Marcus Lorenzana
San Antonio,TX
Summary
Senior Software Engineer with experience building both user-facing products and internal platforms, with a strong focus on cloud-native and serverless systems. I design and maintain scalable, secure applications on AWS, working across backend, infrastructure, and experience layers to deliver reliable, intuitive solutions for end users. My work spans product features, platform foundations, and developer experience. I have built and integrated AI-driven capabilities into applications, contributed to internal AI platforms, and improved access patterns, automation, and tooling that help teams ship faster without sacrificing quality or security. I work closely with product, QA, and non-technical stakeholders, translating complex technical problems into clear, practical outcomes. BS in Computer Science, with a mindset focused on continuous improvement and building systems that hold up in real-world use.
Overview
10
10
years of professional experience
Work History
Senior Cloud Software Engineer
City Electric Supply
09.2024 - Current
- Architected and contributed to internal DevEx tooling including a shared CDK construct library, SDK, and CLI for automated project scaffolding, internationalization, and domain-driven code generation.
- Delivered cloud-native solutions using AWS CDK, CloudFormation, and Lambda, improving scalability and platform consistency.
- Leading development of a new warehouse management application to replace a costly proprietary system and improve operational efficiency.
- Participating in a highly visible initiative leveraging AI tooling to analyze engineering productivity and development patterns.
- Conducted spike research and prototyping to inform architectural direction for new platform capabilities.
- Reduced AI text generation costs by ~80% through model migration and optimization.
- Built a Bedrock-based prototype that generates Bills of Quantities (BoQs) from project descriptions.
- Contributed to the “AI as a Platform” effort by helping deliver an internal chatbot and shared AI framework for other teams.
- Implemented multi-region deployments using CDK and CloudFormation.
- Provided technical guidance, code reviews, and tooling support across engineering teams.
- Automated DNS management with CDK, simplifying Route 53 hosted zone creation across regions.
Senior Full Stack Engineer
EControls
02.2022 - 09.2024
- Led the design and implementation of architecture patterns to enhance code modularity and separation of concerns, significantly improving system maintainability.
- Led Lunch & Learn talks to introduce new technologies and best practices which I later implemented to great results.
- Achieved a 45% reduction in production database costs through detailed Azure scaling analysis, aligning with our operational needs and budget constraints.
- Helped achieve a 79% performance improvement in our UI build times by leveraging new tooling.
- Developed serverless functions to automate warranty estimation for customers, removing the need for manual calculations and enhancing the user experience.
- Constructed a stress testing framework using K6 for our main backend API, increasing system reliability by identifying and mitigating potential performance bottlenecks.
Software Engineer II
Extend
07.2022 - 12.2023
- Played a vital role in both backend and frontend development at Extend, contributing to the creation of key features using TypeScript, NodeJS, and ReactJS.
- Optimized service build times by 25% through strategic upgrades to our CDKstack, enhancing efficiency and performance.
- Spearheaded the migration of our service to a polyrepo architecture, achieving better scalability and maintainability.
- Contributed to the core offers team, managing over 18 million daily requests with a consistent < 250 ms response time.
Software Engineer
Terazo
05.2021 - 07.2022
- Implemented sprint demos, developed new features, resolved challenges, and consistently received excellent client feedback.
- Specialized in crafting backend, frontend, and mobile app features, including the integration of the Twilio platform with client applications.
- Led the implementation of React Native code and contributed significantly to the backend NodeJS codebase.
- Assumed leadership roles, including covering for the tech lead and performing those duties for several months.
Senior Software Engineer
Fiserv
09.2019 - 05.2021
- Developed within a full technology stack, utilizing Java, Spring, and Angular in a microservice environment.
- Led a frontend platform migration from AngularJS to Angular 2+, collaborating with business and project managers to identify technical debt, allocate migration efforts, and advocate for the upgrade.
- Conducted developer talks on efficient Git usage and advanced techniques, guiding team members towards best practices.
- Mentored new developers and significantly enhanced documentation to streamline the onboarding process.
Software Engineer II
H-E-B
01.2016 - 09.2019
- Built and scaled enterprise applications in Java, Spring Boot, Angular, and Oracle SQL, while also acting as an organization-wide Angular mentor, leading adoption talks and demos.
- Contributed significantly to a competitive edge for H-E-B by developing pricing analytics for produce and pharmaceuticals and assisting in the integration of a customer service chatbot on Facebook.
- Participated in a 2017 Hackathon focused on enhancing software capabilities within the Information Systems department and mentored new software engineers, promoting organizational best practices and methodologies.
Education
Bachelor of Science - Computer Science
The University of Texas At San Antonio
San Antonio, TX01.2015
Skills
- AWS
- AWS CDK
- AWS Lambda
- Serverless Architecture
- Microservices Architecture
- API Gateway
- DynamoDB
- Infrastructure as Code
- AWS CloudFormation
- Nodejs
- TypeScript
- React
- CI/CD
- Distributed Systems
- Amazon Bedrock / AI Integration
Websites
Awards
- Honor Roll, 2011-03-01
- Dean's List, 2012-09-01
- Honor Roll, 2011-09-01
Timeline
Senior Cloud Software Engineer
City Electric Supply
09.2024 - Current
Software Engineer II
Extend
07.2022 - 12.2023
Senior Full Stack Engineer
EControls
02.2022 - 09.2024
Software Engineer
Terazo
05.2021 - 07.2022
Senior Software Engineer
Fiserv
09.2019 - 05.2021
Software Engineer II
H-E-B
01.2016 - 09.2019
Bachelor of Science - Computer Science
The University of Texas At San Antonio