Caleb Yohannes
Software engineer with close to 5 years of experience building production systems across commerce, fintech, and healthcare AI. built an extraction pipeline that achieved 99% reliability across all EHR systems for our customers.
work
view allNovoflow (YC X25)
Founding Engineer
Oct 2025 — Present
Building AI employees for Healthcare.
HelpUsDefend
Full Stack Engineer
May 2025 — Sep 2025
Built and maintained 65square, a social networking application focused on security and privacy. Improved test coverage by 30% and reduced issue resolution time by 25% via automated CI/CD pipelines.
Shopify
Fullstack/Mobile Developer
May 2024 — Apr 2025
Enhanced checkout flow in the mobile app, reducing cart abandonment by 57%. Engineered merchant-facing APIs and SDKs and worked on Shopify's AI assistant (Sidekick).
IBM
Software Intern → Software Engineer
Jun 2021 — Apr 2024
Built and optimized REST APIs consumed by 30+ internal services. Contributed to cloud migration initiatives, containerizing legacy applications.
blog
view allprojects
view allLLM Observability Monitoring System
Real-time monitoring system for LLM agent events using a microservices architecture with two TypeScript services. Integrated with Groq API and engineered rolling window aggregation pipelines for latency tracking, error rates, and confidence scoring.
MeetingDigest
AI-powered meeting transcription and summarization service. RESTful API with Flask, OpenAI Whisper and GPT-3.5, JWT auth, Google OAuth, and PostgreSQL.
AI Document Analyzer
Full-stack app for uploading, analyzing, and extracting content from PDFs and YouTube videos using AI chat with text and voice modes.
Flopp
Ottawa's first social network for discovering local spots, sharing experiences, and connecting with residents.
Spending Tracker
AI-powered mobile spending tracker that makes personal finance fun, social, and habit-forming. Inspired by oops.app and Duolingo.