Available for hire
Yayak Zabara
Backend Developer
Backend engineer focused on scalable systems, clean architecture, and performance-driven APIs. Specializing in PHP, Node.js, and NestJS.
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
Career Timeline
Technical Lead
·Rolling GloryFeb 2026 – 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 GloryFeb 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 MediaOct 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 MediaAug 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 BoyolanguApr 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
Projects
Community Health Management Platform
Backend platform for community-based health screening and home visit management. Handles patient data collection, health worker scheduling, and clinical reporting — built on FHIR (Fast Healthcare Interoperability Resources) standard for interoperability. Designed to support posyandu operations and field health monitoring at scale.
Implemented FHIR-compliant data models enabling seamless integration with national health information systems, backed by Redis caching and PostgreSQL for reliable data persistence.
Role: Backend Engineer, Technical Lead
HRIS Platform
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.
Role: Technical Lead
E-Commerce Backend Platform
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. 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.
Role: Backend Engineer, Technical Lead
Skills & Certifications
Technical Skills
Languages & Frameworks
Databases
Architecture & Systems
DevOps & Tools
Security
Certifications
AWS Certified Cloud Practitioner
Amazon Web Services(AWS)
Get In Touch
Let's build something impactful together. I'm open to full-time roles, freelance projects, and technical collaborations.