Principal System Engineer; Full-Stack

Join AT&T and reimagine the communications and technologies that connect the world. Our Consumer Technology experience team is delivering innovative and reliable technology solutions to power differentiated, simplified customer experiences. Bring your bold ideas and fearless risk-taking to redefine connectivity and transform how the world shares stories and experiences that matter. When you step into a career with AT&T, you won’t just imagine the future—you’ll create it.

As part of our team, you’ll transform the way we deliver a seamless customer experience with digital at the center of all you do. In our world, digital is much larger than just an eCommerce channel; we are transforming all channels to digitally perform as one team to create a better customer experience. In 2025, the digital transformation will revolutionize the digital space, and you can build a career that will propel your future.

We are looking for a Principal System Engineer (
Full Stack
) who has hands-on experience with both front-end (UI) and back-end technologies.

• Act as a Principal Systems Engineer, leveraging deep expertise and hands-on involvement to lead solution development from initial concept to final delivery, with ownership of outcomes.
• Proactively design, build, and optimize robust, scalable micro-frontend (MFE) web applications using React JS/Next JS for dynamic Frontend experiences, and Graph
  
  QL, Java, API and NodeJS for modern Backend for Frontend (BFF) layers.
• Demonstrate a self-driven approach by consistently seeking innovative solutions, setting high standards for quality, and championing continuous improvement.
• Collaborate closely with UX/UI Designers to deliver user experiences that exceed expectations for quality, innovation, and usability.
• Lead by example as a technical expert and mentor, inspiring and empowering engineers across multiple teams through active knowledge sharing, innovation, and rigorous code reviews.
• Harness AI assistants throughout the SDLC - turning concepts into user stories, stories into code, and automating testing and deployment, maximizing productivity, accelerate testing and development, and streamline agile workflows.
• Partner with Application and Domain Architecture teams to ensure solutions are secure, scalable, maintainable, and positioned for long-term success.
• Relentlessly pursue performance excellence, proactively improving DORA metrics and website performance using advanced monitoring tools such as Dynatrace, Quantum Metrics, and Splunk.
• Own the detailed design and architecture process, maintaining a sharp focus on scalability, security, and availability for all applications and processes.
• Set and uphold the highest standards in design, coding, testing, debugging, and documentation, while advocating for best practices in development, quality assurance, and security.
• Ensure all solutions meet or exceed critical non-functional requirements (NFRs) and industry best practices.
• Actively partner with cross-functional teams—including Platform, Dev Ops/SRE, Enterprise Architecture, and UX/UI—to deliver innovative, high-performance web solutions.
• Exhibit a sense of urgency and ownership in troubleshooting and resolving complex code-level issues, applying deep technical expertise and a solutions-oriented mindset to every challenge.
• Continuously seek feedback, measure impact, and adapt strategies to achieve superior results for the organization and its customers.
• Guide cross-functional teams in executing multiple complex initiatives, delivering consistent results and maintaining high standards across all efforts.

• Bachelor's or master's degree program in Computer Science, Computer Engineering, or a related field (or equivalent experience).
• Extremely motivated, highly passionate, and curious about new technologies. Take pride in your work and strive to achieve incredible results and possess superb communication and planning skills.
• 10+ years of proven experience building high performance applications and APIs in Azure, Hybrid cloud environments at large scale.
• Preferably Next.js on the UI with Node.js on the backend, or React.js on the UI with Java…