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Added 7 mins ago
Integration Manager, SME
Chenega Corporation
Ft Belvoir, VA
…across Agile Release Trains (ARTs), product teams, external systems, and mission…
Added 7 mins ago
Principal Platform Engineer – EIP / CCaaS
Navy Federal Credit Union
Vienna, VA
The Principal Platform Engineer – Experience Interaction Platform (EIP) / Contact Center as a Service (CCaaS) will serve as a senior technical leader responsible for engineering,…
Added 8 mins ago
Structural Engineer (Engineer IV)
FAIRFAX COUNTY
Fairfax, VA
…(FMD) is seeking a skilled and forward-thinking structural engineer to lead large scale and complex capital and non-capital projects in occupied county spaces. This is an exciting…
Added 9 mins ago
EG
Dev Lead
Eliassen Group
Richmond, VA
- $110 to $120 USD / hour
2+ years as a senior or principal engineer with design, implementation, and operational ownership.
Added 29 mins ago
Principal Engineer I - System Design / Architecture Engineering
Toyota
Liberty, NC
…Department is seeking a highly motivated Infrastructure / Platform Engineer to support the implementation, reliability, and operational excellence of infrastructure and platform…
Added 31 mins ago
EG
Dev Lead
Eliassen Group
Raleigh, NC
- $110 to $120 USD / hour
2+ years as a senior or principal engineer with design, implementation, and operational ownership.
Added 41 mins ago
O
Principal Data Center Operator
Oracle
United States
- $91,400 to $187,000 USD / year
Oracle Data Center Management & Operations (DCMO) has an opportunity for a Principal Data Center Operator who will be responsible for a wide variety of support and escalation across Data…
Added 53 mins ago
Cable Design & Specification Engineer
US0767 Prysmian Cables and Systems Usa LLC
Willimantic, CT
Prysmian is seeking a technically strong, detail-oriented engineer with a passion for collaboration and continuous improvement to join our Specialties, Industrial & Construction design team.
Added 53 mins ago
EG
Dev Lead
Eliassen Group
Hartford, CT
- $110 to $120 USD / hour
2+ years as a senior or principal engineer with design, implementation, and operational ownership.
Added 1 hour ago
EG
Dev Lead
Eliassen Group
Madison, WI
- $110 to $120 USD / hour
2+ years as a senior or principal engineer with design, implementation, and operational ownership.
Added 1 hour ago
Principal or Sr. Principal Engineer Electronics - Weapons Responsible Engineer
Northrop Grumman
Oklahoma City, OK
Northrop Grumman’s Aeronautics Systems sector is seeking a Principal or Sr. Principal Engineer Electronics - Weapons Responsible Engineer . This onsite position can e performed in Oklahoma…
Added 1 hour ago
Principal Mechanical Engineer/Sr. Principal Mechanical Engineer
Northrop Grumman
Oklahoma City, OK
Advanced Test and Support Systems (ATSS) is seeking a Principle Mechanical Engineer / Senior Principle Mechanical Engineer (Level 3/4) to join our team of qualified and diverse individuals…
Added 1 hour ago
EG
Dev Lead
Eliassen Group
Oklahoma City, OK
- $110 to $120 USD / hour
2+ years as a senior or principal engineer with design, implementation, and operational ownership.
Added 1 hour ago
M
Principal Software Engineer - CTJ - Poly
Microsoft
VA · Reston, VA · Reston
- $142,800 to $304,200 USD / year
Join the Azure AI Platform air-gapped engineering team as a Principal Software Engineer and help shape how Microsoft delivers and operates advanced AI capabilities for some of its most…
Added 1 hour ago
M
Principal Software Engineer
Microsoft
WA · Redmond, WA · Redmond
- $142,800 to $304,200 USD / year
We are looking for a Principal Software Engineer who lives and breathes Azure Cosmos DB and knows how it is implemented underneath. Your mission is to make throttling disappear from…
Added 1 hour ago
Principal Threat Detection Operations Engineer
Target
Brooklyn Park, MN
As a Principal Engineer supporting Threat Detection Operations, you set the technical strategy for the detection engineering, platforms, services, integrations, and automations that enable…
Added 1 hour ago
EG
Dev Lead
Eliassen Group
Saint Paul, MN
- $110 to $120 USD / hour
2+ years as a senior or principal engineer with design, implementation, and operational ownership.
Added 1 hour ago
Sentinel Principal / Sr Principal Engineer Industrial 17263 Secret Clearance
Northrop Grumman
Roy, UT
Northrop Grumman is seeking a Principal / Sr Principal Engineer Industrial
Added 1 hour ago
Sentinel - Principal Material Process Engineer
Northrop Grumman
Roy, UT
Northrop Grumman Defense Systems is seeking a Principal Mechanical Engineer to join our team. This position will be located at Roy, UT to support the Sentinel (GBSD) program in the…
Added 1 hour ago
Principal/Sr Principal Engineer Systems
Northrop Grumman
Roy, UT
Ensure the architecture and design of systems are functional and secure; support the design, development, implementation, and integration of security systems and system components.
Added 1 hour ago
Sentinel Sr Principal DevOps Engineer
Northrop Grumman
Roy, UT
Northrop Grumman Defense Systems (NGDS) is seeking a Sr. Principal DevOps Engineer. This role will focus on automating the provisioning and management of servers, storage, and networking…
Added 1 hour ago
EG
Dev Lead
Eliassen Group
Salt Lake City, UT
- $110 to $120 USD / hour
2+ years as a senior or principal engineer with design, implementation, and operational ownership.
Added 1 hour ago
EG
Dev Lead
Eliassen Group
Atlanta, GA
- $110 to $120 USD / hour
2+ years as a senior or principal engineer with design, implementation, and operational ownership.
Added 2 hours ago
Cleared Senior/Principal R&D Mechanical Engineer - W87-0/Sentinel Integration, Onsite
Sandia National Laboratories
Livermore, CA
We are seeking an experienced R&D Mechanical Engineer to join our multidisciplinary teams performing critical work to maintain a safe and reliable national defense while advancing warhead…
Added 2 hours ago
Cleared Senior/Principal R&D Electrical Engineer - W87-0/Sentinel Integration, Onsite
Sandia National Laboratories
Livermore, CA
We are seeking an experienced R&D Electrical Engineer to join our multidisciplinary teams performing critical work to maintain a safe and reliable national defense while advancing warhead…

