Rolando Javier Toledo

Full Stack Developer

Building digital experiences with modern technologies

About Me

Personal Info

I'm a Highly skilled Senior Full Stack Developer with over 10 years of experience in designing, developing, and optimizing web applications. Adept at leading development teams, implementing scalable solutions, and driving innovation across frontend, backend, and DevOps technologies. Proven track record of enhancing system performance, reducing costs, and delivering high-quality software that drives business growth. Passionate about adopting new technologies, improving development workflows, and ensuring security best practices. Committed to delivering seamless, user-friendly, and high-performance web applications.

Location:Buenos Aires, Argentina

Education

Bachelor’s Degree in Computer Science

University of Buenos Aires

2010 - 2015 | Buenos Aires, Argentina

35+
Project completed
100%
Satisfaction of customers
27000+
Development Hours
750k+
Total Earning

Experience

Senior Software Developer

Simform

08/2022 – Present | Orlando, United States

  • Led the development of a high-traffic e-commerce platform, improving page load times by 45%, leading to an 18% increase in conversions.
  • Optimized database queries and caching strategies, reducing server costs by 30% and improving system response time by 50%.
  • Spearheaded the migration of a monolithic system to a microservices architecture, resulting in a 40% improvement in scalability and a 25% reduction in downtime.
  • Integrated CI/CD pipelines, cutting deployment time from 6 hours to 30 minutes and reducing production errors by 60%.
  • Led a team of 10 developers, mentoring junior engineers and increasing team productivity by 35%.
  • Developed and maintained RESTful and GraphQL APIs, handling over 5 million requests daily.
  • Implemented an AI-powered recommendation engine that boosted user engagement by 22%.
  • Enhanced application security, reducing vulnerabilities by 70% through rigorous security audits and best practices.

Software Developer

Vantek

01/2020 – 07/2022 | Buenos Aires, Argentina

  • Designed and developed a SaaS CRM system, increasing client retention by 28% and contributing to an additional $2.5M in annual revenue.
  • Implemented advanced caching mechanisms, reducing API response times by 55% and improving user experience.
  • Built an automated reporting dashboard, cutting down manual reporting time from 8 hours to 15 minutes per report.
  • Integrated third-party payment solutions, leading to a 40% increase in transaction success rates.
  • Refactored legacy PHP codebase to a modern Node.js and React architecture, improving maintainability and reducing bug reports by 50%.
  • Developed a scalable notification system that handled over 1 million push notifications per day.
  • Deployed machine learning models to analyze customer behavior, resulting in a 20% improvement in targeted marketing campaigns.
  • Led the adoption of Agile methodologies, increasing sprint efficiency by 30%.

Software Developer

SIDOM

01/2016 – 12/2019 | Buenos Aires, Argentina

  • Developed a multi-tenant SaaS application that scaled to 200K+ users, driving an additional $1.8M in revenue.
  • Re-architected a large-scale legacy system, reducing server costs by 35% and improving performance by 50%.
  • Designed and implemented a role-based access control (RBAC) system, improving data security and compliance.
  • Built a real-time analytics dashboard for a marketing agency, providing actionable insights and boosting campaign effectiveness by 25%.
  • Automated deployment processes, reducing deployment failures by 80% and accelerating feature releases.
  • Integrated an AI chatbot, reducing customer support costs by 30% while maintaining a 95% customer satisfaction rate.
  • Led a frontend modernization project, transitioning from jQuery to React, improving UI performance by 40%.
  • Contributed to an open-source project that received 500+ stars on GitHub and improved internal developer adoption.

Skills & Expertise

Programming Languages

C++ / C#0%
Python0%
JavaScript / TypeScript0%
PHP0%
Java0%
Ruby0%

Frontend

React / Next.js0%
Vue / Nuxt.js0%
Angular0%
Tailwind CSS / Bootstrap / Material-UI0%
Three.js / D3.js / Chart.js0%

Backend

Node.js / Nest.js0%
Laravel0%
Flask / Django / FastAPI0%
Spring Boot0%
ASP.net0%
Ruby on Rails0%

Database

MySQL0%
PostgreSQL0%
MongoDB0%
Redis0%

Cloud Services

AWS0%
GCP0%
Azure0%

DevOps

Docker0%
Kubernetes0%
GitHub Actions0%

Others

Agile(Scrum/Kanban)0%
AI/LLM0%
BlockChain0%

Featured Projects

Flower Delivering Site

Flower Delivering Site

A full-stack e-commerce solution built with Next.js, featuring user authentication, payment processing, and admin dashboard.

Next.js
Django
Stripe
PostgreSQL
Tailwind CSS
Insurance & Financial Service

Insurance & Financial Service

A modern insurance website offering policy information, quote requests, claims management, and customer support through an intuitive and secure platform.

React
Node.js
Socket.io
MongoDB
Material-UI
Fitness Club Surrey
Featured

Fitness Club Surrey

A fitness club website featuring class schedules, membership sign-ups, personal training services, and member resources to promote a healthy lifestyle.

Vue.js
Laravel
PostgreSQL
Tailwind CSS
AWS
Women's Clothing | Fashion Online
Featured

Women's Clothing | Fashion Online

An elegant online fashion store offering women's clothing, accessories, and footwear with the latest trends and styles for every occasion.

React
FastAPI
PostgreSQL
Material-UI
Stripe
Featured

Lake Norman Homes for Sale

A real estate website showcasing Lake Norman homes for sale, with property listings, virtual tours, and resources for buyers and sellers.

Angular
Spring Boot
MongoDB
Redis
GCP
Online Gambling (Casino)

Online Gambling (Casino)

An engaging online casino platform offering a variety of games, including slots, poker, and table games, with secure transactions and real-time gameplay.

Nuxt.js
Smart Contract
Tailwind CSS
Web3.js
Conversational AI Agents
Featured

Conversational AI Agents

AI chatbot solution designed to assist business owners with customer support, and operational tasks through seamless, natural conversations.

Next.js
Express.js
AI/LLM
LangChain
Pinecone
Men's & Women's Clothing, Beach & Home

Men's & Women's Clothing, Beach & Home

A lifestyle store offering stylish men's and women's apparel, beachwear, and home decor for a relaxed and trendy lifestyle.

Angular
Spring Boot
MySQL
Tailwind CSS
AWS
Elegant Diamonds & Luxury Jewelry
Featured

Elegant Diamonds & Luxury Jewelry

A luxurious jewelry collection featuring diamonds, engagement rings, and high-end accessories crafted for elegance and special occasions.

Vue.js
Nest.js
MongoDB
Material-UI
GCP

Get In Touch

I'm always open to discussing new opportunities and interesting projects. Let's connect and create something amazing together!

Location

Buenos Aires, Argentina