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Diaz Harizky Firdaus

@diazharizky

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I build high-performance backend services, microservices, and payment systems with Go, Python, and AWS.

Indonesia

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What I'm looking for

I'm looking to build and improve high-performance backend systems, APIs, microservices, and payment features while contributing to reliable architecture and mentoring engineers.

I've built and improved backend products at Partipost, EngageRocket, Telkom Indonesia, and Melon, focusing on APIs, microservices, payments, and platform reliability.

At Partipost, I reduced batch image upload processing from 14 seconds to 3 seconds and increased core API performance by 70% while cutting latency by more than 50%.

I've led payment-provider migrations, banking integrations worth over $120,000, and core features including an e-Wallet, promo codes, comments, and AI-powered caption review. I also identified race conditions and implemented Redis distributed locking.

Previously, I helped establish EngageRocket's Go microservice architecture and testing practices, migrated services from Rails to Go, and mentored junior engineers and interns at Telkom Indonesia.

Experience

Work history, roles, and key accomplishments

Current

Senior Backend Engineer

Current

Partipost Pte. Ltd.

Oct 2023 - Present (2 years 11 months)

Responsible for feature developments, performance improvements, bug fixing, and technical support. Reduced batch image uploads processing time from 14s to 3s, increased core APIs speed by 70%, and led migration of payment options and banking service integration.

Python Django PostgreSQL Redis AWS EC2 AWS ECS RDS Elasticache Amazon Cloudfront CloudTrail ECR Lambda Distributed Locking API Design Performance Optimization

Senior Backend Engineer

EngageRocket Pte. Ltd.

Jan 2022 - Jun 2023 (1 year 5 months)

One of the founding Go backend engineers, led initialization of Go microservice codebase, defined architecture, implemented dependency injection, and established unit testing practices. Partially migrated existing backend microservices from Rails to Go and led HRIS integration development.

Go Gin Ruby Ruby on Rails JavaScript TypeScript React PostgreSQL Redis AWS EC2 AWS ECS RDS Elasticache Lambda Aurora Microservices Dependency Injection Unit Testing

Fullstack Developer

Telkom Indonesia

Jan 2016 - Dec 2022 (6 years 11 months)

Primarily worked as API developer and maintainer on API marketplace project. Developed and maintained billing backend service, microservices for API middleware, and contributed to PeduliLindungi, the Indonesian government app for COVID-19 spread monitoring.

JavaScript TypeScript Express React Go Gin MariaDB Elasticsearch Minio API Development Microservices Mentorship

Fullstack Developer

Melon

Sep 2020 - May 2021 (8 months)

Developed backend microservices using JavaScript (Express) and Go (Gin), a websocket service for multiplayer games, billing backend service, and a web application for game publishers/developers.

JavaScript Express React Go Gin Gorilla MariaDB Minio Elasticsearch WebSockets Game Development

Fullstack Developer

Madtive Studio

Nov 2019 - Mar 2020 (4 months)

Developed a mobile app using JavaScript (Framework7), a backend service using Go (Gin) and MariaDB, and a web application using PHP (CodeIgniter with HMVC) and MariaDB.