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Senior Java Developer – Risk Technology
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Offer summary

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

The project focuses on data processing systems supporting risk management at the enterprise level. Core technologies include Java, multi-threading, REST APIs, SQL, JVM performance. Responsibilities cover designing, developing and maintaining backend solutions, analyzing and optimizing application performance, collaborating with a global team, and participating in CI/CD and code reviews.

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Senior Java Developer – Risk Technology

Company: SQUARE ONE RESOURCES sp. z o.o.

from: 4 August 2026
to: 3 September 2026
160 - 190 złnet (+ VAT)/ hr.B2B contract
Offer parameters
level:senior • expert
working mode:remote
location:Warszawa, Masovian
Warszawa, Masovian

Requirements

Expected technologies

Java
Kafka
PostgreSQL
Oracle
Linux
Python
Docker
Kubernetes

Operating system

Linux

Our requirements

  • Strong professional experience with Java development.
  • Advanced knowledge of Java programming concepts and best practices.
  • Hands-on experience with multi-threading and concurrent programming.
  • Proven experience designing and developing Java REST APIs.
  • Experience building and maintaining large-scale, high-volume data processing systems.
  • Strong understanding of relational databases (RDBMS) and SQL.
  • Experience with JVM performance analysis and optimization.
  • Ability to troubleshoot and optimize backend application performance.

Optional

  • Experience with PostgreSQL.
  • Knowledge of Apache Kafka and event-driven architectures.
  • Experience with Oracle PL/SQL and SQL query optimization.
  • Knowledge of Linux Shell scripting.
  • Experience with Python scripting.
  • Exposure to functional programming concepts (e.g., Haskell).
  • Experience with Docker and Kubernetes (K8S).
  • Understanding of DevOps practices and CI/CD pipelines.

Your responsibilities

  • Translate business requirements into effective technical solutions.
  • Collaborate with business stakeholders and technical teams to deliver high-quality software.
  • Troubleshoot complex technical issues and optimize application performance.
  • Analyze and improve JVM performance and application scalability.
  • Ensure high code quality by applying software engineering best practices.
  • Participate in code reviews, CI/CD processes, and continuous improvement initiatives.
  • Work closely with distributed technology teams located across different regions.
  • Contribute to maintaining stable and reliable production environments.
  • Design, develop, and maintain enterprise applications based on Java technologies.
  • Develop new functionalities and improve existing application components.

About the project

We are looking for a Senior Java Developer to join a global Risk Technology team responsible for designing, developing, and maintaining high-performance data processing systems supporting risk management functions.
The role focuses on delivering strategic technology initiatives, developing new application capabilities, enhancing existing solutions, and ensuring the stability, scalability, and performance of enterprise-level platforms.
The successful candidate will collaborate with a global team of software engineers, architects, project managers, technical specialists, and business stakeholders to deliver robust and scalable technology solutions.
This position requires strong backend development expertise, experience with distributed systems, and the ability to work independently across the full software development lifecycle.

This is how we organize our work

This is how we work

at the client's site

This is how we work on a project

  • Continuous Deployment
  • Continuous Integration
Company

SQUARE ONE RESOURCES sp. z o.o.

At Square One Poland we link IT experts with the business. With over 25 years of experience, we specialize in recruitment processes on a global scale. Despite years of experience, we still have a startup DNA and this is our advantage. Our offices are located in London and Warsaw, however, we can reach clients from all over the world, from start-ups to big worldwide corporations.

This is how we work

Senior Java Developer – Risk Technology
160–190 zł / hr. (B2B)
I apply to:
SQUARE ONE RESOURCES sp. z o.o.
Warszawa, Masovian

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