About eSellar POS
We're on a mission to transform how businesses manage sales, inventory, and customer relationships.
Our Story
eSellar POS was born from a simple observation: traditional POS systems were slow, outdated, and relied on inefficient polling mechanisms that drained resources and delivered stale data.
Our team of engineers and business experts set out to build something better. We combined cutting-edge technologies like Next.js 16, Fastify, and Neon PostgreSQL with a revolutionary zero-polling SSE architecture.
The result? A POS system that delivers instant real-time synchronization across all devices, reduces server load by 90%, and provides an experience that truly transforms how businesses operate.
By The Numbers
Our Mission
Simplicity
Making complex operations simple and intuitive for everyone on your team.
Speed
Delivering lightning-fast performance with zero delays in data synchronization.
Customer Success
Your success is our success. We're committed to helping you grow and thrive.
Excellence
Building the best POS system in the world, one feature at a time.
Technology Stack
We use the latest and most reliable technologies to ensure your POS system is fast, secure, and scalable.
Next.js 16
React 19 with Partial Prerendering for optimal performance and SEO
ORPC
100% type-safe API calls with Zod validation. No fetch(), no runtime errors.
Fastify 5
Ultra-low overhead API server, 20% faster than Express with native TypeScript support
Neon PostgreSQL
Serverless database with auto-scaling, point-in-time recovery, and branching
Prisma ORM
Type-safe database access with automatic migrations and query optimization
TanStack Query
Intelligent data fetching, caching, deduplication, and optimistic updates
SSE (Server-Sent Events)
Zero-polling real-time updates pushed instantly when data changes
Tailwind CSS v4
Utility-first styling with zero runtime overhead and instant builds
shadcn/ui
Beautiful, accessible React components built with Radix UI primitives
Turborepo
Monorepo architecture with shared packages, parallel builds, and optimized CI/CD
Technical Architecture
Zero-Polling SSE Architecture
- • SSE-triggered refetching eliminates ALL polling requests
- • Updates pushed instantly when data changes
- • One SSE connection per organization for isolated updates
- • Auto-reconnect with 3-second backoff on disconnect
- • Battery-friendly for mobile devices
Type-Safe APIs with ORPC
- • 100% ORPC coverage with Zod schema validation
- • Zero runtime type errors at API boundaries
- • Compile-time error detection for all API calls
- • End-to-end type safety from database to UI
- • Shared types in monorepo - single source of truth
High-Performance Backend
- • Ultra-low overhead (20% faster than Express)
- • Plugin architecture for modular & maintainable code
- • Native TypeScript - full type safety throughout
- • Built-in SSE support for real-time updates
- • JSON Schema validation for fast request parsing
Serverless Database
- • Serverless & auto-scaling PostgreSQL
- • Prisma ORM for type-safe database access
- • Point-in-time recovery (30-day data retention)
- • Database branching for safe migrations
- • Automatic read replicas for analytics queries
Join Our Journey
Be part of the future of point of sale systems. Try eSellar POS today and experience the difference.
Our Team
A diverse team of engineers, designers, and business experts passionate about building better tools.
Engineering
Building the core technology stack and real-time architecture
Design
Creating intuitive and beautiful user experiences
Customer Success
Ensuring every business succeeds with our platform