Technology Stack

Technology choices should serve the workflow.

This is not a logo wall. It documents technologies verified across selected Zelvian projects and explains the purpose they serve.

HTML / CSS / JavaScript — public web experiences and lightweight interfaces.

Flutter — cross-platform application and admin experiences where used.

Node.js — server-side application logic in selected systems.

Express — HTTP APIs and backend routing in selected deployments.

PostgreSQL — structured operational data, transactional relationships and reporting.

Firestore — application data where document-oriented Firebase patterns are appropriate.

Redis — supporting cache / readiness-dependent workflows where configured.

Render — deployment for selected backend/web services.

Firebase — authentication and related application services where used.

PWA — installable business web experiences with custom service-worker handling where implemented.

WhatsApp Cloud API — messaging workflows where configured.

KYC / business APIs — external verification integrations in approved projects.

Google Analytics 4 — public website analytics and reporting integration.

Fit the data and workflow before choosing a fashionable stack.
Prefer maintainable, well-supported technologies.
Separate application, service and data responsibilities when complexity justifies it.
Avoid adding infrastructure that does not solve a real requirement.

A technology appearing here means it is used across selected Zelvian work. It does not mean every product uses every technology.

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