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FX Senior Java Developer (f/m/x)
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Offer summary

(Summary generated by AI based on the full job description)

The project involves backend systems with high performance and scalability in the financial sector, focusing on microservices and large data processing. Key technologies include Java, Spring, REST API, Kubernetes, and GCP cloud. Responsibilities include designing and developing backend, building integrations, ensuring high availability and performance, participating in architecture decisions, and optimizing CI/CD processes. Knowledge of SQL databases and distributed systems is required.

new

FX Senior Java Developer (f/m/x)

Company: Sii Sp. z o.o.

from: 18 August 2026
to: 17 September 2026
salary not specifiedB2B contract
Offer parameters
level:senior
working mode:hybrid • full office
Kraków, Podgórze
Kraków, PodgórzeWadowicka 12View on map

Requirements

Expected technologies

Java
Spring Boot
REST
Microservices
SQL
Kubernetes

Optional technologies

Rust
NoSQL
ClickHouse
Google Cloud Platform
Kafka
Go

Our 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

Optional

  • 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

Your responsibilities

  • 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

About the project

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.

This is how we work on a project

  • Continuous Deployment
  • Continuous Integration
Company

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 – you can change them thanks to Job Changer application
  • 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

Recruitment stages

  • 1.
    Send your CV
  • 2.
    Talk to us about your expectations
  • 3.
    Learn more about our projects and choose the best
  • 4.
    Start your adventure with Sii!

Sii Sp. z o.o.

Sii is the leading technology consulting, digital transformation, engineering, and business services vendor in Poland. We already employ more than 7 300 professionals and implement projects in a variety of industries for clients from many countries around the world. The Great Place to Work title, won 10 times in a row, proves that at Sii, we create a friendly work environment.
Sii ensures that all employment-related decisions are made solely on the basis of qualifications and competencies. We are committed to equal treatment of all individuals, regardless of any protected characteristics, and promoting a diverse and inclusive work environment.

This is how we work

FX Senior Java Developer (f/m/x)
I apply to:
Sii Sp. z o.o.
Kraków, Podgórze
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