Senior Ruby on Rails Developer

• Sep 2023 - Present

Ruby on Rails/ JavaScript Projects

• Jan 2015 - Present

Mobius360 I designed and developed a streamlined patient list collaboration tool that utilized Nuxt.js for the front-end and Node.js for the back-end. To create an intuitive and user-friendly interface, I developed a rich mobile UI application with TypeScript, Tailwind CSS & HTML5. To ensure efficient development and timely delivery, I implemented Agile methodology with 2-week sprint cycles. The project enabled doctors, nurses, and billing staff to store and share patient data, improving communication and collaboration among team members. Bizmerger (www.bizmerger.com) Designed, developed, and implemented a web-based real estate application for Bizmerger. Streamlined the buying and selling process for all parties involved. Implemented features such as Property Search, Property Listing, Property Viewing, Communication, Transaction management, and Analytics & Reporting. Used Rails 7, Ruby 3.1.0, PostgreSQL, AWS S3, Heroku, Bootstrap Tackling The Tough Talk (T4) I designed and developed T4, a web-based application that serves as a platform for healthcare clinicians to handle real-life scenarios. In this project, I built the entire application from scratch, including the admin and user dashboards. I also developed an interactive presentation module for viewing video, audio, and slideshow presentations. Furthermore, I integrated the Stripe payment gateway to enable users to make payments through the application. The technologies I used for this project include Rails 4.2, Ruby 2.2, PostgreSQL, Heroku, AWS S3, and Stripe. Adminizter Designed and implemented Adminizter, a web-based portal for a non-profit organization. Streamlined member profile management and automated related activities such as payments, billing, and event participation. Conducted membership analysis through a reporting application. Utilized Rails 6.0.3, Ruby 2.6.3, PostgreSQL, AWS S3, Heroku, Bootstrap, and jQuery. Developed an intuitive and user-friendly interface to improve the user experience. Show less

Full Stack Developer

• Jan 2022 - Aug 2023

Part of the development team to develop & maintain a large mortgage-broker platform named “Finance Manager” using Ruby on Rails. • Successfully delivered a range of features for communication, commissions, and tax invoice modules, leveraging Ruby on Rails. • Orchestrated seamless integration of third-party APIs like Creditor Watch (Credit score), GlassGuide (Vehicle) Sypht (Payslip) into the mortgage-brokering system. • Implemented RESTful API endpoints for user authentication and workflow call-backs. • Developed secure Ruby gems to encapsulate third-party API calls, enhancing overall system security. • Collaborated harmoniously with a cross-functional team of developers and product manager to prioritize and punctually deploy new functionalities. • Assumed a pivotal role in code reviews, rectifying bugs, and engaging in pair-programming to ensure code excellence. Show less

Senior Software Developer

• Jul 2021 - Dec 2021

Led the development execution of Loyalty app program needs and existing module enhancements. • Designed, developed, and deployed Rails RESTful API and ActiveAdmin dashboard for the Loyalty app program. • Deployed the application to testing and production environments in AWS Elastic Beanstalk. • Designed and developed new features, such as PinPayment API integration, scheduled rewards program, multi-factor authentication (MFA), payment via QR code, customer review and ratings, and eGift coupon creation. • Collaborated with front-end developers to integrate the API with the mobile app. • Tested all the API's and functionality using TDD principles like RSpec and Factorygirl. • Conducted code review, bug fixes, approved technical solutions, and mentored junior developers. • Troubleshot and resolved production issues via SSH. • Wrote technical and deployment documentations to facilitate knowledge sharing and maintainability. • Tools: Ruby on Rails, PostgreSQL, RSpec, ActiveAdmin, Git, GitHub, Redis, AWS (Elastic Beanstalk, EC2, S3, CloudWatch, SNS), Sentry, JavaScript, HTML, CSS & Asana Show less

Full Stack Web Developer

• Nov 2017 - Jun 2021

Contributing to building EMS’s fuel management portal 'Fuelsuite' by developing and maintaining real-time platform processing tens of thousands of messages per minute from IoT devices worldwide (Australia, China & New Zealand). • Working as part of a team of two developers to write clean and efficient code for Fuelsuite. • Participating in code reviews, fixing bugs, and adding additional features to the platform. • Developing new functionalities for Rails back-end API and writing test cases using RSpec & factorygirl • Creating and maintaining real-time analytical dashboard using Vus.js, High charts, and Material CSS. • Writing unit tests for UI components and models for code coverage using Karma • Using Kibana for testing and writing complex Elastic Search queries to integrate with Rails API via templates. • Deploying to production servers using Circle CI as part of CI/CD process. • Tools: Ruby on Rails, Docker, PostgreSQL, RSpec, Git, Elastic Search, AWS cloud (S3, CloudFormation, CloudWatch & SQS), Scout APM, Node.js, Vue.JS, JavaScript, HTML, CSS, Arch Linux & Circle CI Show less

