Principal Software Engineer

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.

We’re seeking a Principal Engineer with strong platform and cloud expertise to lead large-scale integrations and enhance the scalability and performance of our platform. You’ll join a talented team to design and develop real-time services, working closely with partner engineering and product teams to deliver secure and robust solutions.

An ideal candidate is:

Open-minded – Welcomes feedback, learns from failure, and adapts quickly to change.

Proactive – Takes initiative to identify problems and drive thoughtful, effective solutions.

Self-motivated & Organized – Manages priorities independently and follows through with clarity and accountability.

We are operating at a scale:

100% Cloud-based (GCP) platform

Over 400 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

• Employment contract (29 608 - 33 090 PLN gross/monthly)
• 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

• Lead the architecture and technical vision for platform integrations, ensuring high performance, security, and scalability.
• Design and build systems that enable partners to connect and operate real-time services efficiently and securely.
• Work with partner engineering and product teams to plan, build, and launch integrations that meet business and technical goals.
• Deliver critical platform features from design through implementation, testing, rollout, and adoption.
• Identify and address technical debt, performance bottlenecks, and scalability risks before they impact customers.
• Champion architectural patterns and platform capabilities that improve developer velocity and operational reliability.
• Promote engineering excellence through constructive code reviews, mentoring, and driving improvements in code quality, architecture, and platform best practices.

• 12 years of professional software development experience, with deep expertise in Java and/or Go (both preferred).
• Hands-on experience with a major cloud platform (GCP, AWS, or Azure) for designing and operating production workloads.
• Proven track record of delivering large-scale, high-performance, and reliable systems.Expertise in RESTful API design and scaling, including data modeling, error handling, performance optimization, and security best practices.
• Strong background in distributed systems, Kubernetes, and containerized services.
• Experience leading architecture and technical direction across multiple teams or product areas.
• Strong problem-solving skills, with the ability to anticipate and address scalability, reliability, and privacy challenges.
• Excellent collaboration and communication skills, with success working closely with product, partner engineering, and cross-functional stakeholders.
• Proven ability to mentor senior engineers and raise technical standards across an organization.

• Experience designing real-time, low-latency, large-scale data processing systems.
• Knowledge of programmatic advertising or other high-throughput transactional platforms.
• Familiarity with CI/CD pipelines, infrastructure as code (Terraform, Helm), and advanced monitoring/observability tools (e.g. Grafana).
• Proven ability to introduce architectural patterns that improve developer velocity and system reliability.
• Experience using AI-assisted development tools to enhance productivity.

• 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)

OpenX VALUES

Our five company values form a solid bedrock serving to define us as a group and guide the company. Our values remind us that how we do things often matters as much as what we do.

WE ARE ONE

We are one team. There are no exceptions. We are a group of strong and diverse individuals unified by a shared mission. We embrace challenges and win together as a team. We respect and care about our colleagues and cultivate an inclusive culture

WE ARE CUSTOMER CENTRIC

We innovate on behalf of our customers. We understand, respect, and listen carefully to our customers. We build great products to solve our customers’ problems. We manage our customers’ expectations clearly and honestly. We are a trusted partner to all of our customers - we act with integrity at all times. We care.

OPENX IS OURS

We are all owners of OpenX

We all have a voice to improve OpenX

We stake our personal and professional reputations on the excellence of our work

We are not interested in just "doing our jobs"; we take ownership to drive results

WE ARE AN OPEN BOOK

We understand and respect what each of us does. We are eager to teach and share what we know with others, both internally and externally. We are eager to learn from others and we ask questions internally and externally. 

WE EVOLVE FAST

We take responsible risks and own and learn from our mistakes. We recognize and repeat success. We actively seek out and provide constructive feedback. We adapt quickly and embrace change. We tackle growth and learning with real urgency. We are endlessly curious.

OpenX TRAITS

Our three traits capture what makes a great team member at OpenX.

HUMBLE

Ideal team players are humble and demonstrate integrity. They put the team's success above their own, share credit generously, and value collective achievements. They are self-assured, open to coaching, and committed to continuous learning.

DRIVEN

Ideal team players are results-driven and motivated. They are curious, always seeking more to do, learn, and take on. As proactive problem-solvers, they take initiative without needing external motivation. They continuously think about the next steps and opportunities for improvement.

SMART

Ideal team players are smart and possess the intellectual acumen to understand the complexities of our organization and industry. They are interpersonally intelligent, good communicators, and exemplify sound judgment in their interactions across the company to foster a collaborative environment.

OpenX is committed to equal employment opportunities.

It is a fundamental principle at OpenX not to discriminate against employees or applicants for employment on any legally-recognized basis including, but not limited to: age, race, creed, color, religion, national origin, sexual orientation, sex, disability, predisposing genetic characteristics, genetic information, military or veteran status, marital status, gender identity/transgender status, pregnancy, childbirth or related medical condition, and other protected characteristic as established by law.

OpenX Applicant Privacy Policy

Applicants can review our Applicant Privacy Policy at any time by visiting the following link: https://www.openx.com/privacy-center/applicant-privacy-policy/.

Effective Date of the Privacy Policy: November 21, 2024