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Senior Fullstack .NET Developer with React Expertise
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Offer summary

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

The project involves modernizing a business process management platform for a financial institution, including migrating legacy apps from .NET Framework to modern .NET and deploying in Kubernetes. Responsibilities include backend development in .NET and C#, frontend with React, automated testing, collaboration with LLM tools (Claude, Codex), and managing Kubernetes deployments. Required experience covers Docker, MS SQL, Git, JIRA, and TeamCity.

you can start ASAP

Senior Fullstack .NET Developer with React Expertise

Company: ITDS Polska Sp. z o.o.

from: 2 June 2026
to: 2 July 2026
20 160 - 21 840 złnet (+ VAT)/ mth.B2B contract (full-time)
15 000 - 16 000 złgross/ mth.contract of employment
Offer parameters
level:senior
working mode:hybrid
location:Łódź, Łódź
Łódź, Łódź

Requirements

Expected technologies

C#
.NET
React.js
Docker
Kubernetes
Microsoft SQL Server
Git
Jira
TeamCity
Claude Code
Codex

Optional technologies

RabbitMQ

Operating system

Windows

Our requirements

  • At least 5 years of experience in software development using C# and .NET
  • Experience with .NET Framework and modernizing legacy code
  • Good knowledge of React
  • Practical experience working with LLM tools such as Claude and Codex
  • Strong experience with automated testing
  • Hands on experience with Docker and Kubernetes
  • Experience designing and implementing enterprise applications
  • Strong knowledge of MS SQL
  • Experience using Git, JIRA, and TeamCity
  • Ability to work independently while collaborating effectively within a team
  • English skills sufficient to write and understand technical documentation
  • Fluency in Polish

Optional

  • Knowledge of message brokers, especially RabbitMQ

Your responsibilities

  • Develop and maintain backend services using .NET and C#
  • Rebuild legacy applications from .NET Framework to modern .NET architecture
  • Design and implement frontend components using React
  • Create and maintain automated unit and regression tests
  • Collaborate with business stakeholders to analyze and refine requirements
  • Design scalable and maintainable software solutions
  • Integrate applications with databases and external services
  • Utilize LLM-based tools such as Claude and Codex to support software development activities
  • Participate in code reviews and ensure adherence to development standards
  • Deploy and support applications running in Kubernetes environments
  • Work closely with cross-functional teams in an Agile delivery model

About the project

As a Senior Fullstack .NET Developer (React), you will be working for our client, a leading financial institution focused on delivering innovative digital banking solutions. You will join a strategic modernization initiative involving the redevelopment of a business process management platform. The project focuses on rebuilding legacy applications from .NET Framework to modern .NET technologies, migrating infrastructure from on-premises environments to Kubernetes, and implementing high-quality engineering practices. You will collaborate closely with AI-powered development tools, contribute to system design decisions, and help deliver scalable, secure, and maintainable solutions in a complex enterprise environment.
Unleash innovative web solutions — shape the future of digital banking experiences!
Łódź-based opportunity with hybrid work model (2 days in the office/month).
Only candidates with an existing legal right to work in the European Union will be considered for this role.

This is how we organize our work

This is how we work

at the client's siteagilescrum

#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

  • 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

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 .NET Developer with React Expertise
15k–16k zł / mth. (CoE), 20.2k–21.8k zł / mth. (B2B)
I apply to:
ITDS Polska Sp. z o.o.
Łódź, Łódź
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