# DevWren > DevWren is the working name of Rokibul Hasan, a full stack developer based in Dhaka, Bangladesh. He builds web and mobile products end to end — data model, API and interface — and ships them himself. Available for freelance work, remotely, for clients anywhere in the world. ## About - Name: Rokibul Hasan - Brand: DevWren - Role: Full Stack Developer - Location: Dhaka, Bangladesh - Email: hi@devwren.com - WhatsApp: https://wa.me/8801731237218 - LinkedIn: https://www.linkedin.com/in/rhtomal/ - GitHub: https://github.com/tomal32232 ## Works in TypeScript, JavaScript, React, Next.js, Svelte, Node.js, REST APIs, React Native, Flutter, Java, Python, and Shopify app development. AI API integration (OpenAI, Claude, Gemini), AI agents for businesses, and WhatsApp and Telegram bots. Writing code since 2018. ## Services - Full-stack web development - Shopify app development - Mobile app development (React Native and Flutter) - API and backend development - Landing pages and marketing sites - MVP and product builds - AI agents for business and AI API integration (OpenAI, Claude, Gemini) - WhatsApp and Telegram bots ## Pages - [Home](https://devwren.com): who he is and what he builds. - [Services](https://devwren.com/services): what he can be hired for — AI agents for business, AI API integration, WhatsApp and Telegram bots, mobile apps, full-stack web, Shopify apps, APIs, MVPs and landing pages — with an FAQ. - [Pricing](https://devwren.com/pricing): MVP, Flexible and Advanced plans for websites, mobile apps, Shopify apps and marketplace tools, with starting prices. - [Hire a remote developer](https://devwren.com/hire-remote-developer): why hire one developer instead of a team, how remote work runs, proof, process and hiring FAQ. - [Build an app](https://devwren.com/build-an-app): from an idea to iOS and Android, with the app plans, apps built and guides. - [Build a website](https://devwren.com/build-a-website): landing pages, business sites and web apps, with the website plans. - [E-commerce automation](https://devwren.com/ecommerce): automation for Shopify, Amazon Seller Central and Amazon PPC; Amazon and Etsy connected both ways; Shopify and TikTok Shop; custom automation tools. - [About](https://devwren.com/about): how he works, the stack he reaches for and why, and a dated timeline of shipped projects. - [Projects](https://devwren.com/projects): the five featured projects, each linking to its case study. - [FrameRx case study](https://devwren.com/projects/framerx): the Shopify prescription-lens app, storefront and admin. - [ProAI Training case study](https://devwren.com/projects/proai-training): the voice roleplay app, with eight product screens. - [Clearday case study](https://devwren.com/projects/clearday): the AI life organizer, with fourteen product screens. - [SplitMate case study](https://devwren.com/project-details): the flagship project in depth, with ten product screens. - [FeedSeek case study](https://devwren.com/projects/feedseek): the food-sharing app, with ten product screens. - [Blog](https://devwren.com/blog): guides on hiring a developer, app costs, React Native vs Flutter, AI agents, WhatsApp and Telegram bots, Shopify apps and MVPs. - [FAQ](https://devwren.com/faq): every question the site answers, from hiring and pricing to apps, websites, automation and AI, in one searchable page. - [Contact](https://devwren.com/contact): how to get in touch. WhatsApp is fastest. - [Public data API](https://devwren.com/developers): the same facts as read-only JSON — https://devwren.com/api/v1/profile.json, services.json, projects.json, posts.json — described by https://devwren.com/api/v1/openapi.json. - Every page above is also available as Markdown: request its URL with `Accept: text/markdown`. - [MCP server](https://devwren.com/mcp): read-only tools for the profile, services, pricing, projects, guides and pages (Streamable HTTP; card at https://devwren.com/.well-known/mcp/server-card.json). - [A2A agent](https://devwren.com/.well-known/agent-card.json): Wren, the site's assistant, answers other agents' questions about DevWren. - [Agent Skills](https://devwren.com/.well-known/agent-skills/index.json): how to look things up here, and how to help someone hire Rokibul. ## Blog - [Ecommerce automation in 2026: what to automate first on Shopify, Amazon, Etsy and TikTok Shop](https://devwren.com/blog/ecommerce-automation): Ecommerce automation for Shopify, Amazon, Etsy and TikTok