Software engineering and technical consulting focused on reliability, performance, and evolving production systems under real-world constraints.
99Codes is the independent consultancy of Leonardo Poletto, a senior software engineer with 10+ years of experience building and maintaining production systems across education, media, marketplaces, and high-traffic platforms.
- Backend systems & APIs that must remain stable under real-world constraints
- Platform and frontend engineering where performance, correctness, and maintainability matter
- Legacy systems that need to evolve without breaking production
- Short- to mid-term consulting engagements requiring ownership, clarity, and delivery
- Advanced search and data integration using Elasticsearch and BigQuery
- Offline-first web platforms for low-connectivity environments (PWA, Service Workers, legacy constraints)
- Large-scale media pipelines (video ingestion, TTS, async processing, notifications)
- High-traffic WordPress and Laravel systems with strict performance and availability requirements
- Experimentation, feature rollouts, and data feedback loops
Most work here reflects client production systems and cannot be open-sourced.
Public repositories are selectively published when appropriate.
Active contributor to web standards and performance tooling, including merged contributions to Google Lighthouse.
Author of small, focused tools around crawling, privacy, and web diagnostics.
Open to full-time roles and selected consulting engagements.
- Website: https://99codes.pro
- LinkedIn: https://www.linkedin.com/in/leopoletto
- GitHub (personal): https://github.com/leopoletto
