Kotlin/Java Internal Tools Developer

Planner 5D; Amsterdam; On-site; EUR 55,000 - 75,000; Full time

Benefits offered by this job

30+ days of paid holidays

Education courses funding

Unlimited free Planner5D subscriptions

Job summary

Planner 5D in Amsterdam is seeking a Java/Kotlin Engineer to develop tools and pipelines related to AI, rendering, and data conversion.

Your role will include maintaining Kotlin/JVM-based backend tools and supporting Python-based Blender rendering workflows. Experience with both Java and Kotlin, plus a solid understanding of SQL databases, is essential. The position offers a collaborative environment with over 30 days of paid holidays annually.

Qualifications

• Strong experience with Java and/or Kotlin on JVM.
• Practical experience with Python and Blender rendering pipelines.
• Good understanding of SQL databases like SQLite and MySQL.

Responsibilities

• Develop and maintain Kotlin/JVM-based backend tools.
• Support Python-based Blender rendering pipelines.
• Research technologies related to 3D and rendering.

Skills

Java/Kotlin experience

Python experience

SQL knowledge

Object-oriented programming

Fluent in English

Tools

Gradle

Blender

Docker

Kubernetes

Job description

About us

Planner 5D is a global hub for home design, uniting over 100+ 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. 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.

Our cross‑platform presence

Our cross‑platform presence spans Web, iOS, Android, Windows, and MacOS, 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.

Talent we seek

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 Java/Kotlin 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

• 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

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

What we offer

• Great work environment that balances freedom and responsibility
• Our team is made up of friendly and passionate enthusiasts who are eager to help and share their knowledge
• We believe in work‑life balance, so you'll receive around 30+ days of paid holidays per year
• Company computer equipment by request
• Education courses for our team members, and we're willing to allocate funds toward your training expenses
• English classes on our corporate platform
• Offline company events in Lithuania and online team‑building
• Unlimited free Planner5D subscriptions