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

Jan 2018 - Present
Agoura Hills, CA
  • 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

Jan 2014 - Jan 2024
Los Angeles, CA
  • 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

Jun 2016 - Sep 2017
Los Angeles, CA
  • 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

Node.js
Python
Java
C#
.NET Core
PHP
Go
TypeScript
JavaScript

Cloud & Infrastructure

AWS
Azure
GCP
Docker
Kubernetes
Terraform
CloudFormation
Serverless

Databases & Storage

PostgreSQL
MySQL
MongoDB
Redis
DynamoDB
Elasticsearch
MSSQL Server

DevOps & CI/CD

CI/CD
Jenkins
Terraform
Docker
Linux
Windows Server
VMware

AI/ML & Analytics

Machine Learning
DBSCAN
GPT Integration
Behavioral Segmentation
Real-time BI

Architecture & Leadership

Microservices
Event-driven Architecture
System Design
Team Leadership
Mentoring

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!

Connect with me

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