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Mailbox Load Balancing Software Engineer

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Microsoft Corporation

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Location:
China , Suzhou

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Category:
IT - Software Development

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Contract Type:
Not provided

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Salary:

Not provided
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Job Description:

The M365 Core Foundation team is at the heart of Microsoft 365’s infrastructure, powering mission-critical services that serve billions of users. We are seeking talents to help design and implement an intelligent ultra-large-scale Load Balancing system. This system will utilize machine learning, reinforcement learning, and LLMs to analyze the real-time system status data. It will make intelligent load balancing decisions to ensure optimal shard placement and system resource allocation with the highest efficiency and precision.

Job Responsibility:

  • Build a global optimization engine that generates placement plans (blueprint) to avoid hotspots based on resource constraints, move cost, and availability goals
  • Design and implement centralized algorithms to maximize the utilization of system throughput resources, ensuring swift mitigation of hotspots
  • Collaborate with distributed LB execution layers to coordinate plan rollout and shard migration
  • Partner with Performance, Capacity, Search and Copilot teams to align placement strategies with performance and SLA targets
  • Contribute to observability and debugging tools to ensure transparency and traceability of placement decisions

Requirements:

  • Bachelor's Degree in Computer Science or related technical field AND 2+ years technical engineering experience with coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, or Python OR equivalent experience
  • 3+ years of software development experience, including 2+ years in distributed systems or infrastructure
  • Solid coding skills in C#, C++, or Python
  • Experience with large-scale scheduling, optimization, or resource management systems
  • Familiarity with cloud platforms (Azure preferred) and telemetry pipelines
  • Experience applying ML models or leveraging LLMs to optimize decision-making is preferred
  • Excellent problem-solving and collaboration skills
  • Ability to meet Microsoft, customer and/or government security screening requirements are required for this role
  • This position will be required to pass the Microsoft Cloud background check upon hire/transfer and every two years thereafter

Nice to have:

  • Master's Degree in Computer Science or related technical field AND 3+ years technical engineering experience with coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, or Python OR Bachelor's Degree in Computer Science or related technical field AND 5+ years technical engineering experience with coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, or Python OR equivalent experience
  • Experience with telemetry systems and QoS metric analysis
  • Experience applying ML, RL, and LLMs to optimize decision-making

Additional Information:

Job Posted:
March 19, 2026

Employment Type:
Fulltime
Work Type:
Hybrid work
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