Senior Full-Stack Engineer (Java and React)

EPAM Systems; Wrocław; On-site; PLN 220,000 - 340,000; Full time

Job summary

EPAM Systems, Inc. is seeking a Senior Full-Stack Engineer to design and deliver scalable backend services in Java and microservices while contributing to modern frontend in React.

The role emphasizes hybrid work with three days per week onsite in Kraków or Wrocław, Poland, and requires strong financial services domain experience. You will collaborate with cross-functional teams to implement event-driven architectures using Kafka, manage data with PostgreSQL, and apply AI-assisted development to

Qualifications

• 7+ years of backend development with Java 17+ and Spring Boot 3+.
• Proficiency in ReactJS, Redux, and TypeScript.
• Strong knowledge of PostgreSQL and Kafka.
• Experience with automated testing (JUnit 5, Mockito, Testcontainers).
• Familiarity with AI engineering tools (GHCP CLI) and Generative AI concepts.
• English communication at B2 level or higher.
• Nice to have exposure to .NET/C# and cloud-native stacks.

Responsibilities

• Design and develop scalable backend services using Java, Spring Boot, and microservices-based architectures
• Build and maintain modern front-end applications using ReactJS and related technologies
• Deliver end-to-end platform features across enterprise banking and financial services environments
• Implement event-driven solutions leveraging Kafka and integrate with PostgreSQL databases
• Apply AI-assisted development practices to improve productivity and code quality
• Develop and maintain automated tests to ensure reliability and quality of the codebase
• Collaborate with cross-functional teams to define, design, and ship new features
• Contribute to architectural decisions and promote best practices in software engineering
• Ensure solutions align with the complexities of financial ecosystems and business requirements

Skills

Java 17+

Spring Boot 3+

Microservices

ReactJS

TypeScript

PostgreSQL

Kafka

JUnit 5

Testcontainers

Kubernetes

GitLab CI/CD

AI tooling (GHCP CLI)

Tools

Kubernetes

Helm

Terraform

GitLab CI/CD

Splunk

Grafana

App Insights

Testcontainers

GHCP CLI

Job description

We are seeking a Senior Full-Stack Engineer with strong expertise in Java, Spring Boot, Kafka, microservices, and modern software architecture to deliver scalable solutions across enterprise banking and financial services environments. The ideal candidate brings valuable Financial Services experience spanning Investment Banking, Commercial Banking, Digital Banking, Asset Management, and financial messaging platforms, providing a strong understanding of complex financial ecosystems. This role combines solid backend engineering capabilities with cloud-native experience, AI-assisted development practices, and exposure to React-based frontend technologies, enabling effective contribution to end-to-end platform development. This role offers a hybrid model, with 3 days per week working from the client's office in Kraków or Wrocław, Poland.

Responsibilities

• Design and develop scalable backend services using Java, Spring Boot, and microservices-based architectures
• Build and maintain modern, responsive front-end applications using ReactJS and related technologies
• Deliver end-to-end platform features across enterprise banking and financial services environments
• Implement event-driven solutions leveraging Kafka and integrate with PostgreSQL databases
• Apply AI-assisted development practices to improve productivity and code quality
• Develop and maintain automated tests to ensure reliability and quality of the codebase
• Collaborate with cross-functional teams to define, design, and ship new features
• Contribute to architectural decisions and promote best practices in software engineering
• Ensure solutions align with the complexities of financial ecosystems and business requirements

Requirements

• 7+ years of backend development experience with Java 17+, Spring Boot 3+, and microservices-based architectures
• Proficiency in ReactJS, Redux, and TypeScript
• Skills in HTML5, CSS3, and modern JavaScript (ES6+)
• Knowledge of PostgreSQL and Kafka
• Background in automated testing using JUnit 5, Mockito, Testcontainers, or similar tools
• Familiarity with AI engineering tools such as GHCP CLI
• Understanding of Generative AI concepts and capabilities (frontier models)
• Strong English communication skills (B2 level or higher)
• Nice to have Exposure to .NET and C#
• Familiarity with Splunk, Grafana, and App Insights
• Practical knowledge of Kubernetes, Helm, and Terraform
• Experience with GitLab CI/CD pipelines for build, test, packaging, and deployment automation
• Strong domain understanding of the Stock Borrow Loan business, including structured context in codebases (AGENTS.md, skills)