Open to opportunities

Einar Montalvo

@einarmontalvo

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Senior Full stack Engineer with 10 years of experience

United States

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What I'm looking for

Looking for a challenging role that utilizes my skills and experience to deliver high-quality solutions that meet and exceed customer expectations.

As a seasoned full-stack Engineer, I bring 10 years of robust experience in both web and mobile development. My expertise spans strong front-end, UX/UI design skills, robust back-end knowledge, cloud services, and system design, enabling me to deliver comprehensive and scalable solutions in AI start-ups, E-commerce, Healthcare, iGaming, and real-estate industries.

I have a strong background in developing and maintaining high-performance APIs, web applications, and mobile applications using various technologies such as React, Node.js, TypeScript, HTML5, CSS3, and JavaScript. I am proficient in cloud services including Azure, AWS, and GCP, and have experience with DevOps tools like Docker, Kubernetes, and Ansible.

I am a results-driven professional passionate about delivering high-quality solutions that meet and exceed customer expectations. I am a team player with excellent communication skills and a strong understanding of Agile methodologies.

Experience

Work history, roles, and key accomplishments

Senior Full Stack Engineer

Yellow Systems

Oct 2023 - Jul 2025 (1 year 9 months)

• Architected distributed LLM orchestration platform using Python (FastAPI) microservices and React 19/Next.js 15 frontend, enabling intelligent model routing that reduced API costs by 40% while serving 500M+ daily requests

TypeScript Next.js Lazy Loading Storybook Playwright Cucumber D3.Js Figma PowerShell WebSockets .NET Microsoft Azure Azure Cosmos Azure DevOps Azure Kubernetes Service

Senior Frontend Developer

FoxyAI

Sep 2022 - Oct 2023 (1 year 1 month)

• Developed AI-powered property analysis SPA using React 18 with concurrent features, lazy loading, and code splitting reducing initial bundle from 2MB to 400KB while maintaining rich functionality
• Integrated Zillow API with custom ML models to create automated property assessment tool processing 10K+ properties daily with 95% accuracy

React Node Backbone.Js Ruby on Rails Figma Adobe Storybook Varnish CDN Jest React Testing Cucumber Playwright Sentry Ansible Live Video HLS Go MySQL CMS

Software Developer

Sportserve

Feb 2017 - Sep 2022 (5 years 7 months)

• Led frontend architecture migration to Next.js 13 with ISR, implementing atomic design methodology and reducing Time to Interactive from 8s to 1.2s for millions of concurrent users
• Built real-time betting interface using React 18, RxJS for complex event streams, and custom WebSocket hooks managing 500K+ odds updates/minute with automatic reconnection and buffering