# Yong Sen Yeoh
**Full-Stack Developer | Software Engineer**

📍 Penang, Malaysia  
📧 yeohyongsen@gmail.com | 📱 +60 13-481 1808  

🔗 LinkedIn: https://www.linkedin.com/in/yong-sen-yeoh-035253220/  
💻 GitHub: https://github.com/YsYeoh  
🌐 Portfolio: https://www.yongsen.space/

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## Professional Summary

Software Engineer with 5+ years of experience building scalable web applications and transforming business workflows into digital systems. Skilled in Next.js, React, Node.js, and AWS cloud deployment. Experienced in integrating third-party services and recently focused on AI applications (RAG, LLMs, vector databases). Strong problem solver and fast learner with a track record of delivering practical, high-impact solutions.

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## Professional Experience

### Technical Lead  
**Whatif Solutions**  
Jan 2025 – Present | Penang, Malaysia  

- Lead and mentor developers, improving code quality and team capability  
- Design scalable architectures and reusable components  
- Establish coding standards and drive technical decisions  
- Architect modular systems enabling tenants to access multiple apps via a unified dashboard  
- Implement shared data architecture with tenant isolation  
- Develop an AI-powered agent for natural-language data retrieval and analysis  
- Design LLM tool-calling workflows for intelligent system interaction  
- Mentor developers and enforce coding and architectural best practices  

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### Software Engineer  
**Whatif Solutions**  
Aug 2023 – Aug 2025 | Penang, Malaysia  

- Develop full-stack applications using Next.js, React, and Node.js  
- Build and maintain RESTful APIs; integrate payment gateways, WhatsApp, and SMS APIs  
- Manage databases and improve system performance  

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### Software Engineer Intern  
**Finexus Group**  
Feb 2023 – Aug 2023 | Malaysia  

- Research database migration and build migration tooling (MSSQL → PostgreSQL/MariaDB)  
- Build Java validation tooling to ensure data integrity  
- Work with Spring Boot and related backend patterns  

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## Key Projects

### Multi-Tenant Business Platform (Marketplace System)

- Platform enabling businesses to create tenants and subscribe to multiple internal applications  
- Centralized landing and access within a unified ecosystem  
- Cross-tenant user access with role-based permissions (IAM)  
- Shared services architecture for data consistency across applications  
- Next.js and React monorepo architecture  

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### DocuFill – Document Automation Platform

- Automated Word document generation with dynamic templates  
- Batch processing and cloud storage integration  

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## Technical Skills

**Frontend:** React.js, Next.js, HTML, CSS, JavaScript  
**Backend:** Node.js, REST APIs  
**Databases:** MongoDB, PostgreSQL, MySQL  
**Cloud & DevOps:** AWS (EC2, S3, VPC), Nginx, PM2, CI/CD  
**Programming:** JavaScript, Python, Java, C++, SQL  
**Tools:** GitHub, GitLab  

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## Education

**Bachelor’s in Software Engineering (Distinction)** — TARUMT (Tunku Abdul Rahman University of Management and Technology)  
April 2021 – Aug 2023  
Dean’s List (2022) | President’s List (2021)  

**Diploma in Computer Science (Distinction)** — TARUMT  
March 2019 – March 2021  

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## Strengths

- Strong problem-solving and research skills  
- Fast learner with high adaptability  
- Ability to translate business needs into technical solutions  
- Passionate about building impactful systems