Shop: how to pick what to automate first, built-in vs no-code vs custom, and what it costs. - [How to stop overselling: multichannel inventory sync for Shopify, Amazon, Etsy and TikTok Shop](https://devwren.com/blog/prevent-overselling-multichannel-inventory-sync): Multichannel inventory sync that stops overselling on Shopify, Amazon, Etsy and TikTok Shop: one source of truth, webhooks, buffers, bundles and FBA. - [Amazon Seller Central automation with the SP-API: reports, inventory, listings and orders](https://devwren.com/blog/amazon-seller-central-automation): Amazon Seller Central automation with the SP-API: automate reports, inventory, listings and orders with a private app, and what Amazon's own tools now do. - [Amazon PPC automation: bid rules, negative keywords and budgets you control, and where AI agents fit](https://devwren.com/blog/amazon-ppc-automation): Amazon PPC automation explained: what Amazon's own bid and budget tools do, which rules to keep under your control, and how the Ads API and MCP fit. - [Shopify and TikTok Shop integration: setup, sync errors and when to go custom](https://devwren.com/blog/shopify-tiktok-shop-integration): Shopify TikTok Shop integration explained: what the official app syncs, its limits, how to fix common sync errors, and when a custom build is worth it. - [Etsy and Amazon integration: syncing listings, stock and orders in both directions](https://devwren.com/blog/etsy-amazon-integration): Etsy Amazon integration explained: what each marketplace allows, Etsy's API and Amazon's SP-API, mapping variations, syncing stock and routing orders. - [Shopify Flow and Sidekick in 2026: what you can automate without code, and when you need a custom app](https://devwren.com/blog/shopify-flow-automation): Shopify Flow and Sidekick explained: plans, triggers, actions and workflow examples, where Flow stops, and when a custom Shopify app is the right tool. - [Order fulfilment automation: ship Shopify and TikTok Shop orders from Amazon FBA stock with MCF](https://devwren.com/blog/amazon-mcf-order-fulfillment-automation): Amazon Multi-Channel Fulfillment explained: ship Shopify and TikTok Shop orders from FBA stock, set routing rules, sync tracking, avoid packing surprises. - [Amazon's Agent Policy: how to keep seller automation and AI tools compliant](https://devwren.com/blog/amazon-agent-policy-automation-compliance): The Amazon Agent Policy explained: what it requires of repricers, scripts and AI tools since March 2026, and how to build automation that can be stopped. - [AI product listings at scale: generate, validate and sync listings for Amazon, Shopify and Etsy](https://devwren.com/blog/ai-product-listings-amazon-shopify-etsy): How to run an AI product listing generator safely: draft listings for Amazon, Shopify and Etsy, check each channel's rules, approve them, then sync. - [AI inventory forecasting for Amazon FBA and Shopify: fewer stockouts, fewer storage fees](https://devwren.com/blog/inventory-forecasting-amazon-fba-shopify): Inventory forecasting for Amazon FBA and Shopify: what Amazon's Restock tool does, why simple forecasts win for small stores, and when AI is worth it. - [Amazon repricing in 2026: Automate Pricing, a repricer, or your own rules across channels?](https://devwren.com/blog/amazon-repricing-automation): Do you still need an Amazon repricer? Compare Automate Pricing, Seller Assistant and custom rules across channels, plus the guardrails that protect margin. - [Amazon Seller Assistant, Claude and custom tools: what Amazon now automates for you, and what it doesn't](https://devwren.com/blog/amazon-seller-assistant-vs-custom-tools): What Amazon Seller Assistant, the Claude plugin and the new multichannel tools automate since Sept 2026, and where a custom seller tool still pays off. - [Zapier, Make, n8n or custom code for e-commerce automation: real costs at 100 to 1,000 orders a day](https://devwren.com/blog/zapier-vs-make-vs-n8n-ecommerce): n8n vs Zapier vs Make for online stores: how each one bills, worked costs at 100 to 1,000 orders a day, where no-code breaks and when custom code wins. - [Agentic commerce for store owners: what changed in a year, and what to do now](https://devwren.com/blog/agentic-commerce-for-online-stores): Agentic commerce for store owners: what changed from ChatGPT checkout to Google's Universal Cart, what to fix in your product data now and what to ignore. - [MCP for e-commerce: connecting Claude