Yayak Zabara
Open to work
PORTFOLIOBACKEND · APIS · DATA · DISTRIBUTED SYSTEMS

I build the partsof the productyou never see.

AVAILABLE FOR HIRE

Backend engineer, five years in. I design the databases, APIs and pipelines that keep healthcare, e-commerce and HR platforms running — the unglamorous work that makes a product feel effortless.

ROLEBackend Engineer
EXPERIENCE5+ years
CURRENTLYRolling Glory — Technical Lead
BASEIndonesia
STATUSOpen to work
01

Selected Work

THREE SYSTEMS IN PRODUCTION
01HEALTHCARE

Community Health Platform

BACKEND ENGINEER · TECHNICAL LEAD

A platform for community-based health screening and home-visit management — patient data collection, health worker scheduling, clinical reporting. Built on the FHIR standard so records interoperate with the national health system, with an ETL pipeline that transforms and syncs every record.

“ClickHouse does the OLAP heavy lifting behind the reporting dashboards; Redis and PostgreSQL keep it fast and honest.”

STACK

NestJS
PostgreSQL
Redis
ClickHouse
FHIR
ETL Pipeline
02HUMAN RESOURCES

HRIS Platform

TECHNICAL LEAD

Payroll and HR built for real Indonesian employment rules — automatic PPh21, BPJS TK and BPJS Kes calculations, attendance, leave and overtime, business trips, allowances and payslips, with an operational dashboard on top.

“One system for employee administration across multiple business units — no spreadsheets.”

STACK

PHP
Laravel
PostgreSQL
Redis
03E-COMMERCE

E-Commerce Backend

BACKEND ENGINEER · TECHNICAL LEAD

The engine behind a full retail ecosystem: product catalog, order lifecycle, payment gateways, inventory sync, promotions and vouchers, multi-channel notifications. It talks to 3PL logistics for live shipping rates and tracking, Insider for recommendations, Salesforce for support — with strict layering across public API, backoffice, background jobs and webhooks.

“10k+ concurrent users through peak sales, zero downtime.”

STACK

NestJS
TypeScript
PostgreSQL
MongoDB
Redis
BullMQ
OpenSearch
AWS S3
Xendit
Midtrans
02

Experience

FIVE ROLES · THREE COMPANIES

Rolling Glory

Technical Lead
JUL 2025 — PRESENT
  • Analyze feature requirements and design the ERD / database structures behind scalable backends.
  • Run technical briefings, task alignment and code reviews to keep delivery quality consistent.
  • Monitor API performance in DataDog and fix slow endpoints with load testing and query tuning.

Rolling Glory

Backend Engineer
FEB 2023 — PRESENT
  • Build and maintain backend services in NestJS, TypeScript, PostgreSQL and Redis.
  • Implement REST APIs, business logic, database models and third-party integrations.
  • Ship reliable features together with frontend, QA and product teams.

Sekawan Media

Engineer Lead
OCT 2022 — FEB 2023
  • Led requirement-gathering sessions with clients to clarify business needs and technical scope.
  • Supported pre-sales and project pitching with technical analysis and solution planning.
  • Managed task breakdown, team coordination and delivery priorities.

Sekawan Media

Web Developer
AUG 2020 — FEB 2023
  • Built full-stack web applications with CodeIgniter 3, jQuery, Bootstrap, MySQL and PostgreSQL.
  • Developed operational systems covering POS, accounting, agriculture reporting and task management.
  • Revamped legacy business applications for sugarcane intake and milling process tracking.

SMKN 1 Boyolangu

Web Developer
APR 2020 — AUG 2020
  • Built internal school systems with CodeIgniter 3, jQuery, Bootstrap and MySQL.
  • Developed apps for student administration, HR, curriculum, job placement and POS workflows.
  • Owned delivery end to end, from database design to deployment and maintenance.
03

Capabilities

TOOLS I REACH FOR
LANGUAGES & FRAMEWORKS

PHP · CodeIgniter · Node.js · NestJS · JavaScript · TypeScript · Express.js

DATABASES

PostgreSQL · MySQL · MongoDB · Redis · ClickHouse · OpenSearch

ARCHITECTURE & SYSTEMS

REST API design · Event-driven architecture · Message queues (RabbitMQ, BullMQ) · Caching strategies · ETL / data pipeline design · FHIR standards

DEVOPS & TOOLS

Docker · Git · CI/CD · Linux · Nginx · DataDog · AWS · Sentry

SECURITY

JWT · OAuth2 · API rate limiting · Input validation · Encryption at rest & in transit

04

Certification

CREDLY VERIFIED
AWS Certified Cloud PractitionerAmazon Web Services
2025View credential
05 — CONTACTNO FORMS. JUST EMAIL.

Let’s build somethingthat outlives the launch.

I’m open to full-time roles, freelance projects and technical collaborations. If you have a system that needs to survive contact with reality, we should talk.

EMAILmail@yayakzabara.my.id

What does Yayak Zabara do?

Backend engineer with 5+ years of experience. He designs databases, REST APIs and data pipelines for healthcare, e-commerce and HR platforms, currently working as a Technical Lead at Rolling Glory.

What is Yayak Zabara's tech stack?

NestJS, TypeScript, Node.js, PHP/Laravel, PostgreSQL, MySQL, MongoDB, Redis, ClickHouse, OpenSearch, BullMQ, RabbitMQ, AWS, and Docker — with deep experience in REST API design, event-driven architecture, ETL pipelines, and FHIR healthcare data standards.

Is Yayak Zabara open to work?

Yes. He is open to full-time roles, freelance projects and technical collaborations, reachable at mail@yayakzabara.my.id.

What notable systems has Yayak Zabara built?

A FHIR-based community health platform with ClickHouse OLAP reporting, an HRIS with automatic Indonesian payroll (PPh21, BPJS TK, BPJS Kes), and an e-commerce backend that served 10k+ concurrent users with zero downtime during peak sales.

GITHUBgithub.com/joleboLINKEDINin/yayak-zabaraINSTAGRAM@yayakzbr