Principal Software Engineer Jobs in Illinois

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Lead Ruby on Rail Developer

Talent Groups

•

Remote

Contract, Third Party

Healthcare background is preferred but not mandatory. Key Responsibilities: Develop and maintain web applications using Ruby on Rails framework. Conduct code reviews and provide constructive feedback to team members. Stay updated with the latest trends and technologies in Ruby on Rails development. Requirements: Bachelor s degree in computer science, Engineering, or a related field. Proven experience as a Ruby on Rails Developer or similar role. Proficiency in Ruby programming language and the R
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Posted 40 days ago | Updated 5 days ago

Engineer, Sr Staff Fuels

Constellation Energy

•

Warrenville, Illinois, USA

Full-time

WHO WE ARE As the nation's largest producer of clean, carbon-free energy, Constellation is focused on our purpose: accelerating the transition to a carbon-free future. We have been the leader in clean energy production for more than a decade, and we are cultivating a workplace where our employees can grow, thrive, and contribute. Our culture and employee experience make it clear: We are powered by passion and purpose. Together, we're creating healthier communities and a cleaner planet, and our
Posted 40 days ago | Updated 2 hours ago

Electrical Design Engineer (Hybrid-Puerto Rico)

RTX Corporation

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Remote or Aguadilla, Aguadilla, Puerto Rico

Full-time

Date Posted: 2025-04-23 Country: United States of America Location: HPR01: Collins Puerto Rico- Aguadilla Road 110 North Km 28.8 San Antonio Industrial Park, Aguadilla, PR, 00603 USA Position Role Type: Unspecified U.S. Citizen, U.S. Person, or Immigration Status Requirements: Security Clearance: Join Collins Aerospace as an Electrical Design Engineer and assume a key role within the Communication Products Engineering department in Mission Systems. We're looking to create a pipeline of passiona
Posted 58 days ago | Updated 8 hours ago

Engineer, Sr Staff Fuels

Constellation Energy

•

Warrenville, Illinois, USA

Full-time

WHO WE ARE As the nation's largest producer of clean, carbon-free energy, Constellation is focused on our purpose: accelerating the transition to a carbon-free future. We have been the leader in clean energy production for more than a decade, and we are cultivating a workplace where our employees can grow, thrive, and contribute. Our culture and employee experience make it clear: We are powered by passion and purpose. Together, we're creating healthier communities and a cleaner planet, and our
Posted 42 days ago | Updated 4 hours ago

Remote - Lead Full Stack Engineer [Angular, Java, Google Cloud Platform]

GRT Corporation

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Remote

Contract

Job Title: Full Stack Engineering Lead [Java, Spring Boot, Angular 16+, Google Cloud Platform] Location: United States - Remote Duration: Contract (12-15 months, potential extension) PositionSummary: A GRT Client is seeking an accomplished Full Stack Engineering Lead to steer multiple onshore/offshore pods through the full software development lifecycle of large scale, cloud native applications. You will combine deep technical mastery in Angular 16+, Java, Spring Boot, and PostgreSQL with prove
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Posted 59 days ago | Updated 15 days ago

Lead AI Agent Developer -Microsoft Copilot Studio

Reliable Software Resources

•

Remote

Contract, Third Party

Position: Lead AI Agent Developer Microsoft Copilot Studio Remote 6+ months Qualifications: 3+ years in Generative AI / LLM solutions, 1+ year hands-on with Microsoft Copilot Studio building and operationalizing agents in production. Proven production experience building Copilot Studio agents end-to-end (prompt design deployment monitoring). Strong grasp of AI Foundry, vector stores, Retrieval-Augmented Generation, and grounding strategies. Expertise in prompt engineering, evaluation techn
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Posted 4 days ago | Updated 19 hours ago

Engineer, Sr Staff Fuels

Constellation Energy

•

Warrenville, Illinois, USA

Full-time

WHO WE ARE As the nation's largest producer of clean, carbon-free energy, Constellation is focused on our purpose: accelerating the transition to a carbon-free future. We have been the leader in clean energy production for more than a decade, and we are cultivating a workplace where our employees can grow, thrive, and contribute. Our culture and employee experience make it clear: We are powered by passion and purpose. Together, we're creating healthier communities and a cleaner planet, and our
Posted 58 days ago | Updated 8 hours ago

Hardware System Engineer Staff/Systems Lead

Lockheed Martin Corporation

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Remote or Owego, New York, USA

Full-time

Job Description What We're Doing At Lockheed Martin, we are dedicated to pushing the boundaries of innovation and technology. Our mission systems drive advancements in defense, aerospace, and technology, helping to shape a secure and sustainable future. We pride ourselves on creating cutting-edge products that solve the world's toughest challenges, and we're looking for passionate engineers to help us deliver solutions that matter. The Work Lockheed Martin is seeking an experienced Hardware
Posted 54 days ago | Updated 8 hours ago

Lead Mechanical Systems Integration Engineer

Lockheed Martin Corporation

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Remote or Littleton, Colorado, USA

Full-time

Job Description The coolest jobs on this planet or any other are with Lockheed Martin Space. We invite you to join the Fleet Ballistic Missile (FBM) Program Systems Engineering Integration and Test (SEIT) team as a Lead Mechanical Systems Integration Engineer within the Embedded Systems Engineering (ESE) organization. The role of the ESE is to partner with the FBM Propulsion, Structures, Ordnance, and Controls (PSOC) Subsystem Integrated Product Teams (IPTs) to shape the design, development, a
Posted 33 days ago | Updated 8 hours ago

Application Developer Lead - GXT Turbo - 5738492

Accenture LLP

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Remote or Philadelphia, Pennsylvania, USA

