Blockchain Loyalty Platform

Backend engineer at qiibee (Zurich, Switzerland), building scalable loyalty infrastructure on blockchain.

Key contributions:

• Developed critical APIs for the loyalty miles system in Phoenix, enabling high-value transactions for multiple brand partners
• Maintained blockchain infrastructure including transaction signing dApp and indexer
• Built a sales automation tool that increased team efficiency by 3x using Elixir and JavaScript
• Led cross-team technical integrations for third-party and client implementations
• Reduced deployment time by 50% and improved data retrieval performance by 1400% within Lambda constraints
• Built distributed publisher-consumer architectures with GenStage and Broadway for background jobs

My role: Backend engineer (Aug 2021 - Oct 2024), working across Elixir/Phoenix, Node.js/Express, and AWS serverless architectures.