Carlos Ballesteros

Cross-platform software for Windows and macOS that combines file navigation with advanced note-taking, diagrams, kanban boards, and habit tracking.

• Designed, architected, planned, and fully developed the product
• Leveraged AI to speed up development while maintaining manual control in key decisions
• Implemented feature flags and progressive release strategy
• Coordinated external marketing and promotional assets
• Built infrastructure ready for scalability and an iterative roadmap

Outcome: Delivered a viable product in record time → focused on monetization and community-driven growth.

Open-source, cross-platform game engine and associated libraries in Kotlin for desktop, mobile, and TV operating systems. Created and led the project and its community for eight years.

• Designed, developed, and maintained the entire project
• Led the community for 8 years
• Built a full ecosystem of libraries and tooling
• Adopted in commercial products such as InVideo

Outcome: Global recognition, collaborations, and new career opportunities.

Improved team productivity by an order of magnitude through stack, architecture, and delivery-pipeline simplification while mentoring developers and increasing team autonomy.

• Cut compilation times by 50%
• Enabled full IDE debugging → less friction, higher code quality
• Added observability with metrics, events, and performance data
• Significantly simplified architecture and build workflows
• Progressively migrated frontend code from JavaScript to TypeScript
• Mentored developers in Kotlin coroutines and technical documentation

Outcome: More autonomous and faster team → accelerated feature delivery.