May 20, 2026

FX Senior Java Developer (f/m/x)

Senior • Hybrid

24,000 - 30,000 PLN

Krakow, Poland

We are looking for an experienced Senior Java Developer to join a team responsible for building and developing modern backend systems in a distributed environment. The projects involve high-performance and scalable solutions used in the financial sector, with a focus on processing large volumes of data and microservices architecture.

Your tasks

  • Designing and developing backend systems based on Java

  • Creating and evolving a microservices architecture

  • Building and maintaining REST APIs and system integrations

  • Designing solutions that meet high availability and performance requirements

  • Working with systems that process large volumes of data

  • Collaborating with the team using Agile methodologies

  • Participating in architecture design and technical decision-making

  • Implementing and optimizing CI/CD processes and ensuring system security

Requirements

  • Minimum 10 years in software development

  • Very good knowledge of Java (backend) and Spring

  • Strong understanding of REST APIs, HTTPS, microservices, and message queues (MQ)

  • Ability to design high-availability, scalable, and high-performance systems

  • Very good knowledge of relational databases (SQL)

  • Familiarity with CI/CD pipelines and Agile ways of working

  • Knowledge of distributed systems and data processing

  • Hands-on work with Kubernetes and cloud platforms (GCP preferred)

  • Fluent Polish and English required

  • Residing in Poland required

Nice-to-have requirements

  • Knowledge of Go, Rust, or similar system-level languages

  • Experience with NoSQL and analytical databases, e.g., ClickHouse

  • Frontend development experience

  • Familiarity with the banking sector (trade lifecycle, FX, post-trade processing)

  • Banking experience / FX experience (forex)

  • Working from the office in Krakow 6 times per month

What we offer 

  • Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas 

  • Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market 

  • We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 

  • Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more 

  • Comfortable workplace – class A offices or remote work 

  • Dozens of fascinating projects for prestigious brands from all over the world 

  • PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers 

  • Investment in your growth – meetups, webinars, training platform and technology blog – you choose 

  • Fantastic atmosphere created by all Sii Power People 

If you want to work on systems with high operational significance — apply now!

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