Ledger Loop

Project Overview

Ledger Loop is a full-stack accounting platform built for small and medium businesses who need professional-grade bookkeeping without enterprise complexity. The product covers end-to-end workflows: creating and sending invoices, reconciling bank and payment data automatically, handling multiple currencies, and connecting to banks and gateways (e.g. Stripe, Plaid) for real-time visibility. We delivered a multi-tenant SaaS that scales from sole proprietors to growing teams, with clear UX and reliable reporting so clients can close books faster and make decisions with confidence.

Problem

Small businesses were spending hours on manual bookkeeping, reconciling spreadsheets with bank statements, and juggling data across invoicing tools, payment processors, and bank portals. Reconciliations were often delayed by days or weeks, leading to cash-flow blind spots and audit risk. Fragmented tools meant no single source of truth, duplicate data entry, and difficulty supporting multiple currencies or bank accounts. The client needed a unified, trustworthy platform that could replace this patchwork and still feel approachable for non-accountants.

Solution

We designed and built a multi-tenant SaaS from the ground up: a Fastify REST API with Prisma ORM for type-safe data access, a React frontend for dashboards and workflows, and integrations with Stripe and Plaid for payments and bank feeds. We introduced automated bank sync and rule-based transaction categorization so most reconciliations run with minimal manual work. A clear, role-aware UX (invoicing, reconciliation, reporting) reduced reconciliation time by 70% in early adopters and made month-end close predictable. The platform supports multi-currency and multi-entity setups so SMBs can grow without switching tools.

Technology Stack

ReactFastifyPrismaMySQLStripePlaid

Architecture

Multi-tenant design with strict tenant isolation: each tenant’s data is segregated at the database level (schema or row-level) so one client’s data is never exposed to another. Bank and payment data flow in via event-driven pipelines and webhooks, with idempotent processing and retries for reliability. A dedicated reporting layer uses cached aggregates and read replicas so dashboards and reports stay fast as transaction volume grows. Auth and API access are scoped per tenant with audit logging for compliance. The stack is containerized and deployable to cloud providers for horizontal scaling and high availability.

Results

• 70% reduction in reconciliation time
• 500+ SMBs onboarded in first year
• 99.9% uptime since launch