Open to opportunities

jairzinho arreola

@jairzinhoarreola

Message

Senior Backend Engineer building scalable cloud-native systems and RESTful microservices for SaaS products.

United States

Message

What I'm looking for

I’m looking for a backend role where I can design and modernize cloud-native microservices, build REST APIs and event-driven systems, and improve scalability and performance for SaaS products.

I’m a Senior Backend Engineer with 15 years of experience designing and building scalable backend systems and enterprise web applications. I build RESTful APIs, microservices, and cloud-native services using C#, ASP.NET Core, and AWS—often alongside Go, Python, and Node.js—to deliver reliable solutions for SaaS and enterprise platforms.

I’ve strengthened performance and scalability by designing APIs and modern cloud infrastructure, including “Increased scalability by 15%.” I also modernize legacy systems with Docker and Kubernetes, design event-driven architectures with Lambda, API Gateway, DynamoDB, SQS, and SNS, and improve developer productivity through automated tests and internal tooling.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

NextSprintTech

Dec 2025 - Present (7 months)

Built backend services and AI-powered applications for a startup, using C# and ASP.NET Core with SQL Server and AWS. Developed RESTful APIs and microservices, increasing scalability by 15% through API and cloud infrastructure improvements.

C#ASP.NET Core SQL Server AWS RESTful APIs Microservices Cloud Infrastructure Distributed Systems AI Powered Applications Go Python

Senior Software Engineer

Santoli Connected Network

Jul 2022 - Nov 2025 (3 years 4 months)

Built scalable backend services for cloud-based SaaS applications using C#, ASP.NET Core, and AWS. Designed RESTful APIs and event-driven microservices with AWS services, and modernized legacy systems with Docker and Kubernetes.

C#ASP.NET Core AWS RESTful APIs Event Driven Systems AWS Lambda API Gateway DynamoDB SQS SNS Docker Kubernetes Cloud Services Scalability Performance Optimization

Senior Software Engineer

BlueSky Innovations

Jul 2015 - Oct 2018 (3 years 3 months)

Built full-stack business applications using ASP.NET Core, C#, React, Node.js, and Laravel. Optimized SQL queries and improved performance using Redis caching and backend service tuning.

ASP.NET Core C#React Node Laravel SQL Redis Backend Services Performance Optimization

Full Stack Developer Intern

Google

Jul 2013 - Jun 2015 (1 year 11 months)

Contributed to internal applications using C, JavaScript, and Java. Built internal analytics dashboards and created automated tests and developer tools to improve REST API development productivity.

C JavaScript Java BigQuery Google App Engine REST APIs Automated Testing Developer Tools

Senior Software Engineer

IBM Consulting

Jan 2012 - Dec 2013 (1 year 11 months)

Developed enterprise backend applications using C#, ASP.NET Core, Node.js, Python, and Java. Designed and deployed containerized microservices on AWS ECS and Kubernetes, improving reliability through automated deployments and performance optimization.

C#ASP.NET Core Node Python Java AWS ECS Kubernetes Microservices Monitoring Performance Optimization

Web Developer

California Systems Group

Mar 2008 - Jun 2012 (4 years 3 months)

Developed internal business applications using C#, ASP.NET, SQL Server, JavaScript, and MySQL. Designed REST APIs, automated internal workflows with Python and PowerShell, and supported deployment and continuous improvement of enterprise systems.