Staff Rust Developer

Job description

[.txt](https://dottxt.ai) 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](https://en.wikipedia.org/wiki/Eastern_Time_Zone)) business hours, 8am - 1pm. ## **Applying** Please provide a 1-page resume in English. Only apply to one position at a time.