10+ Years building software

Joyonto Kumar Sarker

Senior Full-Stack Software Engineer ·Founder & CEO of Deveable

I design and build reliable, high-scale web platforms — from multi-tenant SaaS and ERP systems to payment infrastructure. I care about clean architecture, performance, and software that ships.

View Projects Contact Me
Experience
10+ Years
Based in
Bangladesh
Focus
SaaS · Systems
export defaultfunction handler() {return <Hero />}
CICDLive

$ npm run build

✓ ready in 4.2s

main · develop

GET/api/v1/posts

200 OK

Database
Cloud
Nuxt
Docker
Laravel
Vue
Redis
MySQL
GitHub

About

A senior engineer who ships reliable software at scale.

With 10+ Years of experience, I build the systems businesses run on — multi-tenant SaaS, ERP, POS, and the APIs that connect them. I care about clean architecture, measurable performance, and software that stays maintainable as it grows.

From first line of code to production rollout, I own the full lifecycle: system design, frontend engineering, reliability, and the small details that separate good software from great software. I work with teams and founders to turn ambitious ideas into dependable products.

  • SaaS Platforms
  • ERP & Business Software
  • POS Systems
  • APIs & Integrations
  • System Design
  • Performance
  • Scalability
  • Team Leadership

Selected Work

Featured projects

A selection of platforms I've designed and engineered — built for real businesses, at real scale.

Store #014 · Dhaka

POS · Live Sales

Store #014 · Dhaka

Live

Today

$8,920

+12%

Orders

312

+24

Avg / ticket

$28.6

+3%

Sync

Live

OK
  • Order #104212:42 PM · Paid$240.00
  • Order #104112:38 PM · Paid$64.50
  • Refund12:30 PM-$18.00

Multi-Tenant POS SaaS

Lead Engineer

Cloud-based point-of-sale platform serving 500+ retail locations with real-time inventory sync, offline-first registers, and unified reporting.

  • Laravel
  • Vue
  • MySQL
  • Redis
  • Docker

Impact 40% faster checkout · 99.98% uptime across tenants

Code Live Demo
Orders · Payouts

Marketplace

Orders · Payouts

Live

GMV

$2.1M

+22%

Orders

9,842

+310

Publishers

1,206

+44

Payouts

On time

100%
  • TechCrunch-style blogDA 64 · $320Placed
  • Finance weeklyDA 51 · $210Pending
  • Health magazineDA 48 · $180Placed

Guest Posting Marketplace

Full-Stack Engineer

B2B marketplace connecting publishers and marketers with automated order routing, quality scoring, and payout reconciliation.

  • Nuxt
  • Laravel
  • PostgreSQL
  • Stripe

Impact $2M+ GMV processed with automated workflows

Code Live Demo
Greenfield Int. School

School Management

Greenfield Int. School

Live

Students

1,842

+38

Attendance

96.4%

+1.2%

Teachers

96

Stable

Fees

92%

Collected
  • Class 9-A42 students98% att.
  • Class 7-B39 students94% att.
  • Exam: Mid-termAvg 76%Graded

School Management System

Architect

End-to-end platform for 200+ institutions covering admissions, attendance, exams, and parent communication.

  • PHP
  • Vue
  • MySQL

Impact 150k+ students · 60% less administrative overhead

Code
Run · March 2026

HR & Payroll

Run · March 2026

Live

Employees

1,128

+12

Payroll

$486k

On track

Leave

34

Pending

Compliance

100%

Pass
  • Engineering412 staff$210k
  • Sales238 staff$118k
  • Ops196 staff$88k

HR & Payroll

Tech Lead

Workforce and payroll platform handling complex, region-specific compliance, leave, and automated salary runs.

  • Laravel
  • Vue
  • PostgreSQL

Impact Automated 95% of recurring payroll runs

Code
Warehouse · Central

Inventory

Warehouse · Central

Live

SKUs

12,418

+210

In stock

94%

+2%

Stockouts

−30%

Improved

Turnover

6.4x

+0.4
  • Wireless mouseReorder at 200842
  • USB-C hubLow stock64
  • Monitor 24"Healthy312

Inventory Management

Engineer

Real-time inventory and supply-chain visibility for distributors with demand forecasting and low-stock alerts.

