2025· Full-Stack Engineer — backend re-engineering and integrations

Stedi

Virtual-CFO accounting SaaS, re-engineered from a low-code Base44 prototype into a production-grade Express + Prisma + PostgreSQL backend on AWS.

Express.jsPrismaPostgreSQLAWSQuickBooks OAuth 2.0AES-256-GCM

// problem

A low-code Base44 prototype needed to become a secure, production-grade accounting platform with reliable QuickBooks sync across multiple realms.

// solution

Migrated the prototype to a production Express + Prisma + PostgreSQL backend on AWS with 28 REST endpoints, a full QuickBooks Online OAuth 2.0 flow (multi-realm), and AES-256-GCM encrypted token storage.

// outcomes

[✓]28 production REST endpoints replacing the low-code prototype
[✓]Multi-realm QuickBooks Online OAuth 2.0 integration
[✓]AES-256-GCM encrypted token storage for secure credentials

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