Md. Mostasim Mahmud Tasim | Software Engineer | Backend, Full-Stack & Infrastructure

Engineering Profile

Building Reliable Software Systems

Software Engineer with professional experience across application development, backend engineering, database engineering, infrastructure, DevOps, ERP systems, healthcare technology, and automation. Currently at AI Khan Lab Ltd., designing and building laboratory management software and enterprise platforms that serve medical professionals and streamline diagnostic operations.

Backend Engineering

Python & Django
Django REST Framework
Node.js & Express.js
NestJS
PHP

Frontend Engineering

React
Next.js
HTML & CSS
Tailwind CSS
JavaScript

Database Engineering

PostgreSQL
Database Design
Query Optimization
Backup & Recovery
Replication & HA

Infrastructure

Linux & Ubuntu Server
Docker
Nginx & Apache
SSL & Reverse Proxy
Server Administration

Enterprise Systems

ERP (Dolibarr, ERPNext)
Laboratory Management
Business Process Automation
RBAC & Auth

Architecture

REST API Design
Service Architecture
Caching Strategies
Background Processing
Scalable DB Design

Professional Experience

Where I've Worked

Dec 2023 — Present

Assistant Manager – IT

Al Khan Lab Ltd.

Lead ERP implementation and customization across laboratory operations, accounts, HR, and management functions. Apply software engineering project management practices to translate operational needs into ERP configuration, custom modules, and workflow automation. Implement integrations using PHP, PostgreSQL, Python, and REST APIs. Administer PostgreSQL databases, Linux servers, Docker environments, Apache/Nginx services, backups, and production infrastructure.

PHPPythonPostgreSQLREST APILinuxNginx/ApacheDockerERP

Jan 2023 — Nov 2023

Software Engineer

Webens Technology

Developed and customized ERP solutions supporting procurement, inventory, sales, accounting, and CRM workflows for enterprise business process automation. Implemented procurement lifecycle features and built RESTful APIs and third-party integrations to improve system connectivity. Optimized PostgreSQL schemas, indexes, and queries.

ERPREST APIPostgreSQLThird-Party Integrations

Sep 2021 — Oct 2022

Jr. Software Engineer

Accelx Inc.

Developed full-stack enterprise and SaaS applications using Django, React, and PostgreSQL to support business-facing digital products. Built and maintained REST APIs for application integration, secure data exchange, and reusable backend services.

DjangoReactPostgreSQLREST API

Academic Background

Education

Currently Studying

Postgraduate Diploma in Project Management (PGDPM)

ABP, awarded by Edupro, UK & endorsed by CPD, UK

Covering project life cycle, planning, scheduling, budgeting, risk, quality, procurement, stakeholder management, and AI-integrated project management practices.

2017 — 2021

Bachelor of Science in Software Engineering

Daffodil International University, Dhaka

CGPA: 3.20 / 4.00

2017

Higher Secondary Certificate (Science)

Cambrian School & College, Dhaka

GPA: 3.75 / 5.00

2015

Secondary School Certificate (Science)

Ataturk Government Model High School

GPA: 4.17 / 5.00

Selected Engineering Work

Systems I've Built

Primary Project

Laboratory Management & Diagnostic ERP

Enterprise software architecture for pathology and diagnostic laboratory operations. Designed end-to-end system covering patient lifecycle, specimen tracking, diagnostic workflows, report generation, billing, and inventory — integrated with Dolibarr ERP on PostgreSQL with Linux production infrastructure.

