Publication
Data Mining for Predictive Social Network Analysis
https://www.toptal.com/developers/data-science/social-network-data-mining-for-predictive-analysis
Elder is available for hire
Hire ElderElder Santos
Verified Expert in Engineering
Full-stack Software Engineer and Developer
Montevideo, Montevideo Department, Uruguay
Toptal member since March 13, 2013
Bio
Elder is an accomplished full-stack software engineer. From startups to enterprise ventures, his journey has been marked by a trail of successes. Elder has expertise in the full lifecycle of the software design process, including requirement specifications, prototyping, proof of concept, implementation, testing, and maintenance.
Portfolio
Demo Force
AWS IoT, Node.js, AWS Lambda, DevOps, Artificial Intelligence (AI)...
Joinesty, Inc.
Amazon Web Services (AWS), Angular, React, Node.js, TypeScript, Python...
GSI Technologies LLC
Architecture, Technical Leadership, Prompt Engineering, Web App Development...
Experience
- JavaScript - 6 years
- Python - 6 years
- SQL - 6 years
- Node.js - 5 years
- Machine Learning - 5 years
- Go - 4 years
- Microservices Architecture - 3 years
- Express.js - 2 years
Work Experience
CTO
2023 - PRESENT
Demo Force
- Built and led a development team of 1–5 members for a SaaS solution in stealth mode.
- Designed system architecture, defined metrics, and established team processes.
- Coded the MVP, implemented monitoring systems, and set up CI pipelines.
- Conducted code reviews, selected the technology stack, and engaged with customers.
- Contributed to Series A funding preparations.
Technologies: AWS IoT, Node.js, AWS Lambda, DevOps, Artificial Intelligence (AI), Large Language Models (LLMs), Agile Software Development, Security, Google Cloud, System Architecture, Application Architecture, HubSpot
Lead Software Engineer
2016 - PRESENT
Joinesty, Inc.
- Created the whole cloud infrastructure and defined the stack for the back end and front end to support thousands of clients.
- Managed the development team. Talked with stakeholders and investors about product road map and deliverables.
- Designed and built a solution to store sensitive data from customers.
Technologies: Amazon Web Services (AWS), Angular, React, Node.js, TypeScript, Python, .NET Core, Microsoft SQL Server, C#, Architecture, Front-end, Back-end, Azure, PostgreSQL, CTO, SaaS, Google Cloud Platform (GCP), APIs, Amazon EC2, gRPC, Solution Architecture, Programming, Distributed Systems, Docker, App Infrastructure, Cybersecurity, PCI, PCI Compliance, PCI DSS, Agile Project Management, Cloud Architecture, Engineering, Estimations, Large Language Models (LLMs), Minimum Viable Product (MVP), Frameworks, Fractional CTO, NestJS, Clean Architecture, Product Development, DevOps, Google Cloud, GitHub, System Architecture, Application Architecture, Cloud, Prompt Engineering, Infrastructure, HubSpot, Stripe
Tech Lead and Solutions Architect
2025 - 2025
GSI Technologies LLC
- Worked as a tech lead for GSI-Tech and architected a cloud-native AWS infrastructure with CI/CD pipelines, containerized services, and serverless functions. Led the team in implementing secure, scalable architecture while mentoring on AWS best practices.
- Utilized Jira, Slack, GitHub, CodePipeline, CodeBuild, AWS (Amplify, ECS, Lambda, S3, and CloudFront), Docker, Amazon ECS with blue/green Deployment, Node.js, Python 3.13 (Lambda Functions), CloudWatch, Dead Letter Queues (DLQ), SQS, and Secrets Manager.
- Deployed a production app with automated CI/CD in AWS. Implemented zero-downtime ECS blue/green deployments with LB. Launched a public landing page with CloudFront-hosted static content. Established secure VPC architecture with CloudWatch monitoring.
Technologies: Architecture, Technical Leadership, Prompt Engineering, Web App Development, Large Language Models (LLMs), Machine Learning, AWS IoT, PostgreSQL, Pinecone, Next.js, Python 3, AWS Lambda, Vanta, SOC 2, Stripe, AWS ECS Fargate, Redshift, Plaid API, AWS Amplify
CTO
2023 - 2024
Bridge Informatics
- Designed architecture for a SaaS solution that is aligned with the business strategy.
- Built the MVP, defined the tech stack, and established DevOps, CI pipelines, and monitoring.
- Recruited and managed a development team of 1–5 members.
- Assisted with business decisions and investor meetings to secure funding. Oversaw product validation with early customers, preparing for operational expansion.
