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Andre Vasconcellos

@andrevasconcellos

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Backend .NET developer modernizing enterprise systems with CQRS, T-SQL tuning, and Vue.

Brazil

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What I'm looking for

I’m looking for a team where I can own backend .NET delivery end-to-end—modernizing legacy systems safely, improving SQL/data performance, and using Agile practices to ship reliable features without risking business-critical operations.

I’m a Backend .NET Developer with 5+ years of experience building, maintaining, and modernizing enterprise web applications across both .NET Framework and .NET Core. I work hands-on with ASP.NET WebForms (.aspx, code-behind, ViewState, page lifecycle), ASP.NET MVC, and front-end development with Vue.js, translating business needs into reliable APIs and production-ready features.

In Agile/Scrum teams, I deliver incremental modernization without disrupting business-critical workflows—debugging full-stack production issues, optimizing legacy code paths, and strengthening data integrity with deep T-SQL and SQL Server query performance tuning. My background spans finance (Itaú), public sector tax systems (SEFAZ), high-traffic e-commerce (Pernambucanas, Boticário), and industrial cybersecurity, using Clean Architecture, DDD, CQRS, messaging (RabbitMQ), and background processing (Hangfire) to improve scalability and resilience.

Experience

Work history, roles, and key accomplishments

Freelance

Copasa (via JEDI Consulting)

May 2026 - Jun 2026 (1 month)

Implemented endpoints to replace a legacy Dynamics integration with the SAP OData API. Worked across the SAP Service Cloud integration flow, including filtering, ETag retrieval, and PATCH-based updates.

OData SAP Service Cloud Patching API Integration Filtering REST

Mid-Level .NET Developer

ED Soluções

Mar 2026 - Jun 2026 (3 months)

Delivered 10+ features for the STP system using ASP.NET Core with Clean Architecture and CQRS across multiple sprints. Built validated CRUD workflows with BDD test coverage and resolved EF Core/SQL Server trigger integration issues to preserve data integrity.

ASP.NET Core Clean Architecture CQRS Reqnroll BDD EF Core SQL Server Triggers

Backend .NET Developer

TISafe

Aug 2025 - Jan 2026 (5 months)

Contributed to an AI-assisted industrial cybersecurity platform by improving system scalability and code organization. Implemented CQRS with MediatR, AWS S3 storage, OpenTelemetry/Datadog observability, Redis caching, Hangfire background jobs, and xUnit tests.

CQRS MediatR AWS S3 OpenTelemetry Datadog Redis Hangfire xUnit Background Jobs Unit Testing

Mid-Level .NET Developer

TMB Educação

Jul 2024 - Feb 2025 (7 months)

Developed courses, CRM, and payments platform components to support scalability. Built .NET 8 APIs, integrated a React Native front-end, and implemented messaging with RabbitMQ and background processing with Hangfire.

.NET 8+APIs React Native RabbitMQ Hangfire Scalability System Integration

Mid-Level .NET Developer

Glassec Viracon

Jan 2024 - Apr 2024 (3 months)

Evolved an internal business system to improve stability and alignment with business needs. Applied DDD and built full-stack features with Razor Pages and jQuery, integrating with SQL Server via Entity Framework.

DDD Razor Pages jQuery Entity Framework SQL Server Full Stack

Freelance

Boticário

Jul 2023 - Jan 2024 (6 months)

Developed and maintained a high-traffic e-commerce platform during a short freelance engagement. Supported stability and continuity of operations, including legacy ASP.NET WebForms (/.NET Framework 4.x) modules.

ASP.NET .NET Framework Production Stability

.NET Developer

Cliqx (Pernambucanas)

Jul 2022 - Jul 2023 (1 year)

Worked on a high-traffic e-commerce platform with a focus on stability under critical load scenarios. Optimized T-SQL queries using Dapper, developed and documented APIs with Swagger, and supported production sustainment and critical incidents.

Dapper T SQL API Development Production Support Query Optimization

.NET Developer (Junior)

AMCom

Oct 2021 - Jun 2022 (8 months)

Worked full-stack on Project Pegasus, delivering new features with a focus on quality. Restructured code and architecture to reduce complexity, using Angular with .NET Core and modeling data in SQL Server and Oracle.

Angular .NET Core Full Stack SQL Server Oracle Data Modeling

Junior .NET Developer

Capgemini

Jan 2021 - Oct 2021 (9 months)

Developed a high-criticality tax system supporting reliability across complex tax regulations. Applied DDD and MVVM to improve organization and testability, implementing features aligned with tax compliance needs.

DDD MVVM

Junior .NET Developer

Cognizant

May 2019 - Jan 2021 (1 year 8 months)

Contributed to the continuous evolution of Itaú's Portal Imobiliário by building APIs and integrations. Implemented Vue.js (Vue 2) front-end components to modernize legacy screens and supported initiatives including a web crawling solution and the delivery of the “Carta de Crédito” feature.

Vue.Js API Development Web Crawling

.NET Developer Intern

Handsoft

Jan 2016 - Dec 2016 (11 months)

Supported development and maintenance of internal business applications using ASP.NET WebForms and C# on .NET Framework. Assisted with bug fixes and feature implementation while learning WebForms page lifecycle concepts including postbacks and ViewState.

VIEWSTATE ASP.NET C .NET Framework Postbacks ViewState SQL Server