Web Development & Websites
Responsive websites, landing pages and web applications built with Angular, React and TypeScript, optimized for speed and search engines.
HELLO, I'M
Angel AlvarezSenior Software Engineer & Freelance Full-Stack Developer
I design and build websites, web applications, APIs and cloud-native systems for startups and companies. Available for freelance projects worldwide.
Technical Expertise
Technologies I work with
Backend & Cloud
Building scalable serverless architectures and distributed systems
Frontend & Mobile
Creating responsive and interactive user experiences
DevOps & IaC
Automating infrastructure and deployment pipelines
Architecture & Design
Designing robust and maintainable systems
Building Since 2020
Working with companies across
United States
Chile
Honduras
El Salvador
Specializing in scalable backend systems, real-time applications, and cloud-native architectures that solve complex technical challenges.
Performance Engineering
Achieved 96% improvement in bulk data processing (24h → 30min for 50K records). Optimized database queries reducing response times by 70%.
Real-Time Systems
Architected WebSocket-based notification systems serving thousands of concurrent users. Built event-driven architectures with AWS SNS/SQS.
High-Throughput Platforms
Designed REST APIs processing 100K+ daily transactions. Built microservices handling millions in transaction volume for fintech platforms.
Secure Infrastructure
Developed government-grade security systems with regulatory compliance. Built national infrastructure software with high availability requirements.
Multi-Channel Integrations
Integrated WhatsApp Business API, Facebook, and Instagram into unified platforms. Built third-party API connectors for SaaS applications.
Aerospace & Research
Contributed to satellite flight software development. Implemented real-time data processing for orbital mechanics and telemetry systems.
Software Engineering Services
Freelance web, backend and cloud development for startups and companies
Backend & API Development
Secure, scalable REST APIs and microservices with Node.js, NestJS and Python, backed by PostgreSQL and DynamoDB.
Cloud & AWS Architecture
Serverless and event-driven architectures on AWS Lambda, SNS/SQS and CloudFormation, deployed through CI/CD pipelines.
Integrations & Automation
WhatsApp Business API, Facebook and Instagram integrations, third-party API connectors and workflow automation for SaaS products.
Real-Time Systems
WebSocket-based notifications, live dashboards and high-throughput data processing for thousands of concurrent users.
Performance & Technical Consulting
Code reviews, query and pipeline optimization, system design and technical guidance to make your software faster and more reliable.
Key Achievements
Impact delivered
96% faster
Performance Optimization
Reduced bulk data processing from 24 hours to 30 minutes
100K+ daily
High-Throughput Systems
Built fintech infrastructure handling hundreds of thousands of transactions
1000s users
Real-Time Scale
Designed notification system serving thousands of concurrent users
3 platforms
Multi-Channel Integration
Connected WhatsApp, Facebook, and Instagram to unified interface
Frequently Asked Questions
What to know before we work together
Are you available for freelance and remote projects?
Yes. I take on freelance and contract software projects remotely and have worked with companies from the United States, Chile, Honduras and El Salvador.
What kind of software do you build?
Websites, web applications, REST APIs, microservices, cloud-native backends, real-time systems and integrations such as WhatsApp Business API, Facebook and Instagram.
Which technologies do you use?
Angular, React, Ionic, TypeScript, Node.js, NestJS, Python, PostgreSQL, DynamoDB, AWS (Lambda, SNS, SQS, CloudFormation), Docker and CI/CD with GitHub Actions.
How can I hire you or ask for a quote?
Send me an email or a WhatsApp message with a short description of your project, and we will discuss scope, timeline and budget.
Do you work in English and Spanish?
Yes. I communicate with clients and deliver documentation in both English and Spanish.
Can you improve or scale an existing application?
Yes. I have cut bulk data processing from 24 hours to 30 minutes and reduced query response times by 70%, and I can audit and improve existing systems.
Let's Build Something Together
I'm always open to discussing new projects and opportunities