Christian Melgarejo Senior Software Developer since 2004

Project: Heal.me

Full-stack engineer at Heal.me, the platform that helps wellness practitioners run their practice: booking, payments, client management, and custom websites. I own features end to end across Rails, React/TypeScript, and GraphQL, and I handle deployments, production operations, and the third-party integrations that keep the product moving (payments, calendars, messaging, and more). I use AI tools every day, including modern agent frameworks, to ship faster without giving up quality.

Technologies

• Ruby on Rails
• React
• TypeScript
• GraphQL
• PostgreSQL
• Redis

Project: LawOS — mendozafirm.tramcase.com

I contributed to TramCase, a multi-tenant legal case-management platform with RBAC, a client portal, and telephony integrations. I built features with Django, PostgreSQL, and React, focusing on tenant isolation, automated testing, and AI tooling.

Technologies

• Python
• ReactJS
• PostgreSQL
• AWS

Project: Joguapp

I built Node.js and Go services for an e-commerce product. They connect a mobile app, a back office for posts, users, and in-app messages, and a ReactJS frontend for those interactions.

Technologies

• Go
• NodeJS
• NestJS
• ReactJS
• NextJS
• HTML/CSS
• Typescript/Javascript
• MySQL
• DigitalOcean

Project: GameOn Live Fantasy — gameon.app

• Built and maintained Go and Python APIs and microservices.
• Architected new and existing features for the live fantasy app and back office.
• Implemented new third-party API integrations.

Technologies

• Go
• NodeJS
• NestJS
• ReactJS
• NextJS
• HTML/CSS
• Typescript/Javascript
• MySQL
• DigitalOcean
• AWS

Project: Digit Mint

• Contributed to the development of our advanced platform, supporting DMA (Double Materiality Assessment), LCA (Life Cycle Assessment), and ESRS/CSRD (European Sustainability Reporting Standards / Corporate Sustainability Reporting Directive - CSRD).
• Architected new features and implementations.
• Ran DevOps on Google Cloud Platform.

Technologies

• Go
• NodeJS
• Typescript/Javascript
• PostgreSQL
• GCP

Project: CoughPro Insights Dashboard — hyfe.ai

• Built a Next.js dashboard with charts and custom components for the cough data captured by the app. The app uses an ML model to detect different types of coughs.
• Created APIs and third-party integrations with Go microservices.

Technologies

• NodeJS
• NextJS
• ReactJS
• HTML/CSS
• D3.js
• Go

Project: Cuely

• Built a Go service for a wellbeing product with game mechanics, integrated with Slack and Microsoft Teams.
• Built a ReactJS web app to manage interactions, configure options, and view reports.

Technologies

• Go
• ReactJS
• NextJS
• HTML/CSS
• Javascript
• PostgreSQL

Project: Developer Portal (Backend and Frontend) — tyk.io/docs/tyk-developer-portal

• Developed internal and client-facing tools for the open-source gateway, including a web portal to manage identity providers (IdP) and gateway interactions. tyk.io
• Helped develop and integrate microservices and first- and third-party external services.
• Extended and developed the open-source CMS QOR. getqor.com

Technologies

• Go
• HTML/CSS
• Javascript
• PostgreSQL
• MySQL
• SQLite

Project: Addinex System (backend to frontend, including some React Native app features)

I led architecture and design, backend and frontend, for the Addinex patented low-cost medicine dispenser, built to prevent prescription-drug misuse through:

• password-protected dosage access
• real-time patient education and excess medication destruction
• data feedback on actual usage patterns.

Technologies

• NodeJS
• NestJS
• ReactJS
• NextJS
• HTML/CSS
• PostgreSQL

Project: AccessIntegra Backend and Portal

I handled backend development, the database and data models, first- and third-party API integrations, several microservices, test-driven development, and production deployment.

Technologies

• Go
• OpenAPI Spec
• Apache Kafka
• PostgreSQL

Project: OCM Portal | OCM website

I designed the architecture, database, and data models, ran ETL from legacy systems, and integrated first- and third-party APIs. I led the back-office services team and moved the client-facing site from ASP.NET MVC to a Go backend and a ReactJS frontend.

Technologies

• Go
• ReactJS
• gqlgen
• HTML/CSS
• PostgreSQL
• MySQL

Project: UTU.ai portal - Machine Learning Marketplace — utu.ai

In charge of the frontend development of the marketplace, connection to 1st and 3rd party APIs.

Technologies

• Go
• ReactJS
• gqlgen
• PostgreSQL
• MySQL
• BigTable

Project: Workbox invoice and payment platform — workbox.company

I worked on the frontend of the Workbox time tracker and invoicing app, and I integrated the backend microservices.

