Andrei is available for hire
Hire AndreiAndrei Mosso Mendoza
Verified Expert in Engineering
Full-stack Software Engineer and Developer
San Antonio, TX, United States
Toptal member since May 24, 2014
Bio
Andrei is a senior full-stack software engineer and architect with experience developing Java and Node.js applications. He has worked in all phases of the project lifecycle, using a wide variety of tools and frameworks. Andrei has a strong drive to efficiently deliver effective software solutions.
Portfolio
USLS - Main
Java, Spring Boot, Angular, Apache Struts, Apache Tomcat, Spring MVC, MariaDB...
iHeartMedia
Java, Angular, Kubernetes, GitOps, MySQL, Docker, CI/CD Pipelines...
Charter Communications
Java, Angular, Spring Boot, MySQL, React, REST APIs, Microservices, Full-stack...
Experience
- Java - 15 years
- Angular - 6 years
- Software Architecture - 6 years
- Spring MVC - 5 years
- CI/CD Pipelines - 5 years
- MongoDB - 4 years
- Hibernate - 3 years
- Node.js - 1 year
Work Experience
Senior Full-stack Dev/Architect for a record retrieval system
2025 - 2026
USLS - Main
- Implemented a multitude of new features and bug fixes.
- Provided production support with timely code and data fixes.
- Increased productivity by 50% using AI coding workflows.
Technologies: Java, Spring Boot, Angular, Apache Struts, Apache Tomcat, Spring MVC, MariaDB, Red Hat Linux, Amazon Web Services (AWS), APIs, Back-end, Microservices Architecture, Claude, AI Tools, Claude Code, Spring, Legacy Code, Database Design
Senior Software Engineer
2022 - 2025
iHeartMedia
- Designed and developed multiple micro-service API projects that enable the creation and delivery of audio ad campaigns, serving over 2 billion ads per month.
- Increased personal productivity by 50%, leveraging AI to do development work.
- Designed, wrote, and executed performance tests to make sure the architecture scaled to the required throughput.
- Led migration efforts to a new DevOps platform. Our team was the first to use the new platform based on GitOps. Worked closely with the DevOps team on adoption, providing feedback and debugging issues.
- Wrote GitHub Action workflows to integrate into the CI/CD pipeline. Deployments to K8s with ArgoCD.
Technologies: Java, Angular, Kubernetes, GitOps, MySQL, Docker, CI/CD Pipelines, Amazon DynamoDB, Spring Boot, Amazon RDS, Amazon Web Services (AWS), REST APIs, GraphQL API, Microservices, Distributed Systems, Large-scale Distributed Systems, Relational Databases, Artificial Intelligence (AI), Full-stack, Front-end Development, Full-stack Development, Back-end Development, Software Development Lifecycle (SDLC), APIs, Back-end, Microservices Architecture, Claude, AI Tools, Claude Code, Spring, Database Design, Enterprise Application Development
Full-stack Software Developer IV
2020 - 2022
Charter Communications
- Designed and implemented microservices architecture and initial codebase of Spectrum's email web application (5+ million users).
- Provided guidance to newer team members on how to set up their development environments and coached people on Angular development.
- Automated end-to-end tests using Cucumber, which allowed us to catch some new bugs before they got to QA.
- Deployed and managed microservices applications using Kubernetes in an AWS environment.
Technologies: Java, Angular, Spring Boot, MySQL, React, REST APIs, Microservices, Full-stack, Front-end Development, Full-stack Development, Back-end Development, Software Development Lifecycle (SDLC), APIs, Back-end, Microservices Architecture, Spring, Database Design, Enterprise Application Development
Full-stack Software Engineer III
2019 - 2019
Comcast
- Enabled self-service access for business users to use the terabytes of data the company constantly generates.
- Created integrations between different teams’ work using REST APIs.
- Wrote and tuned Elasticsearch queries, and ingested data into Elasticsearch.
- Wrote an unofficial Java API to integrate FreeIPA (directory service) in order to query users' permissions on the Comcast infrastructure.
