Software Engineer (Full-Stack Developer)
Tungthanasin Co., Ltd. (Easy Money — pawnshop/lending business)
- Lead Frontend developer of the company's new core pawnshop transaction system — an internal operational platform used daily by branch staff across 100 branches in 33 provinces, handling an average of 1,500–2,000 transactions per branch per month (~150,000–200,000 transactions/month system-wide). Covers the full financial transaction flow: asset appraisal, price quotation, pawn/redeem/interest renewal, asset management, payments, and user permission management.
- Designed and built real-time communication via Socket events, connecting screens and devices at branch counters, supporting concurrent use across branches nationwide.
- Built an HR-KPI system end-to-end single-handedly — database design, backend, and frontend through to production delivery — demonstrating full ownership from concept to production.
- Developed a Competitor Tracking system integrated with Google Maps API — plotting competitor locations for every branch, analyzing proximity within configurable radiuses, and generating reports that support management's strategic decisions.
- Remediated 100% of security vulnerabilities from penetration test reports, including Clickjacking, SQL Injection, OTP Brute Force, and file upload vulnerabilities.
- Designed a shared metadata schema used across multiple systems, standardizing data structures for reuse and reducing duplicated work across the team.
- Transformed the nationwide repair-request process from email-based workflows into an automated system built with AppSheet + Google Apps Script + Google Sheets, with Line Notify alerts and full status tracking, deployed to all branches — an example of choosing pragmatic tools that fit the problem instead of over-engineering.
- Maintain and develop features across multiple systems in parallel (Backoffice, Backend, POS).