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Néstor Rubén Marsollier

Contact Information

Personal Information

  • Languages: Spanish (native), English (advanced)
  • Birth Date: 10-15-1976

Education

  • Degree: B.S. Computer Systems Engineering
  • Institution: UTN Universidad Tecnológica Nacional, Mendoza, Argentina

Professional Summary

Experienced Android and Backend developer with a strong background in teaching and creating tutorials. Skilled in various programming languages and frameworks, with a focus on Android development since 2011 and Kotlin since 2012.

Skills

Android Native Developer

  • Experience: Since 2011
  • Technologies: Android SDK, Kotlin, Jetpack Compose, Espresso, JUnit4, SonarQube, Jacoco, Apollo (GraphQL), MVI architecture, Coroutines with flows, Dagger/Hilt, Navigation framework, DataDog, Jira, Figma, Confluence, Slack
  • Key Skills: Kotlin, Koin, Google Services, GraphQL, REST, Retrofit, Room Database/SQLite, JUnit, Espresso, Jacoco, Hilt, Dagger, Reactive Paradigm, MVVM, MVC, MVI
  • Roles: Technical Leader for Mobile at MercadoPago, Eventbrite
  • Architect: MercadoPago
  • Methodologies: Agile, Scrum, Jira, Figma, Confluence, Slack, Jenkins
  • Companies: Dept, PayPal, MercadoPago, Mercadolibre, Eventbrite, Athos
  • Code Samples: GitHub - Fit Fat

Backend Developer

  • Experience: Senior backend developer with expertise in monolith, SOA, and microservices architectures, including DDD when supported by the language.
  • Technologies: GoLang, Java, Kotlin, Typescript, Javascript
  • Frameworks: JSP, EJB 2 and 3, Spring stack, REST applications
  • Databases: SQL (MySQL, PostgreSQL, Oracle), NoSQL (MongoDB), Key-Value (Redis)
  • Key Skills: High-performance monolith applications, direct access, various ORMs
  • Code Samples:

Teacher

Professional Experience

Dept Argentina

Principal II React Native Developer
Duration: 04/2024 - Present
Project: JOAN

  • Acted as software developer.
  • Working on software refactoring in React Native with Expo Go.
  • Utilized tools like Zustand for state management, React Query for data fetching, and various form libraries.
  • Methodologies: Agile.
  • Architecture: Component-based architecture.
  • Languages: JavaScript, TypeScript.
  • Libraries: Zustand, React Query.
  • Tools: Expo Go.

Principal II Android Developer
Duration: 08/2023 - 04/2024
Project: Prismacolor+

  • Led the development of Prismacolor+, a customer acquisition project.
  • Oversaw the architecture and development of the Android platform.
  • Coordinated with cross-functional teams to ensure seamless integration and delivery of features.
  • Applied best practices for code quality, testing, and deployment.
  • Mentored junior developers and provided guidance on architectural decisions.
  • Methodologies: Agile.
  • Architecture: Eventual MVI.
  • Languages: Kotlin.
  • Libraries: Android SDK, Retrofit, Jetpack Compose, Koin.
  • Design Patterns: MVI, Dependency Injection.
  • Tools: Figma, Slack, Azure.

PayPal

Sr Android Developer
Duration: 09/2021 - 08/2023
Project: Mastercard Credit Card Benefits

  • Built the Android UI for Mastercard Benefits.
  • Created engagement screens, account summary, transaction details, and payment schedules.
  • Implemented event-driven architecture using MVI, Coroutines with flows, and Dagger/Hilt for dependency injection.
  • Collaborated with cross-functional teams to ensure seamless integration and delivery of features.
  • Conducted code reviews and applied best practices for code quality and testing.
  • Methodologies: Agile.
  • Architecture: Event-driven, Model-View-Intent (MVI).
  • Languages: Kotlin.
  • Libraries: Android SDK, Espresso, JUnit4, SonarQube, Jacoco, Apollo (GraphQL), Navigation framework, Dagger/Hilt.
  • Design Patterns: MVI, Dependency Injection.
  • Tools: DataDog, Jira, Figma, Confluence, Slack.