- Implemented a chatbot using Amazon Alexa's API to access the team's API documentation.
Technologies: MongoDB, Jenkins, Angular, Spring Boot, Microservices, REST APIs, Full-stack, Front-end Development, Full-stack Development, Back-end Development, Software Development Lifecycle (SDLC), APIs, Back-end, Microservices Architecture, Spring, Database Design, Enterprise Application Development
Software Engineer
2018 - 2019
Charter Communications
- Enabled self-service access for business users to use the terabytes of data the company constantly generates.
- Implemented an end-to-end CI/CD pipeline with automatic and zero-downtime deployments.
- Designed and developed a monitoring tool to keep track of the Remedy infrastructure's health.
- Wrote performance tests in JMeter and tuned Java application to meet new (3x) load requirements.
- Designed and developed an ad-hoc tool to flush 48+ Remedy servers' cache from a single screen, reducing downtime by 1 hour during production releases.
Technologies: MongoDB, GitLab CI/CD, Angular, Spring, Java, Spring Boot, Amazon EC2, Microservices, REST APIs, Full-stack, Front-end Development, Full-stack Development, Back-end Development, Software Development Lifecycle (SDLC), APIs, Back-end, Enterprise Application Development
Senior Software Engineer
2017 - 2018
Quadwrange (via Toptal)
- Implemented bug fixes and new requirements using Play framework and AngularJS.
- Fixed bugs in Ionic apps.
- Used the Scrum methodology.
- Created a WYSIWYG editor to customize various pages.
Technologies: MongoDB, Full-stack, Front-end Development, Full-stack Development, Back-end Development, Software Development Lifecycle (SDLC), APIs, Back-end
Software Engineer (via Toptal)
2015 - 2017
Prolific Interactive
- Implemented bug fixes and new requirements using Laravel.
- Integrated Amazon S3 API to store image and video content.
- Integrated Amazon Elastic Transcoder to process videos uploaded by users.
- Automated most of the unit tests and integrated them into the CI/CD pipeline.
- Integrated testing into the continuous integration system.
Technologies: Amazon Elastic Transcoder, Amazon S3 (AWS S3), MongoDB, Laravel, AWS Lambda, REST APIs, Full-stack, Full-stack Development, Back-end Development, APIs, Back-end
Senior Software Engineer
2015 - 2016
uDown (via Toptal)
- Designed and implemented back-end REST services using Node.js and Feathers.js.
- Designed and implemented a mobile app using the Ionic framework. Used a high-performance JavaScript animation library to provide a good user experience.
- Integrated with Facebook API.
- Integrated with Twitter API.
- Worked under the Scrum methodology.
Technologies: MongoDB, FeathersJS, Node.js, Full-stack Development, Back-end Development, APIs, Back-end
Senior Software Engineer
2015 - 2015
Smyle, Inc. (via Toptal)
- Designed and implemented high-performance back-end REST services.
- Developed using Spring MVC, Redis, and Hibernate.
- Developed for iOS using Swift 2.
- Integrated with Facebook and Dropbox APIs.
- Maintained project control with Jira and GitHub.
Technologies: Hibernate, Spring MVC, Redis, iOS, Swift, Java, Full-stack Development, Back-end Development, APIs, Back-end
Software Engineer
2013 - 2015
Systems USA
- Implemented new HHSC dispositions with Java EE, Hibernate, and in-house frameworks.
- Supported the HHSC's welfare production portal.
- Created batch jobs to process client requests for support using Java and Hibernate.
- Migrated a legacy system to a web-based application using IBM Portal and AngularJS.
Technologies: jQuery, Hibernate, Spring, Java EE (Jakarta EE), Back-end Development, APIs, Back-end, Legacy Code
Software Architect
2013 - 2013
Noiselab Apps
- Implemented the user interface using Xcode.
- Invoked back-end services to populate the screens with data.
- Implemented user interaction flow with storyboards.
- Implemented back-end REST services using Spring-MVC and Hibernate.
- Programmed for mobile devices.
