> Markdown version of [/jobs/ext/4710354-senior-mod-developer](https://www.wearedevelopers.com/jobs/ext/4710354-senior-mod-developer). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md).

---

# Senior Mod Developer

- **Company:** Spark Universe
- **Location:** Hamburg, Germany (Remote available)
- **Experience:** Expert
- **Salary:** €46,790 - €53,809
- **Contract:** Temporary contract
- **Skills:** Java (Programming Language), JIRA, Code Review, Computer Programming, Continuous Integration, Software Debugging, Github, Integrated Development Environments, Python (Programming Language), Pair Programming, Software Engineering, Minecraft, Kotlin, Git Flow, Asynchronous Programming
- **Published:** November 14, 2026
- **Apply:** https://www.adzuna.de/details/5964809822

## About the Role

Prior experience in a software engineering team.

 - Strong programming experience with Java and Kotlin.

 - Experience building complex user-facing applications.

 - Experience mentoring other developers and giving code reviews.

 - Ability to navigate ambiguity, investigate unfamiliar systems, and make technical decisions with confidence.

 - Clear communication skills, with the ability to clearly articulate technical concepts and collaborate effectively across teams.

 - Comfortable with Git-based workflows and project management tools such as Linear or Jira (we use Linear).

 - Bonus: Experience with Minecraft modding or Mixin.

 - Bonus: Experience with Kotlin coroutines and asynchronous programming.

 - Bonus: Experience with CI/CD (we use GitHub Actions) and Python.

## Description

Take ownership of the development of core systems and features.

 - Review project specifications and designs with a critical eye, and collaborate with our product and design team to refine them.

 - Mentor junior and mid-level developers by guiding them towards solutions, getting involved in pair programming, and knowledge sharing.

 - Work around undocumented or changing platform behavior, including reconciling differences between a wide range of Minecraft versions.

 - Review code from team members with an emphasis on correctness and cross-version compatibility.

 - Improve how the team works as a whole by contributing towards internal tooling, code standards, and development processes.

Within 1 month, you will...

 - Complete onboarding and gain understanding of our values, and product development process.

 - Learn our internal workflows, development environment setup, and best practices.

 - Build strong working relationships with other developers, your Engineering Lead, and other team members to ensure efficient collaboration.

Within 3 months, you will...

 - Ship your first significant feature end-to-end.

 - Become a regular code reviewer, focusing on correctness and compatibility across the Minecraft versions we support.

 - Be comfortable debugging and writing Mixins in our codebase, focusing on compatibility with future Minecraft updates and other mods.

 - Start supporting less experienced team members through pair programming and walking them through difficult problems.

Within 6 months, you will...

 - Own a large feature or system within Essential and be the go-to person for it.

 - Lead a migration to a new Minecraft version.

 - Be someone that team members go to when they are stuck and help them grow the skills to solve problems on their own.

 - Identify areas of the codebase that need attention and lead efforts to improve them.