Rosen Petkov

Staff Software Engineer

Lace | 07/2025 – Present

Selected impact

• Owned end-to-end delivery of an after-hours technician orchestration platform spanning Temporal workflows, Twilio SMS, field-service synchronization, escalation APIs, React, monitoring, and deployment.
• Delivered a customer platform for configuring, staging, and publishing AI voice agents, including prompts, knowledge, fees, transfers, call handling, and Retell deployment feedback.
• Built reusable multi-agent voice automation with LLMs and Retell, including staged prompts, tool schemas, dynamic transfers, IVR/DTMF routing, scheduling, and automated conversation tests.

Python, Rust, React, TypeScript, Temporal, MySQL, Docker, Playwright, Prometheus

Staff Engineer

Halo Precision Diagnostics | 05/2020 – 07/2025

• Led the design and delivery of a shared design system used across four Angular applications.
• Owned frontend architecture and project structure within a large Nx monorepo.
• Kept Angular current through major upgrades and evolved state management and engineering standards.
• Improved logging, observability, PWA capabilities, rendering strategies, and frontend performance.

Angular, TypeScript, Akita, Java, Spring, PostgreSQL, Kubernetes, Docker

Senior Developer

Westernacher Solutions | 03/2018 – 05/2020

• Delivered three Angular and Java applications for the German Federal Chamber of Notaries within an international product team.

Angular, TypeScript, NgRx, Java, Spring, JPA, Oracle

Senior Developer

InterConsult Bulgaria | 05/2012 – 03/2018

• Built maritime monitoring and systems-integration products while contributing to requirements, architecture, and customer delivery.

.NET, WPF, Web API, Azure, AngularJS, SQL Server