IRANZI Thierry

Full-stack software engineer · Kigali, Rwanda

Software Engineering student at African Leadership University (ALU) (opens in a new tab)

I ship polished product UI and the services behind it: React, Next.js and React Native on the front, TypeScript, Go and Python behind.

Product lead & Engineering at Siebenberge · previously Polar · founded an AI startup at 18 that was acquired.

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Projects7 projectsWriting1 postPhotos

About

I started coding as a kid, out of plain curiosity about how the software I used every day actually worked. Most of what I know I learned by building: first for freelance clients, then as a frontend developer at Uruti Hub in Kigali, and as a full-stack developer at Blockchain Tech Solutions, shipping Telegram mini-apps and real-time dashboards.

At 18, I founded Cognova AI, an AI-powered customer support platform that enabled businesses to create personalized AI sales agents that handle customer interactions on their social platforms and websites, allowing business owners to focus on growth. It was later acquired by On Mark TT Enterprises Limited.

Today I’m a software engineer at Siebenberge (opens in a new tab), where I’m the product & engineering lead for cowtic (opens in a new tab), a leading Swiss event-ticketing platform. I built it from scratch: the whole stack and an iOS check-in app on the App Store.

In 2025 I also worked part-time at Polar (opens in a new tab), the open-source billing platform for developers, after its CEO reached out to me on X. I supported developers and built internal tools for the team.

Outside work I’m building Instant Cloud (opens in a new tab), a hosting platform for African developers, and OpenTunnel, a self-hostable tunnel for localhost. I’m studying Software Engineering at African Leadership University, and I’m looking for a product team where I can own features end to end, alongside engineers I can learn from.

Selected work

All projects

Experience

Full résumé
  • Siebenberge GmbH (opens in a new tab)Software Engineer
    • Product and engineering lead for cowtic (opens in a new tab), a leading Swiss event-ticketing platform: built it from the first commit.
    • Shipped cowtic’s REST API and TypeScript SDK, Apple and Google Wallet passes, offline-capable check-in, and event cancellation with automated refunds.
    • Led security and reliability work across the platform; merged 74+ pull requests.
    2025 – now
  • Polar (opens in a new tab)Customer Support & Internal Tools Engineer
    • Joined Polar, the open-source billing platform for developers; worked across developer support and internal tooling.
    • Built back-office tools that let Polar’s team manage organizations and streamline account operations (merged into polarsource/polar).
    • Supported developers integrating Polar’s checkout, subscriptions and payments, and shipped fixes across the product.
    2025
  • Blockchain Tech SolutionsSenior Full-Stack Developer

    Built interactive crypto games, mining platforms, and NFT experiences, alongside real-time analytics dashboards.

    2024 – 2025
  • Uruti HubFrontend Developer

    Designed the UI and built core interface components for Uruti projects.

    2023 – 2024
  • FreelanceFull-Stack Developer

    Built and shipped web applications for clients found through Upwork, Discord and X.

    2021 – 2023

Education

Open source

Writing

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