Logo
Harold – .NET Core, React, Data Science, experts in Lemon.io

Harold

From Canada

flag
Full-stack Web DeveloperSenior
Data ScientistMiddle
Machine Learning EngineerMiddle
18 years of commercial experience
Credit and lending
Fintech
AI software
Mobile apps
SaaS
Lemon.io stats

Harold – .NET Core, React, Data Science

Harold has over 15 years of experience in the tech industry and consistently seeks opportunities to enhance his skills, including earning a Master's degree in Data Science and Big Data. Throughout his career, Harold has worked with both large corporations and small startups, specializing in healthcare and finance. He has excelled in full-stack roles and leadership and architectural positions!

Main technologies
.NET Core
8 years
React
5 years
Data Science
4 years
C#
10 years
.NET
4 years
Machine learning
1 year
Additional skills
Microsoft SQL Server
Python
Microsoft Azure
AWS
AI
CI/CD
MongoDB
Django
GCP
PostgreSQL
Node.js
JavaScript
Microservices
NumPy
Pandas
Tensorflow
Docker
SQL Server
Ready to start
ASAP
Direct hire
Potentially possible
Ready to get matched with vetted developers fast?
Let’s get started today!

Experience Highlights

Tech Lead, Full-stack Developer
Oct 2022 - Ongoing2 years 6 months
Project Overview

It's a responsive web app for a fintech company to manage loans, calculate risks and get all customer data by simulating installments.

Skeleton
Skeleton
Skeleton
Responsibilities:
  • Lead the team;
  • Develop Frontend application with React JS and API Rest services using Django Rest Framework;
  • Built the main service to manage the loans in .Net Core and SQL Server;
  • Develop a prototype of the machine learning model to calculate the risk of the current loans to predict the defaults with Python, Pandas, NumPy, Scikit-Learn, and TensorFlow using supervised and unsupervised algorithms;
  • Develop reports with large amounts of data and make the visualization in PowerBI and Qlik Sense using SQL Server and MongoDB;
  • Design the architecture with distributed systems using Bus Services, App Services, and Functions in Azure;
  • Write the unit tests.
Project Tech stack:
.NET Core
AI
React
Python
Microsoft SQL Server
Django REST
Full-stack Developer
Oct 2021 - Sep 202211 months
Project Overview

Financial application for the stock market (Pre-IPO companies). This web application is made in C#, Net core in the backend and the front-end uses Razor pages, using Serverless, Bus Services, Azure Functions, SSO, and Active Directory on Azure.

Skeleton
Skeleton
Skeleton
Responsibilities:
  • Converted an old app with monolithic architecture to services architecture and mobile version with a new responsive web app;
  • Built financial and investment apps with high-security standards using SSO, Federated, SAML, and Active Directory;
  • Designed the architecture using Microsoft technology stack;
  • Collected and documented user requirements and developed logical and physical specifications;
  • Developed training manuals for users.
Project Tech stack:
.NET Core
Microsoft SQL Server
CQRS
Microservices
AWS
Solution Architect, Data Scientist
Jul 2020 - Sep 20211 year 1 month
Project Overview

It is an audit application used to calculate the value of an investment using all the information available worldwide with many data sources. Developed the React front end and data processing with .NET Core. Azure tools used in this project: CosmoDB, Azure Data Lake, Azure Databricks, CI/CD DevOps, Active Directory, SSO, Azure Functions (Python code), and Serverless API with multiple instances configured.

Skeleton
Skeleton
Skeleton
Responsibilities:
  • Processed data for ETL apps with Python and .Net Core;
  • Worked with Microsoft Azure with Databricks and Azure Data Lake and all the CI/CD processes;
  • Developed back-end in the ETL Team in C#, Python, Databricks, and Spark;
  • Built front-end in React for the ETL user app;
  • Developed the machine learning code to filter the data from the sources and get the most valuable data;
  • Developed ETL applications: Extract-Transform and Load with Python, Numpy and Pandas. Experienced with Azure with Databricks and Azure Data Lake and all the CI / CD processes;
  • Designed and improved the architecture of the new features;
  • Maintained big data in Azure Data Lake, MongoDB, and SQL Server;
  • Developed a prototype of an Xamarin App for internal use of the auditors to get the state of the ongoing projects.
  • Managed Azure DevOps CI/CD.
Project Tech stack:
.NET Core
React
Python
Microsoft SQL Server
CI
CD
MongoDB
Data Science
Xamarin
Tech Lead, Full-stack Developer, Data Scientist
Nov 2015 - Jun 20204 years 6 months
Project Overview

It is a financial and accounting application for managing loans and credit risk. This is a set of web applications for PC and mobile. He worked in both mobile and web applications with React, .Net Core, and Xamarin. Likewise, he made several Restful API services and machine learning code with Python.

Skeleton
Skeleton
Skeleton
Responsibilities:
  • Developed back-end services and API in .Net Core, Python, and Django Rest using SQL Server and MongoDB;
  • Built front-end in React, Bootstrap, and Tailwind;
  • Develop and maintain the mobile applications for the Wallet and Payment Gateway in Xamarin.
  • Developed data analytics apps with AI;
  • Built and managed dashboards in PowerBI, IBM Cognos, and Qlik Sense;
  • Led tech team in software development projects.
Project Tech stack:
.NET Core
Python
Microsoft SQL Server
Pandas
NumPy
Django
Django REST
Microsoft Azure
AI
Xamarin
Tensorflow
Machine learning

Education

2021
Data Science and Big Data
Master's degree

Languages

English
Advanced

Hire Harold or someone with similar qualifications in days
All developers are ready for interview and are are just waiting for your requestdream dev illustration
Copyright © 2025 lemon.io. All rights reserved.