Software Engineer

I manage and enhance core payment capabilities, including points, balances, withdrawals, vouchers, cashback, discounts, loyalty, referral, subscription, and pickup booster features. I build scalable APIs and integrations with third-party payment providers to support secure and reliable transaction processing.

I develop back-office dashboard capabilities for campaigns, notifications, balance adjustments, voucher administration, withdrawal monitoring, and customer reporting. I also improve code quality and system stability through bug fixes and refactoring, implement real-time payment updates using WebSockets, and work with Jenkins CI/CD, Golang, PostgreSQL, Redis, Google Pub/Sub, AWS SQS, Elasticsearch, and GCP.

I designed and implemented scalable RESTful API architecture through production deployment, using resource-based routing, stateless communication, and API versioning. I integrated third-party feed supplier and vaccination services through secure webhooks for inventory management and automated transactions.

I built notification services with Firebase Cloud Messaging and email fallbacks, reporting endpoints, PDF and Excel exports, and chicken performance analytics. I secured APIs using JWT authentication and rate limiting, maintained Postman collections for testing and mocking, and standardized legacy backend code for production readiness.

I worked part-time and freelance on a visitor management system, developing a Vue.js back-office dashboard for monitoring, managing, and analyzing business data. I integrated frontend components with backend APIs to provide consistent and efficient data exchange.

I developed secure Golang REST APIs for mobile and dashboard applications, implemented third-party visitor-data integrations, and used Redis caching to improve performance. I also managed PostgreSQL schemas and queries, applied JWT-based authentication, and used Git for collaborative version control.

I developed new features for big-data applications and built functional, sustainable web applications using clean code practices. I collaborated with frontend developers, QA, and product teams to deliver backend features aligned with requirements.

I implemented unit testing, troubleshot and debugged applications, and optimized systems for speed and scalability. My work included Node.js, TypeScript, NestJS, Redis, MySQL, SQL, and load and performance testing with JMeter.

I worked part-time on a hospital web application, designing and implementing features that supported stable operation and a seamless user experience. I developed backend business logic and APIs for patient registration, medical records, and billing administration using PHP and CodeIgniter.

I designed schemas and complex SQL queries in Oracle Database while maintaining data integrity and security. I fixed application issues, performed maintenance, collaborated with operational and medical teams, wrote technical documentation, and conducted unit and integration testing.

I deployed, monitored, maintained, and fixed products while working across teams and projects based on business priorities. I created web-based solutions for warehousing companies and contributed to warehouse management system applications.

I implemented APIs, validated test routines across browser and device types, and resolved issues identified through customer feedback and testing. I collaborated with teams to prioritize needs and select practical technical solutions.

I updated existing applications to comply with security and functionality standards and designed, edited, built, and maintained websites. I fixed bugs, developed and tested application programming interfaces, and maintained databases.

I worked with teams to resolve conflicts, prioritize requirements, and determine suitable solutions. I also performed website updates, validated test routines, and addressed problems identified through user feedback and testing.

I designed, built, and maintained scalable backend services and APIs, including RESTful and GraphQL interfaces. I maintained and refactored existing systems to improve stability, functionality, and maintainability.

I implemented security practices including data protection, JWT, and OAuth-based authentication and authorization. I designed SQL and NoSQL database schemas, optimized performance through caching and query improvements, integrated third-party services and microservices, and collaborated on CI/CD, deployment, and monitoring.

I developed scalable and maintainable applications, created APIs, and integrated them with frontend systems. I worked with product and design teams to understand user needs, formulate use cases, and deliver pragmatic technical solutions.

I improved existing code through refactoring and better engineering patterns, ensured automated test coverage and quality checks, and deployed, monitored, maintained, and fixed production products. I also contributed to continuous improvements in team practices and processes.

I analyzed systems, gathered requirements, documented pain points, and produced short software requirements specifications. I designed solution flows using UML use cases, activity diagrams, ERDs, and Swagger API contracts.

I built CRUD APIs and React pages, maintained clean commits, and followed testing and documentation practices. I used ESLint, Git Flow, CI/CD deployments, Trello, Slack, Figma, Postman, and Notion to support team delivery and user acceptance testing.