Technologies: Hibernate, Spring MVC, iOS, Back-end Development, APIs, Back-end
Lead Specialist
2012 - 2012
Grupo ASSA
- Installed Dev and QA environments using WebLogic, Oracle SOA Suite, Service Bus, Enterprise Repository, Service Registry, and a load balancer.
- Created detailed instructions allowing the infrastructure team to install the production environment.
- Developed web services to expose JD Edwards business functions.
- Integrated services with Salesforce.com.
- Created an interface to periodically transfer data from JD Edwards to a legacy system using Oracle Data Loader.
Technologies: Oracle Data Integrator (ODI), Oracle, Apache Maven, Java EE (Jakarta EE), Back-end Development, APIs, Back-end
Software Architect
2008 - 2011
Glider Software Solutions
- Created a checks and savings account opening system for IXE bank, using Java EE and Oracle BPM.
- Created a checks, savings, and credit card accounts opening system for Banamex - Citi bank, using Java EE and Oracle BPM.
- Migrated an Aqualogic BPM 5.7 project to Oracle BPM 10.3.
- Designed and implemented a budget proposal and approval system, using Aqualogic BPM 6.0 and Flex Builder 3.
- Assessed best practices for Aqualogic BPM implementations.
- Installed development, QA, and production WebLogic, including Aqualogic BPM and Oracle BPM environments.
- Provided on-site support for WebLogic, Aqualogic BPM, and Oracle BPM environments.
Technologies: Oracle WebLogic Portal, Subversion (SVN), Apache Maven, Ant Design, jQuery, JavaScript, Hibernate, Spring MVC, Java EE (Jakarta EE), Back-end Development, APIs, Back-end
Software Engineer
2007 - 2008
Softtek
- Received a non-functional system and took it to production in six months.
- Implemented new functionality using Java, JSP, and JavaScript.
Technologies: Subversion (SVN), MQL, JavaScript, Java EE (Jakarta EE), Back-end Development, APIs, Back-end, Legacy Code
Project History
Ad Builder
Ad Builder is an AI-enabled tool that automates most of the effort to generate and publish audio ad campaigns. Using an AI engine, Ad Builder generates the ad script. Then, it synthesizes the script and mixes the audio with background music to deliver a fully produced ad that is ready to air in podcasts or music streaming services.
Education
2002 - 2006
Bachelor of Science Degree in Computer Science
Tecnologico de Monterrey - Cuernavaca, Mexico
Skills
Libraries/APIs
REST APIs, Node.js, Dropbox API, Facebook API, jQuery, React, Google Drive API, GraphQL API
Tools
Apache Maven, Git, Subversion (SVN), Claude, Claude Code, GitLab, GitLab CI/CD, Jenkins, Jira, Apache Tomcat
Languages
JavaScript, Java, SQL, HTML, MQL, Swift, CSS
Frameworks
Spring, Spring MVC, Angular, Spring Boot, Spring Security, FeathersJS, JUnit, Hibernate, Angular Material, Ant Design, Laravel, Apache Struts
Paradigms
REST, Microservices, Microservices Architecture, Scrum, Database Design
Platforms
Docker, Oracle, iOS, Amazon Web Services (AWS), Java EE (Jakarta EE), Oracle Data Integrator (ODI), Kubernetes, Amazon EC2, AWS Lambda, Red Hat Linux
Storage
Redis, MongoDB, MySQL, Amazon DynamoDB, Relational Databases, Amazon S3 (AWS S3), PostgreSQL, MariaDB
Other
Software Architecture, Front-end, Software Development, Front-end Development, Full-stack Development, Code Review, Solution Architecture, Design Systems, System Design, Full-stack, Back-end Development, Software Development Lifecycle (SDLC), APIs, Back-end, Enterprise Application Development, Amazon Elastic Transcoder, CI/CD Pipelines, Project Scoping, Team Mentoring, Distributed Systems, Large-scale Distributed Systems, Artificial Intelligence (AI), AI Tools, Legacy Code, Oracle WebLogic Portal, GitOps, Amazon RDS
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