Hi, I'm Roi Ezra
Principal Engineer & Cloud Architect
Driving high-scale cloud systems, applied ML features, and cost-efficient architectures while building strong teams
About Me
I lead engineering teams and build systems that scale, from high volume applications and real time engagement platforms to AI driven automation and data pipelines. I've modernized legacy stacks, shipped critical infrastructure, and led technical transitions that directly enabled business growth.
My background blends deep technical execution with product strategy. I focus on shipping fast, keeping systems stable, and aligning engineering with what actually moves the business forward - whether it's automation, AI-assisted workflows, or scalable backend architecture.
Cloud Architecture
Expert in AWS services, microservices, and serverless architectures with proven cost optimization
AI/ML Integration
Applied machine learning for fraud detection, personalization, and behavioral segmentation
Engineering Leadership
Lead engineers & QA directly, mentor 20+ developers across organization
Cost Optimization
Cut AWS spend 75% ($120k -> $30k/mo) via autoscaling, serverless refactors, and right-sizing
Experience
My professional journey and key accomplishments
Principal Engineer / Engineering Manager
Rooftop Digital
- Lead engineers & QA, oversee $100k/mo cloud budget - scaled product revenue 6× while cutting infra spend 75%
- Decomposed PHP/C# monolith into 20+ microservices (Python, Node, Go, C#) on AWS EKS, Lambda, EventBridge
- Launched personalized content-mailing platform sending 10-20M emails/day, boosting CTR <1% -> ~5%
- Built DBSCAN-based fraud-detection model cutting reward-card abuse 70%, saving $30k+/mo
- Implemented IaC + CI/CD (Terraform, SAM, GitHub Actions) - release cadence 4× faster, auto-rollback in 3 min
- Delivered GPT-based job-matching pipeline improving search relevance 35%
- Mentored 20+ engineers via weekly architecture reviews, driving multiple internal promotions
- Promoted 4× in tenure (Dev -> Eng Lead) while growing team 2 -> 12
Founder & Technical Director
NY Designs
- Founded and scaled boutique agency delivering e-commerce & CMS solutions; grew to 6 contractors
- Retained clients averaging $10k+/mo recurring revenue
- Engineered SEO-optimized platforms lifting medical-spa client from zero -> 200-400 organic visits/day
- Architected, hosted, and secured 50+ high-traffic e-commerce sites with 99.9% uptime
- Delivered PCI-compliant transaction processing across WooCommerce, Magento, Shopify platforms
System Administrator
Green Home Services
- Implemented predictive dialer (Asterisk) handling 200-300 calls/agent/day across 40+ agents
- Generated ~1 qualified lead/agent/day driving $1M/mo revenue
- Integrated dialer with custom CRM for sub-second disposition capture & lead routing
- Administered hybrid Windows/Linux environment (VMware, MySQL cluster)
- Automated patching/backups reducing downtime incidents by 60%
Skills & Technologies
My expertise and technical proficiencies across the full technology stack
Languages & Frameworks
Cloud & Infrastructure
Databases & Storage
DevOps & CI/CD
AI/ML & Analytics
Architecture & Leadership
Education
My academic background and qualifications
Bachelor's Degree: Business Management
California State University, Northridge (2012 - 2014)
Completed a comprehensive business management program with Dean's List recognition. Active involvement in Alpha Epsilon Pi fraternity. The business foundation has been instrumental in understanding the intersection of technology and business strategy throughout my engineering career.
Get In Touch
Have a project in mind or want to discuss opportunities? I'd love to hear from you!