Sr. Software Engineer (C++ & C#) - Onsite
Tech Stack
Job Description, Responsibilities & Requirements
About the Position
Sr. Software Engineer (C++ & C#) - Onsite
Date published: Jul 13 2026
Location: Lake Forest / United States
Job category: Digital
Work model: Work from Office
Please note, this role is not able to offer visa transfer or sponsorship now or in the future
About Us
Cognizant is one of the world's leading professional services companies, transforming clients' business, operating, and technology models for the digital era. Our unique industry-based, consultative approach helps clients envision, build, and run more innovative and efficient businesses. Headquartered in the U.S., Cognizant, a member of the NASDAQ-100, is ranked 195 on the Fortune 500 and is consistently listed among the most admired companies in the world. Learn how Cognizant helps clients lead with digital at www.cognizant.com.
About Cognizant’s IoT Practice
Intelligent, IoT-enabled products will soon result in the proliferation of data and disrupt virtually all industries. To be successful, both large and small companies must leverage IoT capabilities by designing modern products that fundamentally connect people with processes. Within Cognizant IoT, we engineer industry-aligned, IoT-enabled products that merge industry needs with human drivers. Our intelligent products will revolutionize experiences and result in exciting, transformative outcomes. Without human-centered thinking, connected products are just standalone things-but with it, our modern connected products facilitate a unified way of life enjoyed by all.
Job Summary
We are looking for a Senior Software Engineer to develop and support advanced Digital Twin and Control System Simulation solutions used in industrial environments. This role involves designing, developing, and maintaining software applications that emulate plant control systems for testing, validation, troubleshooting, and operator training.
Key Responsibilities
- Develop and maintain software applications using C++ and C#.
- Design and enhance client/server solutions, REST APIs, and distributed systems.
- Apply object-oriented design principles, design patterns, and software engineering best practices.
- Troubleshoot complex issues through debugging, root-cause analysis, and performance optimization.
- Develop automated tests and support quality initiatives using TDD and CI/CD methodologies.
- Collaborate with cross-functional teams using Azure DevOps, Git, and Agile/Scrum practices.
Required Qualifications
- 5+ years of software development experience.
- Strong expertise in C++, C#, Visual Studio, and Windows application development.
- Experience with REST APIs, networking concepts (L2/L3), and client/server architectures.
- Solid understanding of OOP/OOD, design patterns, automated testing, and version control systems.
Preferred Skills
- Experience with industrial automation, control systems, simulation software, or Digital Twin technologies.
- Exposure to cloud platforms such as Azure or AWS.
- Knowledge of operational technology (OT) environments and industrial networking.
We Offer
Join a team building innovative software solutions that help industrial organizations improve operational readiness, system reliability, and workforce training through advanced simulation and Digital Twin technologies.
**Compensation: **- Base Pay + COLA and this position is also eligible for Cognizant’s discretionary annual incentive program, based on performance and subject to the terms of Cognizant’s applicable plans. Application will be accepted by 8/13/2026
Benefits: Cognizant offers the following benefits for this position, subject to applicable eligibility requirements:
- Medical/Dental/Vision/Life Insurance
- Paid holidays plus Paid Time Off
- 401(k) plan and contributions
- Long-term/Short-term Disability
- Paid Parental Leave
- Employee Stock Purchase Plan
About Cognizant
Cognizant (Nasdaq: CTSH) is an AI Builder and technology services provider, bridging the gap between AI investment and enterprise value by building full-stack AI solutions for our clients. Our deep industry, process and engineering expertise enables us to build an organization’s unique context into technology systems that amplify human potential, drive tangible outcomes and keep global enterprises ahead in a fast-changing world. See how at cognizant.ai or @cognizant.
Additional Employment Information
Compensation information is accurate as of the date of this posting. Cognizant reserves the right to modify this information at any time, subject to applicable law.
Applicants may be required to attend interviews in person or by video conference. In addition, candidates may be required to present their current state or government issued ID during each interview.
Cognizant is an equal opportunity employer. Your application and candidacy will not be considered based on race, color, sex, religion, creed, sexual orientation, gender identity, national origin, disability, genetic information, pregnancy, veteran status or any other characteristic protected by federal, state or local laws.
If you have a disability that requires reasonable accommodation to search for a job opening or submit an application, please email [email protected] with your request and contact information.
Benefits that help you thrive and grow
Our benefits program is built with you in mind-so you can enjoy a fulfilling, balanced and healthy life.
Financial wellbeing
We regularly review market data to ensure compensation reflects the value you bring. Your benefits extend beyond pay and may include retirement plans, financial education, etc.
Physical and mental health
We empower you to prioritize your wellbeing through paid time off, flexible working where possible, healthcare plans, counselling, our Mental Health Allyship program and more.
Your career, your way
With 350,000+ roles at Cognizant, you’ll have opportunities explore new technologies, industries and locations-and build the skills you need to grow your career.
Real-world impact
Think about the biggest brands you rely on. Chances are, they rely on us to help strengthen their business. Here, you’ll turn bold ideas into solutions that improve lives everywhere.
Your Path to Cognizant
Here’s what you can expect from our hiring process. Please keep in mind that it may vary by role and location. Explore our FAQs to learn more.
Step 1: Apply to the right opportunity
Find an open role that matches your skills and career goals and show us why you’re the person for the job. Don’t see the right opportunity? Consider joining our Talent Community.
Step 2: Connect with your recruiter
If one of our recruiters sees a fit, they’ll set up a short intro call to learn more about you and how your experiences and skills match the role.
Step 3: Show off your skills
If you and our team would like to continue the process, you’ll interview with our hiring team. Some roles may also require technical assessments and/or client interviews.
Step 4: Decision time
Our team will then review each candidate’s potential to succeed in the role. This step may take some time because we want to find the right fit for both you and us-but you can count on us to keep you updated.
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