Open to remote roles & contracts worldwide

I build backend systems that don’t break under real load.

Multi-tenant SaaS, high-throughput Laravel APIs, courier and payment integrations, and database layers that stay fast when traffic arrives.

Founder and software architect behind Vendzoo.com. Engineering production systems for French enterprise teams and global clients since 2022 — available for full-time remote roles, dedicated team collaboration, and client projects.

View selected work Get in touch
4+
Years experience
10+
Production systems
3+
Countries served
Kamruzzaman Polash — Laravel & SaaS Backend Engineer

01 — Selected work

Systems in production.

Real architectures with measurable outcomes, built to survive commercial load rather than to demo well.

Flagship SaaS

Vendzoo — Omnichannel Retail & Commerce Engine

Founder & Architect04/2026 – Present
vendzoo.com ↗

An all-in-one business management SaaS for multi-branch retailers, merchants and online brands. Unifies physical POS registers, Shopify and WooCommerce inventory, and multi-courier dispatch into a single automated operational platform.

✓Order and stock sync: Webhook-driven order import from Shopify and WooCommerce with stock deduction, stock restore on cancellation, and on-demand catalog stock sync.
✓Automated logistics: One-click consignment dispatch across Pathao, Steadfast, RedX and CarryBee.
✓Fraud scoring: Heuristic cash-on-delivery risk score from order history, courier delivery history and phone consistency.
✓Built-in accounting: Double-entry ledger with Telegram order alerts and daily sales summaries.
LaravelPHPMulti-tenant SaaSShopify & WooCommerceCourier APIsCOD fraud scoring
Enterprise Platform

Payslip Platform — Annon IT

Enterprise client · France08/2024 – 09/2025

European-standard payslip generation platform integrating French statutory tax APIs with automated enterprise tenant lifecycle and SSO workspace provisioning.

✓Statutory compliance: Seamless integration with Pappers API & Mon Entreprise REST APIs.
✓−59% Provisioning time: Automated tenant onboarding, cutting manual engineering setup.
✓Containerized architecture: Robust Docker & Kubernetes cluster deployment with audit-proof PDF outputs.
✓Reduced overhead: 2 costly external vendor dependencies eliminated.
LaravelDockerKubernetesPappers APIMulti-tenancy SSOVue.js
−59%Provisioning time
2Vendors removed
Retail SaaS

SellsBook — SaaS POS & WooCommerce Sync

Multi-tenant retail POS10/2025 – Present

Multi-tenant POS and inventory system with real-time WooCommerce webhooks, fraud detection alerts, and integrated local payment gateways.

✓Zero inventory drift: Bidirectional webhook engine prevents overselling between in-store and online channels.
✓Local payment integrations: Production bKash and SSLCommerz automated payment reconciliation.
✓Courier automation: Automated consignment generation and real-time delivery status polling.
✓Financial clarity: Live P&L ledger reporting for daily store audits.
LaravelWooCommerce webhooksbKash & SSLCommerzMySQL
Industrial Logistics

FlameFlow — LPG Cylinder Inventory + POS

Industrial cylinder logistics & POS04/2025 – 07/2025

Specialized cylinder tracking, security-deposit accounting, and driver route delivery manifests for an industrial LPG distribution network.

✓Zero cylinder loss: Serialized batch tracking of full vs empty cylinders throughout distribution.
✓Deposit accounting: Strict accounting ledger managing customer security deposits on cylinder shells.
✓Route manifests: Driver dispatch routes and automated trip reconciliation in FilamentPHP.
✓Automated auditing: Daily warehouse reconciliations with zero discrepancy reports.
LaravelFilamentPHPCylinder lifecycle engineMySQL
Commerce Engine

DropShop — Variant Inventory & Live Tracking

E-commerce & delivery tracking06/2025 – 08/2025

High-throughput variant-based e-commerce platform integrated directly with Pathao courier APIs for hands-free fulfillment.

