IoannisStavropoulos

Software engineer — web products, front to back

Contact

Available for focused product and platform work. Messy systems are welcome too.

Latest work

Line-art outbox machine accepting a message and presenting four delivery channel symbols

Backend reliability

Making Notification Delivery Recoverable

  • NestJS
  • Prisma
  • BullMQ
  • PostgreSQL

A notification could be discovered, saved, and still vanish before delivery. I rebuilt that handoff so interrupted work survives crashes, with the leftover duplicate risk spelled out.

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Line-art mascot: a smiling rotary telephone lifting its handset

Voice interfaces

Nine States for One Phone Call

  • TypeScript
  • Bun
  • XState
  • Soniox

A Greek voice prototype with a mock calendar. Nine XState states coordinate replies, queued audio, and interruptions when the caller starts talking again.

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About me

I started in 2021 building cryptocurrency exchange interfaces, then moved through production card systems into business applications. Since then I’ve worked across frontend performance, APIs, payments, queues, databases, and cloud infrastructure, where product decisions stop being abstract and start becoming machinery.

Toolbox

TypeScriptReactNode.jsPostgreSQLAWSNext.jsNestJSVueDocker