About the role
You will join the Core Exchange development team at OpenX. Our exchange handles billions of ad requests every day, connecting thousands of publishers with demand partners across the global advertising ecosystem. The platform runs in the cloud across multiple regions and operates at a scale where performance, reliability, correctness, and every millisecond matter.
The role focuses on building tools and workflows that help users manage advertising transactions. These tools help users configure business rules, review transaction setup, and keep platform behavior aligned with business agreements and financial processes.
This is a frontend-first engineering role with meaningful API ownership. Most of your work will focus on building high-quality user interfaces in TypeScript, primarily with React, while also contributing to Python-based APIs that support the product experience end-to-end. In practice, we expect the work to be roughly two-thirds frontend development and one-third API/backend development.
Prior AdTech experience is helpful, but not required.
Team setup
You will join a cross-functional product engineering team with a dedicated Product Manager, Scrum Master, Engineering Manager, QA engineers, frontend and backend engineers, and regular collaboration with UX designers. This setup gives engineers direct access to product context and a real opportunity to influence both technical and user-facing decisions.
What we offer:
- Employment contract (17 708 - 19 792 PLN gross/monthly) OR B2B (147 - 164 PLN net/hourly)
- Working with the newest technologies such as Cloud Computing (GCP)
- Challenges at work that are difficult to find anywhere else!
- Solving important problems in a scale
- Joining a company that is growing and scaling
- Flexible working hours & remote work option
Key responsibilities:
- 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 as part of the development process, 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.
Required Qualifications:
- 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 languages.
Desired Characteristics:
- Experience with advertising technology, marketing technology, digital media, marketplace platforms, financial workflows, or revenue-related systems.
- Experience with GraphQL.
- Experience with cloud-based systems such as Google Cloud Platform, AWS, or Azure.
Technologies you will work with:
- Frontend: TypeScript, React, single-page applications, React Testing Library.
- API/backend: Python, REST APIs.
- Testing: Playwright, pytest.
- Data and infrastructure: PostgreSQL, Google Cloud Platform (GCP), Docker, Kubernetes, Terraform.
- Delivery: CI/CD, Cloud Build, Spinnaker.
- Tooling: modern AI-assisted development tools.
- Collaboration: GitHub, code reviews, engineering communities of practice.
Our benefits (on employment contract):
- Annual performance bonus
- Tax-deductible system due to copyright protection: 75%
- Private health care for you and your family (covered by OpenX)
- Private life and travel insurance
- MultiKafeteria program
- Training: access to the LinkedIn learning platform and Tech workshops
- Holiday Allowance
- Pension scheme (PPK from PZU)
- Additional paid day off
- Free parking lot
- Access to peer to peer recognition platform
- Monthly work-from-home allowance and one-time payment when you join us to help you set up your home office
- We celebrate team members' important personal milestones (vouchers, gifts)
Skills Required
- 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
- Communicative Polish and English languages
What the Team is Saying
OpenX Technologies Compensation & Benefits Highlights
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Healthcare Strength — Company materials describe competitive medical, dental and vision coverage, employer‑paid therapy and life coaching, and wellness stipends. Mental‑health programs are emphasized alongside core healthcare as part of a holistic package.
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Parental & Family Support — Company communications highlight fully paid parental leave for birthing, non‑birthing, and adoptive parents, plus family‑formation and caregiving support. Day‑one eligibility and fertility options in public listings reinforce a family‑friendly design.
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Leave & Time Off Breadth — Public listings describe unlimited or flexible PTO, extended holidays, company‑wide recharge days, and birthday time off. Remote‑friendly scheduling is positioned to make time‑off policies practical in day‑to‑day use.
OpenX Technologies Insights
What We Do
OpenX is The Intelligent SSP™ (supply-side platform), simplifying advertising for marketers, advertisers, and publishers worldwide. As one of the largest SSPs globally, OpenX combines the industry’s only fully cloud-based infrastructure with leading AI capabilities to make digital advertising easier and more effective across every format, including CTV. Built to responsibly deliver quality, performance, and adaptability, OpenX makes digital advertising safer, smarter, and built for what’s next. Learn more at www.openx.com.
Why Work With Us
At OpenX, we value curiosity, innovation, and diversity. We are passionate about pushing the boundaries of ad tech and finding new ways to deliver value to our partners and we know our best chance of delivering is by creating diverse and inclusive teams where employees can do their best work being their authentic selves.
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OpenX Technologies Offices
Hybrid Workspace
Employees engage in a combination of remote and on-site work.