✓Hands-free dispatch: Instant consignment booking upon checkout via Pathao API.
✓Live customer tracking: Real-time parcel status webhooks keeping customers informed.
✓Complex variant matrix: Multi-attribute SKU stock tracking without database slowdowns.
✓Operations speed: Eliminated manual data entry for warehouse logistics staff.
LaravelPathao APIInventory managementMySQL
Open Source

pola5h/laravel-flags

Open-source package · Packagist09/2024
GitHub ↗

An open-source Laravel package providing 249 country flags and 210 language flags through clean Blade components.

✓249 Country Flags: High-quality SVG assets rendered as zero-dependency Blade components.
✓210 Language Flags: ISO-compliant language identifiers for multilingual applications.
✓Composer installation: Published on Packagist with automated asset publishing and caching.
LaravelBlade componentsComposerOpen source

02 — About

I care about the parts of software nobody demos.

I'm Kamruzzaman Polash, a backend software engineer specialising in Laravel, PHP, and custom WordPress/WooCommerce plugin development. I build the systems that hold a product together: billing engines, inventory ledgers, background queues, and the integrations that make separate tools behave like one platform.

I founded and architect Vendzoo.com, an all-in-one e-commerce management SaaS, and authored Vendzoo Connector v3.0 — the WooCommerce plugin handling real-time order sync, fraud screening and stock management.

My work spans POS billing engines, Shopify and WooCommerce sync, AI-powered automation (OpenRouter, OpenAI, Gemini), Telegram and WhatsApp Business API pipelines, courier APIs (Pathao, Steadfast, RedX, CarryBee) and database query optimisation. I like problems with a measurable before and after.

Currently open to full-time remote engineering positions, long-term team collaboration, and architecture contracts worldwide.

github.com/pola5h
View profile ↗
Kamruzzaman Polash GitHub contribution graph — 2026 coding activity
pola5h / laravel-flags PHP

249 country flags & 210 language flags as zero-dependency Blade components — published on Packagist.

03 — Capabilities

The toolbox, proven under load.

Technologies I reach for in production across high-traffic SaaS and retail applications.

Backend & frameworks

High-throughput REST APIs, versioned endpoints, clean MVCS architecture.

LaravelPHPREST APIsMVCSDesign patternsWordPress plugins

Commerce & logistics APIs

Two-way webhook sync and automated courier consignment dispatch.

Shopify APIWooCommercePathao APISteadfast APIRedX APICarryBee API

Automation & AI

Bots, marketing automation and LLM-powered background pipelines.

OpenRouter AITelegram Bot APIWhatsApp Cloud APIFacebook Marketing APIAsync workers

Database & performance

Eliminating N+1 queries, indexing execution plans, low-latency caching.

MySQL tuningComposite indexesRedis cachingN+1 auditsQuery profiling

DevOps & containerisation

Reproducible builds, cluster deployments and production Linux.

DockerKubernetesLinux serversGit workflowsPostman testing

Dashboards & TALL stack

Admin panels, reactive data tables and rapid internal tools.

FilamentPHPLivewireTALL stackVue.jsTailwind CSS

04 — Experience

Shipping in production since 2022.

Remote product teams, European enterprise clients and commerce platforms.

10/2025 – Present
Part-time · Remote
● Current
Backend EngineerNexCore IT
  • Architected and shipped backend services for 4+ e-commerce platforms and multi-channel retail SaaS systems.
  • Engineered Facebook Marketing API integration with multi-account token rotation, real-time analytics and encrypted credential storage.
  • Automated WhatsApp Business Cloud API pipelines with audience segmentation and dynamic personalisation.
  • Integrated payment gateways (bKash, SSLCommerz) and courier tracking into retail POS systems.
08/2024 – 09/2025
Full-time · Remote
Junior Software EngineerAnnon IT
  • Built European statutory-compliance payslip generation for enterprise clients in France.
  • Integrated French government administrative endpoints (Pappers API and Mon Entreprise REST API).
  • Engineered multi-tenancy and SSO workspace provisioning, cutting onboarding time by 59% and removing 2 external dependencies.
  • Managed Docker and Kubernetes deployment manifests for production stability, and integrated OpenRouter-powered AI features.
10/2023 – 07/2024
Full-time · Remote
Laravel DeveloperLomeyo LLC
  • Delivered major features across commercial TALL-stack applications (Adlisting, JobPilot, JobFlix).
  • Maintained unit and feature test suites with PHPUnit for reliable staging deployments.
  • Integrated recurring payment gateways for subscription billing workflows.
01/2023 – 05/2023
Onsite · Dhaka, Bangladesh
Web Application DeveloperThe Riser IT
  • Built an Asset Inventory System with Laravel and normalized relational database design.
  • Executed QA on school management software, logging and resolving 30+ defects.
  • Delivered client web portals with fast load times and clean on-page SEO.
Academic Education 2018 – 2022

