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Yoandry Leon Perez

@yoandryleon

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Senior Full-Stack Developer building and modernizing enterprise SaaS, APIs, integrations, and cloud applications.

Spain

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What I'm looking for

I'm looking for a senior full-stack development role where I can build and modernize enterprise applications across Java, .NET, Angular, and React. I'm particularly interested in technically demanding products involving APIs, integrations, cloud services, distributed systems, and long-term platform evolution.

Senior Full-Stack Developer with extensive experience building and modernizing enterprise web applications, SaaS platforms, APIs, and integration services. Hands-on across Java and Vaadin, C# and .NET, Angular and React, supported by Azure, AWS, relational, and NoSQL databases.

Experienced throughout the full software lifecycle, from estimation and solution architecture to implementation, testing, deployment, troubleshooting, and production support. I also provide technical direction for distributed teams while remaining actively involved in delivery and code quality.

Experience

Work history, roles, and key accomplishments

Senior Java Developer

Sferion

Jan 2021 - Jul 2026 (5 years 6 months)

Built and maintained enterprise web applications with Java and Vaadin, translating business requirements into maintainable features and reliable user workflows. Delivered features, troubleshooting, testing, code-quality improvements, and long-term application maintenance within a distributed team.

Java Vaadin enterprise web apps Troubleshooting Testing Code Quality Distributed Team Collaboration

Senior Full-Stack Developer / Technical Lead

NTSprint

Jun 2016 - Jul 2026 (10 years 1 month)

Developed and modernized full-stack SaaS and enterprise applications across Java, C#, .NET, Angular, React, cloud services, APIs, and relational databases. Provided technical direction across three distributed development teams while maintaining responsibility for code quality, maintainability, releases, and delivery planning.

Java C#.NET Angular React Cloud Services APIs Relational Databases Architecture Testing Code Review Deployment Production Support Technical Direction

Senior Software Developer / Developer Manager

CGSupply

Feb 2019 - Dec 2020 (1 year 10 months)

Developed an OCR-based document-indexing and invoice-processing platform that reduced manual intervention using ASP.NET MVC, Windows Services, SharePoint, Power Automate, Kendo UI, Hangfire, and SignalR.

ASP.NET MVC Windows Services SharePoint Power Automate Kendo UI Hangfire SignalR OCR Document Indexing Invoice Processing

Senior Software Developer

Denizn

Apr 2018 - Feb 2019 (10 months)

Built a property-management platform connecting tenants, property managers, and service providers, including IoT integrations, with Angular, .NET Core, AWS, Material Design, and SignalR.

Angular .NET Core AWS Material Design SignalR IoT Property Management

Software Developer

WokeUp

Jan 2018 - Apr 2018 (3 months)

Built a social-collaboration platform for civic awareness using .NET Core, React.js, and Microsoft Service Fabric.

.NET Core React Azure Service Fabric Collaboration

Software Developer

ObjectArt OHOB

Jan 2017 - Jan 2018 (1 year)

Delivered an Angular and Bootstrap administration portal for a meditation application.

Angular Bootstrap Portal Administration

Software Developer

ObjectArt CPTI

Jun 2016 - Jan 2017 (7 months)

Integrated three APIs during a live ERP and CRM migration using .NET APIs, WCF, and Windows Services.

.NET WCF Windows Services ERP CRM API Integration

Software Developer

WorldMusicStage

Apr 2016 - Jun 2016 (2 months)

Developed a full-stack platform for promoting artists, events, and live shows with .NET, SQL Server, and Bootstrap.

.NET SQL Server Bootstrap Fullstack Development

Software Developer

MCK&T Inc.

Jan 2015 - Jan 2016 (1 year)

Built a business-intelligence SaaS application and data-integration tools using Java, MongoDB, .NET, Bootstrap, jQuery, Durandal, and Knockout.js.

Java MongoDB .NET Bootstrap jQuery Durandal KnockoutJS Business Intelligence SaaS Data Integration

Software Developer

Desoft

Aug 2012 - Jan 2015 (2 years 5 months)

Developed BIMAS Suite, a strategic-planning and performance-management platform, using Java, Liferay, and jQuery. Contributed to a registered software innovation later listed as BIMAS Performance Management, CU Reg 1471-2013.

Java Liferay jQuery Strategic Planning Performance Management