  • Node
  • Vue
  • Redis
  • AWS

Impact 30% fewer stockouts across warehouses

Code Live Demo
Operations · Finance

ERP Suite

Operations · Finance

Live

MRR

$318k

+6%

Open deals

214

+18

Invoices

98%

Paid

Tickets

12

Open
  • Acme CorpNegotiation$48k
  • GlobexProposal$22k
  • InitechWon$15k

ERP Suite

Architect

Modular ERP unifying finance, CRM, and operations behind a single, role-aware interface and event bus.

  • Laravel
  • Vue
  • MySQL
  • Docker

Impact Consolidated 6 legacy systems into one platform

Code
Performance · Live

Storefront

Performance · Live

Live

Sales

$92.4k

+27%

Sessions

61k

+14%

AOV

$84

+5%

LCP

0.9s

Fast
  • CheckoutConv 3.2%+0.6%
  • SearchConv 2.1%Stable
  • CartAbandon 21%−3%

E-commerce Platform

Lead Engineer

Headless commerce engine with sub-second storefronts, edge caching, and a flexible promotion engine.

  • Nuxt
  • Laravel
  • Redis
  • Stripe

Impact 2x conversion rate driven by performance

Code Live Demo
Gateway · Routing

Payments

Gateway · Routing

Live

Volume

$1.4M

+11%

Success

99.99%

Stable

Providers

15

Active

Latency

120ms

p95
  • Stripe62% trafficOK
  • bKash21% trafficOK
  • Dispute1 openReview

Payment Integration Platform

Engineer

Unified gateway abstraction across 15+ providers with idempotent transactions, retries, and reconciliation.

  • Laravel
  • PostgreSQL
  • Redis
  • AWS

Impact 99.99% successful transaction rate at scale

Code

Toolkit

Skills & technologies

The languages, frameworks, and practices I reach for to build dependable software.

  • PHP
  • Laravel
  • CodeIgniter
  • WordPress
  • REST API
  • C#
  • ASP.NET MVC
  • Node.js
  • Vue.js
  • Nuxt
  • JavaScript
  • TypeScript
  • MongoDB
  • MSSQL
  • Firebase
  • MySQL
  • PostgreSQL
  • Redis
  • Docker
  • Git
  • REST API
  • Tailwind CSS
  • CI/CD
  • System Design
  • Nginx
  • Linux
  • WHM/cPanel
  • Payment Gateway & Third-Party API Integration

Career

Experience

A decade of building products, leading teams, and owning systems end to end.

  1. Founder & CEO

    Deveable

    2021 — PresentBangladesh

    Key Responsibilities & Achievements

    • Founded a product studio shipping multi-tenant SaaS for retail and business customers.
    • Scaled platform to 500+ active locations with 99.98% measured uptime.
    • Set the engineering bar: type-safe codebases, CI/CD, and observability by default.

    Technologies

    • PHP
    • Laravel
    • MySQL
    • Vue.js
    • Vuetify
    • Tailwind CSS
    • JavaScript
    • REST APIs
    • Git
    • WHM/cPanel
    • Supervisor
    • Apache
    • Nginx

  2. Senior Full-Stack Developer / Technical Lead

    Rabbi IT Firm LLC

    February 2020 — 2026Bangladesh · Remote

    Key Responsibilities & Achievements

    • Developed and maintained scalable SaaS applications using Laravel, MySQL, Vue.js, and Vuetify.
    • Designed scalable database architecture and optimized performance through indexing, query optimization, Laravel Queues, Events & Listeners, and Database Transactions.
    • Built RESTful APIs and integrated payment gateways, including Stripe, PayPal, Paddle, Blockonomics, SSLCommerz, and AmarPay.
    • Developed order management, invoicing, payment processing, email automation, and newsletter modules.
    • Integrated third-party services, including Google Sheets API, WordPress API, SendPulse, Google SMTP Relay, TurboSMTP, Moz, Ahrefs, and SpamZilla.
    • Optimized application performance, security, and maintainability while managing Linux servers using WHM/cPanel, Supervisor, Apache, and Nginx.

