Alejandro Santiago, Developer in Atlanta, United States
Alejandro is available for hire
Hire Alejandro

Alejandro Santiago

Full-stack Engineer and Developer

Atlanta, United States

Toptal member since August 18, 2026

Expertise
JavaScriptExpress.jsNode.jsVue.jsETLMySQLThree.jsPythonReact.jsOracle DevelopmentPostgreSQLNginxMicroservices DevelopmentNumPyNoSQL
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-oracle
Worked 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.

Vanguard's Financial Advisor Insights

https://www.adelriosantiago.com/blog/financial-advisor-insights
Developed 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/banksurf
Developed 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

Collaboration That Works

How to Work with Toptal

Toptal matches you directly with global industry experts from our network in hours—not weeks or months.

1

Share your needs

Discuss your requirements and refine your scope in a call with a Toptal domain expert.
2

Choose your talent

Get a short list of expertly matched talent within 24 hours to review, interview, and choose from.
3

Start your risk-free talent trial

Work with your chosen talent on a trial basis for up to two weeks. Pay only if you decide to hire them.

Top talent is in high demand.

Start hiring