.NET Developer

OPTIVEUM sp. z o.o.; Warszawa; Hybrid; PLN 136,000 - 194,000; Full time

Benefits offered by this job

Rate up to 120 PLN/h net

Hybrid work 75% remote

Direct B2B with Optiveum

Office visits in Warsaw

Support throughout recruitment

Job summary

Optiveum sp. z o.o. is recruiting for a .NET Developer to join a major financial institution in Warsaw.

The role combines hands-on development with collaboration across business units, in a hybrid setup with 75% remote work and occasional visits to the office. You will design and implement IT systems using C#, .NET, WCF, SQL and SSIS, write tests, and contribute to documentation and architectural decisions.

Qualifications

• 3+ years with C#, .NET (4.5+), WCF, SQL, SSIS, HTML, and MVC.NET.
• Proficient in JavaScript, jQuery, HTML5, CSS3.
• Familiar with Visual Studio Ultimate 2013.
• Experience building web applications with testing in mind.
• Knowledge of unit testing and test automation.
• Strong OOP and design-patterns understanding.
• Experience in financial sector or similar complexity projects.
• Analytical thinking with clear requirements definition.
• Excellent communication with clients and teams.
• Independent, goal-oriented, well-organized.
• Native Polish and Advanced English.

Responsibilities

• Design and implement IT systems, including Oracle-based solutions.
• Gather and analyze requirements with end-users to produce actionable tasks.
• Participate in internal software testing.
• Create and update technical and functional documentation.
• Collaborate on developing new solutions and set technical directions.
• Improve data quality in systems exporting data to the data warehouse.
• Review specs and project documents from external vendors.

Skills

C# & .NET

WCF

SQL

SSIS

HTML

MVC.NET

JavaScript

jQuery

HTML5

CSS3

Visual Studio 2013

Unit testing

OOP

Design patterns

Financial sector experience

Analytical thinking

Communication

Independence

Polish (native)

Tools

Sparx Systems Enterprise Architect

UML

Job description

.NET Developer

Salary: Up to 120 PLN/h net + VAT (B2B)

Location: Warsaw, Poland

Work Model: Hybrid (75% remote)

We are looking for an experienced .NET Developer to join the team of our client—a prominent and stable financial institution.

Please note: Optiveum acts as the recruitment partner and the direct contracting party for this role. The successful candidate will sign a B2B cooperation agreement directly with us.

Your Responsibilities

• Designing and implementing IT systems, including Oracle-based solutions.

• Collaborating with business end-users to gather and analyze requirements, specifically detailing broad business concepts into actionable tasks.

• Actively participating in internal software testing.

• Creating and updating technical and functional system documentation.

• Collaborating on the development of new solutions and shaping technical directions.

• Implementing data quality improvements in systems and applications exporting data to the data warehouse.

• Reviewing technical specifications and project documentation provided by third-party external vendors.

What We Expect

• A minimum of 3 years of programming experience using C#, .NET (including 4.5), WCF, SQL, SQL Server Integration Services (SSIS), HTML, and MVC .NET

• Proficiency in JavaScript, jQuery, jQuery UI, HTML5, and CSS3.

• Familiarity with the Visual Studio Ultimate 2013 environment.

• Solid experience in developing web applications.

• Knowledge of unit testing and test automation processes.

• Strong understanding of design patterns and Object-Oriented Programming (OOP) principles.

• Practical experience designing and developing IT systems for the financial sector or organizations of similar complexity.

• Strong analytical thinking skills with the ability to precisely define business and system requirements.

• Excellent communication and negotiation skills for effective collaboration with business clients, internal teams, and external suppliers.

• High degree of independence, strong goal orientation, and great organizational skills.

• Native Polish and Advanced English, enabling seamless work with technical documentation.

Nice to Have

• Basic understanding of UX design principles.

• Familiarity with Agile and XP methodologies.

• Knowledge of PL/SQL and Oracle databases.

• Practical experience with at least one CASE tool (e.g., Sparx Systems Enterprise Architect) and UML.

• Experience working in a matrix organization and knowledge of ITIL.

What We Offer

• A highly competitive rate of up to 120 PLN/h net.

• A flexible hybrid work environment (75% remote) with occasional visits to the Warsaw office.

• A technologically engaging project within a highly stable industry.

• A transparent and direct B2B contract signed seamlessly with Optiveum.

• Full professional support from our team throughout the recruitment process and your contract duration.