Hamdani Prasasti Email & Phone Number

Jakarta, Jakarta, Indonesia

Becoming a Senior at DANA Indonesia, I was responsible for becoming a System Owner for DANA Deals and Pesan Instant services with the 2 subordinates' support.System Owner is responsible for Effort Estimation, System Quality, Team Performance, and Stakeholder Satisfaction.The key point for the System Owner1. Accountable Estimatation.The estimation should consider the Product Requirement, Good System Design, and Team workload. Balancing those three aspects is the Art of… Show more Becoming a Senior at DANA Indonesia, I was responsible for becoming a System Owner for DANA Deals and Pesan Instant services with the 2 subordinates' support.System Owner is responsible for Effort Estimation, System Quality, Team Performance, and Stakeholder Satisfaction.The key point for the System Owner1. Accountable Estimatation.The estimation should consider the Product Requirement, Good System Design, and Team workload. Balancing those three aspects is the Art of Tech Leadership.2. Leadership is not by Position but By Influence. - Lead by Example, if you expect your team to produce a clean code, your code has to be there first. If you expect ownership of your team, you have to stand first if any issue comes up. - Expose them to Growth, if your team has challenges, let them explore the solutions with guidance. - Reliable for Teammates, If your team feels stuck, listen and understand their work or personal problems. Take responsibility for any good or bad situations.3. Delivering System Quality. - Measurement of the RPS, Latency, and Success Rate. - Push the API latency to less than 100ms by leveraging Caching and RPC communication within service-to-service, to reduce HTTP network and encoding overhead. - Maximizing the RPS per instance to produce a cost-efficient application. - The developers must review the QA Test Plan and give the context about the Must-Have Scenarios for testing *only the Developer and God know the logic behind the API.4. Maintainable System - Defining the Design Pattern rule with the team. - Documenting your API/Changes Articulatively by API Specs, State Management, Diagram, ERD, etc. - If your engineer develops a new logic or revamps the old logic, please make sure they have the function switcher to switch off.5. Clear Goals and Objectives. - Talk to the Head/Managers/VP to define the Team Objectives. - Set goals and execution strategy. Explain boldly to the members. Show less

"Highly Regulated Finance Industry" is the keyword that I acknowledged when I joined the company for the first time.The release is combined between waterfall and agile models to deal with Agility and Compliance with the Risk Management Procedure. Most of the projects that I handled were related to 3 party integration, order management, product discovery, and gamification.Project example: - EMoney Mandiri. - BRI Brizzi. - A+ Rewards. - Merchant Promotion… Show more "Highly Regulated Finance Industry" is the keyword that I acknowledged when I joined the company for the first time.The release is combined between waterfall and agile models to deal with Agility and Compliance with the Risk Management Procedure. Most of the projects that I handled were related to 3 party integration, order management, product discovery, and gamification.Project example: - EMoney Mandiri. - BRI Brizzi. - A+ Rewards. - Merchant Promotion Platform.One of my proudest contributions is developing the DANA Auction Service to serve as the main product of the 2021 and 2022 DANA 11.11 events.Key point learning:1. Risk Management a. Pre-Deployment - System Design, Testing Plan, and Integration Analysis & Review. - Peer and Lead Code Review. b. Deployment - Implementation of Config as a Code. - Blue Green Deployment or Canary Release. - Function toggle or switcher. c. Post-Deployment - Feature alert and monitoring. - Risk Documentation. - Sharing the knowledge with the Ops and Technical Support team.2. Fault Tolerance System Design. - Retry-able process both with broker retry and/or Scheduler. - Auto-routing and reverse flow scenarios. - Idempotent data/request handling to deal with Data Race situations.3. Financial Business Process - Trx Reconciliation of Settlement and Kliring process. - Dispute management with 3 keywords "Tracing, Analyzing, and Proving".4. Scalable System Design - Database partition design to distribute the data and computing power. - Implementation of concurrent process and data caching with Local and/or Centralized cache to boost discovery performance. - Batch and distributed data processing to manage system stability.5. System Observability - Log standardization and centralization. - Proper Monitoring to capture System, API, and Business performance. - End-to-end traceable request by traceId. Show less

