Company Description: Udext is building the operating system for the frontline workforce - helping organizations communicate, engage, and support employees at scale through SMS-first technology. Role Description: We’re looking for a talented and versatile Senior Full-Stack Engineer to join our core team and help shape the future of the product. As an early engineering hire, you won’t just write code - you’ll help define how the system is built, scaled, and experienced by thousands of users. You’ll work across the entire stack, from backend systems and APIs to frontend product experiences, owning problems end-to-end. This is a high-impact role where your work will directly influence product direction, system architecture, and company growth. Qualifications: Strong knowledge of JavaScript and ECMAScript 6 standards Build and maintain modern, responsive UI using React (Next.js) Develop scalable component architecture and reusable UI libraries Improve user experience and performance across web and mobile interfaces Commercial experience with Node.js. Commercial experience working with high-load SQL or NoSQL databases. Commercial experience implementing REST, GraphQL, and WebSockets Understanding of Test-Driven Development (TDD) principles and experience writing tests Experience with Git version control system. Experience with Redis. Experience with databases such as MongoDB and PostgreSQL Ability to own and lead the backend and frontend architecture domain of the system. Hands-on experience working with AWS Ability to work and communicate in a fast-paced startup environment Preferred Qualifications: Hands-on experience developing with CI/CD pipelines, microservices architecture, and containers. Ability to build and ship projects from scratch independently Entrepreneurial mindset with a strong sense of ownership and initiative Duties and Opportunities: In-house platform development. Third-party API integrations. Actively participate in developing & maintaining new features from scratch. Take ownership of the backend and frontend architecture of the system, shaping its design and implementation.