João Estrela — Senior Software Engineer

Who I am

About

After completing high school, I proactively began building my professional career in software development. Over the past decade, I've grown from a junior web developer into a senior engineer who ships production systems used globally.

My journey spans the full software lifecycle — from .NET backend and frontend development, to DevOps engineering and cloud-native architectures on GCP and Azure. I've worked with global enterprises like Siemens and delivered impactful solutions across multiple industries including finance, food-tech, and hospitality.

I thrive in environments where I can contribute technically and strategically — I've also acted as Product Owner, bridging the gap between customers and development teams.

📍 Based in Rinchoa, Lisbon, Portugal · 🇵🇹 Portuguese native · 🇬🇧 English C1

10+

Years of Experience

6

Companies

30+

Technologies

C1

English Level

Where I've worked

Experience

Senior Software Engineer

● Sep 2025 – Present

Syone – Sihot · Lisbon

Lead developer for an internal helpdesk application to manage support tickets for hotel systems
Implemented Hangfire jobs to automate and streamline internal processes
Built unit tests for Backend and Frontend using xUnit, bUnit and Moq

.NET 9C#BlazorPostgreSQLEF CoreODataRadzenAWS S3AWS LambdaHangfirexUnitbUnitGitLab

Senior Software Engineer

Jan 2023 – Aug 2025

Syone – Cheffelo · Lisbon

Built a new application to plan menus for the client, managing recipes and ingredients
Developed and maintained CI/CD pipelines using Azure DevOps
Implemented Hangfire jobs to automate legacy manual procedures
Created unit tests for BackEnd and FrontEnd using xUnit, bUnit and Moq
Maintained a legacy application managing all suppliers and recipes

.NET 8BlazorC#SQL ServerAzure DevOpsAzure ServiceBusAzure FunctionsAzure KeyVaultGraphQLMudBlazorAntBlazorHangfirexUnit

Software Engineer

Jan 2022 – Jan 2023

Closer Consulting · Lisbon

Developed and maintained automated CI/CD pipelines using GitLab CI/CD
Managed infrastructure automation with Terraform and Pulumi
Integrated with GCP services: Pub/Sub, BigQuery, Firestore, Cloud Build and GKE
Built and deployed Docker containers for Microservice Architecture
Developed an ETL pipeline to import data directly into BigQuery

PythonGCPDockerKubernetesTerraformPulumiGitLab CI/CDBigQueryFirestorePub/SubJira

IT Software Developer

Jul 2018 – Jan 2022

Siemens · Lisbon

Developed an internal Kanban Board and Customer Support Action tool for global Siemens factories
Designed the new Clean Architecture for MyFlow — a Business Process Management platform
Acted as Product Owner for MyFlow: roadmap definition, sprint planning, customer workshops
Built REST APIs consumed by mobile apps and frontends, and contributed to internal NuGet packages
Developed and maintained CI/CD pipelines in Azure DevOps

.NET Core 2C#AngularSQL ServerAzure DevOpsEntity FrameworkSwaggerScrumKanban

Web Developer

Apr 2018 – Jul 2018

Affinity – Wingman · Lisbon

Maintenance and development of new features for the Via Verde website and backoffice

.NET C#AngularJSSQL ServerjQueryEntity FrameworkDotNetNukeMVC

Web Developer

Mar 2015 – Apr 2018

Closer Consulting · Lisbon

Evolutionary maintenance of a .NET WebForms/MVC ticket manager for Call Center
Developed new features for a .NET WebAPI + AngularJS operator terminal management system
Built several SSIS systems to import data into the ticket manager project
Developed an application to send and receive mails from different mailboxes (IMAP/POP3/SMTP)

.NET C#AngularJSSQL ServerSSISjQueryAJAX.NET Framework 4.5WebFormsMVC

What I work with

Skills

⚙️.NET Ecosystem

.NET 9 / 8 / CoreC#ASP.NET MVCWebAPIBlazorEntity FrameworkLINQHangfireNuGet

🎨Frontend

HTMLCSSJavaScriptAngularAngularJSjQueryMudBlazorAntBlazorRadzenGraphQL

☁️Cloud & DevOps

Azure DevOpsAWS (S3, Lambda, KMS)GCPGitLab CI/CDDockerKubernetesTerraformPulumiAzure Functions

🗄️Databases

SQL ServerPostgreSQLBigQueryFirestoreSSISOData

🧪Testing & QA

xUnitbUnitMoqPython TestingSwaggerPostman

📐Architecture & Methods

Clean ArchitectureMicroservicesREST APIsCI/CDScrumKanbanDomain-Driven Design

Personal projects

Portfolio

🌐

↗

Luís Antunes & Estrela, Lda.

luisantunes-estrela.pt

Institutional website for a Portuguese electrical services and maintenance company founded in 1992, based in Odivelas. Covers company history, services, and contacts.

🌐

↗

Inês Barata Reis

inesbaratareis.pt

Professional website for a Clinical Psychologist and Hypnotherapist based in Cascais. Features service pages, FAQ, and a booking form with email integration.

Academic background