We are looking for a highly motivated Open Source Senior Java Engineer to join Voltron Data’s team. On the team, you’ll have the opportunity to help support and grow an open source project used by hundreds of companies worldwide. You will work closely with the Voltron Data team and the Substrait and Apache Arrow communities to help evolve the Apache Arrow framework and the Substrait libraries for Java. You will also get directly involved with the community by managing GitHub Pull Requests, issues and StackOverflow questions.

Why work at Voltron Data?

  • We are Going for Impact: We are a Series A, venture-backed startup assembling a global team to design next-generation data systems, creating a new foundation for data processing built on composable open standards, with Theseus, our GPU query engine for petabyte-scale ETL, harnessing the speed and efficiency of modern hardware.
  • We are Committed to Bridging Open Source Communities: We are a collection of open source maintainers who have been driving open source ecosystems over the last 15 years, particularly in the C++, Python, and R programming ecosystems.
  • We are Building a Diverse, Inclusive Company: We are creating a representative, equitable, and respectful workplace that prioritizes employee growth. Everyone at Voltron Data is bought into the company’s success; all voices are critical to shaping the organization’s future.

You will be doing some or all of the following:

  • Improving Apache Arrow and Substrait ease of use for Java developers
  • Enhancing library quality and reliability
  • Enhancing library internals and APIs to improve ease and efficiency of development
  • Answering user tickets (bugs, feature requests), helping contributors, reviewing Pull Requests
  • Writing prose documentation, tutorials, etc.
  • Developing new features to better address users' needs
  • Spreading Apache Arrow awareness by authoring blog posts and attending conferences


  • Significant Java experience
  • Prior experience in Data Engineering and/or Data Science fields
  • Ideally, you are familiar with one or several of the following…
    • Open source development practices and social dynamics
    • Build systems, continuous integration
    • Binary protocols, binary representation issues
    • Low-level memory management in Java
    • Bridging Java with foreign runtimes
    • Performance optimization
    • Another language with a significant share in the Arrow ecosystem, such as C++, Python, R or Rust
Voltron Data

Voltron Data