Gurwinder Singh
Senior Full-Stack Developer · SaaS, AI Integrations & Custom Software
Gurwinder Singh is the developer behind F Koin Tech. For 9+ years he has designed, built and maintained web applications, SaaS products and custom business systems for clients worldwide, with 90+ projects delivered. When you hire F Koin Tech, he is the person you talk to and the person who writes your code.
Punjab, India · Working with clients worldwide
9+
Years building software
90+
Projects delivered
30+
Clients worldwide
What I build
Scalable web applications, SaaS products and business systems, designed, built and supported by one accountable developer.
Full-Stack Web Applications
React and Next.js front ends on Node.js back ends, from customer portals to data-heavy dashboards.
SaaS Products
Multi-tenant apps with auth, roles, billing and the admin tooling a product needs to run.
AI & LLM Integrations
LLM features wired into real workflows: document handling, search, drafting, classification.
CRM & ERP Systems
Pipelines, operations and reporting built around how the business actually works.
APIs & Integrations
REST APIs, payment gateways and third-party services connected cleanly.
Maintenance & Support
Taking over existing applications, fixing what's fragile, and keeping them current.
How I work
The principles behind every engagement: what you can count on from first call to launch.
Product first, code second
Software is only worth building if it moves the business. I start with the workflow and the outcome, then engineer the simplest system that delivers it reliably.
One accountable developer
The person who scopes the work builds it and supports it. No handoffs.
Business-first decisions
Technical choices are judged by what they do for your operations and growth.
Straight communication
Realistic timelines, visible progress, and problems raised early.
Built to be maintained
Readable, documented code you own, so the system stays supportable.
The path here
Nearly a decade of shipping production software, from mobile apps to full business platforms.
Founder & Lead Developer, F Koin Tech
Scoping, architecture, development and long-term support for client systems.
Senior Full-Stack Developer
Shipped production web platforms and APIs for global clients.
Android Developer
Built and published native and cross-platform mobile apps.
MCA & BCA, Computer Applications
Formal grounding in software engineering and systems.
The stack I build on
Proven, modern technologies chosen for performance, reliability, and long-term maintainability.
Frontend
Backend
Data
Cloud & Tools
AI
Mobile
Education
MCA, Master of Computer Applications
Engagement
Direct: you work with the developer, not an account manager
Workflow
AI-assisted research, testing and documentation, reviewed by hand
Have a project in mind?
Tell me what you’re trying to build. You’ll get a clear, honest assessment and a path to ship it, straight from the person who’ll do the work.