Microsoft

Principal Software Engineer

WA, United States
Redmond, WA, United States
Redmond, United States

$142,800 to $304,200 USD / year

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Job details

Pay: $142,800 to $304,200 USD / year
Apply by: Apr 28, 2027
Posting language: English
Posted: Oct 30, 2026

Original job description

Overview

We are looking for a Principal Software Engineer who lives and breathes Azure Cosmos DB and knows how it is implemented underneath. Your mission is to make throttling disappear from Microsoft's AI plugin registry with fast, surgical, high-ROI changes. Success is objective: throttling goes away, reliability goes up, and latency goes down, even as scale grows. You will see the results in days, not quarters. We are the Agent Tools and Lifecycle team in Microsoft's Copilot, Agents and Platform (CAP) organization. We build the service behind the AI plugin registry. Admins use it in the Microsoft 365 admin center to govern the plugins (skills, connectors, and agents) that extend Microsoft Copilot, and users discover and use those plugins across products such as Copilot Chat, Cowork, Teams, Word, Excel, and PowerPoint. The registry is a core part of Microsoft's AI architecture, alongside Work IQ, and Copilot experiences across Microsoft depend on it. If you use an AI solution from Microsoft, you likely are working with our service. Come join us at the center of AI transformation at Microsoft! As a hands-on individual contributor, you will be the technical leader for the AI plugin registry's Azure Cosmos DB tier. Our catalog of plugins and agents, and the entitlements and policies that decide who can use them, live in Cosmos DB in data centers worldwide, including sovereign clouds. Traffic keeps growing as the registry expands to experiences such as Copilot Studio, GitHub Copilot, and Microsoft Foundry. Experience working on the internals of Cosmos DB or a comparable database, such as MongoDB, Amazon DynamoDB, or Apache Cassandra, and an understanding of the hardware and network limits that make them throttle, are especially valuable. Our global reach means 24/7 on-call service. This position is based in Redmond, Washington and requires the employee be in the office a minimum of 3 days per week. Microsoft’s mission is to empower every person and every organization on the planet to achieve more. As employees we come together with a growth mindset, innovate to empower others, and collaborate to realize our shared goals. Each day we build on our values of respect, integrity, and accountability to create a culture of inclusion where everyone can thrive at work and beyond.