B.Sc. in Computer Science and Engineering

International University of Business Agriculture and Technology (IUBAT)

Thesis: Machine Learning Approaches for PE Header Based Multinomial Malware Classification

Verified Skill Software Engineer
HackerRank verified · ID f9a5e1282fde
↗
Verified Skill SQL (Advanced)
HackerRank verified · ID 835eaf3e625c
↗

05 — Engineering writing

Notes from production.

Deep dives and architectural patterns written from commercial systems I actually shipped.

Laravel Queue Workers in Docker: Why They Die & How to Fix It

Stop Laravel queue workers crashing in Docker: Supervisor config, --max-time, --max-jobs, memory leaks, OOM kills, and Horizon vs queue:work.

September 2026·15 min read
Laravel AI SDK + OpenRouter: A Complete Guide

Build production AI features in Laravel 13 with first-party AI SDK and OpenRouter: agents, streaming, queuing and tests.

April 2026·14 min read
Why Your Laravel Queue Workers Die (and the Fix)

Debugging memory leaks, supervisor timeouts, job retries and Redis connection drops in high-throughput environments.

March 2026·12 min read
MySQL Query Optimisation in Laravel: Stop Full Table Scans

Composite index strategies, EXPLAIN plan analysis and eliminating slow queries on multi-million row production databases.

February 2026·12 min read
Laravel REST API: Auth, Versioning & Best Practices Guide

Clean architecture for enterprise REST APIs: Sanctum authentication, request validation, API resources and rate limiting.

January 2026·15 min read
Deploy Laravel with Docker & Kubernetes: Zero Downtime

Multi-stage Docker builds, PHP-FPM / Nginx optimization, ConfigMaps and rolling cluster updates without downtime.

December 2025·10 min read
Read all 17 articles →

06 — Work with me

Services & collaboration.

Direct access to the engineer who builds it — no agency, no middlemen. You get clear milestones, fast delivery, and code you actually own.

SaaS & Backend Systems Most popular

Your SaaS will scale — and you won't wake up to a broken server at 3 AM.

I build multi-tenant platforms that support thousands of users from day one. Permissions, billing flows, team workspaces — all architected cleanly so your dev team can move fast without tech debt piling up.

Technical implementation
  • Multi-tenant DB schema with row-level & schema-level isolation
  • Clean MVCS / Domain Action patterns — zero spaghetti
  • Spatie RBAC, Sanctum / OAuth2 secure auth flows
  • Postman API specs & automated test suites on every endpoint
See case studies Discuss your platform
What you get
  • ✓Multi-tenant engine — users never see each other's data
  • ✓Scalable REST API with full OpenAPI documentation
  • ✓Role-based access — granular permissions per workspace
  • ✓Automated test suite covering every critical flow
E-commerce & Integrations

Your orders flow automatically — from checkout to courier, zero manual work.

WooCommerce, custom Laravel shops, courier API integrations (Pathao, Steadfast, RedX), Facebook Catalog sync — I wire it all together so your team stops copy-pasting orders and starts growing.

Technical implementation
  • WooCommerce–Laravel plugin architecture & webhook sync
  • Courier API integrations with automatic tracking updates
  • Facebook Product Catalog & dynamic ad feeds
  • Payment gateway setup (SSLCommerz, bKash, Stripe)
View commerce projects Discuss your store
What you get
  • ✓End-to-end order automation — no more manual entry
  • ✓Live courier tracking pushed to customer & dashboard
  • ✓Facebook & Instagram dynamic ad product sync
  • ✓Multi-gateway payment support with refund flows
Marketing & Messaging APIs

Your business talks to customers automatically — on WhatsApp and Facebook, 24/7.

