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Added 11 mins ago
2027 Spring Electrical Engineer Co-op (Billerica, MA)
Applied Materials
Billerica, MA · Billerica
Applied Materials is the global leader in materials science and engineering solutions that are at the foundation of virtually every new semiconductor chip and advanced display in the world.…
Added 14 mins ago
PN
Research Engineer III - Building Energy Modeling
Pacific Northwest National Laboratory
Portland, OR · Richland, WA · Seattle, WA
- $112,500 USD / year
The BS&DG is seeking a Research Engineer III - Building Energy Modeling with strong knowledge of building energy systems, advanced hands-on EnergyPlus modeling expertise, programming and…
Added 14 mins ago
PN
Research Engineer II - Building Energy Modeling
Pacific Northwest National Laboratory
Portland, OR · Richland, WA · Seattle, WA
- $89,300 USD / year
The BS&DG is seeking a Research Engineer II - Building Energy Modeling with strong knowledge of building energy systems, hands-on Energy Plus modeling expertise, programming and data…
Added 14 mins ago
PN
Software Engineer II - Building Applications
Pacific Northwest National Laboratory
UNAVAILABLE · Portland, OR · Seattle, WA · Richland, WA
- $109,000 USD / year
Our Science & Technology directorates include National Security, Earth and Biological Sciences, Physical and Computational Sciences, and Energy and Environment. In addition, we have an…
Added 18 mins ago
Lead AI Transformation Engineer
Fiserv
Berkeley Heights, NJ
As a Lead AI Transformation Engineer, you will play a critical role in advancing AI-driven engineering practices and establishing technical excellence across the Issuer Solutions portfolio.…
Added 19 mins ago
Associate AI Engineer
Capgemini
New Brunswick, NJ
Knowledgeof SQL and data querying techniques.
Added 19 mins ago
M
Network / System Engineer II
ManpowerGroup
Jersey City, NJ
- $55 to $60 USD / hour
Partner closely with Network Operations, Monitoring/Telemetry, and Data Science teams to identify repeatable patterns and operationalize them.
Added 19 mins ago
Site Reliability Engineer
Highmark Health
Trenton, NJ
Bachelor’s degree in Computer Science, Engineering, Management Information Systems, IT, or related field or relevant experience and/or
Added 32 mins ago
Senior Machine Learning Engineer
Amgen
Washington D.C., DC
We are seeking a Senior Machine Learning Engineer to help build high-impact AI proofs-of-concept that are credible, scalable, secure, and designed with a clear path to production. This role…
Added 32 mins ago
Site Reliability Engineer
Highmark Health
Washington, DC
Bachelor’s degree in Computer Science, Engineering, Management Information Systems, IT, or related field or relevant experience and/or
Added 59 mins ago
Computer Vision Engineer
Auterion
Manassas, VA
We are looking for a Computer Vision Engineer to help build and deploy perception systems that run onboard autonomous aerial platforms. This is not offline research. Our algorithms run in…
Added 59 mins ago
Quality Engineer (PSP)
Veeco Instruments
Horsham, PA
Added 59 mins ago
Full Stack Engineer II
AmerisourceBergen
Conshohocken, PA
…today! Job Details Summary: We're looking for a Full Stack Engineer II who can build and maintain applications across the stack while also working comfortably with data platforms and…
Added 1 hour ago
Site Reliability Engineer
Highmark Health
Harrisburg, PA
Bachelor’s degree in Computer Science, Engineering, Management Information Systems, IT, or related field or relevant experience and/or
Added 1 hour ago
CTO, Anthropic Practice
EPAM Systems
Philadelphia, PA
Design agentic architectures: orchestration patterns, tool and data integration, human-in-the-loop checkpoints, evaluation, observability, and guardrails
Added 1 hour ago
Site Reliability Engineer
Highmark Health
Little Rock, AR
Bachelor’s degree in Computer Science, Engineering, Management Information Systems, IT, or related field or relevant experience and/or
Added 1 hour ago
A
Systems Test Engineer
Actalent
Bridgeton, MO
- $93,000 to $125,000 USD / year
The Systems Test Engineer is responsible for designing, planning, and executing systems-level testing for complex products, systems, and subsystems that may include electrical, mechanical,…
Added 1 hour ago
Engineer III- Technology
Edward Jones
St. Louis, MO
¹Fortune 500, published June 2024, data as of December 2023. Compensation provided for using, not obtaining, the rating.
Added 1 hour ago
O
Lead Principal Site Reliability Engineer - (work in Vienna VA location)
Oracle
Jefferson City, MO
- $96,300 to $264,100 USD / year
We are seeking a highly motivated Site Reliability Engineer (SRE) to support a strategic customer's cloud platform and mission-critical applications. The SRE will be responsible for…
Added 1 hour ago
Site Reliability Engineer
Highmark Health
Jefferson City, MO
Bachelor’s degree in Computer Science, Engineering, Management Information Systems, IT, or related field or relevant experience and/or
Added 1 hour ago
Principal Platform Engineer – EIP / CCaaS
Navy Federal Credit Union
Vienna, VA
Engineer integrations between Dynamics 365 Contact Center and enterprise applications, APIs, data platforms, identity services, and CRM capabilities.
Added 1 hour ago
Senior Palantir AI and Data Science Engineer - Secret Clearance Required
Deloitte
Rosslyn, VA
As an AI & Data Science Engineer III on the AI & Data team, you will be responsible for...
Added 1 hour ago
Foundry Developer
CACI International
Ashburn, VA
Palantir certifications. Data Engineer or Application Developer track.
Added 1 hour ago
Artificial Intelligence/Machine Learning (AI/ML) Engineer (2026-0238)
Acclaim Technical Services
Chantilly, VA
Bachelor's degree in Computer Science, Data Science, Mathematics, Engineering, or a related field, plus 5 years of relevant experience. Additional years of experience may be accepted in…
Added 1 hour ago
Manufacturing Equipment Qualification (IQ/OQ/PQ) Engineer
Capgemini
Mclean, VA
Bachelor's degree in Science, Engineering, or a related field.

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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