Senior .NET Software Engineer

Lisbon, Lisbon, pt on site Until 8/21/2026 First posted February 2, 2026 Last posted February 25, 2026
Job description

Inetum is a global leader in IT services, dedicated to providing innovative solutions to our clients. We are committed to fostering a dynamic, inclusive workplace that values diversity, where creativity and collaboration thrive. We operate in 19 countries with more than 28,000 employees worldwide.

If you are looking for a dynamic, innovative, and technology-driven company, Inetum is the place for you! Come be Inetum!

We are looking for an outstanding Software Engineer with strong knowledge of .NET Core and .NET Framework.

In our team we face many challenges where you can help us. Starting with the migration from .NET Framework to .NET Core, working on improving our SQL queries and speeding up the average response time of our API are just a few examples of what you can do in our team.

Currently, our platform is written in C# using Oracle Coherence and Microsoft SQL Server. Expertise in distributed cache, low‑latency messaging, and critical‑performance environments is a real plus.                                                                                                                                                                                  

Main Tasks and Responsibilities:

  • Design, develop, test, and deploy new features/enhancements in .NET Core/.NET Framework.                                    
  • Proactively influence and improve software design decisions, contributing to functional and technical excellence.                     
  • Hands‑on with NuGet package creation/consumption and dependencies.                                         
  • Optimize performance of distributed cache and SQL databases; profile queries and tune the data layer.  Implement observability (OpenTelemetry, OpenSearch) and ensure secure, high‑quality code through reviews and automated testing.                                       
  • Provide third‑line technical support for production incidents when needed.       

Technical Skills

  • C#                                      
  • SQL                                    
  • .Net Core\Framework                                 
  • OpenTelemetry, OpenSearch and prometheus                                
  • Jira, Bitbucket, Ansible Tower, Jenkins or TeamCity                                                                                                                

Language Skills:

  • English - Expert

                              

Soft Skills:

  • Strong analytical and problem-solving skills with a strategic mindset to drive innovation in software solutions              
  • Communication                                            
  • Experience working in distributed teams with a solid understanding of Agile methodologies and tools like Jira and Bitbucket
  • Knowledge of secure coding principles, functional design systems, and architectural patterns                            
  • Experience working with distributed development teams                          
About this role

Summary

Design, develop, and optimize .NET applications, improve performance, and support production issues.

Job title

Senior .NET Software Engineer

Experience level

not specified

Industry

software

Location requirements

Lisbon, Portugal; remote work not specified

Salary

Not specified

Management role

No

Skills & keywords

Required skills

C#SQL.NET Core.NET FrameworkOpenTelemetryOpenSearchJiraBitbucketJenkins

Preferred skills

distributed cachelow-latency messagingperformance tuningautomated testing

Specializations

.NET CoreC#SQLdistributed cacheperformance optimization
Locations

Structured locations inferred from the posting.

Lisbon, Portugal

On-site City