    Technologies

    • PHP
    • Laravel
    • MySQL
    • Vue.js
    • Vuetify
    • Tailwind CSS
    • JavaScript
    • REST APIs
    • Git
    • WHM/cPanel
    • Supervisor
    • Apache
    • Nginx

  3. Senior Full-Stack Developer

    GPosting

    February 2020 — 2026Bangladesh · Remote

    Key Responsibilities & Achievements

    • Developed and maintained a guest posting and link-building SaaS platform using Laravel, Vue.js, and MySQL.
    • Built publisher, advertiser, website, and order management modules with RESTful APIs.
    • Integrated payment gateways (Stripe, PayPal, Paddle, and Blockonomics) and third-party services, including WordPress API, Moz, Ahrefs, and SpamZilla.
    • Automated order processing, invoicing, email notifications, newsletters, and WordPress publishing workflows.
    • Optimized application performance, database queries, and Linux server deployment.

    Technologies

    • PHP
    • Laravel
    • MySQL
    • Vue.js
    • Tailwind CSS
    • JavaScript
    • REST APIs
    • WordPress API
    • Git
    • WHM/cPanel
    • Supervisor
    • Apache
    • Nginx

  4. Full-Stack Web Developer

    iTrek BD

    February 2019 — 2020Bangladesh

    Key Responsibilities & Achievements

    • Developed Shoproller, a multi-tenant subscription-based POS and inventory management system using Vue.js, Node.js, Express.js, and MongoDB.
    • Built full-stack modules, including authentication, subscription management, inventory, and RESTful APIs.
    • Developed CashUp, an HR management application with QuickBooks API and Firebase integration.
    • Utilized Docker for containerized development and deployment.
    • Collaborated with cross-functional teams to deliver scalable and high-performance web applications.

    Technologies

    • Vue.js
    • Vuetify
    • Node.js
    • Express.js
    • MongoDB
    • Firebase Realtime Database
    • Docker
    • QuickBooks API
    • JavaScript
    • REST APIs
    • Git

  5. Software Developer

    SilkCity Solution

    February 2016 — January 2019Bangladesh

    Key Responsibilities & Achievements

    • Developed business applications using PHP (CodeIgniter), ASP.NET MVC 5, MySQL, and MS SQL Server.
    • Built School Management, Student Admission, Student Payroll, and Cold Storage Management systems.
    • Integrated the Dutch-Bangla Bank Mobile Banking API for online admission and tuition fee payments with real-time payment verification.
    • Designed relational databases, optimized SQL queries, and improved application performance.
    • Developed responsive web interfaces using HTML, CSS, Bootstrap, JavaScript, jQuery, and AJAX.

    Technologies

    • PHP
    • CodeIgniter
    • ASP.NET MVC 5
    • C#
    • MySQL
    • MS SQL Server
    • HTML
    • CSS
    • Bootstrap
    • JavaScript
    • jQuery
    • AJAX

  6. Junior Software Developer

    SoftcodeBD

    September 2015 — January 2016Bangladesh

    Key Responsibilities & Achievements

    • Started as an SEO & WordPress Executive, managing Amazon affiliate websites and digital marketing campaigns.
    • Managed four WordPress-based affiliate websites, including content publishing, on-page/off-page SEO, and backlink building.
    • Transitioned into software development, contributing to a Point of Sale (POS) system using PHP (CodeIgniter) and MySQL.
    • Developed a Trade License Management System for Chapai Nawabganj Pourashava.
    • Built responsive user interfaces and backend modules using CodeIgniter, JavaScript, jQuery, AJAX, and Bootstrap.

    Technologies

    • PHP
    • CodeIgniter
    • MySQL
    • HTML
    • CSS
    • Bootstrap
    • JavaScript
    • jQuery
    • AJAX
    • WordPress
    • SEO

Contact

Let's build something great together

I'm open to senior engineering roles, consulting, and ambitious product work. The fastest way to reach me is email.

[email protected]