Founding RL Research Engineer - Hybrid Europe + Equity

Built Different is seeking a Founding Junior RL Engineer/Researcher for a hybrid role in Paris, Amsterdam, or London, with some remote options. The position offers €120,000 plus founding equity and the chance to work with frontier AI labs and paying clients from day one.

You’ve built or explored RL environments or training infrastructure at a serious AI company, think in first principles, and move fast. Join a founding team shaping long-horizon AI tasks.