Alfonso Aguilar
Alfonso Aguilar

Senior Full-Stack Product Engineer

Open to offers · Member since 4 Sep 2026
Message
Location
Guadalajara, Mexico
Desired salary
Unspecified
Work preference
Remote Only / Full Time, Freelance
Experience level
Senior

About

Professional summary

I am a senior full-stack product engineer who builds production business platforms end-to-end. I translate ambiguous business requirements into practical software across frontend, backend, integrations, databases, infrastructure, and operational tooling.

I work with Node.js, TypeScript, Python, Express, FastAPI, Flutter, Vue, React, and Next.js to create web and mobile products. My experience includes authentication, dashboards, role-based access control, API design, and production deployment.

I specialize in CRM-style workflows, including lead pipelines, labels, custom fields, conversations, activities, files, and account-scoped permissions. I design relational data models and backend contracts that support reliable business operations.

I have built WhatsApp and Meta-integrated systems with webhooks, message persistence, WebSocket updates, human handoff, automation controls, media handling, and authoritative message status flows. I also develop AI assistant behavior using LLM tool calling, RAG knowledge bases, deterministic commands, and conversation-aware workflows.

My background includes finance, real estate, fitness, healthcare, pensions, credit, customer service, and trading platforms. I lead full delivery cycles from requirements and architecture through implementation, testing, deployment, maintenance, and client communication.

I am a native Spanish speaker with professional English proficiency and working knowledge of Portuguese, French, and German. I am based in Guadalajara, Mexico, and have delivered freelance projects remotely.

Skills

25 capabilities

Tech stack & tools

Working toolkit

Experience

Career history

Freelance Lead Developer / Product Engineer Sfera Digital

I own architecture and implementation for business applications across finance, real estate, fitness, pensions, credit, customer service, and CRM automation. I build multi-platform products using Flutter, Vue, React, Node.js, and FastAPI, including authentication, dashboards, role-based access, APIs, and production deployments.

I design CRM-oriented data models and workflows for leads, pipeline stages, conversations, activities, files, permissions, and automation. I lead requirements, architecture, implementation, testing, deployment, issue resolution, and client communication, including WhatsApp/Meta and AI assistant integrations.

Freelance Lead Developer Briyam

I develop a customer-service and business-knowledge platform using Vue, Node.js, WhatsApp patterns, and LLM-based assistant behavior. The platform supports conversation-aware responses and business data interpretation.

I designed backend architecture for chat sessions, messages, knowledge entries, LLM requests, assistant orchestration, and tools. I also implemented messaging utilities for media, typing indicators, flows, and user interactions.

Freelance Lead Developer PensionGuru

I built a multi-platform pension calculation application using Flutter and Node.js for Android, iOS, and web. The product supported pension studies and calculation-heavy business workflows.

I implemented backend APIs and user interfaces for structured data capture, validation, and report-oriented processes. I delivered a production-oriented architecture that supported complex domain logic through a client-facing interface.

Freelance Lead Developer Clickavit

I developed a multi-platform personal credit application using Flutter and Node.js. The application supported customer data gathering, credit-related workflows, and CRM integration.

I implemented backend APIs for request tracking, data capture, validation, and administrative review. I delivered mobile and web experiences together with operational dashboards for business users.

Freelance Lead Developer AFIE

I developed a real estate web platform using Vue, Node.js, and PHP. The platform included CRM dashboards and organizational tools for real estate operations.

I created custom document-signature and workflow capabilities tailored to client processes. I also maintained and extended existing frontend and backend code while delivering new product functionality.

Freelance Lead Developer XpertsFit

I built a fitness and coaching platform using Flutter and FastAPI. The cross-platform product supported athletes, coaches, routines, programs, and performance monitoring.

I implemented backend APIs for routine management, user data, and operational workflows. I delivered integrated frontend features for mobile and web with production backend connectivity.

Freelance Lead Developer CornerCare

I developed a healthcare and provider-management web platform using Flutter and FastAPI. The product supported appointment, personnel, and service-management workflows.

I implemented backend and frontend capabilities for operational scheduling and user management. The solution focused on practical healthcare business operations and administrative workflows.

Chief Technology Officer Broker Aurea Capital Markets

I led technology for a multi-platform financial trading system using Python, Flutter, MQL, and Java. I worked across mobile, web, and backend components for trading-sector workflows and dashboards.

I coordinated technical delivery and architecture decisions across a small team. My work included market-data-oriented functionality and operational tooling for the trading platform.

Software Developer / Technical Lead Eximia Derivative Solutions

I designed and implemented software architecture for an options, futures, and swaps trading platform using Python and MySQL. I developed financial workflows, risk-management tools, trader dashboards, and market-data integration concepts.

I managed delivery with a small development team while owning core architecture and implementation. I contributed both hands-on engineering work and technical leadership for the platform.

Education

Learning history

ITESO - Western Institute of Technology and Higher Education

Bachelor's Degree, Financial Engineering

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