Technologies

• Node.js
• React.js
• HTML/CSS
• GraphQL
• PostgreSQL

Project: Nexoos Paraguay — nexoos.com.py | nexoos.com.br

Nexoos is a fintech platform that helps small and medium-sized businesses raise funds at lower interest rates than banks and brokerage houses. I integrated third-party APIs and worked in Ruby on Rails on the Nexoos system.

Technologies

• Ruby on Rails
• HTML/CSS
• Javascript
• Scala
• PostgreSQL

Project: Edge Mobile Ideas Gateway — edgeamg.com/platform

A telecommunications operator's data center and SMS gateway. It handles subscriptions and purchases across channels, and charges users for content, among other operations. I built Windows Server services that sync data over SMPP with the carrier and the content providers, and I was the lead developer for the .NET work and the small mobile apps.

Technologies

• .NET
• C#
• Javascript
• Elixir
• Android
• iOS
• HTML/CSS
• MSSQLServer
• PostgreSQL

Project: Personal S.A. Website and VAS services — personal.com.py

Full-stack development, research, and maintenance of VAS (Value Added Services) for Telecom Personal NUCLEO S.A., from USSD menus and interactions to first- and third-party API integrations.

Technologies

• .NET
• C#
• Javascript
• HTML/CSS
• MSSQLServer
• PostgreSQL

Project: AVL system and website — rastreo.com.py

Development of the fleet management web application, integration with diverse GPS and car alarm units.

Technologies

• .NET
• C#
• Javascript
• HTML/CSS
• MSSQLServer
• PostgreSQL

Project: Smart city systems integration — noa-group.net/smart-city

At NOA Investment & International trade I worked on a smart-city project for Puerto Cortés, Honduras. It integrated and centralized software connecting CCTV cameras, security systems, criminal AFIS, and the AVL system.

Technologies

• .NET
• C#
• C++
• Javascript
• HTML/CSS
• MSSQLServer
• PostgreSQL

Project: AVL system and website — cusat.com.py

Development of the fleet management web application, integration with diverse GPS units and integration of Telecom SMS system for triangulation and location of vehicles.

Technologies

• .NET
• C#
• Javascript
• HTML/CSS
• MSSQLServer
• PostgreSQL

Project: Developer Portal (Backend processes) — tyk.io/docs/tyk-developer-portal

• Improved the web portal that manages identity providers (IdP) and tyk.io gateway interactions.
• Integrated microservices and first- and third-party external services.

Technologies

• Go
• HTML/CSS
• Javascript
• PostgreSQL
• MySQL
• SQLite

Project: Addinex System (Backend extensions)

• Extending and maintaining the schemas of the system
• Engaging on DevOps tasks, deployment and monitoring systems

Technologies

• NodeJS
• NestJS
• PostgreSQL

Project: PSI Services

Technology Consultant developing backend services in Go, developing and extending current APIs for services provided in the platform, specifically for AWS.

Technologies

• Go
• NATS
• MongoDB
• MySQL
• PostgreSQL

Past personal project: Loogistico

• Loogistico is a door-to-door delivery and package-handling company. Each of our delivery agents is trained to provide the best experience on every service.
• Technology Consultant in package management and door-to-door delivery application services and website.

Technologies

• PHP
• Go
• NodeJS
• HTML/CSS
• Javascript
• MySQL
• PostgreSQL

A bounded, observable, and optionally adaptive object pool for Go with strict idle-object retention limits, runtime tuning, and detailed metrics.

A lightweight internationalization message catalog for Go APIs and error handling, with YAML catalogs, context-based language resolution, named templates, and localized error wrapping.

A Go package for converting strings between snake_case, kebab-case, CamelCase, lowerCamelCase, and custom delimited formats.

A Go package for validating email format, checking domain validity, and testing whether a mailbox host recognizes a user.

A platform that organizes stock with QR codes. Each code stores categories, geolocation, and files such as manuals, pictures, and schematics for telecom, gas, and water companies.

Checkpoint times check-ins and attaches a prepared set of activities and notes to each one. Teams use it for medical visits, pre-sales, sales, and technical repairs. A trainer can also record a training activity, the people in it, and the course or area.

Control a GPS from your phone without a monthly monitoring fee. GPSManager loads the device and vehicle data for a GPS TK103 (also called GPS103-A or GPS103-B) or a GPS OBD-II unit (AutoGeneral OT08 or GPS306A).

An opinionated GraphQL server made with Go