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ELEKS Logo ELEKS · IT - Software Development

Senior Software Developer (C++)

Poland · Job Posted May 10, 2026
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Job Description

ELEKS Software Engineering and Development Office is looking for a Senior C++ Developer in Ukraine, Poland or Croatia. Our client is a well-established software company specializing in productivity and creative tools, with millions of users worldwide across both Windows and macOS platforms. They are undergoing a strategic modernization of their licensing and revenue infrastructure, moving toward a cloud-connected, identity-driven architecture to better support their growing user base and subscription business model.

Job Responsibility

  • Modernize and rearchitect the integration layer between desktop applications and the internal licensing service across Windows and macOS
  • Implement and maintain integrations with Auth0 as an Identity Provider using OAuth 2.0 and OpenID Connect (OIDC) protocols
  • Write, refactor, and optimize C++ code in line with technical specifications, team conventions, and industry best practices
  • Collaborate within an Agile team: participate in sprint planning, code reviews, and retrospectives
  • Analyze and improve software quality including readability, maintainability, and runtime performance
  • Reproduce and resolve defects logged in the issue tracking system
  • identify root causes and implement targeted fixes
  • Use Git for version control: manage branching, merging, commits, and change history in accordance with team standards

Requirements

  • 5-7 years of professional software development experience
  • Strong proficiency in C++ (11/14/17), STL, and Qt framework
  • Hands-on experience with unit testing using gtest and development in VS
  • Solid understanding and practical use of Git for version control
  • Experience in multi-threaded programming and concurrent system design
  • Familiarity with network protocols and building networked desktop applications
  • Upper-Intermediate or higher English proficiency (written and verbal)

Nice to have

  • Experience with C# – particularly useful for Windows-side licensing and identity integrations
  • Experience with Objective-C and/or Swift – particularly useful for macOS-side integrations
  • Prior exposure to identity and access management concepts: OAuth 2.0, OpenID Connect (OIDC), JWT tokens, SSO, and identity providers such as Auth0
  • Experience working on cross-platform desktop applications (Windows + macOS)
  • Familiarity with subscription-based or cloud-connected software licensing models

What we offer

  • Close cooperation with a customer
  • Challenging tasks
  • Competence development
  • Ability to influence project technologies
  • Team of professionals
  • Dynamic environment with low level of bureaucracy
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