Staff Rust Developer

.txt builds structured generation: we make language models produce output that follows a given format, by deciding at every decoding step which tokens are allowed. We compile a JSON Schema, a regex, a grammar, a list of function definitions or a policy into that decision, fast enough to run inside the decoding loop. This is how .txt builds reliable and safe agents. We're looking for a developer to work on the parsers and compilers at the center of it. The Role .txt builds structured generation: we make language models produce output that follows a given format, by deciding at every decoding step which tokens are allowed. We compile a JSON Schema, a regex, a grammar, a list of function definitions or a policy into that decision, fast enough to run inside the decoding loop. This is how .txt builds reliable and safe agents. We're looking for a Rust developer to own the part of it that has to be fast: the automata, indexes and parsers that run at every decoding step. You'd turn what the rest of the team writes into production-ready Rust, with the Python bindings and C++/CUDA glue to put it inside an inference engine, and the benchmarks to prove it stays fast. What You Will Do - Project Leadership: Initiate and drive the development of mission-critical Rust projects from conception through deployment. - Performance Engineering: Write and optimize parsing code with a strong emphasis on performance, supported by automated benchmarking. - Data Structures & Algorithms: Ability to design, implement, and readily debug formal grammars, efficient parsers, standard and non-standard automata, and general text-based indexing/search. - Cross-Functional Collaboration: Work with other teams to integration their work into production-ready Rust. - Tooling & CI/CD: Utilize advanced profiling, debugging, and continuous integration tools to maintain and enhance code quality in non-trivial and consistent ways. About You - Proven Rust Experience: Demonstrated ability to lead and contribute to sophisticated, collaborative Rust projects. - Professional Development Skills: A track record of developing well-tested, high-performance software. - Tooling Expertise: Expertise with code profiling and debugging. Experience with automated workflows in CI. - Multi-language Proficiency: Ability to learn and/or work with the following technologies: CUDA, C/C++, Rust/Python bindings. - A Collaborative Mindset: Excellent communication skills and a proactive approach, ideally suited for an early-stage startup culture. Why You Should Join Us: - The problem matters Every agent that takes real actions needs a layer that guarantees it can only do what it was asked. The parser and compiler work in this role is what enables this guarantee. - Remote first Work from anywhere in the world. We communicate mostly in writing and favor occasional organic discussions over recurring large team meetings. - Competitive compensation and benefits Market-rate salary plus stock options, health and dental insurance, and a 401(k) for US employees. We'll also get you a GPU if you don't have one. - Location .txt is a fully remote company with the majority of the team in the US and EU. To facilitate real-time collaboration, we require team members to be available, on a daily basis, for at least 3 hours of overlap with morning New York City ( Eastern Time Zone ) business hours, 8am - 1pm. Applying Please provide a 1-page resume in English. Only apply to one position at a time.