DjangoDolibarr ERPPostgreSQLREST APILinuxNginxDocker

Users (Doctors · Lab Staff · Admin)

Web Application (Django · Next.js)

API / Business Logic Layer

ERP & Laboratory Modules

PostgreSQL Database

Backup · WAL · Replication

Production Infrastructure (Linux · Nginx)

System Modules

Patient Registration & Record Management
Sample Collection & Specimen Tracking
Histopathology & Cytopathology Workflow
Gross Examination Documentation with Image Integration
Doctor Module — Streamlined Lab Results Access
Automated Report Generation with Predefined Templates
Transcription Module with Voice Recognition
Inventory & Billing Management
User Roles, RBAC & Audit Trails

Engineering Highlights

Designed modular architecture enabling independent module deployment
Built PostgreSQL backup strategy with WAL archiving and PITR
Implemented secure role-based access across multiple user types
Deployed on Linux with Nginx reverse proxy and SSL termination

Enterprise Architecture / AI Khan Lab

Full-Scale Enterprise ERP Workflow Integration

As Assistant Manager – IT, I developed and managed a comprehensive enterprise ERP system interconnecting core business operations. This system automates cross-departmental workflows, ensuring real-time data synchronization between human resources, finance, inventory, and production.

Systems ArchitectureERP ImplementationWorkflow AutomationBusiness Logic

HRM & Payroll
Attendance → Salary → Tax

↔

Finance & Accounts
Central Ledger / AP & AR

↔

Asset Management
Depreciation → Maintenance

↕

Procurement & Supply
PR → PO → Vendor

→

Inventory Control
GRN → Stock Sync

→

Production & PMS
BOM → QA → Output

→

Sales & CRM
Invoice → Dispatch

Core Departmental Workflows

HR & Payroll: Tracks employee attendance, automatically calculates taxes, integrates with PMS for performance, and posts salary vouchers directly to Finance.
Procurement: Departments generate Purchase Requisitions (PR). Once approved, Procurement converts them to POs. Supply Chain handles vendor delivery.
Inventory: Goods Receipt Notes (GRN) automatically increase stock and trigger Accounts Payable for vendor invoicing.

Production & PMS: Consumes raw inventory based on Bill of Materials (BOM), logs QA checks, and transfers finished goods to sales inventory.
Asset Management: Tracks IT and lab equipment lifecycle, calculates monthly depreciation, and posts journal entries to Finance.
Finance & Accounts: The central nervous system. Automatically aggregates all AP/AR, payroll, and sales data into a unified General Ledger for real-time P&L reporting.

Project Management & Enterprise SaaS

RetailOS / Multi-Industry POS SaaS

Directed the end-to-end project management lifecycle for a multi-industry POS SaaS. Led requirement gathering, defined Agile workflows, managed cross-functional engineering teams, and delivered a 7-sprint MVP tailored for retail and service businesses.

Agile / ScrumJiraFigmaConfluenceNext.js / Node.js

Requirement Gathering & Planning

Conducted stakeholder interviews to map industry-specific needs (Pharmacy, Restaurant, Retail).
Authored Product Requirement Documents (PRDs) defining workflows, edge cases, and role-based permissions.
Translated business needs into modular technical architecture and dynamic feature-flag configurations.

Tools & Agile Workflow

Tools Used: Jira/Trello for sprint planning, Confluence/Notion for documentation, Figma for UI/UX handoffs, and GitHub for CI/CD pipelines.
Workflow: Implemented Agile Scrum methodology, breaking the MVP into 7 distinct sprints (Auth → Setup Wizard → Dashboard → POS → Inventory → Reports → AI Assistant).
Team Management: Orchestrated daily stand-ups, backlog grooming, and sprint retrospectives aligning product, design, and engineering teams.
Risk Mitigation: Identified risks early and enforced a scalable, modular architecture to ensure stable core POS functionality before introducing complex features.

Enterprise SaaS

School Management System

Comprehensive school management platform handling student information, academic schedules, attendance, exams, fees, transportation, communication, and website management as a multi-tenant SaaS.

DjangoNext.jsReactPostgreSQL

Engineering Approach

Architected multi-tenant backend with Django REST Framework
Built responsive frontend with React and Next.js
Designed PostgreSQL schema for multi-school isolation
Deployed on Hostinger VPS with automated CI/CD

Key Capabilities

Student records, attendance, and academic performance tracking
Automated scheduling, timetabling, and exam management
Fee collection with integrated payment systems
Transportation management and route optimization
Reporting and analytics dashboards

Full-Stack Platform

E-Commerce Platform

Robust e-commerce platform with ML-powered personalized recommendation system, secure payments, order management, and collaborative filtering algorithms.

