Principal Machine Learning Systems Engineer

Role Description

We’re looking for a Principal Machine Learning Systems Engineer to architect and scale the AI agents facing platform. The team is evolving from a vector/semantic search platform into a full hybrid search capability and, ultimately, into Atlassian’s agentic retrieval layer — a system that dynamically generates query plans on the fly using graph-based orchestration rather than static, linear pipelines. You’ll own the technical direction of this evolution, ensuring high-quality results, low latency, high reliability, and cost efficiency as it serves both human users and AI agents at enterprise scale.

Qualifications

• 7+ years of experience as a software developer.
• Deep experience building and operating production search, ads, or recommendation systems at scale.
• Hands-on experience building GenAI systems — shipping agents, LLM-powered applications, or AI systems at scale.
• Expertise in hybrid search — building indexes that combine vector/semantic and full-text/lexical retrieval.

Requirements

• Expert-level with search platform, deep learning training/inference platform (preferred).
• Experience with at least one major vector database (pinecone, milvus, qdrant, turbopuffer, etc) (preferred).
• Experience with scaling and deploying Machine Learning models (preferred).

Benefits

• Health and wellbeing resources.
• Paid volunteer days.
• Wide range of perks and benefits designed to support you and your family.

Compensation

At Atlassian, we strive to design equitable, explainable, and competitive compensation programs. The baseline of our range is higher than that of the typical market range. Base pay within the range is determined by a candidate's skills, expertise, or experience. For this role, our current base pay ranges for new hires in each zone are:

• Zone A: $232,200 - $303,150
• Zone B: $209,700 - $273,775
• Zone C: $193,500 - $252,625

This role may also be eligible for benefits, bonuses, commissions, and equity. Please visit go.atlassian.com/payzones for more information on which locations are included in each of our geographic pay zones.

Company Description

At Atlassian, we're motivated by a common goal: to unleash the potential of every team. Our software products help teams all over the planet and our solutions are designed for all types of work. Team collaboration through our tools makes what may be impossible alone, possible together.

We believe that the unique contributions of all Atlassians create our success. To ensure that our products and culture continue to incorporate everyone's perspectives and experience, we never discriminate based on race, religion, national origin, gender identity or expression, sexual orientation, age, or marital, veteran, or disability status.

To provide you the best experience, we can support with accommodations or adjustments at any stage of the recruitment process. Simply inform our Recruitment team during your conversation with them.

To learn more about our culture and hiring process, visit go.atlassian.com/crh.