Senior React Developer Jobs in Colorado (NOW HIRING)

Senior React Developer/Architect
Category: Software Development/ Engineering
Main location: United States, Colorado, Centennial
Position ID:J0426-1328
Employment Type: Full Time
U.S. - Technology as a force for good
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Position Description:
CGI is seeking a highly skilled Senior React Developer / Architect to join our CGI Team!
Support a client-facing digital initiative in the Denver, CO (Centennial) area. This is a hands-on consulting role focused on designing and delivering high-quality, scalable, and high-performance front-end solutions using React and TypeScript.
This position is based at the client site (Centennial, CO) and requires onsite presence Tuesday through Thursday each week.
The ideal candidate brings deep front-end engineering expertise, strong architectural judgment, and the ability to collaborate closely with UX designers, backend engineers, and cross-functional stakeholders to deliver enterprise-grade digital applications.
Your future duties and responsibilities:
How you'll make an impact
- Design and implement modular, high-quality front-end features using React and TypeScript
- Define and maintain scalable front-end architecture to support long-term maintainability and growth
- Develop reusable Node.js modules and shared libraries to promote cross-project consistency
- Build intuitive, accessible user interfaces using Material UI or comparable design systems
- Integrate applications with RESTful and/or GraphQL APIs, optimizing data access and state management
- Implement comprehensive UI testing strategies using tools such as Jest, Cypress, and React Testing Library
- Optimize build performance and bundle efficiency using modern tooling (e.g., Webpack)
- Ensure solutions meet enterprise standards for performance, accessibility, and security
- Partner with backend engineers to define API contracts and improve data-fetching strategies
- Troubleshoot complex UI, caching, and state management issues
- Contribute to technical design discussions, conduct code reviews, and mentor junior developers
- Stay current with emerging front-end trends, frameworks, and best practices
Required qualifications to be successful in this role:
What you'll bring
- 10+ years of front-end engineering experience, including significant production experience with React
- Deep proficiency in TypeScript, with a strong understanding of scalable typing patterns and coding standards
- Professional experience with Express.js and Next.js
- Experience with AEM or Sitecore
- Experience implementing enterprise UI design systems such as Material UI or similar frameworks
- Working knowledge of Node.js, including development of shared packages or internal libraries
- Hands-on experience implementing automated front-end testing strategies
- Strong understanding of modern build tooling, module bundling, tree shaking, and performance optimization techniques
- Experience with state management libraries such as Redux, Zustand, Recoil, or similar
- Proven ability to improve application performance through lazy loading, code splitting, and bundle optimization
- Experience integrating RESTful services and/or GraphQL APIs with efficient data handling strategies
- Familiarity with CI/CD pipelines and front-end release management practices
- Strong analytical and troubleshooting skills in complex client-side environments
- Excellent communication skills and ability to collaborate across product, design, engineering, and business teams
Strongly Preferred
- Experience with SPA Editor
- Familiarity with server-side rendering frameworks such as Next.js
- Experience working within micro-frontend or modular front-end architectures
- Knowledge of accessibility standards (WCAG) and advanced front-end performance optimization techniques
- Prior consulting or client-facing experience
Other Information:
CGI is required by law in some jurisdictions to include a reasonable estimate of the compensation range for this role. The determination of this range includes various factors not limited to skill set, level, experience, relevant training, and licensure and certifications. To support the ability to reward for merit-based performance, CGI typically does not hire individuals at or near the top of the range for their role. Compensation decisions are dependent on the facts and circumstances of each case. A reasonable estimate of the current range for this role in the U.S. is $98,500.00 - $172,400.00.
CGI's benefits are offered to eligible professionals on their first day of employment to include:
. Competitive compensation
. Comprehensive insurance options
. Matching contributions through the 401(k) plan and the share purchase plan
. Paid time off for vacation, holidays, and sick time
. Paid parental leave
.Learning opportunities and tuition assistance
. Wellness and Well-being programs
CGI CSG anticipates accepting applications for this position through 2026-05-28.
#LI-RS2
Skills:

• Adobe Experience Manager AEM
• Angular
• Front End Development
• Front End Development
• Front-end Architecture
• React JavaScript
• SASS
• Storybook
• Typescript
• WebPack

What you can expect from us:
Together, as owners, let's turn meaningful insights into action.
Life at CGI is rooted in ownership, teamwork, respect and belonging. Here, you'll reach your full potential because...
You are invited to be an owner from day 1 as we work together to bring our Dream to life. That's why we call ourselves CGI Partners rather than employees. We benefit from our collective success and actively shape our company's strategy and direction.
Your work creates value. You'll develop innovative solutions and build relationships with teammates and clients while accessing global capabilities to scale your ideas, embrace new opportunities, and benefit from expansive industry and technology expertise.
You'll shape your career by joining a company built to grow and last. You'll be supported by leaders who care about your health and well-being and provide you with opportunities to deepen your skills and broaden your horizons.
Come join our team-one of the largest IT and business consulting services firms in the world.
Qualified applicants will receive consideration for employment without regard to their race, ethnicity, ancestry, color, sex, religion, creed, age, national origin, citizenship status, disability, pregnancy, medical condition, military and veteran status, marital status, sexual orientation or perceived sexual orientation, gender, gender identity, and gender expression, familial status or responsibilities, reproductive health decisions, political affiliation, genetic information, height, weight, or any other legally protected status or characteristics to the extent required by applicable federal, state, and/or local laws where we do business.
CGI provides reasonable accommodations to qualified individuals with disabilities. If you need an accommodation to apply for a job in the U.S., please email the CGI U.S. Employment Compliance mailbox at US_Employment_Compliance@cgi.com. You will need to reference the Position ID of the position in which you are interested. Your message will be routed to the appropriate recruiter who will assist you. Please note, this email address is only to be used for those individuals who need an accommodation to apply for a job. Emails for any other reason or those that do not include a Position ID will not be returned.
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All CGI offers of employment in the U.S. are contingent upon the ability to successfully complete a background investigation. Background investigation components can vary dependent upon specific assignment and/or level of US government security clearance held. Dependent upon role and/or federal government security clearance requirements, and in accordance with applicable laws, some background investigations may include a credit check. CGI will consider for employment qualified applicants with arrests and conviction records in accordance with all local regulations and ordinances.
CGI will not discharge or in any other manner discriminate against employees or applicants because they have inquired about, discussed, or disclosed their own pay or the pay of another employee or applicant. However, employees who have access to the compensation information of other employees or applicants as a part of their essential job functions cannot disclose the pay of other employees or applicants to individuals who do not otherwise have access to compensation information, unless the disclosure is (a) in response to a formal complaint or charge, (b) in furtherance of an investigation, proceeding, hearing, or action, including an investigation conducted by the employer, or (c) consistent with CGI's legal duty to furnish information.