Alejandro is available for hire
Hire AlejandroAlejandro Santiago
Verified Expert in Engineering
Full-stack Engineer and Developer
Atlanta, United States
Toptal member since August 18, 2026
Bio
Alejandro is a senior full-stack engineer with over 10 years of experience building internal platforms and workflow automation for clients, including Oracle, Santander North America, and Angel Oak Capital Advisors. His primary expertise is in Node.js, Python, and React for financial services and enterprise systems, where he thrives in cloud-native environments. Alejandro reduced manual operational effort by 30% while at Santander.
Portfolio
Gpt Ten
Artificial Intelligence (AI)
Santander Holdings USA
React, FastAPI, Python, SQL, JavaScript
Oracle
JavaScript, RedwoodJS, SQL, Python
Experience
- JavaScript - 12 years
- Vue - 10 years
- Node.js - 10 years
- Python - 10 years
- Three.js - 7 years
- React - 7 years
- Artificial Intelligence (AI) - 5 years
- Retrieval-augmented Generation (RAG) - 3 years
Preferred Environment
Amazon Web Services (AWS), Azure, Docker, NGINX, CI/CD Pipelines, Microservices, Cypress, Jest, Selenium
The most amazing...
...platform I've built is a risk-assessment tool for a $20 billion asset manager that enabled real-time evaluation of all US commercial banks.
Work Experience
Co-founder, CTO
2024 - PRESENT
Gpt Ten
- Co-founded an AI-first software company focused on redefining how businesses build and automate workflows through a visual programming paradigm.
- Architected and continuously evolved a visual programming language purpose-built for AI workflows, enabling rapid prototyping and deployment of intelligent systems.
- Built and maintained the full-stack platform from the ground up, including front-end, back-end, and cloud infrastructure.
- Defined and executed the product roadmap, aligning technical direction with market demand and emerging AI trends.
- Established and enforced engineering best practices, including modular architecture, performance optimization, and scalable deployment pipelines.
Technologies: Artificial Intelligence (AI)
Contract Senior Applications Engineer
2025 - 2026
Santander Holdings USA
- Reduced manual operational effort by 30%, accelerating cross-team workflows, by architecting and delivering internal web applications in Node, Vue, FastAPI, Python, and SQL.
- Accelerated data pipeline reliability by engineering Python and JavaScript ingestion services that cut data lag from hours to near-real-time, improving downstream reporting accuracy.
- Hardened system security posture across 3+ production services by implementing SOLID engineering practices and consistent coding standards, resulting in improved maintainability and a measurable reduction in static analysis findings.
- Architected microservices in SQL, FastAPI, and Python.
Technologies: React, FastAPI, Python, SQL, JavaScript
Senior Applications Engineer
2024 - 2025
Oracle
- Reduced manual operational effort for supply chain analysts by automating product lifecycle workflows, including structure and pack creation, through the creation of new JavaScript Redwood fragments. Oracle OCI and SQL were used along with Python.
- Reduced code complexity and improved maintainability by refactoring the legacy JavaScript codebase, resulting in a 30% decrease in bugs reported by static analyzers while enhancing overall system performance by 20%.
- Created RAG pipelines in JavaScript/Python for the detection of supply chain bottlenecks in real-time using Oracle’s AI Agent Studio.
- Shipped multiple features now live in production for Oracle's global supply chain platform, supporting thousands of enterprise customers across multiple countries.
Technologies: JavaScript, RedwoodJS, SQL, Python
Senior Full-stack Developer
2022 - 2024
Angel Oak Capital
- Designed and launched BankSURF into production, a risk-assessment platform covering all US commercial and savings banks, enabling clients to evaluate institutional risk profiles in real time.
- Accelerated research workflows by 1.5x by building Python/Node.js data pipelines that automated the analysis of large fixed-income and mortgage-backed security datasets.
- Improved deployment frequency by 50% by implementing Azure DevOps CI/CD pipelines and cloud-native Azure microservices architecture across the engineering organization.
- Cut dashboard generation time from hours to minutes by designing automated reporting tools that replaced manual analyst workflows across the investment operations team.
- Delivered multiple production internal tools using Vue, React, Python, FastAPI, SQL, and Node.js.
Technologies: React, Python, .NET, FastAPI, SQL, Azure DevOps, CI/CD Pipelines, Azure
Senior Software Developer
2021 - 2022
Rainbow Design Services
- Enhanced field technician productivity for ISPs by delivering advanced GIS features in C#/.NET/Unity that visualized optic fiber layouts citywide, reducing route planning time by around 15%. The design of SQL queries was heavily involved.
- Resolved critical bugs in key GIS software (C#/Unity), improving stability for end-users and reducing crash rates by 10%, while enhancing overall performance and user experience.
- Built and optimized Unity workflows supporting large-scale GIS and fiber-network design, improving data retrieval and visualization performance for engineering and field operations.
Technologies: C#, Unity, .NET, SQL
Contract Software Developer
2019 - 2020
Vanguard
- Engineered the Financial Advisors Insights public-facing page in Vue, Node.js, and Express, increasing information accessibility for 500+ financial advisors monthly and boosting page engagement.
