Full Stack Engineer

Full Stack Engineer — Internal Tools & Web Location: Brooklyn, NY or remote Mathpix is looking for a Full Stack Engineer to own the internal tools and web surfaces our team and customers rely on every day. This is high-leverage work. You'll own Zenpix, the internal platform where our annotation and ML teams direct, review, and measure the data that trains our models, and you'll build on console-web, the app our cloud customers use to manage their accounts. The quality of these surfaces shapes both how fast our researchers move and how our customers experience the product — so the person in this seat frees up some of our most senior people to focus on the hardest problems. We care more about how you think than what's on your resume, but this is a role for someone who has already shipped real web applications and is ready to own meaningful surfaces with minimal direction. You'll work across a React/TypeScript and Python/PostgreSQL stack, collaborate closely with ML researchers and the data team, and take projects from design through deployment. Responsibilities: Own features in Zenpix — our internal annotation editors, dashboards, and data tooling (React/TypeScript + Python/Flask, PostgreSQL) — the high-leverage platform our data and ML teams depend on Build and improve console-web, the web app cloud customers use to manage API keys, usage, and billing Own data-team tooling: annotation queue creation, synthetic-data generation, and validation dashboards that keep our training-data pipeline moving Run QA across our Snip apps and web surfaces for release, so release readiness doesn't rest on a single person Take projects end-to-end, from design through deployment and monitoring, and partner with ML researchers so their time goes to models, not tooling Required skills: A few years building and shipping full-stack web applications Strong with React/TypeScript on the front end and Python on the back end Comfortable with SQL and relational databases (PostgreSQL) A self-starter who owns outcomes end-to-end and collaborates well Genuine care for the quality and usability of tools other people depend on Nice to have: Experience building internal tools, dashboards, or data-annotation/labeling interfaces Exposure to ML workflows or PyTorch (you'll work alongside our research team) QA / release-testing experience for web or desktop apps Familiarity with Flask, WebSockets, or Docker Contributions outside of work — personal projects, open-source, articles, or blog posts If you believe you would be a good fit for this role, please apply using the link below. https://mathpix.com/careers/apply