Ivan – Typescript, AWS, AI-assisted coding

A retail web platform for a bookstore client expanding into online sales — featuring product browsing, cart management, and order processing.

• Developed a full-stack e-commerce web application as part of a client engagement, implementing the Java/Spring Boot backend and React frontend.
• Set up CI/CD pipelines via GitHub Actions for automated build and deployment workflows.

A gaming startup's full-stack product suite: an internal operations portal for team management and communications, a high-performance multiplayer game server, and a mobile game (Hexaplus / TravelSort) built with TypeScript and Cocos Creator — published on the Play Store.

• Architected and developed an internal company portal from scratch, designing both React/TypeScript frontend and Golang backend to cover operations, team communication, and event tracking.
• Provisioned and managed AWS infrastructure end-to-end: S3, EC2, CloudFront, DynamoDB, RDS, API Gateway, and CloudWatch.
• Optimized game server concurrency and added new features, improving multiplayer throughput and session reliability.
• Built and maintained CI/CD pipelines via GitHub Actions for automated deployments across environments.
• Developed the Hexaplus/TravelSort mobile game client in TypeScript with Cocos Creator; published to Play Store and App Store.
• Implemented a low-latency team chat system backed by DynamoDB and a MySQL-based event tracking system.

An e-commerce platform for one of Singapore's largest supermarket and retail chains — managing online orders, logistics operations, and warehouse integrations at scale. The platform integrates with third-party logistics providers, SAP, and a network of internal microservices handling daily high-volume order flows.

Transport Management System (TMS — VersaFleet Replacement):

• Designed system architecture using XML diagrams, ERDs, state/status mappings, and flowcharts to meet logistics and routing requirements.
• Built RESTful APIs in Golang with PostgreSQL provisioned via Terraform for persistence and horizontal scalability.
• Deployed services on GCP Cloud Run for high availability and auto-scaling; conducted load testing with Python scripts.
• Updated React frontend to integrate with new backend APIs.

Email Automation System:

• Architected an automated stakeholder notification system using XML diagrams and ERDs.
• Built a Golang service that generates HTML/CSS email reports via Excel libraries and delivers them to operations stakeholders.
• Automated SAP order posting using GCP Cloud Scheduler + Golang, reducing manual workload by 80%.

Product Location Microservice:

• Led the design and delivery of a new microservice for product location storage within the order management ecosystem.
• Developed a Golang SDK exposing a clean interface for other microservices to consume the service without coupling to internal implementation.
• Mentored new backend engineers on Golang architecture and coding standards.

Overall:

• Owned end-to-end order management infrastructure across multiple sub-systems: architecture, API design, deployment, and ongoing reliability.
• Led team operations as Acting Team Lead: Agile sprint planning (2-week cycles), stakeholder communication, and production incident response.

A digital platform connecting domestic helpers with employers in Singapore — featuring profile management, matching flows, and employer inquiry handling. Includes a corporate web presence and Golang-based backend tooling for data operations.

• Built the corporate website in React and deployed it on Firebase with GCP hosting.
• Developed Golang automation scripts for database migrations, ensuring 100% data integrity throughout the data transition.

A large-scale e-commerce marketplace serving tens of millions of users across Southeast Asia. The QA scope covered automated testing infrastructure, Kafka/HBase data pipeline validation, and backend API testing across core product, payment, and logistics flows.

• Designed and implemented an automation testing framework using the Builder pattern, including mock services for API-level validation.
• Built Golang scripts to validate Kafka/HBase data pipelines, ensuring data integrity and latency compliance across pipeline stages.
• Performed manual backend API testing across product and logistics flows, verifying alignment with business requirements.
• Led a team of 3 QA engineers to implement integration and smoke testing systems.