12/16/2025 updated

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Backend Engineer | .NET & C# | Web APIs & Microservices | Remote

Quarteira, Portugal
Worldwide
Licentiate degree in Computer/Information Technology Administration and Management
Quarteira, Portugal
Worldwide
Licentiate degree in Computer/Information Technology Administration and Management

Profile attachments

CV - Sergio Fernandes.pdf

ASP.NET.NET FrameworkApplication Programming Interfaces (APIs)C Sharp (Programming Language)PostgreSQLMicrosoft SQL ServersMongoDB.NET CoreBackendApache KafkaWeb ApiMicroservices
I am a backend software developer with 17+ years of experience focused on C# and .NET, building and maintaining robust APIs and backend systems in production environments.

I’ve worked extensively with ASP.NET, .NET Core, SQL Server, and modern backend architectures, including microservices and message-based systems. I’m comfortable improving existing codebases as well as building new services from scratch, with a strong focus on performance, reliability, and clean design.

For the last 12 years, I’ve worked fully remote with distributed teams across Europe, the UK, and the US, owning backend features end-to-end and collaborating closely with product and engineering teams.

My core expertise is backend development with:
➤ C# / .NET / ASP.NET / Web APIs
➤ SQL Server, PostgreSQL, MongoDB
➤ Message-based and event-driven systems (including Kafka)
➤ Designing and consuming APIs, integrating third-party systems, and improving existing architectures

Experience

Professional experience10+ years
Freelancer since2013

Languages

EnglishFluentPortugueseNative speaker

Project history

Software Developer | Power Platform | .NET Core | C#

Alsvior Global
➤ Development and maintenance of applications using Power Apps, Power Automate, Dataverse and SharePoint. Architect and develop robust back-end services and APIs using C# and .NET Core to integrate with and extend the Power Platform.

➤ Collaborate with stakeholders to translate complex business requirements into technical specifications and solution designs.

Product Developer | .Net Core | C#

FreeConcept
➤ Help building and delivered a Business Activity Monitoring (BAM) solution for a major Angolan institution, using C#, ASP.NET Core, and a microservices architecture.

➤ Responsible for designing scalable services, integrating real-time data flows, and ensuring high availability and performance across the platform. Contributed to end-to-end development, deployment, and optimization of the solution.

Product Developer | .NET Core | C#

IG CloudOps - We do AWS, Azure & GCP
➤ Led backend development of IG CloudOps’ unified cloud management platform, supporting Azure, AWS, and GCP environments.

➤ Architected microservices using .NET Core and Docker, improving system modularity and deployment speed.

➤ Collaborated with cross-functional teams to deliver features aligned with enterprise client needs, driving roadmap execution and product scalability.

Senior Software Developer

Fuseideas
➤ Developed CMS-driven web applications using Kentico and C#, enhancing digital experiences for major marketing campaigns.

➤ Conducted functional and technical requirements analysis to ensure robust, maintainable codebases.

➤ Championed best practices in software development, mentoring junior developers and streamlining delivery pipelines.

Software Development Manager

igroup - For Azure & AWS
➤ Led the Portuguese office operations for a Microsoft and AWS partner, managing distributed development teams across the UK and Portugal.

➤ Oversaw recruitment and onboarding of SharePoint technical talent, ensuring high-quality delivery and team cohesion.

➤ Designed and implemented enterprise-grade solutions using .NET and SharePoint, tailored to complex business requirements.

➤ Advocated for remote work culture, optimizing workflows and communication across time zones.

Senior Technical Consultant

Bright Partners
➤ Delivered custom SharePoint and C# solutions for enterprise clients, aligning technical architecture with business goals.

➤ Led functional and technical requirements analysis, mentoring junior developers and guiding project execution.

➤Played a key role in improving delivery efficiency and code quality through coaching and process refinement.

Senior Software Developer

SATEC
➤ Designed and developed structured content management systems using SharePoint and .NET technologies.

➤ Collaborated with cross-functional teams to deliver high-impact web solutions for public and private sector clients.

➤ Focused on scalability and maintainability in solution architecture, contributing to long-term client success.

Software Developer

Critical Software
➤ Designed and implemented enterprise-grade web content management solutions using SharePoint and .NET technologies.

➤ Conducted functional requirements analysis for mission-critical applications, ensuring alignment with business objectives and technical feasibility.

➤ Contributed to high-structure software projects in safety and business-critical domains, emphasizing reliability, scalability, and maintainability.

Software Developer | SharePoint Consultant

Unisys
➤ Developed and maintained collaboration portals using SharePoint Server 2007/2010 for clients in government, finance, and commercial sectors.

➤ Led SharePoint migration projects from 2007 to 2010, enhancing platform performance and user experience.

➤ Delivered tailored solutions based on in-depth functional requirements analysis, focusing on secure, scalable architecture and seamless user adoption.

Junior Consultant | Web Developer

Digital Group Portugal
➤ Built intranet-based portals using ASP 3.0, ASP.NET 2.0, and SQL Server, streamlining internal communication and operational workflows.

➤ Implemented CMS solutions and supported web hosting environments, ensuring uptime, performance, and content accessibility.

➤ Gained foundational experience in full-stack development, digital marketing technologies, and client-facing solution delivery.

Certificates

Microsoft Certified Professional

Microsoft

2025

MCSA: Web Applications

Microsoft

2016

MCSE: Productivity

Microsoft

2016

MCSA: Office 365

Microsoft

2016

Managing Office 365 Identities and Requirements

Microsoft

2014

Developing Microsoft Azure and Web Services

Microsoft

2013

Programming in HTML5 with JavaScript and CSS3

Microsoft

2013

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