Technologies: Bioinformatics, Data Pipelines, AWS IoT, SaaS, DevOps, Terraform, ECS, AWS Lambda, Amazon S3 (AWS S3), PostgreSQL, System Architecture, Infrastructure, Stripe
Lead Developer (via Toptal)
2021 - 2024
Andrew Koudijs
- Acted as a tech lead, defining and implementing the whole architect on the back end and front end.
- Designed and implemented an inventory and eCommerce system for cannabis retail and wholesale.
- Improved the internal and external logistics process, accelerating the lead time from cultivation to sales.
Technologies: JavaScript, Web Development, CSS, HTML, HTML5, Technical Leadership, Architecture, Web Architecture, Next.js, Go, Amazon Web Services (AWS), Swift, Mobile, Agile Project Management, Cloud Architecture, Engineering, Estimations, Full-stack Development, Minimum Viable Product (MVP), Frameworks, Fractional CTO, NestJS, Clean Architecture, Firebase, Product Development, DevOps, SaaS Product Management, GitHub, System Architecture, Database Architecture, Infrastructure, ETL
Software Developer
2013 - 2021
Toptal Clients
- Designed and developed a web proxy filter in Go. The product was composed of a web proxy plus a web administration tool. Both components were written in Go.
- Developed the filter according to the required RFCs and implemented the best security practices.
- Contributed to gathering interest from big players in the data loss prevention industry.
Technologies: Go, React, Node.js, TypeScript, Amazon Web Services (AWS), Elasticsearch, Docker, Bootstrap, jQuery, GraphQL, Python, Django, Flask, Next.js, C#, SQL, Software Architecture, SaaS, Multitenancy, APIs, Solution Architecture, Amazon DynamoDB, Programming, CI/CD Pipelines, Testing, FFmpeg, Code Review, Engineering, API Integration, Estimations, Web App Development, Full-stack Development, Optical Character Recognition (OCR), Data Privacy, Data Security, General Data Protection Regulation (GDPR), Compliance, Minimum Viable Product (MVP), Frameworks, Fractional CTO, Shopify, Flutter, Firebase, DevOps, GitHub, System Architecture, eCommerce, Database Architecture, Infrastructure, ETL
Technical Lead
2008 - 2016
LynasLogic
- Supported the 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 and 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, Microsoft Silverlight, Azure, JavaScript, Windows Communication Foundation (WCF), Windows Presentation Foundation (WPF), PostgreSQL, PL/SQL, Transact-SQL (T-SQL), C#, SaaS, Multitenancy, APIs, Solution Architecture, Programming, Docker, CTO, Code Review, Project Management, Web App Development, Full-stack Development, Optical Character Recognition (OCR), Frameworks, GitHub, System Architecture, GitHub Actions
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: Microsoft Silverlight, Windows Communication Foundation (WCF), Windows Presentation Foundation (WPF), WWF, Java, Linux, Oracle, Microsoft SQL Server, SharePoint, VB.NET, C#, SQL Server BI, Software Architecture, Solution Architecture, Distributed Systems, Mobile, Frameworks, GitHub, System Architecture, GitHub Actions
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#, ASP.NET, ASP.NET MVC, jQuery, App Infrastructure, GitHub, GitHub Actions
Project History
Sony Ci
https://www.sonymcs.com/Sony's Ci Media Cloud expands into cloud-native asset management. With the addition of a catalog, Ci provides content owners, studios, production companies, broadcasters, sports leagues, music labels, and large corporations with a comprehensive system that supports content management.
SPL Fiscal
https://www.avalara.com/br/en/solucoes/solucao-de-emissao-de-documentos-fiscais.htmlA 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.
It includes a great background execution process to analyze data and yield results in different formats.
It includes a great background execution process to analyze data and yield results in different formats.
Joinesty Password Manager
A web-based and browser extension application to manage passwords and secret notes over different devices and share them with team workers. It is hosted on AWS and uses several services from that. The core back end is in Go and the front end is TypeScript with React.