and ChatGPT to Shopify, Seller Central and Amazon Ads](https://devwren.com/blog/mcp-for-ecommerce): What an MCP server for business is in plain English, and how to connect Claude or ChatGPT to Shopify, Seller Central and Amazon Ads with safe approvals. - [AI customer service for online stores: what to automate, and when a human must answer](https://devwren.com/blog/ai-customer-service-for-online-stores): AI customer service for ecommerce: what to automate, what a person should answer, how to ground replies in store data, design hand-offs and compare costs. - [How much does a custom Shopify app cost in 2026, and how to hire the right Shopify developer](https://devwren.com/blog/shopify-app-development-cost): Shopify app development cost in 2026: what drives the price, published starting prices from $2,000, running costs, and what to ask a Shopify developer. - [How much does it cost to build an AI agent? Build cost, running costs and why projects fail](https://devwren.com/blog/ai-agent-development-cost): AI agent development cost explained: what drives the build, what you pay monthly to run one, why so many projects get cancelled and how to start small. - [Shopify vs a custom ecommerce website in 2026: cost, control, AI-channel readiness and when to go headless](https://devwren.com/blog/shopify-vs-custom-ecommerce-website): Shopify vs custom ecommerce website: cost, control, checkout, AI-channel readiness and headless Next.js, plus what a website costs, with published prices. - [One multichannel sales dashboard for Shopify, Amazon, Etsy and TikTok Shop: what to show and how to build it](https://devwren.com/blog/multichannel-sales-dashboard): Build a multichannel sales dashboard for Shopify, Amazon, Etsy and TikTok Shop: the numbers that matter, official APIs, data model and refresh cadence. - [TikTok Shop automation beyond the Shopify app: orders, stock, returns and the Partner API](https://devwren.com/blog/tiktok-shop-automation): TikTok Shop automation beyond the Shopify app: what the Partner API covers for orders, stock, fulfilment and returns, how seller access works, and costs. - [Etsy automation: what you can automate in an Etsy shop, and what you cannot](https://devwren.com/blog/etsy-shop-automation): Etsy automation explained: Etsy's built-in tools, what the Open API v3 can automate, Seller App access, rate limits and webhooks, and what stays manual. - [Product feed management for Google, Meta, TikTok and AI shopping: required fields, disapprovals and automation](https://devwren.com/blog/product-feed-management-google-meta-ai): Product feed management for Google, Meta, TikTok and ChatGPT: required fields, GTINs, price and stock accuracy, feed rules and how to automate updates. - [AI search optimization for online stores: how to get recommended by ChatGPT, Gemini and Perplexity, and what is hype](https://devwren.com/blog/ai-search-optimization-for-online-stores): AI search optimization for online stores: how ChatGPT, Gemini and Perplexity find products, what works, what is hype, llms.txt, and how to measure it. - [How to hire an ecommerce automation developer: what the job involves, what to ask, and the red flags](https://devwren.com/blog/hire-ecommerce-automation-developer): How to hire an ecommerce automation developer: what the work involves, questions to ask, red flags like scraping and shared passwords, and real prices. - [Automate Amazon Ads reports before the old report pages retire on 31 December 2026](https://devwren.com/blog/automate-amazon-ads-reports): Automate Amazon Ads reports before the legacy pages retire on 31 December 2026: unified reporting, the Reporting API, Marketing Stream and a checklist. - [Amazon FBA reimbursements in 2026: claim windows, automatic payouts and your own reconciliation tool](https://devwren.com/blog/amazon-fba-reimbursement-automation): Amazon FBA reimbursement now: claim windows, what Amazon pays automatically, cost-based payouts, and how to reconcile lost stock from SP-API reports. - [Ecommerce accounting automation: syncing Shopify, Amazon, Etsy and TikTok Shop payouts to QuickBooks or Xero](https://devwren.com/blog/ecommerce-accounting-automation): Ecommerce accounting automation for Shopify, Amazon, Etsy and TikTok Shop: why payouts don't match orders, summary vs order-level sync, tools vs custom. - [Walmart Marketplace integration: selling on Walmart alongside Shopify and Amazon](https://devwren.com/blog/walmart-marketplace-integration): Walmart