Mercado Pago

Technical Leader
Duration: 05/2020 - 09/2021

Backend

Project: Money In - Money Out

  • Designed and developed money in flows (ask for money, get paid, request income).
  • Created money out flows (send money, organize contacts, pay).
  • Led technical solutions and implemented core functionalities.
  • Programmed 2 microservices to enhance system performance.
  • Methodologies: Agile.
  • Architecture: Microservices, 3 layers of abstraction, MVC.
  • Languages: JavaScript, TypeScript, GoLang.
  • Libraries: Amazon AWS, MySQL, Object Storage, KWS, Apache Kafka.
  • Design Patterns: Creational, Adapters, Strategy, Chain of Responsibility.
  • Tools: Amazon AWS, Apache Kafka, MySQL.

Android

Project: Money In - Money Out

  • Oversaw the architecture and development of the project.
  • Designed and developed money in flows (ask for money, get paid, request income).
  • Managed a team of 6 junior developers, coordinating the development of 4 modules and 3 libraries.
  • Created money out flows (send money, organize contacts, pay).
  • Led technical solutions and implemented core functionalities.
  • Coached developers on technologies and architectures, ensuring adherence to best practices.
  • Methodologies: Agile, Waterfall.
  • Architecture: Event-driven, MVC, MVVM.
  • Languages: Kotlin.
  • Libraries: AndroidX Test, Espresso, Jetpack, OkHttp, Retrofit, ktx extensions, LiveData, Picasso, MockWebServer, PlayServices, Firebase, Gson, Google Maps.
  • Design Patterns: Creational, Observers, State, Strategy, Command, Adapter, IoC.
  • Tools: Jira, Bugsnag, Google Suite, Zeplin, CircleCI, GitHub, DataDog, Trello, Slack, Kafka.

Eventbrite

Senior Software Engineer II
Duration: 07/2016 - 05/2020
Project: Organizer App

  • Responsible for all architectural and development decisions.
  • Refactored the application twice to improve performance, maintainability, and scalability.
  • Designed and implemented a fragment-based navigation system using MVC and MVVM architectures.
  • Developed features using Java and Kotlin, ensuring high code quality and adherence to best practices.
  • Applied event-driven architecture using MVVM, MVC, Repository, DAO (API), and various design patterns including Creational, Observers, State, Strategy, Command, Adapter, and IoC.
  • Employed integrations like Jira, Bugsnag, Google Suite, Zeplin, GitHub, Slack, and Jenkins for project management and collaboration.
  • Followed Agile and Waterfall methodologies to ensure timely delivery and high-quality software.
  • Architecture: Fragment-based navigation, MVC, MVVM, Espresso, Robolectric.
  • Languages: Java, Kotlin.
  • Libraries: Jetpack, OkHttp, Retrofit, LiveData, Picasso, PlayServices, Firebase, Gson, AndroidX, PayPal Here, JUnit, Room, OrmLite, Analytics, Facebook Login.
  • Design Patterns: Event-driven, MVVM, MVC, Repository, DAO (API), Creational, Observers, State, Strategy, Command, Adapter, IoC.
  • Tools: Jira, Bugsnag, Google Suite, Zeplin, GitHub, Slack, Jenkins.
  • Methodologies: Agile, Waterfall.

Atos Corp

Senior Developer, Architect
Duration: 01/2011 - 05/2014
Project: Redbus

  • Acted as Architect and Senior Developer, leading a team of 2 developers.
  • Designed and implemented web services to enhance system functionality.
  • Utilized technologies including Android, JSP, Java Spring, Oracle, PostgreSQL, NFC, C++, REST.
  • Managed and processed large amounts of data efficiently.
  • Implemented data synchronization mechanisms to ensure data consistency across the system.
  • Developed data consolidation strategies for accurate and reliable data aggregation.
  • Ensured consistency control across various system components.
  • Created features for card balance management.
  • Implemented control over decentralized transaction processing to enhance system reliability.
  • Applied object-oriented architecture using domain-driven design (DDD) principles to structure the system effectively.
  • Ensured high code quality and adherence to best practices through code reviews.
  • Provided mentoring and technical guidance to team members.
  • Architecture: Object-oriented, domain-driven design (DDD).
  • Languages: Java, JSP, C++.
  • Libraries: Spring, NFC, REST.
  • Design Patterns: Singleton, Factory, Observer, Strategy.
  • Tools: Jira, GitHub, Jenkins.
  • Methodologies: Agile, Waterfall.

