5,134 Results for

Principal Jobs in Wethersfield, CT

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System Design Engineer, Sodium Cover Gas Systems System One

Bellevue, WA

Remote

$69–$115 / hour
Quick Apply

Interface with the design team to create and manage drawing packages of system designs, including but not limited to Piping and Instrumentation Diagrams (P&IDs), 3D models, and system interface drawings. B.S. in Mechanical, Chemical, Nuclear Engineering, or related discipline from an accredited university and 10+ years direct experience with proven mechanical systems skills.

10 days ago

Senior Fuel Handling Mechanical Design Engineer System One

Bellevue, WA

Remote

$56–$95 / hour
Quick Apply

Working experience with design codes such as the ASME Boiler and Pressure Vessel Code Section III, or Section VIII is preferred but not required. Support continuous learning and application of nuclear industry best practices to maintain the highest quality of engineering design and proactively identify process change/enhancement opportunities.

10 days ago

Senior Engineer, Plant Thermal Hydraulics Methods System One

Bellevue, WA

Remote

$52–$85 / hour
Quick Apply

Other engineering activities include, but are not limited to, system transient codes development and maintenance, performing reactor transient analyses, code benchmark with Integral Effect Tests (IETs) or Separate Effect Tests (SETs), scaling analysis, software commercial-grade dedication, contributing to code assessment and adequacy evaluation, as well as performing verification and validation activities. Requirements Degree in Mechanical, Nuclear, Chemical Engineering, or similar fields, with 5+ years of experience in system-level thermal hydraulic modeling and method development for nuclear or complex energy systems.

9 days ago

Senior Nuclear Engineer, Plant Thermal Hydraulics Validation System One

Bellevue, WA

Remote

$56–$95 / hour
Quick Apply

Define validation needs, develop test requirements, and collaborate closely with test engineering teams to ensure alignment between model gaps and experimental programs. Apply and improve SQA and NQA1 modeling quality practices and ensure traceability and configuration control of analysis inputs, models, and results.

10 days ago

Senior Engineer, Fuel Handling and Dry Storage System One

Bellevue, WA

Remote

$52–$85 / hour
Quick Apply

This role is responsible for the engineering design of spent fuel pool systems, dry cask storage equipment, and associated mechanical systems while supporting licensing, regulatory compliance, and multidisciplinary engineering activities. System One is seeking an experienced Senior Fuel Handling & Dry Storage System Engineer to support the design, analysis, and qualification of nuclear fuel handling and dry storage systems for advanced nuclear energy projects.

10 days ago

Materials Engineer System One

Bellevue, WA

Remote

$36–$95 / hour
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Perform scientific analysis of reports and test data (e.g., metallography, non-destructive inspection, mechanical properties, ductility) and generate technical specifications to document new knowledge related to reactor design and qualification. This role will work as part of a high functioning team of engineers focused on materials, processes, supply chain development and supplier qualification for next generation material and components for sodium cooled fast reactors.

3 days ago

Sr. Materials Engineer System One

Bellevue, WA

Remote

$55–$91 / hour
Quick Apply

Oversee test programs designed to develop an understanding of complex mechanical phenomena (e.g., creep, fatigue, creep fatigue, stress corrosion cracking, and fracture) in sodium cooled fast reactor plant materials such as steel alloys. Perform scientific analysis of reports and test data (e.g., metallography, non-destructive inspection, mechanical properties, ductility) and generate technical specifications to document new knowledge related to reactor design and qualification.

4 days ago

Security Platform Engineer - MTS Tableau Software

Bellevue, WA

This role is ideal for a Salesforce Platform Developer who wants to apply their craft to a high-leverage problem: turning regulatory compliance from a manual, evidence-chasing exercise into an engineered system of record, automated controls, and agent-driven workflows. • Architect Agentforce workflows: Build LLM-powered workflows for signal triage, root-cause analysis, evidence evaluation, and audit narrative generation grounded in our GRC data model.

12 days ago

Primary Heat Transfer Engineer System One

Bellevue, WA

Remote

$64–$108 / hour
Quick Apply

Generate design package for systems, sub-systems, and equipment designs including coordination of calculations, design reports, mechanical drawings, and engineering design specifications. Provide technical direction and oversight of supplier projects, working with the contract administrator to ensure delivery of data and other deliverables, as well as coordination and performance of technical reviews of deliverables.

5 days ago

Senior Software Engineer - FDE Microsoft

Redmond, WA

$119,800–$234,700 / year

Masters 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 Bachelors 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 equivalent experience. We are a global team of world-class engineers who have been working in a Forward Deployed Engineering (FDE) model for more than a decade, embedding directly within customer teams to solve their toughest challenges, side-by-side, and shipping production-ready solutions in days, not months.

12 days ago

Senior Software Engineer Microsoft

Redmond, WA

$119,800–$234,700 / year

Support security incidents and partner with product, support, field, Artificial Intelligence (AI), and security-adjacent teams to assess impact, deliver containment and remediation fixes, use observability and telemetry to detect and diagnose issues, incorporate real-world attack patterns and operational constraints, and land post-incident hardening improvements. 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 $160,200 - $261,000 per year.

