Praduan Saha: product designer and front-end designer

A multi-specialty health platform built so the patient stops being the integration layer: one record that carries a prescription to the pharmacy, a test order to the lab, and the result back to the doctor who asked for it. Patient, clinician and operations are three surfaces over one token system, and the safety rules constrain the interface rather than decorate it. You can open it and use it on this page.

• Product Design
• Design System
• Interaction Design
• Prototyping

An autonomous bookkeeping agent for small businesses, where the real subject isn't bookkeeping; it's trust: how much authority an owner hands a system that moves their money. Built from a functional spec that marks every requirement Tested, Intent or Hypothesis, so its guesses are labelled as guesses. The working build enforces its own rules in the database rather than the interface: an append-only ledger, and two safety rails no setting can reach. You can open the books and use it on this page.

• Product Design
• Design System
• Brand Identity
• Full-Stack Prototyping

A brand identity, a design system, and a working multi-tenant B2B SaaS platform: built from a functional spec that admitted it had no signature. Sixteen views, a real permissions engine, and paywalls that actually gate. You can sign in and use it on this page.

• Brand Identity
• Design System
• Product Design
• Prototyping

A custody ledger for third-party logistics warehousing, where the operator holds goods it does not own. Stock is a derived balance and never an editable field: there is no quantity input anywhere in the system, and the roles matrix marks setting one Impossible for every role including Tenant Admin. Fifty-one screens across four shells, each annotated with the requirement it exists to make visible. You can walk all of it on this page.

• Product Design
• Design System
• Interaction Design
• Front-End Prototyping