GSL Export Limited
01 / 04A custom export website + internal management system
Designed, built and deployed a custom web platform with role-based content management for GSL Export Limited.
Design · Full-stack · Deployment
Full-Stack Web DeveloperProduct Engineer
Build, fix and improve websites and web applications.
I help businesses and agencies launch websites and web apps, fix production problems, connect systems and modernize existing platforms with hands-on full-stack development.
- Web Development
- Production Fixes
- Integrations & Migrations
Selected Work
Selected web development work.
Four snapshots of how I build, fix and improve websites, web applications and integrations.
View live project
What I Help With
Build. Fix. Improve.
I help with new website and web app development, production debugging and focused improvements to existing platforms — including API integrations, migrations and modernization.
01CAPABILITY
Build
Websites & Web Applications
Full-stack implementation for custom websites, web applications, customer portals, dashboards and business systems — from responsive interfaces to backend APIs, data models and auth.
02CAPABILITY
Fix
Production Bugs & Broken Flows
Production debugging for broken booking flows, payment hiccups, integration failures, authentication bugs and browser/device issues that interrupt business operations.
03CAPABILITY
Improve
Integrations, Migrations & Modernization
Modernizing existing websites and web apps, connecting third-party APIs, migrating legacy CMS platforms, and replacing fragile dependencies without breaking live traffic.
STAGE: FULL-STACK ASSEMBLY
ARCH: NEXTJS / POSTGRESLIVE SCHEMATIC
COORDINATE: SYSTEM_COREISOLATION: 100% DETERMINISTIC
PRECISION DELIVERY
CAPABILITY 01LIVE SCHEMATIC
Build
Websites & Web Applications
Full-stack implementation for custom websites, web applications, customer portals, dashboards and business systems — from responsive interfaces to backend APIs, data models and auth.
Already built
Already built and live?
Most of my work starts with a website, web app or business system that already exists and has users. If something is breaking, unfinished, or no longer fits how the business works, there is usually a smaller next step than a rebuild.
For agencies & partners
Need implementation capacity without losing the client relationship?
Agencies, consultants and operators already owning strategy can route React/Next.js web development, custom integrations, workflow tools, platform modernization or rescue work to a hands-on developer — preserving client relationships and creative ownership.
DripGym
Ketamine Wellness
Rifat AcademyAgency-to-end-client delivery · Product ownership
Client Reviews
What clients say about working together.
Real client video reviews from project relationships, presented in the reviewers’ own words with the relationship and attribution kept clear.
01 / 04Saad Dar · Demand Now AI
FEATURED REVIEW · 01 / 04
Saad Dar
Demand Now AI
Drip Gym
REVIEW 01 / 04VIDEO REVIEW
Saad Dar
Demand Now AI
Drip Gym
Select Review:
NOTES FROM THE WORK
Useful things learned while shipping.
First-hand notes on architecture decisions, production debugging, migrations and implementation trade-offs from real delivery work.
Featured note
Engineering··5 min read
How to Replace Google Places Autocomplete Without Rewriting Your Matching System
How I replaced an external location-search dependency with a self-hosted OpenStreetMap + SQLite autocomplete path while keeping the existing geospatial matching logic intact.
ABOUT
Product thinking.Hands-on implementation.
I’m Md Sadnan Hossen Shafin, a full-stack web developer and product engineer working remotely with businesses and agencies. I focus on understanding the real problem, making practical technical decisions and implementing websites, web applications, integrations and fixes directly.
Md Sadnan Hossen Shafin
Full-Stack Web Developer · Product Engineer
CREDIBILITY & ROLES
01Founder & CEO
Marceline Studios
02Co-founder
Adexcell
START A CONVERSATION
Need a website, web app or technical problem sorted?
Tell me what exists today, what needs to change, and what a useful outcome looks like. I usually reply within one business day with the smallest sensible next step.