Elder Santos
Verified Expert in Engineering
Full-stack Software Engineer and Developer
São José dos Campos - State of São Paulo, Brazil
Toptal member since March 13, 2013
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
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
Availability
Preferred Environment
MacOS, Windows, Visual Studio Code (VS Code), Linux, Visual Studio
The most amazing...
...project I've created was an aircraft maintenance program connected to the 1553 bus protocol. It uses enhanced shortest path algorithms and system optimizations.
Work Experience
CTO
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.
Lead Software Engineer
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.
CTO
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.
Lead Developer (via Toptal)
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.
Software Developer
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.
Technical Lead
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.
Technical Lead
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.
Solution Archtect
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.
Experience
Sony Ci
https://www.sonymcs.com/SPL Fiscal
https://www.avalara.com/br/en/solucoes/solucao-de-emissao-de-documentos-fiscais.htmlIt includes a great background execution process to analyze data and yield results in different formats.
Joinesty Password Manager
Education
Master's Degree in Artificial Intelligence
Federal University of São Paulo - Sao Jose dos Campos
Bachelor's Degree in Computer Science
Federal University of São Carlos - Sao Carlos, Brazil
Certifications
Microsoft Certified Technology Specialist
Microsoft
Microsoft Certified Dynamics Specialist
Microsoft
Microsoft Certified Application Developer
Microsoft
Microsoft Certified Systems Administrator:
Microsoft
Microsoft Certified Database Administrator
Microsoft
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
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, T-SQL (Transact-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
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
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