Jairzinho Guido Arreola
js, Java, and React. I own features end-to-end—from clarifying requirements and architecture to shipping clean, testable code and automating deployments to AWS/Azure with modern CI/CD practices.
About
I’m Jairzinho Guido Arreola, a senior software engineer based in San Jose, with 15+ years of building and scaling web applications and backend services using Python, Node.js, Java, and React. I own features end-to-end—from clarifying requirements and architecture to shipping clean, testable code and automating deployments to AWS/Azure with modern CI/CD practices.
I’ve led e-commerce and fintech initiatives, designed microservices and APIs, built responsive UIs, implemented secure RBAC and OAuth2 flows, and mentored engineers while collaborating with product, risk, and compliance teams. I’m passionate about pragmatic problem solving, clear communication, and delivering high-availability platforms that handle real-world traffic and sensitive data.
- 16 years' experience
- Joined January 2026
Industry experience
- Software & Internet
- Professional Services
- Computers & Electronics
- Other
- Healthcare
- Financial Services
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Work experience· 5 roles
Led engineering teams building cloud-native applications using TypeScript, React, Next.js, Node.js, Go, and Python. Designed microservices on AWS Lambda, API Gateway, DynamoDB, SQS/SNS. Drove modernization to Docker + Kubernetes, improving deployment reliability. Delivered features for high-traffic platforms serving millions of users.
Built backend systems using Node.js, Python, Java, and .NET Core. Deployed microservices with Docker, Kubernetes, AWS ECS/EKS. Improved uptime through observability tools (Prometheus, Grafana, CloudWatch). Mentored junior developers and performed architecture reviews.
Developed full-stack applications using Node.js, PHP (Laravel), React, Angular, and TypeScript. Implemented AWS solutions (EC2, S3, Lambda, RDS, DynamoDB). Increased performance by 30% using Redis caching and query optimizations. Migrated legacy PHP systems into modern Node.js microservices.
Education· 18
Certifications and awards
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