Vitor Paulino
Welcome, and thank you for stopping by!
This page offers a glimpse into my journey as a Software Engineer —
a space where I share who I am, what I’ve worked on, and how I contribute to building meaningful, maintainable, and scalable software.
I’m currently working as a contractor, partnering with companies that value growth, clarity, and engineering excellence.
My focus is on helping teams perform at their best while aligning technical solutions with business goals.
I'm always open to new challenges where I can make a positive impact.
About Me
I’m a seasoned Software Engineer with nearly 15 years of experience designing, developing, testing, and deploying distributed backend applications—mainly using .NET, Java, and JavaScript tech stacks. My journey has taken me through consultancy, product development, R&D, and enterprise support—giving me a well-rounded perspective on software challenges and solutions.
Over the years, I’ve worn many hats, including Software Developer, Senior Developer, Tech Lead, Systems Architect, and Scrum Master. I’ve led high-performing teams and worked as an Engineering Manager, Technical Lead, and Senior Software Engineer.
At Microsoft, I handled over 200 high-severity cases for top enterprise customers, sharpening my problem-solving skills. I’m a strong advocate of Agile Architecture, SOLID principles, TDD, and design patterns. Above all, I value learning, coaching, and collaboration.
Technical Skills
Soft Skills
Business Areas
Professional Experience
Software Engineering Lead at Europ Assistance Portugal
Project 1: Uber and Bolt Integration APIs
Led the development and integration of APIs for Uber and Bolt, ensuring seamless communication and data exchange. Managed a cross-functional team using Scrum and drove project success.
Project 2: Service Provider Management Backend and Backoffice
Directed the design and development of a robust orchestration backend integrated with Gestow APIs, leading a team of 4 from architecture through deployment.
Additionally, contributed to organization-wide SDLC standards, reviewed code, provided architecture guidance, and collaborated directly with stakeholders and partners to align delivery with business needs.
Developer Support Engineer at Microsoft
Provided expert-level support for over 200 technical cases (including 50 escalations) involving IIS, WCF, ASP.NET, and SignalR — among Microsoft’s top enterprise clients. Delivered root-cause analysis and resolution for critical incidents within SLA, collaborating across teams.
Leveraged advanced tools like WinDbg (with MEX, SOSEX, NetExt), PerfView, and log diagnostics to solve complex server-side issues in ASP.NET and WCF applications. Diagnosed performance bottlenecks, scalability issues, and security vulnerabilities, delivering effective action plans.
Authored technical documentation, KBs, and best practices. Mentored junior engineers, significantly raising the support team's effectiveness within 3 months. Maintained a strong customer-first mindset while contributing to internal knowledge initiatives.
Scrum Knight at Critical TechWorks
Served as a Scrum Master and team lead in a cross-functional product team. Facilitated Agile ceremonies, coached the team on Scrum best practices, and ensured efficient and collaborative delivery cycles.
Supported backend development and frontend Angular SPA with clean code, TDD, and SOLID design principles. Engaged in pair programming, code reviews, and architecture discussions with a team of 5 engineers.
Led a distributed architecture built in Java (Open SDK 1.8), JAX-RS 2.1, and JPA, using Kafka for asynchronous messaging, and PostgreSQL for persistence. CI/CD powered by Jenkins, with deployment across OpenShift environments. Actively contributed to the architecture roadmap to support Azure AKS migration initiatives.
Senior Software Developer at Siemens Lisbon Tech Hub
Acted as Team Lead, Tech Lead, and Software Architect within a DevOps-oriented team, guiding day-to-day development while supporting international collaboration across Germany, Croatia, and Portugal.
Spearheaded the modernization of legacy VBScript-based internal tools, migrating to modern .NET Framework and .NET Core applications hosted on Azure. Led a team of 5 developers, emphasizing SOLID principles, TDD, and clean architecture.
Delivered cloud-native solutions using Azure App Services, Azure Functions, Cosmos DB, SQL on Azure, and Blob Storage. Designed and deployed Q&A bots using Microsoft Bot Framework for integration with Teams and SharePoint.
Facilitated internal workshops on object-oriented programming, UML design, and clean architecture to upskill teams and promote DevOps culture.
Senior Software Engineer at Vision-Box
Focused on research and development using .NET Core to enhance performance-critical areas such as WebSockets communication and serialization mechanisms.
Contributed to architectural improvements through refactoring efforts, performance tuning, and high-quality C# code. Practiced SOLID principles, TDD, and clean code daily, while engaging in pair programming, code reviews, and system design discussions.
As a senior member of the team, promoted engineering excellence by advocating for clean architecture, DevOps culture, and software quality awareness in a fast-paced environment, helping improve delivery outcomes and team maturity.
Consultant Software Engineer at PRIME IT CONSULTING
Worked as an outsourced developer for NOS Inovação, delivering solutions across the full stack using .NET Framework and Angular. Actively participated in backend and frontend implementations aligned with NOS’s innovation strategy.
