Gonzalo Simón Aguilar

Professional experience

Responsibilities, engineering contributions and outcomes from my full-stack roles and client engagements. Figo, Norden, Playboy and Martin Marietta were client projects delivered through ArkusNexus.

1. Áureo & Mayor

   Founder & Software Engineer

   Nov 2025 - Present

   Building an enterprise document-encryption platform that brings cryptographic functionality, a full-stack product interface and persistent data into a shared application architecture.

   • Document-encryption architecture

     Architected a system for sensitive enterprise documents using Python and TypeScript, implementing RSA for asymmetric cryptography and AES-256 for symmetric cryptography. My responsibility connects the encryption design with the application that exposes it to users.

   • Full-stack product development

     Built the platform as a TypeScript and Next.js monorepo, with React and Tailwind CSS for the interface. The work spans product structure and application implementation within a codebase designed for continued development.

   • Persistence and automated checks

     Used PostgreSQL with Drizzle ORM for data persistence and Vitest for automated testing, bringing database access and verification into the product architecture.

   • AI and language-model features

     Developed AI- and large-language-model-powered capabilities as part of the platform.

   Contribution and outcome. Established the encryption design and full-stack foundation of a product under active development.

   • Python
   • TypeScript
   • Next.js
   • React
   • PostgreSQL
   • Drizzle ORM
   • Vitest

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2. PAGOS360

   Full-Stack Engineer

   Oct 2023 - Nov 2025

   Worked across front-end and backend teams: led the customer platform architecture and implementation, engineered CORE–DynamoDB data synchronisation and SQS batch processing, improved IIBB tax recalculation, and developed CORE account-metadata APIs with automated verification.

   • TypeScript
   • Next.js
   • React.js
   • DynamoDB
   • AWS SQS
   • REST APIs

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3. ArkusNexus · Client engagement

   Figo Pet Insurance

   Front-End Engineer

   November, 2022 - October, 2023

   Developed React and React Native insurance applications through ArkusNexus, supporting direct-to-consumer and enterprise sales. My work combined interface delivery, API integration, performance optimisation and accessibility.

   • Web and mobile interfaces

     Developed and maintained application interfaces in React and React Native for two sales contexts: direct-to-consumer and enterprise. This involved working with the behaviour and data requirements of the products as well as their presentation.

   • Performance optimisation

     Applied memoisation and custom data-fetching patterns to improve application loading. This work produced the 25% load-time reduction reported in my résumé.

   • Reusable hooks and API integration

     Built reusable hooks for form state and caching, and integrated the applications with REST APIs. These abstractions gave repeated interactions and data access a common implementation across the features that used them.

   • Accessible user interactions

     Implemented semantic HTML and ARIA for web interfaces and screen-reader support across relevant experiences. The focus was on making controls and user flows usable with assistive technology, alongside the visual interface.

   Contribution and outcome. Delivered accessible web and mobile product work and reusable application hooks, with a reported 25% reduction in load times through memoisation and data-fetching improvements.

   • React Native
   • React.js
   • Redux
   • Accessibility

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4. ArkusNexus · Client engagement

   Norden Mind Group

   Full-Stack Engineer

   July, 2022 - November, 2022

   Built an employee-management platform through ArkusNexus and contributed to a shared component library used by seven development teams. My role covered interface development, API work and relational data modelling.

   • Employee platform from the ground up

     Built the employee-management application using TypeScript and Next.js. The work established the product interface and connected employee information with the services and database behind it.

   • API design and backend implementation

     Contributed to REST API design and the Node.js backend, working with the backend team to connect the application to its endpoints. My contribution crossed the interface and service boundary.

   • PostgreSQL data modelling

     Designed PostgreSQL schemas for employee data. This brought the structure of the stored information into the same delivery effort as the application and its API contracts.

   • Shared component library

     Contributed reusable components to a library used by seven development teams, supporting consistency and reuse across their products.

   Contribution and outcome. Delivered the employee platform across interface, API and data layers, while contributing to a component library adopted by seven teams.

   • TypeScript
   • Next.js
   • React.js
   • Node.js
   • PostgreSQL

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5. ArkusNexus · Client engagement

   Playboy Group Inc

   Back-End Engineer

   February, 2022 - July, 2022

   Built a Node.js data-repair pipeline for a legacy dataset covering 40,000+ films, reducing repair runtime from 160 to 20 minutes. Also developed React and C#/.NET employee platform features and maintained SQL Server data.

   • Node.js
   • C#/.NET
   • React.js
   • PostgreSQL
   • SQL Server

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6. ArkusNexus · Client engagement

   Martin Marietta

   Full-Stack Engineer

   September, 2021 - February, 2022

   Developed a business intelligence platform through ArkusNexus, connecting a TypeScript and React interface with Node.js services and MongoDB data models for aggregation and analytics.

   • Full-stack business intelligence platform

     Built the React and TypeScript front end and worked on the Node.js backend. My contribution connected the user-facing analytical interface with the services supplying its information.

   • Authentication and service integration

     Implemented JWT authentication and integrated the application with REST APIs, bringing authenticated access and backend communication into the platform.

   • MongoDB models and aggregation

     Designed MongoDB data models to support flexible aggregation and analytics.

   • Responsive data visualisation

     Built responsive visualisations and shaped the interface using Material UI and Tailwind CSS. This work made the analytical information usable across screen sizes while keeping it connected to the underlying data services.

   Contribution and outcome. Delivered a connected business intelligence application spanning interface, authentication, backend integration and analytical data models.

   • React.js
   • MongoDB
   • Node.js
   • TypeScript

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7. Vaster

   Full-Stack Engineer

   April, 2021 - September, 2021

   Contributed to a hospital-management platform using React, Angular, JavaScript and Node.js, with a focus on reusable forms, data manipulation and connected application state.

   • Hospital-platform development

     Worked within an existing healthcare application, contributing to its interface and application behaviour across React and Angular code. The engagement involved maintaining connected workflows rather than building isolated pages.

   • Reusable form components

     Designed reusable forms so repeated interface behaviour could be maintained in shared components. This placed form construction and reuse within the application development work.

   • Data manipulation and state

     Worked on data manipulation and complex state interactions, helping related parts of the interface remain consistent as users moved through the product.

   Contribution and outcome. Contributed reusable forms and application-state improvements to the hospital platform.

   • React.js
   • JavaScript
   • Node.js
   • Angular

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8. Freelance

   Full-Stack Engineer

   December, 2019 - April, 2021

   Delivered features and maintenance work for client e-commerce products and web and mobile applications, adapting to existing codebases and changing requirements.

   • Client product development

     Worked on e-commerce projects and web and mobile applications, using React and Next.js alongside backend technologies including Node.js, Python and MongoDB across the engagements.

   • Bug diagnosis and maintenance

     Investigated application defects and implemented fixes in existing products. This work required understanding each codebase and the behaviour the client expected before changing it.

   • Feature delivery across the stack

     Added requested functionality and worked across interface and backend concerns as project needs evolved, keeping changes focused on the client’s requirements.

   Contribution and outcome. Delivered requested fixes and features across several client projects, building practical experience in product maintenance and full-stack implementation.

   • Next.js
   • React.js
   • Python
   • Node.js

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