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ธีรธร รักษาเมือง

@0009048

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Full Stack Developer at ODT building IFS SmartHRS payroll and authorization systems for 30,000+ employees.

Thailand

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What I'm looking for

I'm open to Full-Stack, Backend and Software Engineering roles, including opportunities using technologies beyond Ruby on Rails.

At ODT, I work on IFS SmartHRS, an enterprise HR and payroll platform used by more than 30,000 employees. I designed and built its core payroll calculations, covering proration, overtime, social security and withholding tax.

I also built payroll and tax reports, including PND.1, and contributed to a mobile attendance app with face verification and offline support. For authorization, I designed and built a centralized service with JWT authentication, permission caching and outage fallback.

On ODT's internal platform, I built skill-based people search and designed the equipment lending data model. I care about well-structured, reliable systems, and I'm open to Full-Stack, Backend and Software Engineering roles with other technologies as well.

Experience

Work history, roles, and key accomplishments

Current

Full Stack Developer – IFS SmartHRS

Current

ODT

Mar 2026 - Present (8 months)

Client: IFS Facility Services Co., Ltd. Enterprise HR and payroll platform used by more than 30,000 employees.

• Core payroll engine: designed and built the core payroll calculation, covering individual wages, overtime, proration for employees who join, resign or move between sites mid-month, social security and withholding tax, with logic split into tested services.
• Tax & payroll reports: buil

Full Stack Developer – ODT Internal Engagement

ODT

Dec 2025 - Mar 2026 (3 months)

Internal platform for managing the company's people and equipment.

• Skill-based people search: built company-wide search by skill and level with skill profiles, a CSV skill importer that normalizes skill names, and infinite scroll that cancels stale requests so results stay accurate.
• Company equipment: designed the equipment and lending data model end to end, with real-time availability.
• Qua

Full Stack Developer – ODT External Engagement

ODT

Sep 2025 - Dec 2025 (3 months)

ODT's main corporate website.

• Corporate website: built a responsive bilingual (Thai/English) site, including navigation, multi-layer carousels, and company, product and blog pages, as reusable components.
• Analytics & PDPA: set up visitor analytics (GA4, Microsoft Clarity) that load only after PDPA consent, under a Content Security Policy, with site-wide event tracking to measure user behavior