- Email: [email protected]
- LinkedIn: linkedin.com/in/nestor-marsollier-a2006117
- Phone: +54 261 503 5118
- Address: Villa Nueva, Guaymallén, Mendoza, Argentina
- Languages: Spanish (native), English (advanced)
- Birth Date: 10-15-1976
- Degree: B.S. Computer Systems Engineering
- Institution: UTN Universidad Tecnológica Nacional, Mendoza, Argentina
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.
- 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
- 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:
- Institution: UTN (University)
- Courses: Microservices Architecture
- Code Samples: Microservices Architecture
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.
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.
Technical Leader
Duration: 05/2020 - 09/2021
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
-
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.
Teacher
Duration: 2013 - Present
- 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.
- 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.
-
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.
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Fit Fat in React Native: GitHub - Fit Fat React Native
- Same functionality as the Android app but implemented in React Native.
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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.
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Battery Switch Widget for Android: GitHub - Battery Switch
- Switches the battery charger on/off based on battery percentage.
- Supports Tasmota.
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Volume Widget for Android: GitHub - Volume Widget
- A widget to control volume on Android devices.
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My IP Widget for Android: GitHub - My IP Widget
- Displays the local IP address in a widget.
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QR Barcode: GitHub - QR Barcode
- Generates barcodes from strings for demo purposes.
- Implemented in Golang.
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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.
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4 in Line Game: GitHub - 4 in Line
- A simple game for educational purposes.
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Crosswords Board Generator: GitHub - Crosswords
- Generates crossword boards.
- Includes interesting problem-solving techniques.
- Implemented in Java.
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React Lessons: GitHub - React Lessons
- Educational repository with good and bad examples of React code.
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JavaScript Lessons: GitHub - JavaScript Lessons
- Educational repository with good and bad examples of JavaScript code.
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Node Lessons: GitHub - Node Lessons
- Educational repository with good and bad examples of Node.js code.