@smsujan
Full-Stack Software Engineer | React | Node.js | TypeScript
Track record
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Projects done
New
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Availability
Full-stack software engineer with 3+ years of professional experience building commercial SaaS products across React front ends and Node.js back ends. Shipped 2 applications live on the Shopify App Store, owning both end to end: authentication, billing, APIs, database design, and user interface. Experienced in remote, English-language collaboration with international teams, and mentors junior developers through code review and pair programming.
Full-Stack Engineer
Normalize · Remote
2025-08 – 2026-09
• Shipped Better COD Form and Upsells end to end, a multi-tenant SaaS application live on the Shopify App Store serving merchant storefronts in 9 languages • Built the React front end, including a drag-and-drop form builder, template system, and 2-step onboarding flow implemented from Figma design handoffs • Developed the Node.js service layer covering REST and GraphQL integrations, OAuth 2.0 authorization, JWT session handling, and webhook consumers • Designed PostgreSQL database schemas using Prisma to model tenant configuration, order, and offer workflows, handling customer PII under data-protection requirements • Delivered a second product, a lead-collection platform built in Next.js, Express.js, and Puppeteer • Gather requirements directly from the client, scope them into releases, and report progress asynchronously across time zones • Mentor 4 interns and junior developers through code review and pair programming; use Claude Code and GitHub Copilot daily for scaffolding, refactoring, and test generation
Senior Software Engineer
OctiDev · Dhaka, Bangladesh
2025-01 – 2025-07
• Led delivery of SpeedCart from design to production, a subscription SaaS product live on the Shopify App Store with a 5-star merchant rating, including billing, free-trial handling, and tenant provisioning • Re-architected event ingestion around a message queue with idempotency guarantees after diagnosing webhook delivery failures, sustaining 100% of inbound traffic with zero data loss • Built a returns-management system covering RMA, refunds, and restocking, translating merchant policies into configurable business rules and database schemas • Developed full-stack features using Remix.js, React, GraphQL, Prisma, Sequelize, and PostgreSQL • Conducted 20+ technical interviews and mentored engineers across the team
S. M. Sujan
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Software Engineer
DevSpike · Dhaka, Bangladesh
2023-01 – 2024-12
• Built the front end of a ticketing system using React, Redux, Ant Design, and GraphQL, focused on reusable components and predictable state management • Delivered production features on Paperturn, a commercial platform with a global user base, working within an established codebase and release process • Maintained Jest and React Testing Library coverage on critical user flows, catching regressions before release • Investigated and resolved defects with no obvious root cause across unfamiliar parts of the system
Web Developer
Freelance IT Lab · Mymensingh, Bangladesh
2018-09 – 2020-03
• Built 100+ responsive client websites and web applications using HTML, CSS, JavaScript, Bootstrap, PHP, and MySQL • Gathered requirements from clients, managed revision rounds through to handover, and handled deployments and hosting via cPanel
National University, Bangladesh
B.S.S. Economics coursework
2015 – 2019
did not complete
Agricultural University College, Mymensingh
Higher Secondary Certificate (HSC), Science
Better COD Form and Upsells - Multi-Tenant SaaS Application
(Live, 2026) . apps.shopify.com/better-cod React, Remix.js, Node.js, GraphQL, REST, Prisma, PostgreSQL, OAuth 2.0, JWT | apps.shopify.com/better-cod • Owned end to end: authorization flows, service layer, database schema, tenant onboarding, drag-and-drop configuration builder, offer engine, analytics, and localization across 9 languages
SpeedCart - Subscription SaaS, Cart Recovery
(Live, 5-star rating) . apps.shopify.com/speed-cart-drawer-abandon-cart Remix.js, React, Node.js, GraphQL, Prisma, PostgreSQL | apps.shopify.com/speed-cart-drawer-abandon-cart • Subscription billing with free-trial flow, tenant provisioning, and a queue-based event pipeline with idempotency guarantees
Lead Collection Platform - Automated Data Capture
. Not Public Next.js, Express.js, Node.js, Puppeteer • Headless-browser automation pipeline capturing and structuring lead data, with a Next.js dashboard for review and export
Paperturn — Interactive Flipbook Platform
. www.paperturn.com React.js, Redux.js, Jest, React Testing Library • Developed and maintained unit and component tests using Jest and React Testing Library to improve feature stability and catch regressions before release.
PodcastingBox - AI-Powered Podcast Automation Platform
. podcastingbox.com Node.js, React, Large Language Model (LLM) APIs, Text-to-Speech APIs • Automated podcast production pipeline integrating LLM and text-to-speech APIs for content generation and AI voice synthesis
Latest News - Serverless News Aggregation Platform
. news-of-world.netlify.app Nuxt.js, Vue.js, Netlify Functions, MongoDB | news-of-world.netlify.app • Server-side rendered front end over a serverless pipeline aggregating 50+ news sources