- Achieved over 90% automated test coverage on critical user flows by building Cypress/Jest/Mocha test suites fully integrated into the CI/CD pipeline.
- Collaborated with cross-functional teams to design and implement new features, resulting in a 15% increase in user satisfaction scores based on post-release surveys with Medallia.
Technologies: Express.js, Cypress, Jest, Mocha, CI/CD Pipelines
Co-founder, Tech Lead
2014 - 2018
Lumston
- Co-founded and scaled the engineering function from zero to 20+ engineers. Established standards, hired key talent, and delivered initial products and workflows on AWS, Node.js, Python, JavaScript, SQL, and Django.
- Drove end-to-end full-stack product delivery from zero to production, establishing greenfield engineering standards in security, reliability, and CI/CD that supported sustained company growth.
- Architected and delivered scalable web and cloud solutions for multiple client engagements, translating business requirements into production systems while leading technical design, estimation, code reviews, and engineering execution.
Technologies: Amazon Web Services (AWS), Python, JavaScript, SQL, Django, CI/CD Pipelines
Experience
Oracle's Product Lifecycle Management Tools
https://www.adelriosantiago.com/blog/my-work-at-oracleWorked on Oracle Fusion Cloud Product Lifecycle Management (PLM), part of Oracle Supply Chain Management Cloud. I developed production enterprise features using Oracle Redwood, including Guided Tasks for mass assignment of product structures across organizations.
I built reusable UI components, collaborated with product managers, designers, and back-end engineers, and improved maintainability through MVC-based component architecture. I also prototyped a GenAI-powered natural-language database search experience.
I built reusable UI components, collaborated with product managers, designers, and back-end engineers, and improved maintainability through MVC-based component architecture. I also prototyped a GenAI-powered natural-language database search experience.
Vanguard's Financial Advisor Insights
https://www.adelriosantiago.com/blog/financial-advisor-insightsDeveloped Vanguard’s Financial Advisor Insights, a production Vue application providing financial advisors with curated content on portfolio management, fixed income, and investment topics. I built responsive interfaces, dynamic article loading, advanced filtering, and SEO enhancements. I also integrated a Node.js/Express back end and implemented automated testing with Jest, Mocha, and Chai across desktop, tablet, and mobile experiences.
Angel Oak's Banksurf Application
https://www.adelriosantiago.com/blog/banksurfDeveloped BankSURF, a production financial analytics platform used to assess the performance and financial health of US banks using FFIEC regulatory data and a proprietary CAMEL-based scoring model. I built the platform with Vue, React, Node.js/Express, Python microservices, and Azure. I then optimized the processing of large financial datasets through lazy loading and efficient queries, and created interactive multidimensional visualizations using D3, Highcharts, and Three.js.
Education
2024 - 2026
Master's Degree in Artificial Intelligence
Kennesaw State University - Atlanta, GA, USA
2018 - 2020
Master's Degree in Business Administration (MBA)
University of Louisville - Louisville, KY, USA
2010 - 2014
Bachelor's Degree in Electronics and Computer Science Engineering
Tec De Monterrey - Guadalajara, Mexico
Certifications
APRIL 2025 - APRIL 2027
Oracle Redwood Associate
Oracle
OCTOBER 2024 - PRESENT
Microsoft Azure AI (AI-900)
Microsoft
SEPTEMBER 2024 - PRESENT
Azure Fundamentals (AZ-900)
Microsoft
APRIL 2023 - PRESENT
Professional Certificate in AR-VR Development and 3D Graphics
New York University
MARCH 2023 - PRESENT
AR/VR Development (NYU)
New York University
JULY 2021 - PRESENT
Verified International Academic Qualifications
WES
MARCH 2021 - PRESENT
Leading Teams xPRO
Massachusetts Institute of Technology
JULY 2015 - PRESENT
MongoDB for NodeJS Developers
MongoDB
Skills
Libraries/APIs
Three.js, Node.js, Vue, React, Pandas, NumPy, D3.js, TensorFlow
Tools
Mocha, NGINX, Shell
Languages
JavaScript, Python, Python 3, SQL, C#, TypeScript, PHP, Java
Frameworks
Express.js, Unity, Jest, RedwoodJS, .NET, Cypress, Django, Selenium, Laravel, Flask
Paradigms
ETL, Azure DevOps, Microservices, Management
Storage
PostgreSQL, MySQL, NoSQL, MongoDB
Platforms
Azure, Oracle, Amazon Web Services (AWS), Docker, Oracle Cloud Infrastructure (OCI)
Other
FastAPI, Pgvector, Artificial Intelligence (AI), CI/CD Pipelines, T-SQL, Vector Databases, RAG Systems, RAG Pipelines, Retrieval-augmented Generation (RAG), Responsiveness, User Interface (UI), User Experience (UX), Business, Fintech, Electronics, Computer Science, Engineering, Programming, Software, X Reality (XR), Virtual Reality (VR), Augmented Reality (AR), Extended Reality (XR), Leadership, Team Leadership
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