Belatrix S.A.

Senior Developer
Duration: 03/2010 - 01/2011
Project: StoneRiver

  • Acted as Senior Developer for the StoneRiver project.
  • Developed and maintained applications using Spring, Mule, Java, and Flex.
  • Worked with databases including DB2 and MySQL.
  • Followed Agile methodologies and used Rally for project management.
  • Methodologies: Agile.
  • Architecture: Service-oriented architecture (SOA).
  • Languages: Java.
  • Libraries: Spring, Mule, Flex.
  • Design Patterns: MVC, DAO.
  • Tools: Rally, Eclipse, DB2, MySQL.

Senior Developer
Duration: 08/2009 - 03/2010
Project: Talent

  • Acted as Senior Developer for the Talent project.
  • Developed applications using Spring, Java, JSP, and Hibernate.
  • Followed Agile methodologies and used Rally for project management.
  • Methodologies: Agile.
  • Architecture: Model-View-Controller (MVC).
  • Languages: Java, JSP.
  • Libraries: Spring, Hibernate.
  • Design Patterns: MVC, DAO.
  • Tools: Rally, Eclipse, MySQL.

Hewlett Packard Argentina

Specialist Developer
Duration: 02/2008 - 08/2009
Project: SABRE AACoRN System

  • Acted as Senior Developer for the SABRE AACoRN System project.
  • Developed applications using Java, Swing, EJB2, and Oracle.
  • Worked with technologies including SABRE, Web Services, JSP, JaxWS, Axis 2, and Ant.
  • Followed CMMI Level 3 standards and used tools like JIRA, Accurev, UML, StarTeam, and SAP.
  • Designed and implemented core functionalities for the SABRE AACoRN System, ensuring high performance and reliability.
  • Developed complex user interfaces using Swing for a seamless user experience.
  • Integrated various web services and ensured smooth communication between different system components.
  • Utilized EJB2 for building scalable and transactional business applications.
  • Conducted code reviews and enforced best practices to maintain high code quality.
  • Collaborated with cross-functional teams to gather requirements and deliver robust solutions.
  • Provided technical support and training to team members and end-users.
  • Methodologies: Agile.
  • Architecture: Service-oriented architecture (SOA).
  • Languages: Java, JSP.
  • Libraries: Swing, EJB2, JaxWS, Axis 2.
  • Design Patterns: MVC, DAO.
  • Tools: JIRA, Accurev, UML, StarTeam, SAP.

Suris S.A.

Developer
Duration: 01/2007 - 02/2008
Project: Senectus / Vitae System

  • Acted as Developer for the Senectus / Vitae System project.
  • Developed applications using Java, Spring, ExtJS, and Hibernate.
  • Designed and implemented REST APIs for seamless communication between client and server.
  • Worked with SVN for version control, Eclipse as the development environment, and MySQL for database management.
  • Ensured robust and scalable application architecture.
  • Conducted unit testing and debugging to maintain code quality.
  • Collaborated with cross-functional teams to gather requirements and deliver solutions.
  • Methodologies: Agile.
  • Architecture: RESTful architecture.
  • Languages: Java.
  • Libraries: Spring, ExtJS, Hibernate.
  • Design Patterns: MVC, DAO.
  • Tools: SVN, Eclipse, MySQL.

Imaquio S.A.

Technical Leader & Developer
Duration: 01/2002 - 01/2005
Project: Nuebus

  • Acted as Architect & Technical Leader for the Nuebus project.
  • Developed object-oriented applications with domain-driven design principles.
  • Utilized technologies including Java, JSP, and Oracle.
  • This was a system to sell long-distance tickets.
  • Designed and implemented core functionalities for ticket booking and management.
  • Ensured high availability and reliability of the system, which is still in operation.
  • Methodologies: Waterfall.
  • Architecture: Object-oriented architecture, domain-driven design (DDD).
  • Languages: Java, JSP.
  • Libraries: Oracle.
  • Design Patterns: MVC, DAO.
  • Tools: Eclipse, Oracle.

