Backend Developer
Sigma Group
Jul 2021 - Sep 2023 (2 years 3 months)
Backend Engineer across multiple web and mobile products, building microservices and event-driven workflows. - Built backend microservices using Node.js, Go, and NestJS for SMS processing, push notifications, and real-time chat across multiple web and mobile products. - Built a high-throughput push notification service in Go, optimizing database operations to improve delivery speed and reliability. - Implemented user authentication and event-management workflows using Amazon Cognito and AWS Lambda within NestJS core services. - Took ownership of a Go-based real-time chat service — fixing bugs, improving performance, and adding new features. - Contributed to frontend development with React.js (Redux) on the SMS panel for ~3 months.