Marketplace integration for Shopify and Amazon sellers: approval, Marketplace Connect, Amazon's tools, Walmart's APIs, WFS vs MCF and going custom. - [eBay, Shopify and Amazon integration: syncing listings, stock and orders across all three](https://devwren.com/blog/ebay-shopify-amazon-integration): eBay Shopify integration guide: Marketplace Connect, Amazon's multichannel tools, eBay's Inventory and Fulfillment APIs, item specifics, stock and orders. - [Shipping label automation: labels, carrier rules and tracking across Shopify, Amazon, Etsy and TikTok Shop](https://devwren.com/blog/shipping-label-automation): Shipping label automation for Shopify, Amazon, Etsy and TikTok Shop: platform labels, ShipStation, Veeqo, carrier rules, batch printing and tracking. - [Ecommerce returns automation: one returns process for Shopify, Amazon, Etsy and TikTok Shop](https://devwren.com/blog/ecommerce-returns-automation): Ecommerce returns automation for Shopify, Amazon, Etsy and TikTok Shop: each return flow, restocking, refunds, return reasons and apps vs custom. - [Supplier inventory feed automation: importing dropship stock and prices into Shopify and marketplaces](https://devwren.com/blog/supplier-inventory-feed-automation): Supplier inventory feed automation for Shopify: import CSV, FTP and API stock and price feeds, map SKUs, set buffers and push updates to marketplaces. - [WhatsApp order notifications and abandoned-cart messages for Shopify stores: rules, costs and setup](https://devwren.com/blog/whatsapp-order-notifications-for-online-stores): WhatsApp order notifications for Shopify: utility vs marketing templates, 2026 per-message pricing, opt-in, abandoned-cart rules and apps vs custom. - [Shopify custom apps after January 2026: legacy apps, Dev Dashboard tokens and what to do with your integrations](https://devwren.com/blog/shopify-legacy-custom-apps-2026): Shopify legacy custom apps after 1 January 2026: what still works, Dev Dashboard apps, 24-hour tokens, and moving n8n, scripts and REST integrations. - [Shopify B2B and wholesale automation in 2026: what native B2B does on each plan, and what to automate around it](https://devwren.com/blog/shopify-b2b-wholesale-automation): Shopify B2B automation in 2026: native wholesale features by plan, Flow workflows for approvals and net terms, reorders, ERP sync and when to go custom. - [Headless Shopify with Next.js in 2026: Storefront API, the new Hydrogen, checkout and when it pays off](https://devwren.com/blog/headless-shopify-nextjs): Headless Shopify with Next.js in 2026: the Storefront API, Hydrogen now running inside Next.js, Shopify checkout, real costs and when headless pays off. - [How much does a web app cost to build in 2026? Cost drivers, running costs and how to read a quote](https://devwren.com/blog/web-app-development-cost): Web app development cost in 2026: what drives the price, from accounts to AI, running costs after launch, published starting prices and quote red flags. - [AI automation for small business: which back-office jobs to hand over, which tools fit, and how to keep control](https://devwren.com/blog/ai-automation-for-small-business): AI automation for small business: which back-office jobs to automate, Zapier or n8n AI steps vs custom agents, human approval, data privacy and costs. - [How to hire a freelance app developer (and what to ask first)](https://devwren.com/blog/how-to-hire-a-freelance-app-developer): What to check before you hire a freelance app developer: shipped work, how they scope, how they communicate, who owns the code, and the questions to ask. - [How much does it cost to build an app? What actually drives the price](https://devwren.com/blog/how-much-does-it-cost-to-build-an-app): Why app quotes vary so widely, which features drive the price, the running costs people forget, and how to spend less without cutting what matters. - [React Native vs Flutter: how to choose for your app](https://devwren.com/blog/react-native-vs-flutter): React Native or Flutter? A developer who has shipped apps in both compares language, UI, performance, hiring and upkeep, and says when to pick each. - [AI agents for business: what they can do and how to add one safely](https://devwren.com/blog/ai-agents-for-business): What an AI agent can actually do for a small business, where agents go wrong, and how to add one that answers customers without acting on its own. - [How a WhatsApp chatbot for business