Jhonny El Helou

A C# based multi-tenant application that allows clients to customize deployment commands, triggers, and steps. The project was built for secure machines and DMZs that did not want to expose or open ports to the public. The solution was to expose RabbitMQ ports to securely send messages between gateways (APIs) and services (agents). The application stores sensitive client information (applicative machines, database machines, and credentials) encrypted in the client's infrastructure and never used or passed through the networks (IDs are instead used to point to sensitive information). Clients can also change scripts stored on their infrastructure and can be written in Bash, Windows PowerShell, or Python. I was the application's back- and front-end developer and used the below technologies to implement the project.

A cross-platform time tracking application that aims to automatically track user time and eventually compute time spent per project. The client that can be used to compare the monthly cost to revenue. The first part of the application consists of a .NET REST API to manage users, teams, salaries, clients, revenues, departments, and activities. Then comes the front end, where we can manage the resources, filter user data, generate reports, and export data. Last is the reminder tool that is installed on client machines as a reminder to use the tool and automatically fill from previous activities

A C# based multi-tenant application that connects to multiple exchanges and providers and acts as a single page portfolio management system. The project was designed in a domain-driven approach with five microservices in mind: Security, RateLimit (client/IP rules), PMS (financial data and calculations), DataExtract (data retrieval such as API calls, WebSockets, SFTP upload, SFTP download, ZIP and UNZIP requests, email attachments download, Dynamic ETL (extract, transform, load) requests), pricing (pricing configurations, provider pricings) and audit (tracking versioning of data stored, restore to the previous version). Each microservice is in its own repository and managing its corresponding components (API, databases, and services), where each service is responsible for resolving a specific business problem. Service-to-service communication is performed via RabbitMQ requests that wait until the execution of the operation or normal fire-and-forget events via API and calls.

An Excel-based plugin for spot/margin/future trade monitoring. I was the leading developer working on creating the plugin, storing client configuration (selected exchanges, selected instruments, and refresh rate), implementing WebSocket connections to exchanges, checking log files, and generating deployable solutions. The application is useful for comparing bid and ask prices for each instrument and exchange.

A C++ based application aimed to abstract the termination logic for any algorithm into a configuration. It allows validation on a single termination as well as a combination of multiple terminations at the same time. It implements fitness and stagnation functions, time, threshold, iteration, and resources (RAM, thread) constraints, and AND/OR operators to combine multiple terminations.

A C# based application to manage payments, receivables, payrolls, tuition fees, and generate advanced and customizable reports for end of fiscal year.
Among other features from the system, it contains currencies, categories, inventories, and general ledgers.

A multi-tenant C# based application that manages projects, employees, items, and payroll information. The back end is written in .NET and connected to the SQL database, while the front end is written in JQuery and MVC.

A C# API that allows the automation and scheduling of payment transfers to individuals from dedicated funds. Role management is implemented to allow administrators to approve and issue ACH payments. Application is leveraging the AWS ecosystem.