Hi There, I'm David Manjarres
I am into
About Me
FULL-STACK DEVELOPER • CLOUD ENGINEER • ECUADOR 🇪🇨
Building scalable, cloud-native applications with ASP.NET Core, NestJS, Spring Boot, and TypeScript — deployed on Azure Container Apps.
Designing RESTful APIs with Clean, Hexagonal & DDD Architecture, implementing CI/CD pipelines, OIDC authentication and multi-tenant SaaS patterns.
Experienced with PostgreSQL, MySQL, MongoDB, Redis — including serverless (Neon) and ORM patterns with Entity Framework Core.
Proficient in containerization (Docker), cloud deployment (Azure Container Apps, ACR, Bicep IaC), message brokers (MassTransit, RabbitMQ) and background jobs (Hangfire).
Automating workflows with self-hosted n8n and AI APIs (Gemini, OpenAI) integrated with Discord, Trello, GitHub, and email.
Software Engineering Degree (2021-2026) at Technical University of Ambato, Ecuador.
Areas of Expertise
Email: davidmanjarres2004@gmail.com
Place:Ambato, Ecuador
Skills & Abilities
Backend Development
Java 
Spring Boot 
Node.js 
Express.js 
NestJS 
Laravel 
.NET / ASP.NET Core 
GraphQL 
Python 
FastAPI 
Odoo 
Scalar 
OpenIddict (OIDC) 
MassTransit 
Hangfire Databases & Cache
PostgreSQL 
MySQL 
MongoDB 
Redis 
SQL Server 
Oracle Frontend Development
React 
Angular 
Next.js React Native 
TypeScript 
JavaScript 
TailwindCSS 
Bootstrap 
Sass 
Figma 
Material UI Cloud & DevOps
AWS 
Azure Azure Container Apps 
Docker 
Kubernetes 
Jenkins 
GitHub Actions 
Git 
Linux 
Postman Azure Bicep (IaC) Message Brokers & Event Streaming
RabbitMQ 
Apache Kafka Automation & AI Integration
n8n 
OpenAPI 
Google Gemini 
Discord API 
Trello API 
Ubuntu Server 
Machine Learning 
Deep Learning 
Playwright 
Selenium 
Stagehand My Education & Certificates
Education is not the learning of facts, but the training of the mind to think.
Universidad Técnica de Ambato
Software Engineering
2021 - Now
During my time at the Universidad Técnica de Ambato, I have gained a solid foundation in software development, including programming, algorithms, and system design. I have also participated in various projects that have honed my problem-solving and teamwork skills.
GraphQL and Node.js: Modern and efficient applications
Udemy - 2024
This course provided me with advanced skills in building modern and efficient applications using GraphQL and Node.js. I learned how to design scalable APIs and integrate them with front-end frameworks.
FullStack and Desktop Programming from ZERO to PROFESSIONAL
Udemy - 2022
In this course, I mastered full-stack development, from front-end technologies like HTML, CSS, and JavaScript to back-end frameworks like Node.js and databases. I also gained experience in desktop application development.
B2 Upper Intermediate
EF SET - 2025
This certification demonstrates my proficiency in English at the B2 level, enabling me to communicate effectively in professional and academic environments.
My Projects
StayFlow Cloud — Multi-Tenant Hotel SaaS
- Multi-tenant: Full row-level tenant isolation with EF Core global query filters and claims-based tenancy.
- OIDC Auth: OpenIddict Authorization Code + PKCE flow with a Next.js BFF, httpOnly session cookies and token refresh.
- Azure Cloud: Deployed on Azure Container Apps with ACR, Bicep IaC, and Neon serverless PostgreSQL.
ASP.NET Core 9 Next.js 16 TypeScript PostgreSQL OpenIddict EF Core 9 Azure Docker MediatR (CQRS) Hangfire 
MassTransit Tailwind CSS
OpenIddict EF Core 9 Azure Docker MediatR (CQRS) Hangfire MassTransit Tailwind CSS 
PetSafe — Veterinary Clinic Management
- Clean architecture: Domain, application, infrastructure and presentation kept apart.
- Real time: Live waiting queue and alerts over WebSockets.
- Clinical core: Records with attachments, drafts, follow-ups and vaccinations.
NestJS Angular TypeScript PostgreSQL Playwright Docker
Playwright Docker 
Iron Zone — Gym Management on Odoo
- Custom addons: Six Iron Zone modules and five invoicing and localization addons.
- Plans: Memberships and periodic invoicing through custom subscriptions.
- Store + portal: Public shop, checkout and a client portal for orders and invoices.
Odoo 18 Python PostgreSQL Docker 
AI Project Manager Bot — n8n Scrumban Automation
- Role: Acts as an AI Project Manager for Scrumban: tasks, blockers, rework, meetings, deliverables, and retrospectives.
- AI Insight: Reads commits & PRs and explains changes in non-technical language, flags technical debt and bad practices with actionable recommendations.
- Integrations: Discord (chat & meetings), Trello board, GitHub (backend/frontend), email alerts, plus a web page to approve/deny PRs.
n8n Gemini Discord Trello GitHub Docker Ubuntu Server 
Fleet & Driver Management Platform
- Architecture: Distributed microservices with NestJS, RabbitMQ, and gRPC.
- Performance: Real-time GPS tracking and reporting for fleet operations.
- Infrastructure: Dockerized environment with Eureka Service Discovery.
NestJS PostgreSQL RabbitMQ gRPC Kubernetes Elasticsearch Kibana Swagger React Docker
E-Commerce Marketplace Platform
- Performance: 85% faster response (300ms → 45ms) via Redis caching and ~70% query reduction.
- Quality: 90% test coverage with Jenkins CI/CD pipeline.
- Cloud: Deployed on Azure Container Apps with Azure Blob Storage for media.
Spring Boot PostgreSQL Redis Swagger React TypeScript TailwindCSS Docker Jenkins Azure
Medical Clinic Management System
- Impact: 60% faster medical record access via 3NF normalization.
- Architecture: Spring Boot backend following Clean Architecture.
- Security: RBAC & JWT authentication for HIPAA compliance.
Spring Boot React Native PostgreSQL Redis Swagger Docker TailwindCSS
Inventory & Audits System
- Compliance: Automated PDF reports for judicial audits.
- Role Management: Custom role-based access for different state entities.
- Stack: Laravel + React with Material UI.
Laravel React MySQL Swagger Material UI
SmartNotes Microservices
- Architecture: Event-driven communication with RabbitMQ.
- Gateway: NGINX API Gateway for routing and auth.
- Database: Hybrid data storage with MongoDB and PostgreSQL.
NestJS RabbitMQ MongoDB Docker
UTA Elections Platform
- Engagement: Real-time stats and news for university stakeholders.
- Design: Responsive UI with Bootstrap and Laravel.
Laravel Bootstrap MySQL
My Creative Portfolio
- Features: Project management and community engagement.
- Tech: PHP, MySQL, and Axios for dynamic interactions.
PHP MySQL JavaScript
Pixel1 Quest
- Concept: Applying SOLID principles to Game Development.
- Patterns: Factory, Strategy, Observer, and Event Bus implementation.
- Tech: Managed state persistence with SQLite.
C# Unity SQLite
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Let's Work Together
I'm always interested in hearing about new projects and opportunities. Whether you need a full-stack solution, backend architecture, or frontend excellence, let's create something amazing together.
4+Years Experience
10+Projects Delivered
12+Backend Services Built
80%Max Test Coverage (E-Commerce)