Sadman Sakib Radh

• Delivered end-to-end features across 12+ modules — accounting, inventory, hospital, HR/payroll, procure- ment — from database schema to UI. • Designed the online payment platform processed) around a pluggable gateway abstraction, with an 8-state lifecycle and row-level locking — zero duplicate charges. • Added gateway re-validation, tamper detection, and automatic compensating refunds when a receipt can- not be recorded. • Built the ERP’s dynamic dashboard framework (16 card types from database config), cutting load from 40–50s to 1–2s across 1M+ ledger rows. • Built a multi-tenant API integration hub with scoped keys, per-service authorization, and queued cross- server sync between client deployments. • Wrote 30+ queued jobs and scheduled commands; secured the API with Passport OAuth2 and policy- based authorization.

• Delivered end-to-end features across 12+ ERP modules including accounting, inventory, hospital, HR/payroll, and procurement. • Built reporting dashboards, financial data tables, and reusable Vue 3 form libraries on REST APIs. • Developed a dynamic dashboard framework with 16 configurable card types. • Reduced dashboard load time from 40–50 seconds to 1–2 seconds over 1M+ ledger rows using precomputed summary tables and browser-side caching. • Designed a pluggable payment gateway abstraction. • Implemented concurrency-safe payment callbacks with an 8-state lifecycle and row-level locking. • Added gateway re-validation, tamper detection, audit logging, and automatic compensating refunds. • Built a multi-tenant API integration hub with scoped API keys, rotation, per-service authorization, and webhooks. • Automated cross-server data synchronization using queued jobs. • Developed subscription and billing modules with invoicing, receipts, overdue detection, and RBAC. • Wrote 30+ queued jobs and scheduled commands for payroll, attendance, stock reconciliation, and synchronization. • Supported production Linux servers, deployment, slow-query profiling, debugging, and code reviews.

• Delivered frontend and backend features using React, Vue.js, Laravel, and legacy PHP. • Built attendance, reporting, and administration dashboards in React for an education platform serving 50+ institutions. • Developed a Vue.js gym reservation system with booking flows, scheduling, and member-facing screens. • Built Laravel REST APIs, business logic, and database schema changes. • Maintained and extended legacy PHP applications. • Optimized SQL queries and debugged APIs on data-heavy reporting screens. • Implemented authentication and role-based access control across admin, staff, and end-user roles, with server-side validation on every endpoint. • Worked in Agile teams using Git, Linux, and peer code reviews.