Kamal Zaki Abdurrafi
I design scalable APIs and microservices that move millions of records across logistics, fintech, and public-sector platforms.
Selected work
Systems built for scale and trust, from national logistics to public-sector platforms. Live where possible, private where it has to be.
Nationwide Logistics Platform
Wings Group Indonesia · 2025
- Problem
- A nationwide distribution network processing millions of delivery records needed low-latency APIs and reliable sync with enterprise ERP systems.
- Solution
- Architected 6+ Node.js/NestJS microservices, integrated SAP ERP and Coupa for real-time batch sync, and built volume and counter-weight load-planning algorithms to improve fleet utilization.
- NestJS
- Node.js
- PostgreSQL
- Redis
- SAP ERP
- Loki
- Grafana
SABIT Community Products
SABIT Community · 2024
- Problem
- A growing tech community needed production products and a platform to train interns on real, shipped software.
- Solution
- Founded the studio and built production web apps with Next.js and Node.js: the community platform with CMS, a ride-hailing platform, and a point-of-sale system, serving 60+ members and three internship teams.
- Next.js
- Node.js
- TypeScript
- MongoDB
Where I've built
Five years across logistics, fintech, education, and tourism. Same discipline every time: fast APIs, clean data, watchful observability.
- Sep 2025 - Present
Back End Developer
Wings Group Indonesia · Logistics & FMCG Distribution
Microservices powering a nationwide logistics platform; cut API latency with indexing and caching strategies.
- Nov 2024 - Present
Founder & Full-Stack Developer
SABIT Community · Tech Education & Product Studio
Shipped production apps and mentored three internship teams across 60+ community members.
- Jun 2025 - Sep 2025
Senior Backend Engineer
EIGER Adventure Land · Retail & Adventure Tourism
Delivered ticketing, onboarding gates, and point-of-sale in a three-month opening sprint.
- Nov 2022 - Jun 2025
Back End Developer
PT Aktif Bangun Citra · Education & Career Technology
Built Next Steps Idaho on AWS and engineered ETL pipelines unifying multi-source datasets.
- Dec 2021 - Dec 2022
Back End Developer (Freelance)
Dapen Telkom Mobile · Pension & Identity Verification
Pension platform for 20,000+ users with AI face recognition and full bare-metal infrastructure.
The technology map
Grouped by the layer it lives in. Hover a cluster to bring it into focus.
Backend
8 technologies
Services, APIs, and business logic at scale.
- Node.js
- NestJS
- ExpressJS
- Python
- Flask
- FastAPI
- PHP
- Laravel
Frontend
4 technologies
Interfaces that meet the backend halfway.
- TypeScript
- JavaScript ES6+
- React.js
- Next.js
Infrastructure
11 technologies
Deploy, observe, and keep it running.
- AWS EC2
- AWS S3
- AWS Lambda
- Cognito
- Docker
- Nginx
- CI/CD
- Bare Metal
- Loki + Grafana
- Sentry
- Uptime Kuma
Data
6 technologies
Storage, caching, and integration surfaces.
- PostgreSQL
- MySQL
- MongoDB
- Redis
- SAP ERP
- Payment Gateways
I build the parts users never see, so the parts they do see never break.
Five years in, my work sits behind logistics fleets, pension records, and public-sector career platforms. The common thread is scale and trust: APIs that stay fast under load, data pipelines that reconcile messy sources, and observability that catches problems before users do.
I started SABIT Community to teach that craft in the open, shipping real products with interns instead of toy demos. Full-stack when it helps, but backend is where I do my best thinking.
Available for backend and full-stack roles