Senior Java Developer

Quick Facts

• Role: Senior Java Developer
• Location: Wrocław, Poland (Hybrid — 3 days/week onsite)
• Contract: B2B

Description

Join a team to design and enhance Java Spring Boot microservices and REST/GraphQL APIs for order and trade workflows across capture, validation, routing, execution, allocation, and booking. You will build event-driven integrations using Kafka and ActiveMQ, deliver AWS serverless solutions, and apply engineering best practices for secure, tested CI/CD. The role also includes adding GenAI/LLM capabilities using RAG and vector databases to improve order and trade processing.

Responsibilities

• Design, build, and enhance Java Spring Boot microservices and APIs across the order and trade lifecycle
• Build event-driven integrations for reliable real-time order and trade flows
• Develop AWS serverless systems with Lambda, API Gateway, S3, Step Functions, DynamoDB, and CloudFormation; manage PostgreSQL and MongoDB
• Apply clean code, CI/CD, secure SDLC, and automated testing with JUnit and Mockito
• Optimize performance for low-latency, high-throughput trading services
• Implement GenAI/LLM capabilities using RAG, vector databases, and Spring AI
• Collaborate with Product Owners, Architects, and engineers; participate in code reviews, testing strategies, and troubleshooting
• Apply DevOps practices such as monitoring, logging, and operational readiness
• Support modernization toward modular, cloud-native, event-driven architectures

Requirements

• Bachelor’s or Master’s degree in Computer Science, Engineering, or related field (or equivalent experience)
• 8+ years of hands-on Java software engineering experience in large-scale or complex environments
• Strong hands-on Java experience with Spring Boot microservices, Spring MVC, Spring Data
• Experience designing REST and GraphQL APIs
• Experience with Kafka and ActiveMQ; experience with PostgreSQL and MongoDB
• Experience with CI/CD and automated testing using JUnit and Mockito
• GenAI/LLM application development experience including RAG, vector databases, and Spring AI
• Ability to contribute hands-on to development and problem solving of complex technical challenges

Benefits

• Hybrid working model (3 days/week onsite)
• B2B contract