Technical Leader
Duration: 01/2005 - 01/2007
Project: Amadeus Client

  • Acted as Technical Leader for the Amadeus Client project.
  • Developed applications using EJB 2, Oracle, and Web Services.
  • Developed JSP-based user interfaces for seamless user experience.
  • This was a system to sell tickets for an airline.
  • Designed and implemented core functionalities for ticket booking and management.
  • Collaborated with cross-functional teams to integrate various services and APIs.
  • Conducted performance tuning and optimization to enhance system efficiency.
  • Methodologies: Waterfall.
  • Architecture: Service-oriented architecture (SOA).
  • Languages: Java, JSP.
  • Libraries: EJB 2, Oracle, Web Services.
  • Design Patterns: MVC, DAO.
  • Tools: Eclipse, Oracle.

CRICYT

Developer, Designer, Analyst
Duration: 05/2006 - 06/2007
Project: Employee assistance control system

  • Developed and designed the employee assistance control system.
  • Used Java, Swing, and PostgreSQL.
  • Implemented an Event Sourcing Database for reliable event tracking.
  • Applied real object-oriented architecture with CQRS (Command Query Responsibility Segregation) to separate read and write operations.
  • Maintained the event store for capturing application state changes.
  • Projections to modify assistance motives in the past, ensuring accurate historical data.
  • Provided technical support and training to users.
  • Methodologies: Waterfall.
  • Architecture: Object-oriented architecture, CQRS.
  • Languages: Java.
  • Libraries: Swing, PostgreSQL.
  • Design Patterns: Event Sourcing, CQRS.
  • Tools: Eclipse, PostgreSQL.

Senectus

Developer, Architect
Duration: 01/2000 - 01/2002
Project: Wine traceability system

  • Engineered, conceptualized, and evaluated the wine traceability system.
  • Leveraged technologies such as Fox Pro.
  • Guaranteed system scalability and enhanced performance.
  • Partnered with cross-functional teams to collect and refine requirements.
  • Performed code inspections and enforced best practices for code integrity.
  • Led a team of 3 developers.
  • Methodologies: Waterfall.
  • Architecture: Object-oriented architecture.
  • Languages: Fox Pro.
  • Libraries: N/A.
  • Design Patterns: MVC, DAO.
  • Tools: Fox Pro.

Altamed

Developer, Architect
Duration: 05/1998 - 01/2000
Project: Medicine insurance system

  • Developed, designed, and analyzed the medicine insurance system.
  • Utilized technologies including Fox Pro.
  • Ensured system scalability and performance optimization.
  • Collaborated with cross-functional teams to gather and refine requirements.
  • Conducted code reviews and implemented best practices for code quality.
  • Provided technical support and training to end-users.
  • Methodologies: Waterfall.
  • Architecture: Object-oriented architecture.
  • Languages: Fox Pro.
  • Libraries: N/A.
  • Design Patterns: MVC, DAO.
  • Tools: Fox Pro.

Banco de Prevision Social

Developer
Duration: 08/1996 - 05/1998
Project: Office supply tracking system

  • Developed, designed, and analyzed the office supply tracking system.
  • Acted as the architect for the refactor to convert the applications to Fox Pro.
  • Utilized technologies including Clipper and Fox.
  • Ensured system scalability and performance optimization.
  • Collaborated with cross-functional teams to gather and refine requirements.
  • Conducted code reviews and implemented best practices for code quality.
  • Provided technical support and training to end-users.
  • Methodologies: Waterfall.
  • Architecture: Object-oriented architecture.
  • Languages: Clipper, Fox Pro.
  • Libraries: N/A.
  • Design Patterns: MVC, DAO.
  • Tools: Clipper, Fox Pro.

Previous Experience

  • Technologies: Clipper, Fox, Fox Pro, Basic, Pascal, Java, JSP, EJB, HTTP, JavaScript, HTML, Oracle, MySQL, PostgreSQL, SQL Server.