Beyond technical delivery, contributed to team development through mentoring and coaching activities focused on core technologies like MongoDB, Angular, and .NET Framework. Supported junior and mid-level developers eager to grow their skills and confidence in software engineering.
Developer & Team Lead at NOS Inovação
Grew from developer to team leader within the core platform team responsible for Set Top Box Authentication and Authorization systems, supporting over 1 million customers and OTT applications.
Delivered and maintained critical services using ASP.NET 5.0 Web API and MVC, contributing to CI/CD pipeline implementation with Jenkins. Practiced SOLID, TDD, and clean code, and collaborated via pair programming and architecture discussions.
Led R&D and architecture of microservices migration to ASP.NET Core 1.1 with Docker, supporting real-time authorization, RabbitMQ messaging, and MongoDB persistence.
Contributed to the pilot of NOS Share, developed in partnership with Microsoft, building solutions using Azure Web App Services, Blob Storage, Media Services, and Azure Service Bus.
Consultant at Novabase
Began my professional journey with an intensive 2-week internship focused on consulting soft skills and software architecture, simulating high-pressure delivery environments. The experience covered communication, presentation, and professional relationship skills, culminating in a delivered software POC.
Worked on projects for major clients across the Telco, Transport, Public Sector, and Banking industries. Involved in full-stack development of web applications using .NET (C# and VB.NET), backed by SQL Server and Oracle databases.
Actively engaged in software requirements gathering (functional and non-functional), contributing to both the technical implementation and the customer-facing aspects of delivery.
Articles
From Smooth to Stuck: Diagnosing .NET Systems That Choke Under Load
Modern .NET systems often appear healthy — low CPU, stable memory — even as users experience slowdowns. The root cause? Thread starvation, async backlog, and invisible queuing due to IO pressure, memory retention, and overworked thread pools.
June 27, 2025 · 14 min read
Read ArticleFrom Local Certainty to Distributed Chaos: Handling Consistency and Integrity in .NET Systems
In local systems, a transaction is enough to ensure consistency. In distributed systems, it isn’t. This article walks through how to evolve from simple DbContext.SaveChangesAsync() logic into robust patterns like execution strategies, the Outbox pattern, and idempotent consumers. You'll learn how to preserve integrity across retries, external calls, and scale — without relying on distributed transactions. Real .NET code included.
June 14, 2025 · 11 min read
Read ArticleFrom Vague Requests to Valuable Stories: A Scrum Master’s Journey in Product Discovery
This post captures some of what I’ve been learning while working as a Scrum Master — a role that continues to offer insights I find valuable beyond delivery, especially when bridging product understanding with technical decision-making.
April 9, 2025 · 19 min read
Read ArticleDesigning with LLMs: Building a Prompt Pipeline Architecture
Over the past few months, we’ve seen a surge in applications that integrate Large Language Models (LLMs). While getting started with models like OpenAI’s GPT or locally hosted options like Ollama is relatively easy, building real, scalable applications with LLMs requires more than sending a prompt and waiting for a response.
April 5, 2025 · 6 min read
Read ArticleManage Pull Requests
Pull requests is one important milestone when delivering software, especially if you are delivering software using CI/CD approach. It is a point in time where the team is able to share, learn, deliver and improve the product or the project they are delivering to the business.
October 11, 2019 · 5 min read
Read ArticlePresentations
Clean Code
Presentation with fundamentals content about how to write code full of rules of thumb that should be considered when writing code to be maintanable and shared across multiple developers
Padrões de Desenho
Presentation with fundamentals content about the importance to exist design patterns.
DevOps
Presentation with fundamentals about devops culture and what is part of that culture
Message Pack
Presentation with details about what protocol is this and how does it work
From Monolith to Microservices
Presentation about the jorney, what are the painpoints, considerations to take and how to approach with an evolving architecture design
From Monolith to Serverless
Presentation about the jorney, how to transform your application from monolith to reach serverless architecture style
Highlighted GitHub Repositories
BlobSyncer
BlobSyncer.Azure.BlobStorage is a tool designed to download files from Azure Blob Storage and store them in the filesystem. It is structured to support additional syncing features in the future, allowing files to be synced to another Blob Storage using DestinationHandlers.
View RepoDotnet Performance
This repository contains a set of code samples on how to use .NET performance type System and the C# Language to implement performant code.
View Repoweatherforecastspa ( on steroids)
this project consists on the presentation of several Microsoft .Net technologies and sdks on how to use them to build reactive UIs. This POC continues the weatherforecast angular template from visual studio.
View RepoIdentity Provider
A minimal Identity Provider built in ASP.NET Core to explore and understand OAuth2 and OpenID Connect flows, including Authorization Code and On-Behalf-Of.
View RepoInvoices Management
this is an application that runs Periodically to extract invoices from my gmail account to a specific disk location.
View RepoLibraries To Infrastructure
This solution groups a set of projects that are common used accross diferent types of business solutions to use infrastructure or services.
View Repo