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Senior Developer

Senior SharePoint + React Developer for AT&T's internal platforms.
Critical Mass
Hybrid
On-Site
United States
Undisclosed salary
Job Description

Critical Mass is seeking a Senior SharePoint + React Developer to support AT&T's internal SharePoint platforms. The developer will be responsible for building and maintaining custom front-end components using React.js within SharePoint Framework (SPFx). The ideal candidate will deliver high-performance and maintainable solutions that integrate with Microsoft 365 and external systems. They should also possess strong technical capabilities in React and SharePoint development, familiarity with enterprise environments, and excellent communication skills for client interaction.

Role Involves:

  • Developing and maintaining SPFx solutions using React.js within SharePoint Online
  • Customizing and extending SharePoint site functionality and front-end components
  • Integrating SharePoint with external systems via REST APIs
  • Optimizing performance of components within strict platform constraints
  • Collaborating with engineers, leads, and project stakeholders across geographies
  • Supporting delivery within Agile/Kanban operating models
  • Contributing to documentation and knowledge sharing

Requirements:

  • Proficient in English (written and verbal)
  • 5+ 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
  • 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 enhancement projects

What Critical Mass Offers:

  • 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
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Critical Mass

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