Critical Mass is looking for a Senior Front End Developer to join the team supporting AT&T’s internal SharePoint platforms. In this role, you will build and maintain custom front-end components using React.js within SharePoint Framework (SPFx), delivering high-performance and maintainable solutions integrated with Microsoft 365 and external systems.
What You'll Do
- Develop and maintain SPFx solutions using React.js within SharePoint Online
- Customize and extend SharePoint site functionality and front-end components
- Integrate SharePoint with external systems via REST APIs
- Optimize performance of components within strict platform constraints
- Collaborate with engineers, leads, and project stakeholders across geographies
- Support delivery within Agile/Kanban operating models
- Contribute to documentation and knowledge sharing
What We're Looking For
- 5–8 years of professional front-end development experience
- Strong proficiency with React.js, modern JavaScript (ES6+), and TypeScript
- Deep understanding of SharePoint architecture, including lists, libraries, and permissions
- Experience with SharePoint Framework (SPFx)
- Familiarity with CI/CD principles and deployment constraints in enterprise environments
- Strong communication skills and team collaboration experience
- Proficient in English (written and verbal)
Nice to Have
- Basic knowledge of Azure Active Directory and Azure Functions
- General awareness of the Power Platform (Power Automate, Power Apps)
- Experience working in compliance-heavy environments
- Background in enterprise-level support or software enhancement projects
Technical Stack
- React.js, SharePoint Framework (SPFx), TypeScript, JavaScript (ES6+)
- SharePoint Online, REST APIs, Microsoft 365
Benefits & Compensation
- Maternity and parental leave extra days
- Competitive benefits packages
- Vacation, compassionate leave, sick days, and flex days
- Access to online services for families and new parents
- Diversity and Inclusion Board with 12 affinity groups
- Internal learning and development programs
- Enterprise-wide employee discounts
Work Mode
This position follows a hybrid work model.
Critical Mass is an equal opportunity employer.
