Lead Senior NET Developer

Innovate online banking and join the team as a Senior .NET Developer!

Warsaw / Łódź-based opportunity with hybrid work model (2 times in the office / month).

As a Senior .NET Developer you will be working for our client, a leading company in the online banking sector that is currently expanding its digital solutions to provide secure, scalable, and efficient services to millions of customers. You will play a key role in developing and implementing backend systems that ensure high performance and reliability, while also taking responsibility for guiding project design, development, and deployment. This position offers the opportunity to contribute to cutting-edge financial solutions while collaborating with a highly skilled technical team.

Your main responsibilities :

Implement backend solutions using .NET Core, .NET Framework, and MS SQL

Ensure high code quality by writing unit and automated tests

Lead project design, development, and deployment activities

Collaborate with cross-functional teams to define technical requirements

Review and optimize code to improve performance and scalability

Maintain technical documentation and contribute to knowledge sharing

Support integration of REST APIs with internal and external systems

Mentor junior developers and provide technical leadership

You're ideal for this role if you have :

At least five years of experience in backend development with C#, SQL, and REST API

Advanced knowledge of .NET Framework, .NET Core, and ASP.NET WebAPI

Strong understanding of architectural patterns for scalable and high-performance solutions

Proficiency with version control and collaboration tools such as Git, Jira, and Confluence

Experience in writing unit and automated tests

Ability to design and implement secure, reliable, and maintainable solutions

Strong problem-solving and analytical skills

Solid communication skills in English for reading, writing, and technical discussions

Ability to work independently as well as in a team-oriented environment

Nice to have : Knowledge of :

masstransit

nservicebus,

Elasticsearch

Kubernetes

We offer you :

ITDS Business Consultants is involved in many various, innovative and professional IT projects for international companies in the financial industry in Europe. We offer an environment for professional, ambitious, and driven people. The offer includes :

Stable and long-term cooperation with very good conditions

Enhance your skills and develop your expertise in the financial industry

Work on the most strategic projects available in the market

Define your career roadmap and develop yourself in the best and fastest possible way by delivering strategic projects for different clients of ITDS over several years

Participate in Social Events, training, and work in an international environment

Access to attractive Medical Package

Access to Multisport Program

Access to Pluralsight

Flexible hours & remote work