Principal Software Engineer, Ads Infrastructure

Principal Software Engineer, Ads Infrastructure
San Francisco, CA, USA

$250K - $340K

The opportunity
The Ads Infrastructure team at Unity builds and operates the core distributed systems that power one of the largest real time advertising platforms in the world. Our infrastructure underpins every part of Unity Ads, providing the foundation for segmentation, optimization, bidding, traffic routing, experimentation, and analytics at global scale.

We focus on resilient, scalable, and cost efficient systems that process massive traffic volumes across regions with strict latency and availability requirements. The platform is built on technologies such as Kubernetes, Kafka, Flink, Starrocks, Valkey, and other cloud native components, and supports the engineers, data scientists, and product teams that drive Unity Ads forward.

This is a senior individual contributor role with organization wide technical impact. You will own critical architectural decisions, drive long term platform evolution, and partner with the team, senior managers and directors to define the technical direction of Ads Infrastructure while remaining deeply hands on.

What you’ll be doing

Define and guide the architecture and design of large scale distributed systems, ensuring scalability, fault tolerance, cost efficiency, and long term maintainability across multi region deployments

Take end to end ownership of critical infrastructure domains, operating services in production, participating in on call rotations, and leading deep root cause analysis of complex cross system incidents

Drive operational excellence by establishing SLO frameworks, advancing observability and resiliency patterns, and automating reliability and capacity management across the platform

Elevate engineering standards through rigorous design reviews, architectural alignment, performance benchmarking, and mentorship of senior and staff engineers

Partner with leadership on long term infrastructure strategy, including capacity planning, cost optimization, and technical input to cloud vendor negotiation.

What we’re looking for

10 or more years of experience designing, building, and operating large scale distributed systems in high availability production environments

Strong programming expertise with a track record of delivering production grade backend services and infrastructure systems

Deep hands on experience with Kubernetes and cloud native architectures in GCP, AWS, or Azure, including multi cluster and multi region patterns

Advanced expertise in distributed infrastructure including traffic management, load balancing, networking, messaging systems such as Kafka, and large scale stream or batch data processing

You might also have

Deep expertise in distributed caching, storage engines, or stateful systems supporting low latency global workloads

Experience designing service mesh, routing, and service discovery architectures in large scale environments

Domain knowledge of online advertising and adtech systems operating at real time bidding scale

Strong theoretical and practical understanding of distributed systems concepts including replication, partitioning, consistency models, failure handling, and end to end performance optimization

Additional information

Relocation support is not available for this position

Work visa/immigration sponsorship is not available for this position

Benefits
At Unity, we offer a wide range of benefits designed to support well-being and work-life balance. Comprehensive health, life, and disability insurance, Commute subsidy, Employee stock ownership, Competitive retirement/pension plans, Generous vacation and personal days, Support for new parents through leave and family-care programs, Office food snacks, Mental Health and Wellbeing programs and support, Employee Resource Groups, Global Employee Assistance Program, Training and development programs, Volunteering and donation matching program.

Unity is a proud equal opportunity employer. We are committed to fostering an inclusive, innovative environment and celebrate our employees across age, race, color, ancestry, national origin, religion, disability, sex, gender identity or expression, sexual orientation, or any other protected status in accordance with applicable law. Our differences are strengths that enable us to support the growing and evolving needs of our customers, partners, and collaborators. If you have a disability that means there are preparations or accommodations we can make to help ensure you have a comfortable and positive interview experience, please fill out this form to let us know.

Pursuant to the San Francisco Fair Chance Ordinance, we will consider for employment qualified applicants with arrest and conviction records.

This position requires the incumbent to have a sufficient knowledge of English to have professional verbal and written exchanges in this language since the performance of the duties related to this position requires frequent and regular communication with colleagues and partners located worldwide and whose common language is English.

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