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Software Engineer III ( JS/TS)

5 days, 17 hours ago
Poland
Full-time
Mid Level
Full-stack Engineer
Software Development
AWS Azure CI/CD Docker GCP GitHub GraphQL JavaScript Kubernetes Playwright PostgreSQL Pytest Python React REST API Spinnaker Terraform TypeScript
Apply Now
OpenX

OpenX

OpenX is a global leader in digital and mobile advertising technology, fostering a fair and transparent value exchange between publishers and advertisers to maximize revenue across all screens.

Media
51-250
Founded 2007
$71M raised
View All Jobs 9

Description

  • Design and build high-quality, maintainable user interfaces using JavaScript/TypeScript and React.
  • Develop and maintain Python-based backend APIs that support frontend workflows and product capabilities.
  • Translate business rules, pricing logic, and data dependencies into intuitive user experiences and reliable API integrations.
  • Own features end-to-end from requirements and technical design through implementation, testing, rollout, and operational quality.
  • Write and maintain automated tests, including frontend and API-level tests where appropriate.
  • Collaborate closely with Product, UX, QA, and Engineering to deliver reliable product experiences for enterprise users.
  • Improve the usability, reliability, and maintainability of existing systems.
  • Contribute to technical direction, code quality, and engineering practices within the team.

Requirements

  • 4+ years of professional software engineering experience.
  • Experience building web applications with JavaScript or TypeScript.
  • Hands-on experience with React and modern frontend architecture.
  • Solid understanding of component-based development, state management, API integration, and frontend performance.
  • Experience designing and developing REST APIs or contributing to backend services, preferably in Python.
  • Practical understanding of databases and backend data flows.
  • Commitment to software quality, including writing automated tests where appropriate.
  • Strong ownership mindset and ability to collaborate effectively with Product, UX, QA, and Engineering.
  • Communicative Polish and English language skills.
  • Experience with advertising technology, marketing technology, digital media, marketplace platforms, financial workflows, or revenue-related systems is preferred.
  • Experience with GraphQL is preferred.
  • Experience with cloud-based systems such as Google Cloud Platform, AWS, or Azure is preferred.

Benefits

  • Employment contract with a gross monthly salary of 17,708–19,792 PLN or B2B at 147–164 PLN net hourly.
  • Annual performance bonus.
  • Private health care for you and your family.
  • Private life and travel insurance.
  • MultiKafeteria program.
  • Training access through LinkedIn Learning and tech workshops.
  • Holiday allowance and an additional paid day off.
  • Pension scheme (PPK from PZU).
  • Monthly work-from-home allowance plus a one-time home office setup payment.
  • Free parking lot and peer-to-peer recognition platform.

Interested in this position?

Apply directly on the company website

Apply Now

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