Education
2014 - 2016
Master's Degree in Artificial Intelligence
Federal University of São Paulo - Sao Jose dos Campos
2008 - 2012
Bachelor's Degree in Computer Science
Federal University of São Carlos - Sao Carlos, Brazil
Certifications
DECEMBER 2008 - PRESENT
Microsoft Certified Technology Specialist
Microsoft
AUGUST 2008 - PRESENT
Microsoft Certified Dynamics Specialist
Microsoft
AUGUST 2008 - PRESENT
Microsoft Certified Application Developer
Microsoft
SEPTEMBER 2004 - PRESENT
Microsoft Certified Systems Administrator:
Microsoft
JUNE 2003 - PRESENT
Microsoft Certified Database Administrator
Microsoft
JANUARY 2002 - PRESENT
Microsoft Certified Solution Developer
Microsoft
Skills
Libraries/APIs
REST APIs, Node.js, jQuery, React, jQuery UI, Entity Framework, Vue, Facebook API, LinkedIn API, X (formerly Twitter) API, Backbone.js, Instagram API, NumPy, FFmpeg, Stripe, Claude API, Plaid API, AWS Amplify
Tools
GitHub, Sublime Text, Microsoft Visual Studio, Amazon Elastic Container Service (ECS), Mercurial, TextMate, LINQ to SQL, Subversion (SVN), RabbitMQ, Microsoft Silverlight, Dapper, Azure Kubernetes Service (AKS), Visual Studio, AWS Key Management Service (KMS), Webpack, Amazon Simple Queue Service (SQS), Amazon Simple Notification Service (SNS), Microsoft Project, Emacs, Microsoft Team Foundation Server, Amazon Athena, Jira, AWS CodeBuild, AWS Glue, DataViz, SQL Server BI, Terraform
Languages
Go, Python, SQL, TypeScript, JavaScript, C#, HTML, C#.NET, R, C++, HTML5, CSS, GraphQL, Visual Basic 6 (VB6), Less, Transact-SQL (T-SQL), VB.NET, Java, C, F#, Snowflake, Python 3, Swift
Frameworks
Flask, .NET, ASP.NET MVC, Windows Presentation Foundation (WPF), AngularJS, Django, Express.js, Entity, Bootstrap, NHibernate, ASP.NET Web API, .NET 6, Flutter, ADO.NET, WWF, .NET Core, Angular, ASP.NET, Knockout (Knockout.js), Hadoop, Spark, AWS HA, Next.js, gRPC, NestJS
Paradigms
Microservices, Object-oriented Programming (OOP), Application Architecture, Agile Software Development, Functional Programming, Procedural Programming, Design Patterns, Microservices Architecture, ETL, Testing, Agile Project Management, Clean Architecture, DevOps, COM+, Distributed Computing, Parallel Computing, Database Design, Web Architecture, API Architecture, REST, REST API Architecture, Requirements Analysis
Platforms
Amazon Web Services (AWS), Docker, Windows, Google Cloud Platform (GCP), AWS Lambda, Amazon EC2, Linux, Oracle, Software Design Patterns, Firebase, HubSpot, SharePoint, Azure Functions, Azure IaaS, Ubuntu, Visual Studio Code (VS Code), iOS, MacOS, Azure, Kubernetes, Apache Kafka, Mobile, Shopify, AWS IoT, Vanta
Storage
MongoDB, PostgreSQL, Microsoft SQL Server, Relational Databases, Database Architecture, JSON, NoSQL, Amazon S3 (AWS S3), Amazon DynamoDB, Google Cloud, PL/SQL, Redis, Elasticsearch, SQL Server 2012, Azure SQL, MySQL, SQLite, Redshift, Apache Hive, Data Lakes, AWS Data Pipeline Service, Databases, Data Pipelines
Industry Expertise
Cybersecurity, Project Management, Bioinformatics
Other
CTO, Machine Learning, Full-stack, System Architecture, Architecture, Back-end, Web Scraping, Amazon RDS, SaaS, APIs, Business Architecture, Enterprise Architecture, Solution Architecture, Web Applications, Programming, Back-end Development, CI/CD Pipelines, Artificial Intelligence (AI), Code Review, App Infrastructure, Web Development, Cloud Architecture, Web App Development, Full-stack Development, Minimum Viable Product (MVP), Frameworks, Fractional CTO, Software Development, GitHub Actions, Infrastructure, Technical Leadership, Leadership, Windows Communication Foundation (WCF), Data Engineering, Software Architecture, Software Design, Multitenancy, Multithreading, Distributed Systems, Natural Language Processing (NLP), Engineering, API Integration, Estimations, Data Privacy, Large Language Models (LLMs), Product Development, SaaS Product Management, eCommerce, Cloud, Compliance, General Data Protection Regulation (GDPR), Data Security, COM, Amazon Kinesis, Crypto, Elastic Load Balancers, ETL Tools, Integration, Fivetran, Data Analytics, Data Analysis, Data Warehousing, Big Data, Big Data Architecture, Amazon API Gateway, Data Reporting, Data, Data Warehouse Design, Code Architecture, Data Architecture, Requirements & Specifications, User Requirements, Front-end, Vi, Deep Learning, Data Structures, Mathematics, Computer Systems, Algorithms, Operating Systems, Networks, Compilers, Open-source LLMs, Neural Networks, PCI, PCI Compliance, PCI DSS, Computer Organization, Dynamics CRM 365, Optical Character Recognition (OCR), Security, ECS, Prompt Engineering, ChatGPT API, Pinecone, SOC 2, AWS ECS Fargate
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