Build - Websites & Web Applications.
Custom websites, web applications, customer portals, dashboards and business systems where frontend, backend and user experience have to come together seamlessly.
ABOUT
Product engineering for systems that already have real users.
I'm Shafin Sadnan, a product engineer based in Bangladesh who builds, fixes and modernizes systems that already have real users, data and operational history, for businesses and agencies worldwide.
I stay close to the problem and the code: build new web features, connect APIs and third-party services, migrate legacy databases and systems, and diagnose complex production bugs without creating unnecessary rewrites or fragile shortcuts.
- 5 shipped systems
- 5 years in production
- 3 industries: education, wellness, local services
WHAT I WORK ON
The work usually starts with a real constraint.
Build, fix and improve is a practical framework for the problems I take on: launching websites and web apps, sorting production issues, and modernizing existing platforms without breaking what works.
Fix - Production Bugs & Broken Flows.
Production bugs, broken checkouts or booking flows, API and authentication failures, and technical debt where adding more code before understanding the root cause would make things worse.
Improve - Integrations, Migrations & Modernization.
Database and platform migrations, third-party integrations, dependency replacement, architecture cleanup and performance improvements on platforms that already have active users.
PROOF IN PRACTICE
Real systems come with history.
The engineering work I find most useful is rarely clean-sheet work. Existing products come with dependencies, data, users, business rules and earlier decisions that cannot simply be thrown away. The challenge is often changing the right part without breaking the parts that still work.
01
Tutorliy
Keep the system. Replace the dependency.
For Tutorliy, I replaced an external location-search dependency with a Bangladesh-focused local autocomplete path while preserving the existing MongoDB radius-matching logic underneath.
02
Rifat Academy
Modernize without pretending the legacy system never existed.
For Rifat Academy, the work involved modernizing a legacy WordPress/MariaDB LMS into a custom application while treating data migration, authentication and production architecture as part of the rebuild.
03
DripGym
Turn repeated delivery into a reusable system.
For DripGym, I implemented treatment-specific Shopify pages with reusable Liquid sections, structured-data work and analytics foundations so repeated page delivery did not have to start from scratch.
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:
HOW I WORK
Clarity first. Then the code earns its place.
I want the person I'm working with to understand what is changing, why it is changing, and what trade-offs come with the decision. That matters whether the collaborator is a business owner or another technical team.
- 01Understand the real problem before choosing the implementation.
- 02Keep the solution as small as it can be without making it fragile.
- 03Treat production debugging, migrations and integrations as product work, not side chores.
- 04Communicate trade-offs clearly so the next decision stays easy to make.
I keep learning from official documentation, real project evidence and experienced practitioners, then verify and adapt what is useful to the system in front of me. I would rather test an idea than repeat it because it sounds authoritative.
COLLABORATION
Direct communication, documented decisions, fewer surprises.
I can work directly with an owner who needs a technical problem translated clearly, or alongside an agency, founder or engineering team that already speaks the language. Either way, the useful part is the same: clear scope, visible trade-offs and implementation that can be reviewed. Agencies and consultants can also review the web development partner page.
I'm based in Bangladesh and work remotely, so communication and handoff need to be explicit rather than assumed.
START A CONVERSATION
Have something that needs to ship, work better, or stop breaking?
Send the problem, current context and what a good outcome looks like. From there, we can figure out the smallest sensible next step.