Kerolos Samir

Senior Frontend Engineer with 6+ years building high-performance, accessible React and TypeScript applications for enterprise SaaS.

Track record of measurable production impact: 3x page-speed improvements, 80% reduction in API traffic through architectural redesign, and canvas-based tooling adopted by 50+ enterprise clients. Experienced in fully remote, cross-time-zone collaboration with distributed teams.

Senior Software Engineer at ServiceNow (2025-03 – Present)

• Delivered a 3x performance improvement on critical pages by profiling with Chrome DevTools, restructuring data access patterns, and eliminating race conditions and memory leaks.
• Architected a centralized data synchronization layer in TypeScript that batches user changes into a single normalized payload, cutting API call volume by 80%.
• Built a real-time store simulator in React and TypeScript rendering live customer movement and queue status across 3,000+ stores.
• Shipped two production AI features: auto-generated spatial recommendations (40% less manual configuration) and a voice-enabled AI agent that cut onboarding time by 60%.
• Created internal developer tools for error detection and code quality enforcement used daily by 20+ engineers; authored architecture docs and led technical sessions for 15+ engineers.

Software Engineer at ServiceNow (2023-07 – 2025-03)

• Built a canvas-based zone definition tool (HTML5 Canvas + React) enabling 50+ enterprise clients to draw monitoring regions on live camera snapshots, replacing a fully manual process.
• Developed a reusable scheduling component with layered time controls (day, week, month, year), deployed across 100+ retail locations.
• Shipped retail intelligence features in React and TypeScript, including cashier demand forecasting, crowd detection, and shelf monitoring, adopted across 3,000 stores.
• Raised accessibility to WCAG standards across products used in 10+ countries; built maintainable test suites with Jest and React Testing Library.

Senior Frontend Developer at G2K Group (2021-03 – 2023-07)

Remote-first, German company

• Designed the frontend architecture from scratch in React and Redux; the foundation supported 3 major releases without a rewrite.
• Reduced initial load time by 65% through code splitting, dynamic imports, and bundle optimization, profiled with Lighthouse and Chrome DevTools.
• Led a team of 3 developers; ran code reviews and mentored junior engineers on component architecture and testing.
• Redesigned the analytics dashboard into a unified real-time interface, increasing user engagement by 25%.
• Integrated Google Maps API and Firebase for real-time location tracking and authentication serving 5,000+ daily users, with role-based access control.

Frontend Developer at Selah Eltelmez (2020-08 – 2021-03)

• Built an educational platform in React and Redux for 1,000+ students with responsive layouts and interactive data visualizations.
• Cut delivery time by 50% by architecting a reusable component library; built an admin dashboard with optimized high-volume list rendering.

Military Service at Egyptian Armed Forces (2019-06 – 2020-08)

Completed

Frontend Developer at Freelance (Upwork) (2018-09 – 2019-06)

• Delivered 10+ client projects (e-commerce, responsive sites) achieving 30+ point PageSpeed improvements for international clients.

Frontend Development Diploma – Route Academy (2020)

Bachelor of Commerce – Cairo University (2018)