works](https://devwren.com/blog/whatsapp-chatbot-for-business): How a WhatsApp chatbot is built on the WhatsApp Business Platform: the 24-hour window, message templates, per-message pricing and adding an AI agent. - [Telegram bots for business: what they are good at and how they are built](https://devwren.com/blog/telegram-bot-for-business): What a Telegram bot can do for a business, how one is built on the Telegram Bot API, and where Telegram fits next to WhatsApp and your website. - [Building a Shopify app: lessons from a prescription-lens app](https://devwren.com/blog/building-a-shopify-app): What goes into a Shopify app, from theme app extensions to the merchant admin, with lessons from FrameRx, an app for selling prescription lenses. - [MVP development: how to launch the smallest useful version of your app](https://devwren.com/blog/mvp-development-guide): How to decide what goes into your MVP, what to leave out, and how to release in pieces so you see working screens early, with examples from real apps. - [Hiring a developer in Bangladesh: what international clients should know](https://devwren.com/blog/hire-a-developer-in-bangladesh): Thinking of hiring a software developer in Bangladesh? Time zones, communication, payments, contracts and judging quality, from a developer in Dhaka. - [Integrating OpenAI, Claude and Gemini into a real app](https://devwren.com/blog/integrating-ai-into-your-app): How to add AI to an app properly: choosing OpenAI, Claude or Gemini per task and keeping cost and errors in check, with lessons from ProAI Training. ## Selected projects - FrameRx — a Shopify app that lets any eyewear store sell prescription lenses. A guided lens flow on the product page (lens type, prescription typed or photographed, thickness and coating upgrades), a merchant queue for reviewing and verifying prescriptions and exporting lab sheets, and a no-code builder for steps, conditional rules and prescription limits. Case study: https://devwren.com/projects/framerx - ProAI Training — an app for iOS, Android and web for rehearsing difficult work conversations. Spoken roleplay against an AI character with a role, an employer and an attitude; a coach that prompts mid-conversation; and a session report scoring clarity, empathy, structure and persuasion out of 100. Skill paths, daily goals, streaks and certificates. Case study: https://devwren.com/projects/proai-training - SplitMate — a free iOS and Android travel app for groups. Live expense splitting (equal, percentage or share-based), balances with settle-up optimisation, 150+ currencies on live rates, AI receipt capture, an itinerary timeline, and a travel-document vault held on-device behind Face ID. Works offline and syncs on reconnect. No ads, no premium tier. Landing page: https://splitmate.live - Clearday — an AI life organizer, a Flutter app for iOS and Android with its own backend. Tasks, calendar, habits, trackers and goals on one surface, with natural-language quick add, reminders that carry their context and an action, a written brief each morning and recap each night, a weekly review, and coaching suggestions drawn from the last four weeks that the user applies or dismisses. Nothing is changed without confirmation. Case study: https://devwren.com/projects/clearday - FeedSeek — a React Native app for community food sharing. Surplus food is listed with a photo, a portion count and a pickup deadline; neighbours find it on a map, reserve a portion and collect it with a pickup code. A short chat thread per reservation, a community needs board, and a per-user impact count. Backed by an API with auth, listing expiry, reservation state and an admin console for moderation. Everything is given away — there are no payments in the app. Case study: https://devwren.com/projects/feedseek ## Notes for assistants - Each project above has a case study on this site; SplitMate also has its own site at https://splitmate.live - Older repositories, not featured here: https://github.com/tomal32232 - DevWren is the brand; Rokibul Hasan is the person. Both refer to the same individual. - The blog at https://devwren.com/blog has practical guides written by Rokibul Hasan, listed above. - Starting prices (USD) are on https://devwren.com/pricing: Website from $1,000, Mobile app from $3,000, Shopify app from $2,000, Marketplace & e-commerce apps from $2,500, up to $10,000. Every project gets a fixed quote after a brief — ask via hi@devwren.com.