József Sallai is a software engineer with nine years of experience building fast, secure, and scalable web and mobile systems across Node.js, Go, Python, and modern frontend frameworks like React, Vue, and Svelte. He has led engineering efforts as CTO at an AI startup—shipping a Flutter app, deploying image-generation and LLM models, and architecting metered B2B billing and NestJS microservices. His background spans full-stack product work from Django REST and WebSocket gateways to Next.js frontends, with a practical eye for UX-driven design and pixel-perfect implementations. An active open-source contributor, he improved UI and game-logic features for a faithful Rust remake of Cave Story, showing a knack for both systems and user-facing polish. Based in Mureș, Romania, József combines early product localization and support experience with a strong emphasis on security and efficiency when turning prototypes into production. He’s known for pragmatic architecture choices that balance developer velocity with long-term maintainability.
9 years of coding experience
10 years of employment as a software developer
Information Technology, Information Technology at Bolyai Farkas High School
Bachelor of Science - BS, Computer and Information Sciences, General, Bachelor of Science - BS, Computer and Information Sciences, General at Sapientia EMTE
A faithful and open-source remake of Cave Story's engine written in Rust
Role in this project:
Back-end Developer
Contributions:14 reviews, 83 commits, 28 PRs in 11 months
Contributions summary:József contributed to the core engine of a Cave Story remake, written in Rust. Their primary focus was on improving the user interface and enhancing menu functionality, specifically focusing on the soundtrack and save selection menus. They also implemented features related to in-game difficulty settings and fixing issues related to challenge completion, indicating a focus on game logic and user experience.
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