Senior .NET Developer with Fintech EXP!

MARGO; Warszawa; On-site; PLN 165,312 - 185,976; Full time

Job summary

MARGO, a leading financial institution in Poland, is seeking a seasoned Senior .NET Developer to join our engineering team. You will focus on backend ecosystem development using C#, .NET, and SQL to support critical banking operations.

The role offers a hybrid work model, requiring only 2 office days per month, ensuring a balanced work-life. Ideal candidates will have at least 4 years of relevant experience and strong English communication skills.

Qualifications

• Minimum of 4 years of hands-on experience with C#, .NET, and SQL.
• Proven capability in software testing and automation methodologies.
• Strong command of English to work with technical documentation.

Responsibilities

• Develop and maintain backend systems for banking applications.
• Drive quality through unit testing and automation.
• Deliver clean and maintainable code based on user requirements.

Skills

Advanced Software Engineering

Testing & Automation

C# and .NET Programming

SQL Server

English Proficiency

Tools

MSSQL

Visual Studio

Git

JIRA

PowerShell

Job description

Are you a seasoned software engineer looking to drive impactful backend solutions within a secure, large-scale enterprise environment? A leading international financial institution is seeking a Senior .NET Developer to join a highly specialized engineering team. In this role, you will play a pivotal part in designing, developing, and maintaining critical applications that support sophisticated financial operations. This is an exceptional opportunity for a senior professional who thrives on technical autonomy, values robust engineering practices, and is looking for a stable yet modern environment where their architectural input truly matters.

120 zł - 135 zł an hour

Technical Profile & Responsibilities

In this role, your core focus will center on backend ecosystem development (.NET/C# + MSSQL/T‑SQL), ensuring high performance, security, and scalability of the banking systems.

Key Responsibilities & Requirements:

• Advanced Software Engineering: Apply deep knowledge of advanced .NET programming, system design methodologies, and user requirements analysis to deliver clean, maintainable code.
• Testing & Automation: Drive quality through rigorous unit testing and test automation methodologies to uphold strict financial software standards.
• Professional Experience: A minimum of 4 years of hands‑on experience delivering IT projects using C#, .NET, WCF, SQL, SQL Server Integration Services (SSIS), HTML, MVC.NET, and ASP.NET.
• Tools & Environment: Proficiency with MSSQL, Visual Studio, Git, JIRA, MSBuild, TeamCity, and PowerShell.
• Language Proficiency: Strong command of English, at least sufficient to seamlessly understand and work with complex technical documentation.

Nice-to-Have Qualifications:

• Foundational knowledge of frontend technologies and practical experience with Blazor.
• Hands‑on experience or familiarity with containerization and orchestration via Kubernetes (K8s).
• Professional certifications such as MCTS: .NET Framework 4.0, ASP.NET Applications.
• Readiness to validate technical expertise through competency tests during the recruitment process.

Join the Team

This position is based out of our modern office space in Łódź, Poland, and offers an excellent work‑life balance through a highly flexible hybrid work model requiring only 2 days per month in the office.

The targeted start date for this vacancy is 15 June 2026.

If you are a senior technical expert looking to elevate your career within an institution that values data discretion, engineering excellence, and structural stability, we want to hear from you. Take the next step in your professional journey—apply today by submitting your English CV.