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

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

Project involves development and cloud transformation of a business-critical platform for a global energy and maritime leader. Key stack includes Java, Python, React.js, Node.js and Golang, and cloud platforms GCP and AWS. Responsibilities cover ownership of complex solutions and pipelines, setting up cloud environment in GCP, IaC with Terraform and Ansible, CI/CD with GitHub Actions and maintaining Jenkins, plus exploring data streaming (Kafka/RabbitMQ). Requires minimum 5 years as Full-stack Java Developer and advanced English.

new

Senior Java Developer (f/m/x)

Company: Sii Sp. z o.o.

from: 13 October 2026
to: 12 November 2026
salary not specifiedB2B contract (full-time)
salary not specifiedcontract of employment
Offer parameters
level:senior
working mode:remote • hybrid • full office
Białystok, Centrum
Białystok, CentrumJózefa Marjańskiego 3View on map

Requirements

Expected technologies

Java
React.js
Node.js
Python
Go
Google Cloud Platform

Optional technologies

Apache Kafka
RabbitMQ

Our requirements

  • Minimum 5 years of experience as a Full-stack Java Developer
  • Strong expertise in Java, Python, React.js, Node.js, and Golang
  • Experience with cloud platforms, specifically GCP and AWS
  • Familiarity with Infrastructure as Code (IaC) automation and scripting tools such as Terraform, Ansible
  • Proficient in using GitHub and CI/CD practices
  • Advanced level of English

Optional

  • Experience with data streaming solutions like Apache Kafka or RabbitMQ
  • Knowledge of power systems, edge computing, or IoT
  • Familiarity with hardware or bare metal solutions

Your responsibilities

  • Taking ownership of complex custom software solutions and development pipelines
  • Setting up a cloud-based environment in GCP for development, build, and deployment
  • Collaborating with a team of developers to enhance and maintain the existing solution
  • Utilizing modern technologies, including Java, Python, React.js, Node.js, and Golang
  • Implementing Infrastructure as Code (IaC) automation using tools such as Terraform and Ansible
  • Working with version control systems like GitHub and CI/CD tools like GitHub Actions
  • Maintaining legacy pipelines in Jenkins as needed
  • Exploring opportunities for integrating data streaming solutions such as Kafka or RabbitMQ

About the project

Join an international team taking ownership of a complex business-critical software platform for a global leader in the energy and maritime industry. As a Senior Software Engineer, you will help drive the platform’s future development, contribute to cloud transformation initiatives, and tackle challenging engineering problems using modern technologies and development practices. This role offers the opportunity to work across software development, cloud, and platform engineering while making a real impact on the product's evolution.

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

Senior Java Developer (f/m/x)
I apply to:
Sii Sp. z o.o.
Białystok, Centrum
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