Senior Fullstack Consultant (Java & React)

Type of contract: B2B contract

Salary range: 125 - 160 PLN/H

What will you do?

You will work on large-scale financial services platforms supporting investment banking operations and digital transformation initiatives in a highly regulated environment. The role combines frontend and backend development, cloud-native engineering, and collaboration with business and technology stakeholders to deliver scalable, resilient, and high-performing solutions.

Your tasks

- Design and develop enterprise-grade frontend applications using React and TypeScript

- Build and maintain backend services based on Java, Spring Boot, and microservices architecture

- Develop and support cloud-native solutions deployed on Kubernetes platforms

- Design and implement event-driven integrations using Apache Kafka

- Create and maintain CI/CD pipelines in GitLab

- Collaborate with business stakeholders, architects, and cross-functional Agile teams

- Optimize application performance, scalability, and reliability

- Contribute to technical design, code reviews, and engineering best practices

- Support application modernization and process automation initiatives

Requirements

- 7+ years of professional software development experience in enterprise environments

- Strong expertise in ReactJS, Redux, TypeScript, HTML5, CSS3, and modern JavaScript

- Deep understanding of React Hooks, Context API, Redux Toolkit, routing, and frontend performance optimization

- Hands-on experience with Vite and/or Webpack

- Strong experience with Java 17+ and Spring Boot 3+

- Experience with Spring Security, Spring Data JPA, REST APIs, and microservices

- Excellent knowledge of multithreading, concurrency, JVM tuning, and performance optimization

- Practical experience with Apache Kafka and event-driven architectures

- Experience with Kubernetes, Helm, and Terraform

- Experience creating and maintaining GitLab CI/CD pipelines

- Strong understanding of distributed systems, scalability, resiliency, and fault tolerance

- Knowledge of SOLID principles, design patterns, clean architecture, TDD, and secure coding practices

- Strong communication and collaboration skills

- Experience working in Agile/Scrum environments

- Openness to work hybrid from our clint's office (Kraków) 3 days a week

Nice to have

- Experience with AI-assisted development tools such as GitHub Copilot or Microsoft Copilot

- Experience with Oracle or PostgreSQL databases

- Familiarity with Azure cloud services

- Knowledge of Grafana, Prometheus, Splunk, Dynatrace, ELK, or OpenSearch

- Experience with OpenAPI/Swagger and GraphQL

- Strong testing background using JUnit 5, Mockito, TestContainers, Playwright, Cypress, or React Testing Library

- Experience mentoring developers and contributing to engineering standards and architecture decisions