yayak_zabara.dev
identity1 record

portfolio=>

About Me

With over 5 years of experience in backend and full-stack development, I specialize in building reliable backend systems, maintainable APIs, and business applications. My current work focuses heavily on Node.js, NestJS, TypeScript, PostgreSQL, Redis, and backend architecture.

I work across feature analysis, ERD/database design, API implementation, integration work, debugging, query optimization, and performance monitoring. I also support team delivery through task alignment, code review, and technical guidance.

tech_stack

PHPLaravelNode.jsNestJSTypeScriptPostgreSQLMySQLMongoDBRedisRabbitMQDockerREST APIsJWT / OAuth2
experience5 records

portfolio=>

Career Timeline

Technical Lead

Rolling Glory

Jul 2025 – Present

  • –Analyzed feature requirements and designed ERD/database structures to support scalable backend implementation
  • –Led technical briefings, task alignment, and code reviews to ensure consistent delivery quality across the team
  • –Monitored API performance using DataDog and supported performance improvements through load testing and optimization
  • +Improved low-performing APIs through load testing, query tuning, and backend optimization
  • +Maintained high code quality standards through technical guidance, review, and delivery oversight

Backend Engineer

Rolling Glory

Feb 2023 – Present

  • –Built and maintained backend services using NestJS, TypeScript, PostgreSQL, Redis
  • –Implemented REST APIs, business logic, database models, and third-party integrations based on product requirements
  • –Collaborated with frontend, QA, and product teams to deliver reliable features through development, testing, and release
  • +Delivered high-quality backend implementations that were easy to maintain, test, and extend
  • +Improved production stability through debugging, query optimization, and service-level refactoring

Engineer Lead

Sekawan Media

Oct 2022 – Feb 2023

  • –Led requirement gathering sessions with clients to clarify business needs and technical scope
  • –Supported pre-sales and project pitching through technical analysis and solution planning
  • –Managed task breakdown, team coordination, and delivery priorities across development work
  • +Improved delivery clarity by translating client requirements into actionable development tasks
  • +Maintained code quality through technical reviews and team guidance

Web Developer

Sekawan Media

Aug 2020 – Feb 2023

  • –Built full-stack web applications using CodeIgniter 3, jQuery, Bootstrap, MySQL, and PostgreSQL
  • –Developed operational systems covering POS, accounting workflows, agriculture reporting, and task management
  • –Revamped legacy business applications for sugarcane intake and milling process tracking
  • +Optimized database queries to improve application performance and reporting speed
  • +Delivered production-ready web and Cordova-based applications for real-world operational use

Web Developer

SMKN 1 Boyolangu

Apr 2020 – Aug 2020

  • –Built full-stack internal school systems using CodeIgniter 3, jQuery, Bootstrap, and MySQL
  • –Developed web applications to support student administration, HR, curriculum, job placement, and POS workflows
  • –Owned end-to-end delivery from database design to deployment and maintenance
  • +Digitized multiple manual administrative workflows across school operations
  • +Delivered several production-ready internal applications independently
projects3 records

portfolio=>

Projects

Community Health Management Platform

Backend Engineer, Technical Lead

Backend platform for community-based health screening and home visit management. Handles patient data collection, health worker scheduling, and clinical reporting — built on the FHIR (Fast Healthcare Interoperability Resources) standard for interoperability with national health information systems. An ETL pipeline transforms and syncs records to the national system in FHIR format, while ClickHouse serves as the OLAP engine behind reporting dashboards and stores large-scale interoperability logs. Designed to support posyandu operations and field health monitoring at scale.

Built an ETL pipeline syncing FHIR-compliant records with national health information systems, with ClickHouse serving as the OLAP engine for reporting dashboards and large-scale interoperability logs — backed by Redis caching and PostgreSQL for reliable data persistence.

NestJS/Redis/PostgreSQL/ClickHouseDB/FHIR Standards/ETL

HRIS Platform

Technical Lead

An HRIS platform managing employee payroll with automatic PPh21, BPJS TK, and BPJS Kes calculations. Supports employee management (NIK, position, department), daily attendance, and submissions for leave/sick leave/overtime/business trip, allowances, and payslips. Equipped with operational dashboard.

Automated payroll processing, attendance tracking, leave management, and employee administration across multiple business units.

PHP/Laravel/Redis/PostgreSQL

E-Commerce Backend Platform

Backend Engineer, Technical Lead

High-scale e-commerce backend powering a full retail ecosystem — product catalog, order lifecycle, payment gateway integration, inventory sync, promotions, vouchers, and multi-channel notifications. Integrates with 3PL logistics providers for real-time shipping rate calculation and shipment tracking, syncs the product catalog to Insider for personalized recommendations and behavioral marketing triggers, and connects live chat and complaint tickets to Salesforce for customer support. Built with strict layered architecture across public API, CMS backoffice, background jobs, and webhook handlers.

Architected a modular NestJS monolith serving 10k+ concurrent users with zero downtime during peak sales — backed by Redis caching, OpenSearch, queue-based job processing, and multi-gateway payment handling.

NestJS/TypeScript/PostgreSQL/MongoDB/Redis/BullMQ/OpenSearch/Sequelize/AWS S3/Xendit/Midtrans/3PL Integration/Insider/Salesforce
skills5 groups

portfolio=>

Skills & Certifications

Languages & Frameworks

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

Databases

PostgreSQL · MySQL · MongoDB · Redis · ClickHouseDB · 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

certifications

AWS Certified Cloud Practitioner

Amazon Web Services(AWS)

2025
view_credential →
contactnew_connection

portfolio=>

Get In Touch

Let's build something impactful together. I'm open to full-time roles, freelance projects, and technical collaborations.

hostmail@yayakzabara.my.id
ref/githubgithub.com/jolebo
ref/linkedinlinkedin.com/in/yayak-zabara
ref/instagram@yayakzbr
Send an Email
connected · guest@yayakzabara.my.idsession 00:00