Naing Aung Linn

2025/09 – Present · Full-Stack Developer

A used-vehicle trading and recycling platform — a Ruby on Rails back office serving multiple Next.js frontends — covering auctions, inventory, parts, container exports, and insurance workflows. My work spans the Rails admin, the Next.js apps, and the platform's admin documentation.

• Developed the admin insurance-case module as one of its two main developers — vehicle assessment and disposal requests tracked from request through assessment, pickup, and settlement — creating its initial data model, admin screens, and notification mailers
• Implemented WebAuthn biometric login and registration alongside password-reset flows for insurance users, spanning the Rails backend and two of the Next.js frontends
• Built monthly inventory-management features — CSV and Excel report builders delivered through an asynchronous download center, overseas inventory snapshots, shared-stock exclusion, and parts-division release holds
• Created the vehicle inventory photo management module and extended demolition-report, parts-info, and container-invoice screens with new filters, columns, and outputs
• Wrote a large set of the platform's admin user manuals — inventory, invoicing, transport, and parts workflows — served through authenticated routes
• Backed feature work with RSpec request and model specs

Tech: Ruby on Rails 6 · Ruby · PostgreSQL · Slim · RSpec · WebAuthn · AWS S3 · Docker · Next.js 14 · React · TypeScript

2025/06 – 2025/08 · Full-Stack Developer

An accounting and budget-management system for a chemical-industry business, centered on multi-step approval workflows. My work focused on the workflow module — its screens, approval logic, and data tooling — along with permission handling and test design.

• Developed core workflow features — workflow detail screens with edit and delete, approval and redirect logic, email notifications, file downloads, and search by user layer
• Implemented copy-and-paste features for labor-cost details and workflow files, including the copy form design and popup flow, and reduced loading times
• Built Excel-to-JSON data extraction and fixed permission and security issues, including role- and permission-based redirects across all pages
• Hardened the module through validation and bug fixing — required-field validation, duplicate name and email handling, and approver error handling — and designed Excel-based test cases for the workflow list and search

Tech: MySQL · Excel

2025/04 – 2025/06 · Full-Stack Developer

A multi-tenant HR management system — a Laravel REST API backend serving a React admin frontend, covering employee, attendance, leave, allowance, and payroll workflows. I worked on both sides, from dashboard data aggregation and salary-calculation logic to the React screens that consume the API.

• Developed pending-request dashboard cards end to end — repository queries aggregating pending allowance and exchange-date requests in Laravel, and the React card UI wired to them, including tenant-specific dashboard variants
• Fixed salary-calculation logic so allowances are included in salary reports and payslips, and salaries are not calculated for employees with no assigned shift
• Improved the performance of employee leave and late/early Excel exports by reworking the spreadsheet-generation loop and its per-row styling
• Reworked the employee allowance registration UI — moved the effective-date form into the registration form and fixed effective-date handling for one-time allowances
• Extended the plan-register screen to add multiple employees at once through an employee-list modal

Tech: Laravel 7 · PHP · MySQL · React · CoreUI · Material-UI · axios · Laravel Excel · PhpSpreadsheet

2024/11 – 2025/03 · Backend Developer

A product management system whose main focus is processing product data through batch processing and scheduled jobs. My work centered on the data pipeline — developing the batch processes, optimizing the MySQL queries behind them, and validating and testing their output.

• Developed batch processes for handling product data on Laravel 11, including scheduled batches that automate recurring data-processing tasks
• Wrote and optimized MySQL queries to retrieve product data efficiently
• Processed and validated the data produced by the batch runs
• Created Excel-based test cases from the processed data and performed testing against them

Tech: Laravel 11 · PHP · MySQL · Redis · MinIO · MySQL Workbench · Excel

2024/03 – 2024/10 · Full-Stack Developer

A management system for an education center — a Laravel back office (Jetstream + Livewire) for running the center, alongside a Next.js public site for courses and enrollment. I was a founding backend developer on the system.

• Set up the Laravel project and implemented authentication, role- and permission-based access control (Spatie Permissions), and user administration
• Built the identity-card generation module — bilingual Myanmar–Japanese student ID cards rendered to PDF — along with graduation-certificate generation
• Implemented Myanmar-specific reference data — NRC list handling, Myanmar-calendar age conversion, and master-data modules later migrated from controllers to Livewire
• Implemented Word and PDF document export features
• Automated deployment with a GitHub Actions CI/CD pipeline targeting the production Ubuntu server
• Integrated and refactored the team's feature work on the Next.js frontend (navigation, course, and enrollment flows)

Tech: Laravel · Livewire · Jetstream · PHP · MySQL · Spatie Permissions · GitHub Actions · Ubuntu · Next.js 13 · React · TypeScript · Tailwind CSS

2023/11 – 2024/02 · Full-Stack Developer

A Japanese racehorse-support platform built by a small team — fans subscribe to support (“push”) their favorite racehorses and earn points, while an owners-club side offers fractional horse ownership with race and expense reporting. My work centered on payments and the public-facing frontend.