Greater Jakarta Area, Indonesia

My first-time Unicorn. This allows me to deep dive into both System and Product QualityMy role was responsible for managing Tokopedia Official Store Merchant Service.The most interesting part was, that we had to make sure the system was reliable, maintainable, scalable, fast, and accountable.Key Point Learning1. Reliability - Proper error handling. - Graceful shutdown. - Circuit breaker pattern. - Retryable process. - Canary… Show more My first-time Unicorn. This allows me to deep dive into both System and Product QualityMy role was responsible for managing Tokopedia Official Store Merchant Service.The most interesting part was, that we had to make sure the system was reliable, maintainable, scalable, fast, and accountable.Key Point Learning1. Reliability - Proper error handling. - Graceful shutdown. - Circuit breaker pattern. - Retryable process. - Canary deployment. - Function switcher/toggle. 2. Scalability - Instance Containerization. - Master/Slave or Database replication technique. - Regular load testing.3. Maintainable - Golang Clean Architecture. - Proper monitoring solutions with Prometheus, Grafana, and Datadog - System alerting with Pager Duty.4. Fast - Centralize caching with Redis and Localize caching with Memcache. - Concurrent process with Golang Chanel, and Go Routines with worker pull concept.5. Accountability - Process locking with centralized lock by leveraging Redis SETNX. - Data locking with Pessimistic or Optimistic Locking. - Data idempotent check with leveraging unique column. Show less

Greater Jakarta Area, Indonesia

My first-time start-up experience. This exposed me to the Dynamic and Agile environment.My role is responsible for developing a Bizzy contract management system that was required to manage price agreements between Buyer Users and Vendor Users for individual SKUs.The most challenging part was the system must be capable of uploading a thousand rows of Excel and storing them in the database. An approach that we delivered:1. Implementing the Pre-Sign URLs concept that… Show more My first-time start-up experience. This exposed me to the Dynamic and Agile environment.My role is responsible for developing a Bizzy contract management system that was required to manage price agreements between Buyer Users and Vendor Users for individual SKUs.The most challenging part was the system must be capable of uploading a thousand rows of Excel and storing them in the database. An approach that we delivered:1. Implementing the Pre-Sign URLs concept that made the Front-End upload the Excell File directly to the Cloud OSS, instead of sending String of base64 to the BackEnd.2. Implementing asynchronous batch data processing by chunking the rows into several batches, to avoid Connection Pool Timeout and Full Connection Pool Occupancy.3. Batch data synchronization to Price Engine Service, after the contract was agreed by both parties.Key Point Learning1. Hands-on with the cloud-native environment, which introduce me to - AWS Cloud services like API Gateway, SQS, SNS, and Lambda.- Microservice and Event-Driven Architecture.- Containerization and CICD Concept. 2. Exposure to the Agile SDLC process and Design Thinking mindset. Show less

Jakarta

My first professional job exposed me to real-world system scenarios.My role is delivering systems to support business processes such as :1. JCS Online: Approval Process for Vendors before they receive the "Good Receipt" of "Purchasing Orders".2. SOT FQR (Sistem Operasi Terpadu - Financial Quarterly Reports): The system that supports the Finance Department in reviewing Company Revenue Data before they are sent to SKK Migas XBRL system.3. SAKA Smart: Mobile Apps… Show more My first professional job exposed me to real-world system scenarios.My role is delivering systems to support business processes such as :1. JCS Online: Approval Process for Vendors before they receive the "Good Receipt" of "Purchasing Orders".2. SOT FQR (Sistem Operasi Terpadu - Financial Quarterly Reports): The system that supports the Finance Department in reviewing Company Revenue Data before they are sent to SKK Migas XBRL system.3. SAKA Smart: Mobile Apps and Open API Web Services for Company business systems such as- Internal Approval Form- HSE Observation Card- Company News- Bussines trips- etcWe also keep developing our essential platform, called "eForm," to make company processes effective and efficient.Key Point Learning1. Understanding the enterprise business process.2. Learning about the Oil and Gas business landscape.3. Managing stakeholders from Managers to Staff across the Department. Show less

Bachelor'S Degree, Information Technology, 3.62

Activities and Societies: Lab Assistant

Vocational High School, Computer And Network Engineering