Java Software Engineer

*** ONLY FOR CANDIDATES BASED IN POLAND ***
Location: Poland (candidates based in Wrocław are preferred) | Type: B2B, Full-time | FinTech, Blockchain, AI
I'm currently looking for an experienced Java Backend Engineer ready to take on new challenges in their career!
My client is building the new operating system (O/S) for global finance. The company is growing fast, with $400B on the platform in 2025 and $1T in 2026. They are building "unified ledgers" with massive infrastructure (currently 20 million transactions per day, ready to scale up to 50 million). If you are looking for a challenging, greenfield/sandbox environment and working alongside experienced software engineers, this might be a role for you!
Senior Java Backend Engineer – Responsibilities:
Designing and developing scalable, high-performance financial applications;
Leading code reviews, technical decisions, and system architecture discussions;
Solve complex engineering challenges while maintaining coding best practices.
Senior Java Backend Engineer – Requirements:
6+ years of software development experience;
Strong coding expertise in Java and frameworks like Spring, Spring Boot;
Experience building messaging systems (MQ/JMS);
Hands-on experience in AWS cloud environment;
Knowledge of SQL, MongoDB, and scalable database structures;
Experience across the full software development lifecycle;
Experience working with microservices and Kubernetes (EKS)/Docker;
Bonus:
Experience with blockchain and/or AI is a huge plus!
JOB DETAILS:
Type: B2B
Work arrangement: Remote
Salary: Competitive (VAT not applicable, international invoice) + paid holidays
Join as a Backend Engineer and help build the future of fintech!
If you have any questions or you want to apply directly, email: a.sawa@ltharper.com

Work arrangement
Yes