# Marcus Lorenzana > Senior Software Engineer | AWS Cloud | Serverless | AI Integration Location: San Antonio, Texas, United States Profile: https://flows.cv/marcuslorenzana 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. ## Work Experience ### Senior Cloud Software Engineer @ City Electric Supply Jan 2024 – Present | San Antonio, Texas, United States • Architected and contributed to internal DevEx tooling, including a shared CDK construct library, SDK, and a CLI that automates project scaffolding, internationalization, and domain-driven code generation. • Delivered cloud-native solutions with AWS CDK, CloudFormation, and Lambda, ensuring scalability and platform consistency. • Core engineer on AI incubator initiative exploring how AI can enhance development efficiency and identifying its limitations. Delivered features and bug fixes while building infrastructure to support isolated developer stages. • Led spike research for new features, contributing to architectural planning and prototyping. • Reduced AI text generation costs by ~80% in our environments through model migration and optimization. • Built a Bedrock-based app during an internal AI hackathon to auto-generate Bills of Quantities (BoQs) from project descriptions. • Contributed to “AI as a Platform,” developing an internal chatbot and enabling teams to leverage a shared AI framework. • Developed multi-region deployments using CDK and CloudFormation, enhancing deployment efficiency. • Provided support to engineering teams, including guidance, code reviews, and tooling issue resolution. • Automated DNS management with CDK, simplifying Route 53 hosted zone creation across regions. ### Senior Full Stack Engineer @ EControls Jan 2024 – Jan 2024 | San Antonio, Texas, United States • 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 Jan 2022 – Jan 2023 | San Antonio, Texas, United States • 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 CDK stack, 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 Jan 2021 – Jan 2022 | San Antonio, Texas, United States • 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 Jan 2019 – Jan 2021 | San Antonio, Texas Area • 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 Jan 2016 – Jan 2019 | San Antonio, Texas Metropolitan Area • 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 in Computer Science The University of Texas at San Antonio Jan 2010 – Jan 2015 ## Contact & Social - LinkedIn: https://linkedin.com/in/lorenzanamarcus - GitHub: https://github.com/MeesterMarcus --- Source: https://flows.cv/marcuslorenzana JSON Resume: https://flows.cv/marcuslorenzana/resume.json Last updated: 2026-03-22