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Added 5 mins ago
Principal Platform Engineer – EIP / CCaaS
Navy Federal Credit Union
Vienna, VA
Lead technical troubleshooting of complex production issues.
Added 5 mins ago
Information Systems Security Engineer (ISSE) Linux/RHEL
CACI International
Sterling, VA
Lead and support Assessment and Authorization (A&A) activities to achieve and maintain Authorization to Operate (ATO) under the Risk Management Framework (RMF)
Added 5 mins ago
Full-Stack Engineer 4 (Python, Java, AWS)
Capital One
McLean, VA
Lead a portfolio of diverse technology projects and a team of developers with deep experience in distributed microservices, and full stack systems to create solutions that help meet…
Added 5 mins ago
Business Manager - Modeling and Advanced Data Insights
Capital One
McLean, VA · Richmond, VA
…monitoring, and reporting using tools such as AWS, Snowflake, Python, and Spark. As the model developer for advancing transaction monitoring with machine learning, our team is responsible…
Added 6 mins ago
Full-stack Engineer 4, Tech College Engineering
Capital One
Richmond, VA · McLean, VA
Lead a portfolio of diverse technology projects and a team of developers with deep experience in distributed microservices, and full stack systems to create solutions that help meet…
Added 6 mins ago
EG
Dev Lead
Eliassen Group
Richmond, VA
- $110 to $120 USD / hour
Our client seeks a Dev Lead to own architecture, code quality, and delivery for an Agile squad building AI solutions that enable knowledge discovery and reuse. The role balances hands-on…
Added 27 mins ago
Lead Data Scientist
MetLife
Cary, NC
The Lead Data Scientist is crucial to DnA USB's Engagement Strategy team, creating Machine Learning and AI solutions to support marketing campaigns and business engagement. You will provide…
Added 27 mins ago
T
Sr Internal Auditor
TIAA
Charlotte, NC
- $86,300 to $113,000 USD / year
May act as the lead expert in the group on critical business areas, processes, systems and/or regulations.
Added 28 mins ago
M
Lead AI Engineer
ManpowerGroup
Charlotte, NC
- $75 to $85 USD / hour
Our client, an innovative technology organization, is seeking a Lead AI Engineer to join their team. As a Lead AI Engineer, you will be part of the AI Engineering group supporting the…
Added 28 mins ago
EG
Dev Lead
Eliassen Group
Raleigh, NC
- $110 to $120 USD / hour
Our client seeks a Dev Lead to own architecture, code quality, and delivery for an Agile squad building AI solutions that enable knowledge discovery and reuse. The role balances hands-on…
Added 50 mins ago
C
ETL Ab Initio lead with GCP experience.
Cognizant
Hartford, CT
- $100,000 to $135,000 USD / year
Title : ETL Ab Initio lead with GCP experience.
Added 50 mins ago
Lead Data Scientist (Medicare Sales Strategy)
CVS Health
Hartford, CT
We are seeking a Lead Data Scientist to own the analytical strategy and data science roadmap for our Medicare sales organization and serve as a primary advocate for AI adoption across the…
Added 50 mins ago
EG
Dev Lead
Eliassen Group
Hartford, CT
- $110 to $120 USD / hour
Our client seeks a Dev Lead to own architecture, code quality, and delivery for an Agile squad building AI solutions that enable knowledge discovery and reuse. The role balances hands-on…
Added 1 hour ago
Software Verification Engineer
GE HealthCare
Madison, WI
Test Automation: Design, build, and maintain robust automated testing frameworks and scripts using modern programming and scripting languages (e.g., Python, C++). Lead CSV tool validation.
Added 1 hour ago
EG
Dev Lead
Eliassen Group
Madison, WI
- $110 to $120 USD / hour
Our client seeks a Dev Lead to own architecture, code quality, and delivery for an Agile squad building AI solutions that enable knowledge discovery and reuse. The role balances hands-on…
Added 1 hour ago
BA
Remote Sensing Software Engineer, Senior
Booz Allen Hamilton
Aurora, CO
- $86,900 to $198,000 USD / year
…sensing exploitation pipelines, guide technical direction, and lead multi-disciplinary teams building high-fidelity space observation analytics. You will shape nextgeneration tools that…
Added 1 hour ago
BA
Full Stack Developer, Senior
Booz Allen Hamilton
Aurora, CO
- $86,900 to $198,000 USD / year
As a Senior Full Stack Developer at Booz Allen, you will lead the modernization of missioncritical GEOINT systems by architecting and delivering cloudnative, datadriven applications and…
Added 1 hour ago
MS
Senior Business Development Engineer (BDE), US Army
Motorola Solutions, Inc.
Denver, CO
- $40,123 USD / year
Lead the technical planning, network configuration, and live-on-the-air execution of field trials, modernizations, and user evaluations in conjunction with the BD and Applications…
Added 1 hour ago
BA
Full Stack Developer, Senior
Booz Allen Hamilton
Aurora, CO
- $86,900 to $198,000 USD / year
As a Senior Full Stack Developer at Booz Allen, you will lead the modernization of missioncritical GEOINT systems by architecting and delivering cloudnative, datadriven applications and…
Added 1 hour ago
BA
Solution Architect, Lead
Booz Allen Hamilton
Aurora, CO
- $99,000 to $225,000 USD / year
As a Lead Solution Architect at Booz Allen, you will define and drive the end-to-end architecture for modernizing an analysis platform for an intelligence domain. You will lead the design…
Added 1 hour ago
EG
Dev Lead
Eliassen Group
Oklahoma City, OK
- $110 to $120 USD / hour
Our client seeks a Dev Lead to own architecture, code quality, and delivery for an Agile squad building AI solutions that enable knowledge discovery and reuse. The role balances hands-on…
Added 1 hour ago
M
Principal Software Engineer - CTJ - Poly
Microsoft
VA · Reston, VA · Reston
- $142,800 to $304,200 USD / year
…technical direction for significant engineering initiatives, and lead solutions from early investigation through production adoption. Your work will help make new capabilities easier to…
Added 1 hour ago
M
Principal Software Engineer
Microsoft
WA · Redmond, WA · Redmond
- $142,800 to $304,200 USD / year
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.
Added 1 hour ago
M
Cloud Solution Architect - PowerApps/Copilot Studio - CTJ - Top Secret
Microsoft
HI · Honolulu, HI · Honolulu
- $106,400 to $222,600 USD / year
Drive Customer Success: Lead architectural design, engaging with business and technical decision makers to drive intent and enable sustained usage of Agents & the Power Platform securing…
Added 1 hour ago
Engineer - Sales and Tender
Target
Brooklyn Park, MN
Use your skills, experience and talents to be a part of groundbreaking thinking and visionary goals. As an engineer, you’ll take the lead as you…

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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