Next.jsDjango RESTPostgreSQLML

Engineering Highlights

Collaborative filtering for personalized product recommendations
Secure JWT authentication and payment gateway integration
Full order lifecycle management with admin panel
Responsive design across all device types

Infrastructure

PostgreSQL High Availability Architecture

Designed and implemented PostgreSQL backup and replication infrastructure using WAL archiving, pg_basebackup, and point-in-time recovery strategies for production databases.

PostgreSQL 14+WALpg_basebackupLinux

Architecture

Configured WAL archiving for continuous transaction log backups
Implemented base backup using pg_basebackup with streaming
Built point-in-time recovery (PITR) capability
Configured standby server replication with automated failover
Managed permissions, ownership, and operational security

DevOps

Docker Infrastructure Storage Migration

Executed controlled migration of Docker's data directory to dedicated storage mount, resolving system partition space constraints while maintaining container integrity and runtime stability.

DockerLinuxStorage

Process

Migrated /var/lib/docker to /mnt/docker-data with rsync
Updated daemon.json configuration for new data root
Verified container integrity post-migration
Zero downtime during controlled migration window

Enterprise Migration

Dolibarr ERP & PostgreSQL Major Version Upgrade

Led full-stack upgrade of production Dolibarr ERP environment: PostgreSQL 14→17, PHP 7→8.2, Dolibarr 15→21, resolving schema conflicts, SQL incompatibilities, and runtime issues.

DolibarrPostgreSQLPHP 8.2UbuntuDocker

Migration Scope

Database backup and PostgreSQL major version upgrade (14→17)
PHP runtime upgrade with extension reconfiguration
Dolibarr application upgrade with schema migration
Resolution of view dependencies and SQL incompatibilities
Permissions and security hardening post-upgrade

Production & Infrastructure

Infrastructure Engineering

Practical experience administering production Linux servers, container orchestration, web server configuration, and database infrastructure.

Internet

Nginx / Reverse Proxy / SSL

Application Server (Django · PHP · Node.js)

PostgreSQL Database

Backup · WAL · Standby Replication

Linux Server Administration

Ubuntu Server setup, user management, firewall configuration, service management, and security hardening.

Docker & Containerization

Container orchestration, Docker Compose, storage management, and production container deployments.

Web Servers & SSL

Nginx reverse proxy, Apache virtual hosts, SSL/TLS termination, and domain configuration.

Database Operations

PostgreSQL administration, WAL archiving, pg_basebackup, PITR, standby replication, and migration.

Production Deployment

Zero-downtime deployments, Gunicorn/uWSGI process management, and environment configuration.

Server Security

SSH hardening, UFW firewall rules, fail2ban, user privilege management, and audit logging.

Specialization

Database Engineering

PostgreSQL as a core engineering specialization — from schema design to production operations.

Relational Database Design

Schema Design

Indexing Strategies

Query Optimization

PostgreSQL Administration

Backup & Restore

WAL Archiving

Replication & PITR

Major Version Migration

Production Troubleshooting

Data Integrity

Transaction Management

Approach

How I Engineer Systems

Understand the business problem before writing code

Design the system before implementation

Keep architecture simple and maintainable

Protect data integrity at every layer

Automate repetitive operations

Design for failure and recovery

Monitor production systems proactively

Document important architectural decisions

Optimize only where measurement justifies it

Build for long-term maintainability

Technology

Technology Ecosystem

Languages

PythonJavaScriptPHPSQL

Backend

DjangoDjango REST FrameworkNode.jsExpress.jsNestJS

Frontend

ReactNext.jsTailwind CSS

Database

PostgreSQL

Infrastructure

LinuxDockerNginxApache

Enterprise

DolibarrERPNext

Tools

GitGitHubDocker ComposepgAdmin

Open Source

Engineering on GitHub

tasim313

Explore my repositories, contributions, and open source work.

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Let's Build Reliable Systems

I'm open to engineering opportunities, software architecture projects, enterprise application development, automation initiatives, and technically challenging collaborations.

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