    • Clipper: Used for developing database applications.
    • Fox/Fox Pro: Utilized for building data-centric applications with a focus on performance and scalability.
    • Basic: Employed for early-stage programming and scripting tasks.
    • Pascal: Applied for structured programming and algorithm development.
    • Java: Leveraged for building robust, high-performance applications.
    • JSP: Used for creating dynamic web pages and server-side applications.
    • EJB: Utilized for developing scalable, transactional, and multi-tier enterprise applications.
    • HTTP: Applied for web communication and data transfer.
    • JavaScript: Used for client-side scripting and enhancing user interfaces.
    • HTML: Employed for structuring web content.
    • Oracle: Utilized for managing large-scale databases.
    • MySQL: Used for relational database management and data storage.
    • PostgreSQL: Leveraged for advanced database management and complex queries.
    • SQL Server: Applied for enterprise-level database solutions and data warehousing.

  • Roles: Various development and architecture roles since 1996.

    • Developer: Responsible for coding, debugging, and implementing software solutions.
    • Designer: Involved in creating software designs and architecture.
    • Analyst: Conducted system analysis and requirement gathering.
    • Architect: Designed and planned software architecture and system integration.
    • Technical Leader: Led development teams and provided technical guidance.
    • Mentor: Provided training and support to junior developers.

UTN Universidad Tecnológica Nacional

Teacher
Duration: 2013 - Present

Course: Microservices Architecture

  • Technologies: Java, Angular, Golang, Node.js, TypeScript, Kotlin, RabbitMQ, MongoDB, Redis, Kafka.
  • Responsibilities: Developed and taught the Microservices Architecture course.
  • Study Plan: Program and Study Plan.
  • Code Samples: GitHub - nmarsollier.
  • Duration: 2018 - Present.

Course: Advanced Programming

  • Technologies: React, Node.js with TypeScript.
  • Responsibilities: Developed and taught the Advanced Programming course.
  • Study Plan: Study Plan.
  • Code Samples: GitHub - nmarsollier.
  • Duration: 2013 - 2023.

Repositories

  • Fit Fat Android App: GitHub - Fit Fat

    • Controls fat and weight in different ways.
    • MVI Demo app in two versions: Android SDK and Jetpack Compose.

  • Fit Fat in React Native: GitHub - Fit Fat React Native

    • Same functionality as the Android app but implemented in React Native.

  • Ecommerce Microservices: GitHub - Ecommerce

    • Ecommerce microservices environment for educational purposes.
    • Includes 5 microservices written in Golang, TypeScript, Java, and Kotlin.

  • Golang Tutorial: GitHub - Golang Tutorial

    • Advanced Golang ideas and techniques.
    • Includes innovative concepts and high-quality code.

  • Battery Switch Widget for Android: GitHub - Battery Switch

    • Switches the battery charger on/off based on battery percentage.
    • Supports Tasmota.

  • Volume Widget for Android: GitHub - Volume Widget

    • A widget to control volume on Android devices.

  • My IP Widget for Android: GitHub - My IP Widget

    • Displays the local IP address in a widget.

  • QR Barcode: GitHub - QR Barcode

    • Generates barcodes from strings for demo purposes.
    • Implemented in Golang.

  • Semver Json Store: GitHub - Semver Json Store

    • Downloads text resources in mobile apps while controlling versions.
    • Implemented in TypeScript/Node.js for educational purposes.

  • Document Store: GitHub - Document Store

    • A simple document store implemented in Golang for educational purposes.

  • Card Game in React: GitHub - Card Game

    • Backend for a card game implemented in React.
    • Designed for educational purposes.

  • 4 in Line Game: GitHub - 4 in Line

    • A simple game for educational purposes.

  • Crosswords Board Generator: GitHub - Crosswords

    • Generates crossword boards.
    • Includes interesting problem-solving techniques.
    • Implemented in Java.

  • React Lessons: GitHub - React Lessons

    • Educational repository with good and bad examples of React code.

  • JavaScript Lessons: GitHub - JavaScript Lessons

    • Educational repository with good and bad examples of JavaScript code.

  • Node Lessons: GitHub - Node Lessons

    • Educational repository with good and bad examples of Node.js code.

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