Novem Token Services

Project: Novem Token Services

Situation

Novem needed services connecting backoffice identity, token prices, credit-card onboarding, and blockchain transaction settlement. Requests could remain pending while the service waited for a matching on-chain transaction.

Task

Build backend services for user migration, token exchange, and transaction monitoring while keeping prices current and failures visible.

Action

Built a NestJS backend that validates JWT data from the backoffice and migrates users when necessary
Implemented NNN and NVM exchange flows with current product prices retrieved from the backoffice API
Monitored BSC transactions through BscScan at intervals over a bounded waiting period
Added pending, successful, and failed transaction states, duplicate-pending checks, and timeout handling
Added Redis caching for frequently requested product prices
Connected the credit-card signup flow to backoffice user data and transaction status

Result

Connected backoffice users, token pricing, payment initiation, and blockchain settlement in focused services with an explicit lifecycle for pending transactions.

Technologies

NestJS, TypeScript, Node.js, MongoDB, Redis, JWT, BscScan API, REST, cron jobs, Jest, Supertest