Juan Martin
Canguillen
Backend Software Engineer
I architect scalable server-side systems and robust data pipelines. My expertise lies in NestJS, LLM, Next.js with React, TypeScript, System Design, and Software Architecture.
With a semi-senior background and +4 years of experience, I combine technical autonomy with a product-driven mindset, bridging the gap between business logic and efficient database architecture.
Technical Expertise
I specialize in robust backend systems. My toolkit is built around reliable, scalable, and maintainable technologies.
AI & Automation
Backend Frameworks
Frontend & Tools
Data & NoSQL
Programming Languages
DevOps & Infrastructure
Electronics
Mathematics & Science
Social Sciences, Economics & Finance
Engineering Journey
Software Engineer
Full-time engineer designing end-to-end a batch working engine that processes millions of leads daily, with scalable microservices and AI-powered workflow automation.
Key Achievements
- Designed end to end a batch working engine that works with tons of data daily through millions of leads.
- Architected and deployed scalable microservices using Node.js, NestJS, and PostgreSQL, increasing system throughput by 35% and reducing API response times across high-traffic production environments.
- Integrated AI-powered capabilities and custom RAG architectures using OpenAI and Anthropic APIs, automating complex workflow data extraction and boosting end-user task efficiency by 40%.
- Developed responsive frontend applications with Vue.js, TypeScript, and Material UI, improving user interface performance and reducing page load times by 25%.
- Utilized Docker, AWS, and GitHub Actions in daily development and deployment workflows to maintain smooth continuous integration and environment consistency.
Software Engineer Intern
Owned the end-to-end technical execution of a standalone MVP in an Agile team, from requirements gathering through production deployment.
Key Achievements
- Owned the end-to-end technical execution of a standalone MVP software project from initial requirements gathering to final deployment in an Agile environment.
- Collaborated with UX/UI designers and product stakeholders to translate functional specifications into scalable application architecture, delivering the product 2 weeks ahead of schedule.
- Enforced strict code quality standards through peer code reviews and automated unit testing, achieving 95%+ test coverage and delivering comprehensive production-ready documentation.
Full Stack Web Developer
Designed, built, and deployed custom full-stack web solutions for multiple clients, including a real-time auction platform with high-concurrency bidding.
Key Achievements
- Designed, built, and deployed custom full-stack web solutions, including a real-time auction platform supporting high-concurrency bidding operations.
- Developed secure RESTful APIs and user authentication logic using Django, Python, NestJS, and PostgreSQL, consistently achieving sub-100ms backend response times.
- Delivered 10+ responsive client applications with Next.js, React, and modern JavaScript, meeting end-to-end technical requirements on schedule.
Academic Background
Universidad Empresarial 'Siglo 21'
Focus on scalable software architectures, cloud computing strategies, and agile project management for enterprise environments.
Universidad Tecnológica Nacional
Information Systems Engineering focuses on designing, implementing, organizing, and managing the information systems required by public and private organizations. It combines knowledge of mathematics, programming, data management, software, hardware, and networks.
Nuestra Señora De Luján
Developed strong analytical foundations, critical thinking, and communication skills essential for effective stakeholder management and team leadership.
Licenses & Certifications
Databases and SQL
TodoCode
Comprehensive review to strengthen core foundations in relational algebra and SQL/PLSQL.
JavaScript with NodeJS
Udemy
Generative AI Core Foundations
Microsoft
Foundation C# With Microsoft
Microsoft
#ICanCode JA
Junior Achievement Argentina
C Language From Zero To Expert
Udemy
Plan Your Future - JA
Junior Achievement Argentina
Certification in Ruby and JS: 'Sé Programar'
Mumuki / Argentina Programa
#Socios2021 Apprenticeship
Junior Achievement Argentina
Global Mindset
My international experience and multilingual proficiency enable me to seamlessly integrate into diverse, global engineering teams.
Languages
Cultural Adaptability
Proven ability to thrive in fast-paced international environments in the US, handling diverse customer interactions with resilience.
Work & Travel USA Experience
Beach Attendant
1 Hotels | Miami, FLProvided premium service in a high-end hospitality environment. Refined English communication skills through constant interaction with international guests and effectively solving on-site issues.
Beach Attendant & Cashier
Boucher Brothers Management | Miami Beach, FLHandled fast-paced transactions and logistics in a high-volume tourist area. Developed situational leadership and cash handling procedures while collaborating with a multicultural team.
Selected Work
A selection of projects that demonstrate my ability to solve complex engineering problems and deliver high-quality products.
Dental Clinic Platform
A comprehensive landing page for a dental practice featuring interactive treatment modals, location services, and patient FAQs.
- •Designed a clean, trustworthy UI with accessible navigation.
- •Implemented custom modals for detailed procedure information.
- •Integrated location services and responsive FAQ sections.
Mundo Figus Store
Full-stack SEO-first e-commerce platform built end-to-end with ownership across architecture, backend, frontend, data model, infrastructure, and deployment.
- •Built a production-grade architecture with SSR storefront, REST APIs, auth, admin roles, and transactional workflows.
- •Implemented SEO-driven product pages, metadata strategy, and performance optimization for organic acquisition.
- •Deployed and operated the platform on private VPS infrastructure with containers, Nginx, and automated releases.
Real-Time Auction Platform
A backend-driven real-time auction system leveraging Django Channels for instant bidirectional WebSocket communication.
- •Architected a robust WebSocket layer using Django Channels for sub-second updates.
- •Implemented complex bidding logic with purely backend-managed state.
- •Containerized the complete ecosystem using Docker for scalable production deployment.
Enterprise Analytics Dashboard
Ticket Management System with responsive data grids and comprehensive admin panels.
- •Virtualized data grids for performance.
- •Completely responsive UI for mobile administration.
- •Integrated with complex backend ETL pipelines.
Portfolio & Client Sites
High-performance marketing sites and personal portfolio with focus on SEO and Vital metrics.
- •Lighthouse scores > 90 across all metrics.
- •Fully accessible and responsive designs.
- •Automated CI/CD pipelines via GitHub Actions.