Responsibilities

Cut request unit (RU) consumption to make throttling go away, fast. Start with the queries that use the most RUs, where we see room for 50–90% reductions: turn cross-partition and fan-out queries into point reads from Cosmos DB or Azure Blob Storage, batched reads, or single-partition queries, and tune indexes.
Pick work by return on investment. Ship several targeted fixes in parallel, each within days, and measure each one in production. Take on a larger redesign only when the data shows smaller fixes cannot get there, and deliver it in steps that each pay off.
Fix hot partitions and size limits at the source: partition keys, document design, indexing policies, and API contracts that give high-traffic calls the keys they need for point reads. When data has to move, migrate it with zero downtime across all environments, including sovereign clouds.
Decide what belongs in Cosmos DB. Move large, binary, unbounded, or rarely queried content to Azure Blob Storage or other storage, weighing latency, availability, and data-residency needs.
Remove redundant and sequential database calls on our busiest paths with batching, request coalescing, and caching, and use retry budgets, load shedding, and graceful degradation so database pressure does not turn into failed requests.
Work with product management and the teams that call us to give each caller a throttling budget. Find callers that request the same unchanged data again and again, help them cache on their side, and lower the budgets of the heaviest callers over time.
Make success measurable: own the telemetry, dashboards, and alerts, RU use per API and per caller, partition skew, availability, and latency. Set targets, show the effect of every change, and spot limits before we hit them.
Raise the bar through AI: write AI skills that review designs and code for Cosmos DB mistakes, find high-RU queries, and show engineers how to fix them, so your expertise scales across the team. Use agentic tools to build and validate fixes faster, following Responsible AI practices. Mentor engineers and represent us with the Azure Cosmos DB product group.
Serve as a Designated Responsible Individual (DRI) in our 24/7 on-call rotation, lead data-tier incident response, and turn what we learn into lasting fixes.

Qualifications

Required Qualifications:

Bachelor's Degree in Computer Science or related technical field AND 6+ years technical engineering experience with coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, or Python
OR equivalent experience.

Other Requirements:

Ability to meet Microsoft, customer and/or government security screening requirements are required for this role. These requirements include but are not limited to the following specialized security screenings:

Microsoft Cloud Background Check: This position will be required to pass the Microsoft Cloud background check upon hire/transfer and every two years thereafter.

Preferred Qualifications:

Master's Degree in Computer Science or related technical field AND 8+ 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 12+ years technical engineering experience with coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, or Python
OR equivalent experience.
4+ years of experience building or operating large-scale distributed databases, such as Azure Cosmos DB, MongoDB, Amazon DynamoDB, or Apache Cassandra, including partitioning, indexing, and query performance.
Experience finding and fixing throttling, hot partitions, or resource-heavy cross-partition queries in production databases.
Experience building or improving the internals of Azure Cosmos DB, or of a comparable distributed database such as MongoDB, Amazon DynamoDB, or Apache Cassandra, in areas such as partitioning, replication, storage engines, query execution, indexing, or rate limiting.
Deep, hands-on Azure Cosmos DB expertise: what drives the RUs each operation uses, physical partitions and splits, hierarchical partition keys, indexing policies, point reads and ReadMany versus cross-partition queries, change feed, consistency levels, multi-region accounts, autoscale, SDK (software development kit) retries, and diagnosing errors.
Track record of making throttling go away quickly, raising availability, and cutting tail latency in production, with targeted, high-ROI changes and before-and-after measurements to prove it.
Deep understanding of why distributed databases throttle, from per-partition throughput and storage limits to hardware, network, and replication overhead, and how to design data models that stay within those limits.
Experience moving large or rarely queried content from a document database to Azure Blob Storage or comparable object storage, and serving it with point reads.
Experience with zero-downtime data migrations and re-partitioning on live production systems.
Experience designing rate limits, quotas, and noisy-neighbor isolation for a multi-tenant platform, and getting partner teams to cache on their side.
Proficiency in C# and .NET, and experience with Azure services such as Azure Functions, Service Bus, Azure Cache for Redis, and API (application programming interface) Management.
Understanding of modern AI technologies, including generative AI and foundation models, and experience writing AI skills and using agentic tools to engineer faster.

#CosmosDB, #MongoDB, #DynamoDB, #Cassandra,# AI,# Artificial Intelligence

Software Engineering IC5 - The typical base pay range for this role across the U.S. is USD $142,800 - $274,800 per year. There is a different range applicable to specific work locations, within the San Francisco Bay area and New York City metropolitan area, and the base pay range for this role in those locations is USD $188,000 - $304,200 per year.

Certain roles may be eligible for benefits and other compensation. Find additional benefits and pay information here: https://careers.microsoft.com/us/en/us-corporate-pay

This position will be open for a minimum of 5 days, with applications accepted on an ongoing basis until the position is filled.

Microsoft is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to age, ancestry, citizenship, color, family or medical care leave, gender identity or expression, genetic information, immigration status, marital status, medical condition, national origin, physical or mental disability, political affiliation, protected veteran or military status, race, ethnicity, religion, sex (including pregnancy), sexual orientation, or any other characteristic protected by applicable local laws, regulations and ordinances. If you need assistance with religious accommodations and/or a reasonable accommodation due to a disability during the application process, read more about requesting accommodations.

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