dehamzah

Selected Work

A selection of work where I focused on building systems that scale across teams, improve operational clarity, and create long-term leverage.

Grab Internal Developer Portal

Senior Software Engineer Fullstack • TypeScript, Node.js, React, PostgreSQL, Kubernetes, Go, Python, AWS

Built a centralized internal developer portal that became the single source of truth for 70,000+ entities (services, databases, pipelines, ML, infrastructure, and more), used by 2,000+ engineers across 18+ integrations.

Key Contributions

  • Designed and owned the entity catalog aggregating metadata from multiple legacy systems
  • Drove data quality improvements through metrics and prioritization
  • Led a company-wide cloud tagging initiative linking infrastructure resources to service ownership
  • Improved CI/CD reliability and platform stability to support zero-downtime migrations
  • Partnered closely with product managers and platform teams to drive adoption

Impact

  • Established a trusted single source of truth for engineering systems
  • Improved onboarding, service discoverability, and ownership clarity
  • Enabled service-level cost attribution, reducing yearly budgeting cycles from weeks to days

Wahyoo

Lead Software Engineer • TypeScript, Node.js, ExpressJS, React, Flutter, MySQL, Serverless, Kafka, GCP

Led the modernization of mobile and backend systems supporting thousands of small food stall owners (Warteg) across Indonesia, improving development speed, reliability, and cost efficiency.

Key Contributions

  • Rebuilt the merchant mobile app in Flutter, setting up end-to-end CI/CD and simplifying release workflows
  • Modernized backend systems by introducing Node.js, containerization, and serverless deployment
  • Eliminated manual deployments by implementing automated testing, build, and rollout pipelines
  • Mentored engineers, maintained code quality, and led technical planning during sprints

Impact

  • Significantly improved mobile development velocity and stability
  • Reduced mobile app artifact size by ~50%
  • Cut backend infrastructure costs by up to 80%
  • Enabled faster, safer releases and reduced operational risk in a high-growth environment

Alamat.com

Senior Software Engineer (Early Engineer) • TypeScript, React, ExpressJS, PWA, TWA, Algolia, CI/CD, MongoDB, GCP

Joined as the first senior software engineer to build a local lifestyle discovery platform from scratch, aiming to bridge offline businesses with digital discovery through a fast, accessible web experience.

Key Contributions

  • Built the main web application from scratch using React Progressive Web App (PWA)
  • Designed and structured the frontend codebase to support collaborative development
  • Set up and standardized CI/CD pipelines to improve velocity and reliability
  • Integrated Algolia for search and experimented with Trusted Web Activity (TWA) for Play Store publication

Impact

  • Successfully shipped a PWA-based mobile experience to the Google Play Store
  • Presented the PWA and TWA implementation at Google I/O Extended Jakarta 2019
  • The company was acquired by Wahyoo, where the team continued scaling systems