on Himalayas