Senior Full stack .NET & React

About the role

As a Senior .NET Full Stack Engineer, you will make an impact by designing and delivering scalable, secure, and high-performance web applications that support critical business operations. You will be a valued member of the Engineering team and work collaboratively with product owners, architects, DevOps, and quality engineering teams to build modern, maintainable solutions aligned with enterprise standards.

In this role, you will:

• Design and develop end-to-end technical solutions using ASP.NET Core Web API, .NET Core, and React.js, ensuring scalability, maintainability, and alignment with enterprise standards.
• Build and optimize high-quality backend APIs, ensuring secure data handling, efficient database interactions, and reliable integration with internal and external services.
• Develop dynamic and reusable React.js UI components that deliver intuitive user experiences and maintain cross-browser consistency and accessibility.
• Drive application performance optimization through API tuning, database query improvements, and system profiling to support high-volume transactional environments.
• Ensure adherence to secure coding practices, including authentication, authorization, input validation, and secure configuration.
• Lead code reviews and technical mentoring, providing guidance on best practices, performance, and clean code standards.
• Collaborate with cross-functional teams to refine requirements, estimate delivery, and support agile execution across sprint cycles.
• Support production readiness and incident resolution, including deployment support, monitoring, and post-release issue management.

Work model

We believe hybrid work is the way forward as we strive to provide flexibility wherever possible. Based on this role’s business requirements, this is a hybrid position requiring 2–3 days per week in a client or Cognizant office. Regardless of your working arrangement, we are here to support a healthy work-life balance through our various wellbeing programs.

The working arrangements for this role are accurate as of the date of posting. This may change based on the project you’re engaged in, as well as business and client requirements. Rest assured; we will always be clear about role expectations.

What you need to have to be considered

• 7–11 years of experience in software development within enterprise environments
• Strong hands-on expertise in ASP.NET Core Web API, .NET Core, and React.js
• Proven experience designing and building RESTful APIs, including data modeling and integration with relational databases
• Experience building modern single-page applications (SPA) using React.js, including state management and component design
• Solid understanding of secure coding practices, performance tuning, and troubleshooting in high-traffic systems
• Experience working in agile environments, including sprint planning, backlog refinement, and CI/CD workflows

These will help you stand out

• Experience in cards, payments, or financial services domains, including transaction lifecycle and compliance considerations
• Exposure to microservices architecture and integration patterns using REST APIs

• Experience working with DevOps tooling, build pipelines, and automated testing strategies

• Understanding of monitoring, logging, and observability practices

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.

Compensation

The annual salary for this position ranges from $80,000 to $93,500, depending on experience and qualifications. This role is also eligible for Cognizant’s discretionary annual incentive program, subject to performance and applicable plan terms.

Disclaimer: The salary, other compensation, and benefits 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.

We’re excited to meet people who share our passion for technology and innovation and who can make an impact in a variety of ways. Don’t hesitate to apply, even if you meet most—but not all—of the requirements. We value transferable skills, diverse experiences, and fresh perspectives.

This position does not offer visa sponsorship. Candidates must be authorized to work without sponsorship now or in the future, including OPT, CPT, or any other work authorization requiring employer sponsorship.