Building Production-Grade Full-Stack Web Systems: An Industry Internship Experience with Elysia, Bun, TypeORM, and Next.js
Building Production-Grade Full-Stack Web Systems: An Industry Internship Experience with Elysia, Bun, TypeORM, and Next.js
Authors:
Dhruv Jangid1
1Department of Computer Science and Engineering, Parul Institute of Technology, Parul University
Abstract - This paper presents the technical work carried out during a sixteen-week industry internship at Ascendtis IT Solutions, a software services company based in Vadodara, Gujarat, from January to April 2025. The internship involved active contribution to four client-facing software engineering projects spanning full-stack web development, complex system design, automation scripting, and self-hosted email infrastructure. The core technology stack comprised Elysia and Bun on the backend, TypeORM with MySQL for data persistence, and Next.js with Tailwind CSS on the frontend. The four substantive projects were: (1) Battuta Trips, a full-stack tour booking platform; (2) a comprehensive system design for a Passport Issuance Workflow incorporating finite state machines, role-based access control, and appointment slot management; (3) a fault-tolerant web scraping automation script for the Swapcard platform with cursor-based resumption; and (4) an Email Service API providing self-hosted campaign management, SMTP delivery, open and click tracking, bounce handling, and unsubscribe flows. The paper documents the architectural decisions, implementation approaches, and engineering observations from each project, with particular emphasis on type-safe API design using Elysia and TypeBox, normalized relational schema design, and reliability engineering patterns applied in production contexts.
Key Words: Elysia, Bun, TypeORM, Next.js, Full-Stack Web Development, REST API, Relational Database Design, Finite State Machine, Email Infrastructure, Web Scraping, TypeScript, MySQL