Full-time

Accenture Flex offers you the flexibility of local fixed-duration project-based work powered by Accenture, a leading global professional services company. Accenture is consistently recognized on FORTUNE's 100 Best Companies to Work For and Diversity Inc's Top 50 Companies For Diversity lists. As an Accenture Flex employee, you will apply your skills and experience to help drive business transformation for leading organizations and communities. In addition to delivering innovative solutions for
Posted 41 days ago | Updated 8 hours ago

Lead AI/ML Engineer (NLP) - Remote

UnitedHealth Group

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Remote or Eden Prairie, Minnesota, USA

Full-time

Optum is a global organization that delivers care, aided by technology to help millions of people live healthier lives. The work you do with our team will directly improve health outcomes by connecting people with the care, pharmacy benefits, data and resources they need to feel their best. Here, you will find a culture guided by diversity and inclusion, talented peers, comprehensive benefits and career development opportunities. Come make an impact on the communities we serve as you help us adv
Posted 57 days ago | Updated 8 hours ago

Transportation/Roadway Engineer

Parsons Services Company

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Remote or Chicago, Illinois, USA

Full-time

In a world of possibilities, pursue one with endless opportunities. Imagine Next! When it comes to what you want in your career, if you can imagine it, you can do it at Parsons. Imagine a career working with exceptional people sharing a common quest. Imagine a workplace where you can be yourself. Where you can thrive. Where you can find your next, right now. We've got what you're looking for. Job Description: Parsons is looking for an amazingly talented Transportation Engineer to join our tea
Posted 60+ days ago | Updated 8 hours ago

Lead Network Tools Integration Developer

Copeland

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Remote

Full-time

About Us We are a global climate technologies company engineered for sustainability. We create sustainable and efficient residential, commercial and industrial spaces through HVACR technologies. We protect temperature-sensitive goods throughout the cold chain. And we bring comfort to people globally. Best-in-class engineering, design and manufacturing combined with category-leading brands in compression, controls, software and monitoring solutions result in next-generation climate technology th
Posted 15 days ago | Updated 8 hours ago

Front End Developer Technical Lead

3M Company

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Remote or Maplewood, Minnesota, USA

Full-time

Job Description: Technical Lead - Front End Development Team Collaborate with Innovative 3Mers Around the World Choosing where to start and grow your career has a major impact on your professional and personal life, so it's equally important you know that the company that you choose to work at, and its leaders, will support and guide you. With a wide variety of people, global locations, technologies and products, 3M is a place where you can collaborate with other curious, creative 3Mers. Thi
Posted 60+ days ago | Updated 8 hours ago

Application Developer Technical Lead (AVP)

Barclays

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Remote or Hanover, New Jersey, USA

Full-time

Job Description Purpose of the role To design, develop and improve software, utilising various engineering methodologies, that provides business, platform, and technology capabilities for our customers and colleagues. Accountabilities Development and delivery of high-quality software solutions by using industry aligned programming languages, frameworks, and tools. Ensuring that code is scalable, maintainable, and optimized for performance.Cross-functional collaboration with product managers, d
Posted 22 days ago | Updated 8 hours ago

Communication Systems Engineer

Motorola Solutions

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North Carolina, USA

Full-time

Company Overview At Motorola Solutions, we believe that everything starts with our people. We're a global close-knit community, united by the relentless pursuit to help keep people safer everywhere. Our critical communications, video security and command center technologies support public safety agencies and enterprises alike, enabling the coordination that's critical for safer communities, safer schools, safer hospitals and safer businesses. Connect with a career that matters, and help us buil
Posted 60+ days ago | Updated 8 hours ago

Senior Plant Engineer

GE Vernova

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Remote

Full-time

Job Description Summary The Senior Plant Engineer is the plant engineering representative at the launch of all projects and will control the technical execution of the project through closeout. The Sr Plant Engineer is accountable to lead other engineers to define plant solutions & tools and to support proposal tender offerings and project execution. The Senior Plant Engineer will also serve as technical mentor resolving conflicts and certifying finished engineering products as proper and correc
Posted 8 hours ago

Lead/Senior Full Stack Engineer (Node & React) with AI/ML

iSpace, Inc

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Remote

Contract

Only on W2, NO C2C/1099 Title: Lead Full Stack Engineer (Node & React) with AI/ML Position type: 12+ Months contract to start (could go for over 1-2 years) Location: Remote Top Skills: Node. JS, React, State Management, MySQL, AWS, Docker, Kubernetes, Open AI/Chat GPT, lead experience with both onshore and offshore. Qualifications: 7+ years of experience building complex web applications.Solid work experience using component-based development on the client side.Proficiency with front-end techn
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Posted 60+ days ago | Updated 16 hours ago

Senior Data Science Manager

Coinbase

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Remote

Full-time

Ready to be pushed beyond what you think you're capable of? At Coinbase, our mission is to increase economic freedom in the world. It's a massive, ambitious opportunity that demands the best of us, every day, as we build the emerging onchain platform - and with it, the future global financial system. To achieve our mission, we're seeking a very specific candidate. We want someone who is passionate about our mission and who believes in the power of crypto and blockchain technology to update the
Posted 60+ days ago | Updated 8 hours ago

Systems Software Programmer Project Lead - REMOTE

Chandra Technologies, Inc.

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Remote

Contract

Job Description: Crop to Crop resumes are accepted The Department seeks a highly motivated individual who has the skills and experience of designing, developing, and supporting enterprise scale web applications on the Microsoft .NET platform for the integrated Child Support Enforcement applications under the South Carolina Department of Social Services. This position will be primarily focused on the SC New Hire application. Candidate should be an experienced developer in visual interfaces, appli
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Posted 3 days ago