Elder Santos, Machine Learning Developer in São José dos Campos - State of São Paulo, Brazil
Elder Santos

Machine Learning Developer in São José dos Campos - State of São Paulo, Brazil

Member since March 6, 2013
An accomplished software engineer, Elder specializes in machine learning and data science. He has expertise in the full life cycle of the software design process, including: requirement specifications, prototyping, proof of concept, human-interface design, implementation, testing, and maintenance.
Elder is now available for hire


  • Joinesty, Inc.
    Amazon Web Services (AWS), Angular, React, AWS, Node.js, TypeScript, Python...
  • LynasLogic
    Amazon Web Services (AWS), Oracle, Dapper, NHibernate, Entity Framework...
  • Microsoft Innovation Center
    Silverlight, Windows Communication Framework (WCF)...



São José dos Campos - State of São Paulo, Brazil



Preferred Environment

GitHub, Sublime Text, MacOS

The most amazing...

...software I've built is an aircraft maintenance program directly connected to the military 1553 bus, which uses shortest path algorithms and a little AI.


  • Lead Software Engineer

    2016 - PRESENT
    Joinesty, Inc.
    • Created the whole infrastructure back- and front-end to support thousands of clients.
    • Managed the development team.
    • Designed and built a solution to store sensitive data from customers.
    Technologies: Amazon Web Services (AWS), Angular, React, AWS, Node.js, TypeScript, Python, .NET Core, Microsoft SQL Server, C#
  • Technical Lead

    2008 - 2016
    • Supported software engineering team with technical decision-making.
    • Worked as a senior developer in the .NET platform.
    • Handled the development of applications related to financial products.
    • Maintained old or outdated C# projects for customers around the world.
    • Updated a legacy application using ASP.NET MVC, C#, JavaScript, MVVM, and Twitter Bootstrap, releasing an entirely new version.
    Technologies: Amazon Web Services (AWS), Oracle, Dapper, NHibernate, Entity Framework, Silverlight, Azure, AWS, JavaScript, Windows Communication Framework (WCF), Windows Presentation Foundation (WPF), PostgreSQL, PL/SQL, T-SQL, C#
  • Technical Lead

    2007 - 2008
    Microsoft Innovation Center
    • Handled technical requirements in interop projects.
    • Developed cross-platform software for Windows and Linux.
    • Worked with the most up-to-date Microsoft technologies including Silverlight, WPF, WCF, and WWF.
    • Researched the local market and provided training for locals.
    • Supported local companies with technologies like Microsoft Silverlight, WPF, WCF, WWF, and SQL Server.
    Technologies: Silverlight, Windows Communication Framework (WCF), Windows Presentation Foundation (WPF), WWF, Java, Linux, Oracle, Microsoft SQL Server, SharePoint, VB.NET, C#
  • Solution Archtect

    2007 - 2008
    Onset Technologies
    • Provided interoperability between .NET and Ruby applications.
    • Analyzed software requirements and provided solutions based on the Microsoft platform.
    • Solved business problems with solutions architected under the .NET platform and other Microsoft products.
    • Managed internal and external projects using Microsoft SharePoint technologies.
    • Created a global application for Johnson & Johnson to monitor all their other applications (including ERP) around the world.
    Technologies: SharePoint, C++, VB.NET, MySQL, Oracle, Microsoft SQL Server, C#


  • SPL Fiscal (Development)

    A web application written in ASP.NET using NHibernate to handle ORM communication with SQL Server and Oracle databases. the app is used to generate digital files dynamically according to user configurations.

    Includes a great background execution process to analyze data and yield results in different formats.

  • Data Mining for Predictive Social Network Analysis (Publication)
    Analysts have come to recognize social network data as a virtual treasure trove of information for sensing public opinion trends and groundswells of support. In this article, Toptal Engineer Elder Santos describes the techniques he employed for a proof-of-concept that effectively analyzed Twitter Trend Topics to predict, as a sample test case, regional voting patterns in the 2014 Brazilian presidential election.


  • Languages

    Python, SQL, C#, HTML, R, C++, HTML5, TypeScript, JavaScript, CSS, Visual Basic 6 (VB6), Less, T-SQL, VB.NET, Java, C, F#, Snowflake
  • Frameworks

    Flask, .NET, ASP.NET MVC, Windows Presentation Foundation (WPF), AngularJS, Django, Express.js, Entity, Windows Communication Framework (WCF), Bootstrap, NHibernate, ASP.NET Web API, ADO.NET, Silverlight, WWF, .NET Core, Angular, Knockout.js, Caliburn, Hadoop, Spark, AWS HA
  • Libraries/APIs

    jQuery, Node.js, jQuery UI, Entity Framework, Facebook API, LinkedIn API, Twitter API, Backbone.js, React, Instagram API
  • Tools

    GitHub, Sublime Text, Microsoft Visual Studio, Mercurial, TextMate, LINQ to SQL, Subversion (SVN), Dapper, Microsoft Project, Emacs, Microsoft Team Foundation Server, Talend ETL, AWS Athena, Amazon Athena, Jira, AWS CodeBuild, AWS Glue, DataViz
  • Paradigms

    Object-oriented Programming (OOP), Agile Software Development, Functional Programming, Procedural Programming, Design Patterns, COM+, Distributed Computing, Parallel Computing, Microservices Architecture, Database Design, Web Architecture, API Architecture, REST, REST API Architecture, ETL, Requirements Analysis
  • Storage

    MongoDB, Microsoft SQL Server, JSON, NoSQL, PostgreSQL, PL/SQL, MySQL, SQLite, Redshift, Apache Hive, AWS S3, Data Lakes, AWS Data Pipeline Service, Databases
  • Other

    Machine Learning, WPF, COM, AWS, ETL Tools, Full-stack, Cloud Microservices, Integration, Fivetran, Data Analytics, Data Analysis, Data Warehousing, Data Engineering, Big Data, Big Data Architecture, AWS API Gateway, Data Reporting, Data, Data Warehouse Design, Code Architecture, Data Architecture, System Architecture, Requirements & Specifications, User Requirements, Architecture
  • Platforms

    Oracle, SharePoint, Amazon Web Services (AWS), Windows, iOS, Linux, MacOS, Azure


  • Master degree in Artificial Intelligence
    2014 - 2016
    Universidade Federal de São Paulo - Sao Jose dos Campos
  • Bachelor degree in Computer Science
    2008 - 2012
    Universidade Federal de Sao Carlos - Sao Carlos, Brazil


  • Microsoft® Certified Technology Specialist
  • Microsoft Certified Dynamics Specialist
  • Microsoft Certified Application Developer
  • Microsoft Certified Systems Administrator:
  • Microsoft Certified Database Administrator
    JUNE 2003 - PRESENT
  • Microsoft Certified Solution Developer

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