WhatsApp Business API for order alerts, OTPs, and support flows. Facebook Conversions API to fix broken pixel tracking and recover your ad ROAS after iOS changes. More conversions, less ad spend.

Technical implementation
  • WhatsApp Business API — templates, flows & webhooks
  • Facebook Conversions API (CAPI) server-side tracking
  • Automated notification pipelines (order → OTP → support)
  • Campaign performance dashboards & custom reporting
See integration work Discuss your campaigns
What you get
  • ✓WhatsApp automated flows — order, OTP, support
  • ✓Server-side conversion tracking — fix your ROAS
  • ✓Reliable message delivery with retry logic
  • ✓Real-time analytics dashboard for campaigns
Performance & Infrastructure

Your app is slow and crashing under load. Let's fix it — permanently.

I audit your queries, queues and server setup, then fix the real bottlenecks.

Technical implementation
  • MySQL EXPLAIN audit — index tuning & N+1 elimination
  • Redis Horizon queue workers with retry & failure handling
  • Production Docker Compose & CI/CD pipeline setup
  • OOM crash prevention & memory profiling
View infrastructure work Book a technical audit
What you get
  • ✓Full DB query audit report with fix recommendations
  • ✓Redis queue infrastructure — reliable background jobs
  • ✓Docker staging + production setup with zero-downtime deploys
  • ✓Post-audit performance benchmark comparison
AI & Automation Growing demand

Add AI to your product — without rebuilding everything from scratch.

I integrate AI features directly into your existing Laravel backend. Chatbots, automated content pipelines, intelligent scoring engines, LLM-powered workflows — shipped as production-grade background jobs, not fragile scripts that break in a week.

What I've shipped
  • OpenRouter / OpenAI / Gemini API integration in Laravel
  • AI-powered fraud & risk scoring engines (COD, payments)
  • LLM background pipelines — queued, retried, monitored
  • WhatsApp & Telegram bots with AI response flows
See AI integration work Discuss your use case
What you get
  • ✓AI features inside your app — not a separate fragile tool
  • ✓Queued & retried LLM calls — no dropped responses
  • ✓Cost-controlled prompts with caching & fallback models
  • ✓Full test coverage on every AI integration endpoint

07 — FAQ

Common questions.

What services do you offer?+

Laravel web application development, REST API design, AI feature integration (OpenRouter, OpenAI, Gemini), MySQL database optimisation, Docker and Kubernetes deployments, Facebook Ads API integration, WhatsApp Business API automation, and WooCommerce–Laravel plugin development. Available for remote work worldwide.

Are you available for remote work and team roles?+

Yes. I am available for full-time remote engineering roles, dedicated contract collaboration, and technical advisory with teams worldwide (USA, UK, Europe, Canada, Australia). English communication with flexible overlap across US/EU business hours.

What technologies do you specialise in?+

Laravel, PHP, MySQL, Docker, Kubernetes, REST APIs, MVCS architecture, Livewire, FilamentPHP, the TALL stack, OpenRouter AI, Facebook Ads API, WhatsApp Business API, and WooCommerce.

How does pricing work?+

Every engagement is structured around transparent milestone-based deliverables or technical advisory retainers, defined during our initial discovery discussion. You receive a concrete scope of work, timeline, and deliverables before development begins — zero hidden costs or arbitrary billing.

How quickly will I hear back?+

I reply to enquiries within four hours on business days, and most projects can start within 48–72 hours of agreeing the scope.

What do I receive at handover?+

The full source in your GitHub or GitLab, a README with local setup, a Postman collection covering every endpoint, database migrations and seeders, and post-delivery bug-fix support. You own 100% of the code.

08 — Contact

Let's build something that holds up.

Hiring for a full-time remote role, looking for dedicated team collaboration, or have a project that needs scaling? Drop a message or reach out directly.

Direct Channels
Emailkzaman3055@gmail.com WhatsApp+880 1791 296967
LocationMymensingh, Bangladesh
ResponseWithin 4 hours, business days
Send a Project Brief