12 days ago

Software Engineer 2 - CoreAI Microsoft

Redmond, WA

$102,100–$202,200 / year

Bachelors Degree in Computer Science or related technical field AND 4+ years technical engineering experience with coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, or Python Masters 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. You will help evolve our Inventory-as-Code platform, building workflows that validate inventory, enforce governance policies, reconcile data across systems, and provide developers with clear and actionable experiences when inventory changes are required.

12 days ago

Principal Software Engineer Microsoft

Redmond, WA

$142,800–$274,800 / year

Masters 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 Bachelors 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. 2+ years of experience delivering cloud-native services on Azure, AWS, or GCP using containerization, microservices, and orchestration technologies such as Kubernetes, with accountability for availability, latency, reliability, or cost objectives.

12 days ago

Software Engineer II, Foundry Agents - CoreAI Microsoft

Redmond, WA

$102,100–$202,200 / year

Within CoreAI, the Foundry Agents organization is responsible for key ownership areas across the end‑to‑end agent lifecycle: (a) Foundry Agents platform to deploy and run agents securely at enterprise scale with seamless integration with governed tools, (b) model fine‑tuning to train and improve agentic performance, and (c) Foundry observability to generate insights from agentic traces and continuously evaluate and optimize agents. As a Software Engineer II within Foundry Agents, you will contribute to building large‑scale, cloud‑native systems that support the full lifecycle of advanced agentic applications — from secure enterprise deployment and tool integration, to fine‑tuning workflows, to observability and evaluation in production.

12 days ago

Software Engineer/Developer Microsoft

Redmond, WA

$86,100–$169,800 / year

Master’s Degree in Computer Science AND 4+ years of full-time professional software development experience, including designing, developing, testing, and maintaining production code in one or more programming languages such as C, C++, C#, Java, JavaScript, or Python AND 5+ years technical engineering experience with coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, or Python. You will play a central role in shaping platform strategy, reusable skill architectures, and defining integration contracts for intelligence features, enabling Microsoft to meet the urgent demand for innovation across global support operations.

12 days ago

Principal Software Engineer - CoreAI Microsoft

Redmond, WA

$142,800–$274,800 / year

Masters 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#, Python, or Java OR Bachelors 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. Proactively improves troubleshooting guides (TSGs), wikis, tests, and telemetry to make on-call better, and recommends user-facing support documentation and additional test coverage to reduce likelihood of future user-initiated incidents.

12 days ago

Senior Quality Assurance Engineer System One

Redmond, WA

$65–$73 / hour
Quick Apply

This contract role offers the opportunity to collaborate across operations, engineering, and supplier teams to investigate quality issues, drive corrective actions, and ensure compliance in a highly regulated environment. Join a global leader in medical technology and manufacturing as a Quality Engineer supporting critical product quality, supplier quality, and continuous improvement initiatives.

10 days ago

Software Engineer II - CTJ- POLY Microsoft

Redmond, WA

$102,100–$202,200 / year

With minimal supervision, works with relevant security partners to define security promises and security invariants while factoring in attacker/investigator personas for security monitoring and telemetry needs, ensure threat models and premortems validate upstream and downstream assumptions and security invariants, establish security breach drills and security incident response processes (e.g., impact analysis, containment), and ensure that artificial intelligence (AI) safety features are implemented for the AI production systems tied to a set of product features. Masters 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 Bachelors 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.

12 days ago

Program Chief Engineer Leidos

Lake Stevens, WA

$131,300–$237,350

If you received an email purporting to be from Leidos that asks for payment-related information or any other personal information (e.g., about you or your previous employer), and you are concerned about its legitimacy, please make us aware immediately by emailing us at LeidosCareersFraud@leidos.com. Leidos’ Undersea Systems Division is a recognized leader in C4ISR technologies, delivering innovative, mission-critical solutions across sensor networks, unmanned systems, and tactical platforms.

30+ days ago

Software Engineer II - CTJ - Poly Microsoft

Redmond, WA

$102,100–$202,200 / 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 $133,800 - $219,200 per year. As a Software Engineer II in Microsoft’s Sovereign Cloud Security team, you’ll help design, deliver, and secure highly reliable services that underpin both internal security platforms and customer‑facing cloud offerings.

12 days ago

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Principal Jobs in Wethersfield, CT

System Design Engineer, Sodium Cover Gas Systems System One

Senior Fuel Handling Mechanical Design Engineer System One

Senior Engineer, Plant Thermal Hydraulics Methods System One

Senior Nuclear Engineer, Plant Thermal Hydraulics Validation System One

Senior Engineer, Fuel Handling and Dry Storage System One

Materials Engineer System One

Sr. Materials Engineer System One

Security Platform Engineer - MTS Tableau Software

Primary Heat Transfer Engineer System One

Senior Software Engineer - FDE Microsoft

Senior Software Engineer Microsoft

Software Engineer 2 - CoreAI Microsoft

Principal Software Engineer Microsoft

Software Engineer II, Foundry Agents - CoreAI Microsoft

Software Engineer/Developer Microsoft

Principal Software Engineer - CoreAI Microsoft

Senior Quality Assurance Engineer System One

Software Engineer II - CTJ- POLY Microsoft

Program Chief Engineer Leidos

Software Engineer II - CTJ - Poly Microsoft

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