Senior Java Developer

Job Title: Senior Java Developer

Location: Wroclaw, Poland (Hybrid - 3 days in a week to onsite)

Job Type: B2B Contract

Exp level: 10+ yrs

Your role Are you a strong software engineer who combines technical depth with a passion for building high quality, scalable solutions? Do you thrive in a fast paced environment where you can contribute to both engineering excellence and delivery outcomes?

Key responsibilities will be to

• Design, build, and enhance Java Spring Boot microservices and REST and GraphQL APIs across the order and trade lifecycle, including order capture, validation, routing, execution, allocation, and booking.
• Build event‑driven integrations using Kafka and ActiveMQ to deliver reliable, real‑time order and trade flows.
• Develop AWS serverless solutions using Lambda, API Gateway, S3, Step Functions, DynamoDB, and CloudFormation, and manage data on PostgreSQL and MongoDB.
• Apply engineering best practices, including clean code, CI/CD, secure SDLC, and automated testing with JUnit and Mockito.
• Optimize the performance of low‑latency, high‑throughput services, contributing to resilient and scalable trading systems.
• Build GenAI and LLM capabilities using retrieval‑augmented generation (RAG), vector databases, and Spring AI to enhance order and trade workflows.
• Collaborate closely with Product Owners, Architects, and engineers, and contribute to code reviews, testing strategies, and trouble shooting of complex technical issues.
• Apply DevOps practices, including monitoring, logging, and operational readiness in delivered solutions.
• Support modernization efforts by helping evolve legacy systems toward modular, cloud‑native, and event‑driven architectures.

Your expertise

Software engineering & technical skills

• Strong hands‑on experience in Java, building scalable microservices with Spring Boot, Spring MVC, and Spring Data, and designing REST and GraphQL APIs.
• Experience with event‑driven messaging using Kafka and ActiveMQ, and with data stores such as PostgreSQL and MongoDB.
• Experience delivering through CI/CD pipelines with automated testing using JUnit and Mockito, and applying performance optimization, reliability, and secure development practices to low‑latency, high‑throughput services.
• Hands‑on experience with GenAI/LLM application development, including RAG, vector databases and Spring AI.
• Ability to contribute hands‑on to development and problem solving of complex technical challenges.

Collaboration & delivery

• Experience working in Agile delivery models.
• Strong collaboration skills across engineering, product, and architecture teams.
• Ability to communicate technical concepts effectively with both technical and non‑technical stakeholders.

Qualifications

• Bachelor’s or Master’s degree in Computer Science, Engineering, or a related field (or equivalent experience).
• 8+ years of hands‑on Java software engineering experience within large‑scale or complex environments.

Nice to have

• Exposure to order management, trade execution, or trading platforms in financial services or wealth management.
• Experience contributing to engineering standards, best practices, or shared components.