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Santo Sidauruk

@santosidauruk

I build scalable web and backend systems with TypeScript, Go, Kubernetes, and product ownership.

I've built and modernized payment and web platforms at LinkAja and Kitabisa.com, from leading an EC2-to-EKS microservices migration that saved IDR 270M per month to delivering E-Statement Dormant, which generated IDR 9.8B in its first cycle.

I work end to end across Next.js, TypeScript, Go, Kafka, Kubernetes, and PostgreSQL. Recently, I've built a stock portfolio MVP and am developing a Go KYC backend with Redis, Asynq, Docker, OCR, and identity-upload workflows.

Experience

Work history, roles, and key accomplishments

Current

Independent Software Projects

Current

Self Employed

Jan 2026 - Present (8 months)

Built and deployed a stock portfolio MVP using Next.js and TypeScript, integrating the Yahoo Finance API for real-time pricing. Developing a Go KYC backend with PostgreSQL, Redis, Asynq, and Docker.

Next.js TypeScript Yahoo Finance API Go PostgreSQL Redis Asynq Docker

Squad Lead

LinkAja

May 2024 - Nov 2025 (1 year 6 months)

Drove migration of microservices from EC2 to EKS, achieving IDR 270M/month cost savings. Delivered E-Statement Dormant initiative and led QRIS Switching expansion, generating significant revenue.

Go Kubernetes Amazon EKS Kafka Redis Microservices Cost Optimization Leadership

Senior Software Engineer

LinkAja

Sep 2021 - May 2024 (2 years 8 months)

Architected a React component library using Emotion and Storybook, and led development of the LinkAja Paylater web application. Extracted the Denomination module from Node.js into a Go service.

React Emotion Storybook TypeScript Next.js NodeJS Go Service Extraction

Frontend Manager

Kitabisa.com

Oct 2020 - Aug 2021 (10 months)

Designed and rolled out a performance evaluation framework for frontend engineers. Oversaw strategic planning and optimized engineering resource allocation, increasing team productivity.

Performance Evaluation Strategic Planning Resource Allocation Mentorship Team Leadership

Frontend Engineer

Kitabisa.com

Oct 2016 - Oct 2020 (4 years)

Transformed frontend architecture from MVC-based jQuery to Next.js, reducing page load times by ~50% and improving team velocity by 2x. Modernized build system from Gulp to Webpack, reducing build times by ~30%.

Next.js React TypeScript Webpack Gulp jQuery Performance Optimization