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Senior Fullstack Software Engineer (Remote - US) at Jobgether. This position is posted by Jobgether on behalf of a partner company. We are currently looking for a Senior Fullstack Software Engineer in the United States.. As a Senior Fullstack Software Engineer, you will design and develop scalable cloud-based applications that enhance operational workflows and customer experiences. You will work across both backend and frontend systems, collaborating with cross-functional teams to build robust SaaS solutions. Your work will directly impact efficiency, user satisfaction, and the adoption of innovative technologies. This role offers the opportunity to leverage AI-driven development tools, mentor other engineers, and contribute to long-term architectural decisions. You will thrive in a fast-growing, collaborative environment that values continuous learning, innovation, and purposeful impact.. . Accountabilities. In this role, you will:. . Design, implement, and maintain backend services using NestJS and frontend applications using NextJS.. . Optimize PostgreSQL databases, microservices architecture, and APIs for high performance and scalability.. . Collaborate with product and engineering teams to balance technical decisions with business objectives.. . Mentor engineers on SDLC best practices, design systems, and maintain clean, maintainable code.. . Leverage AI and agentic tools throughout the development lifecycle to enhance workflows and innovation.. . Support deployment processes by debugging, troubleshooting, and coordinating with DevOps and QA teams.. . Develop and maintain APIs and other backend functionality while adhering to scalable design principles.. . . Candidates should have:. . BS or MS in Computer Science, Engineering, or equivalent professional experience.. . 4+ years of experience building and debugging cloud-based, large-scale solutions.. . Strong understanding of SOLID principles, software design patterns, and Atomic Design principles.. . Professional experience with PostgreSQL (query optimization, migrations).. . Proficiency with TypeScript, JavaScript, NodeJS, NestJS, and frontend frameworks such as React or NextJS.. . Experience with Agile frameworks (Scrum, Kanban) and collaborative software development.. . Excellent communication, documentation, and teamwork skills.. . Ability to thrive in a fast-paced, collaborative, and evolving work environment.. . Preferred Skills & Experience:. . Experience building scalable SaaS applications and integrating third-party APIs.. . Familiarity with cloud platforms such as AWS or Google Cloud Platform.. . Demonstrated experience using AI tools to improve development workflows or decision-making.. . . Company Location: United States.