.NET Developer

• Apr 2015 - Nov 2017

Participated in the development phase of the sophisticated CRM solutions for mortgage brokers. Implemented and developed modules for Symmetry CRM, which is a premier loan management tool designed for mortgage professionals. It provides Lead Management, Point of Sale tool, Loan Processing workflow, Business reporting, cloning of loans, pre-populating documents, sending of email & SMS to customer. • Developed enhancements to ANZ Toolkit and enterprise mortgage broker’s toolkit and maintained legacy web service application. • Responsible for converting mortgage broker’s loan calculation requirements into Web services and enhancing them. • Wrote SQL scripts to extract and import loan products data into production database. • Created and maintained unit tests for code coverage and reviewed code written by team members. • Contributed to daily stand-ups meeting and sprint planning as part of agile methodologies. • Managed projects with agile methodologies in JIRA. • Conducted Production & UAT deployments and liaised with product admin team to analyse bugs and resolve issues. • Tools: Git, TFS, VS 2015/2013, Angular JS, C#, ASP.NET, MVC 5, Razor, Web Services (Web API, WCF, JSON), SOAP UI, Bootstrap, LINQ, Entity Framework 6, SQL Server 2012 Show less

Senior IT Consultant

• Jul 2012 - Mar 2015

Developed and architected a real-time sports betting web and desktop application for the NBL, MBL, and horse racing industries. • Designed and developed a scheduler engine to read live sports feeds from SFTP accounts and processed and stored them in production databases. • Converted legacy sports betting systems into .NET-based systems and enhanced features. • Developed a data processing engine to route, translate, process submitted data, easily track data batches, and convert data from a wide variety of file formats into standard XML format. • Created dynamic, flexible customized reporting modules for data analysis and generated reports using Business Intelligence (BI) and Reporting Services (SSRS). • Automated manual processes, reducing processing time and increasing client's business sales by 30%. • Worked with various clients in the healthcare, sports, real estate, and retail industries. • Tools: Visual Studio (2013/2012/2010), ASP.NET, C#, MVC5, Angular JS, HTML5, Web Services, Windows Services, XML, WPF, SQL Server 2012 Show less

Software Engineer

• Jan 2010 - Jan 2012

Third Sight develops web-based Email Knowledge Archival & Management system for Singapore government departments (Ministry of Finance, Ministry of Law & Police Force). Participated in the all the development and release phase of the Email Knowledge Archival & Management system. Improved the search module and integrated Pivot Viewer graphical reports using Silverlight based. Developed automated deployment tool to deploy the database assembly & scripts to production databases and reduced the deployment time & improved the deployment process. Developed new module to upload documents & attachments by integrating ECM Documentum & intranet accounts, and generated reports using Business Intelligence (BI) & Reporting Services. Created POC (Proof of Concepts) to test new ideas and integrate Alfresco with C# application. Show less

Freelance Programmer

• Aug 2009 - Dec 2009

• Completed SAP MM & ABAP modules certifications • Completed SAP MM & ABAP modules certifications

Software Engineer

• Sep 2006 - Jul 2009

Re-architected and ported the remote monitoring tool for Telecommunications Systems to proactively check the entire system’s overall efficiency around the clock, monitor error codes and send out SMS alerts to pre-selected mobile users, reducing network equipment downtime. • Developed various web and desktop-based in-house applications to reduce manual processes and improve work efficiency for pay slip generation, online leave application, and hardware and software auditing. • Designed, developed, and maintained applications to support network equipment such as PABX, Voice Logger, Voice Messaging, and CTI System for Singapore's leading banks and telecoms. • Utilized tools such as Visual Studio 2008/2005, ASP.NET, Web Forms, WinForms, Ajax, C#, VB.NET, Enterprise Library, MS SQL Server 2005/2000, MySQL, SNMP, Telnet, MSMQ, Reporting Services (SSRS), Business Intelligence (BI), and DTS. Show less

Senior System Engineer

• Jun 2006 - Aug 2006

Developed a web-based milk powder manufacturing monitoring application integrated with SharePoint Server & Industrial Application Server 1.1 and served as primary technical lead throughout the product’s development process and mentoring team members for Nestle, Surabaya, Indonesia Developed a web-based milk powder manufacturing monitoring application integrated with SharePoint Server & Industrial Application Server 1.1 and served as primary technical lead throughout the product’s development process and mentoring team members for Nestle, Surabaya, Indonesia

Freelance Programmer

• Jan 2006 - May 2006

Team Lead

• Jul 2005 - Dec 2005

Software Engineer

• Jun 2004 - Jul 2005

Software Engineer

• Jan 2003 - May 2004

Trainee Software Engineer

• Oct 2000 - Oct 2001