AI Fullstack Senior Software Engineer (MERN Stack)

About Gen: Gen is a global company dedicated to powering Digital Freedom through its trusted consumer brands including Norton, Avast, LifeLock, MoneyLion and more. Our combined heritage is rooted in financial empowerment and cyber safety for the first digital generations, and today we deliver award-winning cybersecurity, online privacy, identity protection and financial wellness solutions to nearly 500 million users in more than 150 countries. Together, we share a collective passion and vision to protect consumers and help them grow, manage and secure their digital and financial lives. We’re always looking for smart, fearless and high-impact talent who see AI as a teammate – leveraging it to move faster and deliver meaningful results. When you’re part of Gen, you’ll have the flexibility, tools and support to do your best work and grow your career – from flexible working options and time off to competitive pay, benefits and well-being programs. At Gen, we are scrappy and relentlessly customer driven. We create room for healthy debate, experimentation and continuous learning, and we seek out people with different experiences, identities and ideas to join our team. You’ll work with people who back each other, respect each other and understand that our differences are a competitive advantage. If this sounds like you, we’d love you to be part of Gen. About the role: We are looking for an AI Fullstack Senior Software Engineer with strong MERN stack expertise and a passion for building modern, intelligent, scalable web applications. You will be part of a high-impact engineering team, contributing to customer-facing products and internal platforms while embedding AI-first development practices into day-to-day engineering. This role is execution focused: you will lead the design and delivery of high-quality fullstack solutions across frontend, backend, APIs, and cloud-integrated workflows, while helping shape technical direction and engineering standards. Key Responsibilities: • Lead the design, development, and delivery of complex fullstack web applications using MongoDB, Express.js, React, and Node.js. • Build responsive, performant, and reusable frontend components using React, modern JavaScript/TypeScript, HTML, and CSS. • Develop scalable backend services, REST APIs, and microservices using Node.js and Express. • Design and optimize data models, queries, and integrations using MongoDB and related persistence patterns. • Own technical solutions end-to-end, from architecture and development to testing, deployment, observability, and post-release improvements. • Operate as an end-to-end engineer who can independently drive complex feature development, unit testing, debugging, functional validation, and production readiness. • Apply AI-assisted engineering tools such as GitHub Copilot, Cursor, Claude Code, and similar platforms to accelerate coding, debugging, documentation, test creation, and root-cause analysis. • Drive AI-first practices within the team by identifying repeatable workflows where AI can improve developer efficiency, speed, quality, and maintainability. • Integrate AI-powered capabilities into products where relevant, including LLM-based workflows, intelligent assistants, recommendations, automation, or developer tooling. • Write and maintain strong unit, integration, and end-to-end test coverage using modern testing frameworks across frontend and backend stacks. • Build and improve CI/CD pipelines using GitHub Actions, Jenkins, TeamCity, or equivalent tooling to enable reliable builds and releases. • Monitor application health, reliability, and performance using logs, dashboards, tracing, and alerting tools, and proactively drive improvements. • Partner closely with Product, Design, Data, Security, and platform teams to deliver cohesive and high-quality customer experiences. • Participate in code reviews, design reviews, and technical discussions, while mentoring junior engineers and helping raise engineering standar