Expert Fullstack Consultant (Java & React)
Job Description & Overview
Type of contract: B2B contract
Salary range: 155 - 205 PLN/H
What will you do?
You will work on large-scale financial services platforms supporting investment banking operations. The role focuses on digital transformation, process automation, data integration, and application modernization in a highly regulated environment. You will contribute across both backend and frontend development while leveraging modern cloud-native technologies, AI engineering tools, and DevOps practices.
Your tasks
- Design and develop scalable microservices-based applications using Java and Spring Boot
- Build and maintain modern frontend solutions using React and TypeScript
- Implement and optimize integrations with PostgreSQL and Kafka
- Collaborate with business stakeholders and development teams to deliver high-quality solutions
- Develop and maintain automated tests ensuring application quality and reliability
- Deploy and support applications running on Kubernetes platforms
- Create and maintain CI/CD pipelines using GitLab
- Participate in application modernization and process automation initiatives
- Contribute to technical discussions and architectural decisions
- Utilize AI engineering tools to improve development efficiency
Requirements
- Strong backend development experience using Java 17+ and Spring Boot 3+
- Experience designing and developing microservices-based architectures
- Good knowledge of PostgreSQL
- Good knowledge of Kafka
- Strong frontend development expertise using ReactJS, Redux, TypeScript, HTML5, CSS3 and modern JavaScript (ES6+)
- Experience with .NET and C#
- Experience with AI engineering tools such as GHCP CLI
- Understanding of Generative AI concepts and frontier models
- Strong communication skills
- Strong domain knowledge of Stock Borrow Loan business
- Experience with automated testing using JUnit 5, Mockito, Testcontainers or similar tools
- Understanding of structured context in codebases such as AGENTS.md and skills
- Practical knowledge of Kubernetes, Helm and Terraform
- Experience with GitLab CI/CD pipelines for build, test, packaging and deployment automation
- Openness to work hybrid from our client's office (Kraków) 3 days a week
Nice to have
- Splunk
- Grafana
- Application Insights
Ready to apply for this vacancy?
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Key Details
- Date Posted: 23 Oct 2026
- Location: United Kingdom
- Employment Type: Permanent
- Category: General
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