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Senior Fullstack Developer (.NET & React)
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Offer summary

(Summary generated by AI based on the full job description)

The project involves building scalable applications for a client in the technology sector. The tech stack includes C# (.NET Framework/.NET Core/.NET Standard), React 18+ and T-SQL / SQL Server Management Studio. Core responsibilities cover backend and frontend development, legacy code analysis and refactoring, architecture design, performance optimization and debugging, and collaboration within SCRUM. Offered benefits include private medical care, Multisport and access to Pluralsight.

you can start ASAP

Senior Fullstack Developer (.NET & React)

Company: ITDS Polska Sp. z o.o.

from: 16 October 2026
to: 15 November 2026
18 900 - 24 150 złnet (+ VAT)/ mth.B2B contract (full-time)
15 000 - 18 000 złgross/ mth.contract of employment
Offer parameters
level:senior
working mode:hybrid
Gdańsk, Pomeranian
Gdańsk, Pomeranian

Requirements

Expected technologies

C#
.NET Framework
.NET Standard
.NET Core
React (18 and above)
TSQL
SQL Server Management Studio
Visual Studio
Agile (SCRUM)
DDD
Clean Code
SOLID

Optional technologies

Postman
PlayWright
WCAG

Our requirements

  • At least 5 years of experience in developing .NET applications.
  • A minimum of 3 years in React-based front-end development.
  • Strong knowledge of C# (.NET Framework, .NET Standard, .NET Core).
  • Skilled in debugging, performance profiling, and analyzing complex code.
  • Proficiency in architectural patterns, asynchronous communication, and software design.
  • Experience with TSQL and SQL Server Management Studio.
  • Familiarity with Visual Studio.

Optional

  • Experience building views for mobile applications.
  • Background developing applications for the financial industry.
  • Automation testing experience with tools like Postman or PlayWright.
  • Knowledge of WCAG standards.

Your responsibilities

  • Develop high-quality software in C# ensuring adherence to technical documentation.
  • Implement front-end features using React (18 and above) to deliver dynamic user interfaces.
  • Analyze and enhance existing legacy code bases, ensuring consistent performance.
  • Design and develop robust application architectures aligned with best practices.
  • Collaborate closely with testers, analysts, and product owners within Agile (SCRUM) methodologies.
  • Conduct debugging, profiling, and performance analysis to optimize application efficiency.
  • Apply principles of DDD, Clean Code, and SOLID to maintain code quality and scalability.
  • Work with TSQL and SQL Management Studio to develop and optimize database interactions.

About the project

Warszawa/ Gdańsk - based opportunity with hybrid work model(1 day/ week in the office).
As a Senior Fullstack Developer (.NET & React), you will be working for our client, a leader in the technology sector dedicated to developing scalable and efficient software solutions. You will contribute to creating cutting-edge applications that drive digital transformation and provide impactful user experiences. This role offers a unique chance to grow your career amidst a forward-thinking team that values innovation and excellence.

#GETREADY to meet with us!

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.
We would like to meet you. If you are interested please apply and attach your CV in English or Polish, including a statement that you agree to our processing and storing of your personal data.

ITDS’s Whistleblower Procedure

📌 You can report violations in accordance with ITDS’s Whistleblower Procedure available here: https://itds.pl/wp-content/uploads/2025/03/INFORMATION-ON-PROCEDURE-FOR-REPORTING-BREACHES-AND-PROTECTION-OF-WHISTLEBLOWERS-AT-ITDS-POLSKA.pdf
Company

What we offer

  • ITDS Clubs
  • Access to medical insurance
  • Access to Multisport
  • Access to Pluralsight
  • Integrational Events
  • Ambassador Program

Benefits

  • sharing the costs of sports activities
  • private medical care
  • flexible working time
  • fruits
  • integration events
  • corporate gym
  • saving & investment scheme
  • no dress code
  • coffee / tea
  • drinks
  • christmas gifts
  • birthday celebration
  • sharing the costs of a streaming platform subscription
  • access to +100 projects
  • access to Pluralsight

Recruitment stages

  • 1.
    online interview
  • 2.
    online interview

ITDS Polska Sp. z o.o.

ITDS supports financial service providers to take the next steps.
We identify what’s possible, every day. Opportunities in the areas of technology, organization, and digitization.
We see where banks, insurers, payment companies, or fintech can go and how they can get there.
That’s why we want to stimulate you to ramp up your ambition. Forget what you perceive as restraints and step towards the new reality.
ITDS in Poland - Pure player in new Technologies & Financial Industry
+300 IT implementation professionals
+20 clients in the Banking, Insurance, Payment & Fintech Industry
ITDS excels in digital strategy delivery and implementation of best-of-breed lending solutions. ITDS has delivered successful strategic projects throughout Europe since 1998. We combine the experience we’ve accumulated with in-depth knowledge of technologies, business processes, and EU legislation to unlock new business opportunities.

This is how we work

Senior Fullstack Developer (.NET & React)
15k–18k zł / mth. (CoE), 18.9k–24.1k zł / mth. (B2B)
I apply to:
ITDS Polska Sp. z o.o.
Gdańsk, Pomeranian
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