• Developed the fan service's Stripe payment layer on Laravel Cashier as its primary author — card registration, SetupIntents and PaymentIntents, monthly support subscriptions, webhook handling, and referral point rewards
• Built the subscription UI with Stripe Elements — the horse-push modal, card management, and payment-confirmation flows
• Built much of the owners-club side's web frontend as its second-largest contributor — home, about, owner, and fan pages; horse listing and detail; fractional horse-share pages; race results and reports; SSR and SEO for guest pages
• Implemented horse-report and horse-share API endpoints and resources in its Laravel backend

Tech: Laravel 10 · PHP · Laravel Cashier (Stripe) · Filament · PostgreSQL · AWS S3 · Docker · Next.js 13 · React · TypeScript · Tailwind CSS · Vercel

2023/04 – 2023/10 · Full-Stack Developer

A second development phase of the Car Rental Service, continuing work on the platform built from scratch in 2021–2022.

• Extended the contract workflow with repayment-debt tracking and rent-to-own contract improvements
• Maintained and improved modules across the admin system

Tech: Laravel 8 · PHP · MySQL · Blade · JavaScript

2023/01 – 2023/04 · WordPress Developer

Developed a WordPress website following the same approach as my earlier WordPress work — a custom theme built from scratch with the plugin functionality the site required.

Tech: PHP · WordPress · HTML · CSS · JavaScript

2021/05 – 2022/12 · Full-Stack Developer

A vehicle rental and rent-to-own management system covering the full contract lifecycle — users take out contracts on different vehicle types, with deposits, down payments, and monthly repayment schedules. I started the project from scratch as one of its two main developers and was its largest contributor.

• Set up the initial codebase and built the authentication system (registration, login, and password reset)
• Developed the contract-quotation and contract-management workflow as its primary author — quotations, credit screening, guarantors, repayment schedules, and rent-to-own signing
• Implemented Excel-based vehicle-data import and contributed across the vehicle, inspection, inventory, stock-taking, invoicing, delivery, and insurance modules
• Maintained the application's central routing and admin panel layout

Tech: Laravel 8 · PHP · MySQL · Blade · JavaScript · dompdf · Laravel Excel · Azure Blob Storage · Zoho CRM

2020/06 – 2021/04 · Support Team Member

A second period of support-team work on an e-commerce site-administration platform, covering the same scope as the earlier role.

• Set up online stores and built landing pages with HTML, CSS, and JavaScript
• Implemented Japanese address and postal-code data fetching using jQuery and AJAX
• Developed and optimized e-commerce pages with Symfony (PHP) and Twig templates

Tech: PHP · Symfony · Twig · jQuery · AJAX · HTML · CSS · JavaScript

2020/03 – 2020/05 · WordPress Developer

A WordPress website delivered end to end — from the first wireframes and frontend design system through to the finished theme.

• Designed the website wireframes and frontend design system from scratch
• Built and customized a fully custom WordPress theme
• Implemented required plugin functionality
• Set up Facebook Instant Articles integration

Tech: PHP · WordPress · HTML · CSS · JavaScript

2018/10 – 2020/02 · Support Team Member

Support-team work on an e-commerce site-administration platform — a service where merchants run their own online stores, similar in concept to Amazon or Shopify.

• Set up and configured new online stores on the platform
• Built and configured landing pages with HTML, CSS, and JavaScript
• Implemented Japanese address and postal-code data fetching using jQuery and AJAX
• Developed e-commerce pages with Symfony (PHP) and Twig templates
• Handled page-specific data fetching and optimized e-commerce pages

Tech: PHP · Symfony · Twig · jQuery · AJAX · HTML · CSS · JavaScript

2018/05 – 2018/09 · WordPress Developer

Two WordPress websites built for a sports journal, with custom themes developed from scratch rather than adapted from off-the-shelf templates.

• Developed and customized both WordPress themes from scratch
• Implemented required plugin functionality
• Built contact form functionality
• Set up Facebook Instant Articles integration

Tech: PHP · WordPress · HTML · CSS · JavaScript