Software Development Engineer in Test II

Confirmed live in the last 24 hours

OpenX

Krakow

On-site

Posted April 16, 2026

Job Description

Company at a Glance

OpenX is focused on unleashing the full economic potential of digital media companies. We do this by making digital advertising markets and technologies that are designed to deliver optimal value to publishers and advertisers on every ad served across all screens.

At OpenX, we have built a team that is uniquely experienced in designing and operating high-scale ad marketplaces, and we are constantly on the lookout for thoughtful, creative executors who are as fascinated as we are about finding new ways to apply a blend of market design, technical innovation, operational excellence, and empathetic partner service to the frontiers of digital advertising.

At OpenX Poland, we’re looking for talented and curious engineers to join our amazing team in Cracow, Poland. Currently, we’re looking for a Software development Engineer II - Test who will join our Full-stack team.

The team is using the following technologies:
Frontend: JS/TS, React, Material UI
API: Python
Backend: Java, Go, Erlang, Elixir
CICD: Cloudbuild, Spinnaker

On daily basis, we are using the Scrum framework with an open-minded attitude to adapt the process to our needs.
Within the team, you will have the opportunity to work closely with other SDETs focusing on different domains (both frontend and backend), as well as be a part of the QA Guild focusing on making impactful changes to our tools and processes.

We are operating at a scale:

100% Cloud-based (GCP) platform

Over 380 billion Ad requests every day

Over 120 000 CPU daily

Over 140 TB RAM daily

Over 50 PB of data per week

Over 1200 production deployments a month

reactpythonjavagogcpaifrontendbackenddataproduct