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GFT Technologies SE

Expert Fullstack Consultant (Java & React)

GFT Technologies SE Krakow, Lesser Poland Voivodeship, Poland · PLN 322K–PLN 426K/yr

IT Services and IT Consulting · 10,001+ employees

Sep 23
react Senior (5-10 yrs) Contractor Poland
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About the role

You will design and develop scalable microservices-based applications while contributing to digital transformation and process automation in a financial services environment. The role involves collaborating with stakeholders to deliver high-quality solutions using modern cloud-native technologies, AI engineering tools, and DevOps practices.

What they look for

Java Spring Boot React TypeScript PostgreSQL Kafka Kubernetes Terraform GitLab CI/CD Microservices Generative AI JUnit 5 Mockito Testcontainers Helm C#

Requirements

Candidates must have strong backend experience with Java 17+ and Spring Boot 3+, alongside frontend expertise in React, TypeScript, and Redux. Proficiency in microservices architecture, PostgreSQL, Kafka, and Kubernetes is required, along with experience in .NET and C#.

Full description

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

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