Staff Software Engineer, Full-Stack

**This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Staff Software Engineer, Full-Stack based in the United States.** This role offers the opportunity to shape the architecture and technical direction of a mission-driven technology platform. You will take ownership of complex engineering challenges across frontend, backend, infrastructure, security, and scalability. Working within a small, remote engineering team, you will have direct influence on technical decisions and product evolution. The position is ideal for a senior engineer who enjoys building high-quality systems in an early-stage environment. You will help establish engineering standards, mentor teammates, and drive improvements across the entire development lifecycle. This is a hands-on leadership role for someone passionate about modern technologies, AI-assisted development, and impactful software solutions. ### Accountabilities: As a Staff Software Engineer, Full-Stack, you will lead technical initiatives while remaining deeply involved in implementation, architecture, and engineering excellence. Your responsibilities will include: - Owning and evolving the platform architecture by assessing existing systems, identifying improvements, and driving technical decisions across data layers, APIs, frontend applications, and deployment infrastructure. - Building and maintaining production-quality applications across the full stack using technologies such as React, TypeScript, Node.js/NestJS, PostgreSQL, and AWS. - Designing scalable multi-tenant systems with strong approaches to tenant isolation, data partitioning, role-based access control, and configurable workflows. - Embedding security principles throughout the development process, including authentication, authorization, encryption, validation, API protection, and compliance readiness. - Improving system performance through profiling, benchmarking, optimization of database queries, caching strategies, frontend performance, monitoring, and alerting. - Architecting solutions that support future growth through scalable infrastructure, asynchronous processing, load management, and efficient resource utilization. - Establishing engineering standards, best practices, development patterns, and quality expectations that support future team growth. - Mentoring engineers through design reviews, technical collaboration, code reviews, and knowledge sharing. - Evaluating and adopting modern engineering tools, including AI-assisted development solutions, to improve productivity and development workflows. - Staying current with emerging trends in software engineering, infrastructure, AI development tools, and technical practices. - Supporting broader team initiatives when needed, including DevOps improvements, debugging, customer issues, hiring activities, and other engineering priorities. **Requirements:** The ideal candidate is an experienced full-stack engineer with strong architectural expertise, a security-focused mindset, and the ability to thrive in a fast-moving environment. You should bring: - 8+ years of professional software engineering experience, including significant experience building scalable full-stack web applications. - Proven experience working in high-ambiguity environments where priorities shift quickly and engineers take ownership of outcomes. - Deep knowledge of modern web technologies, with expertise across areas such as React, TypeScript, Node.js/NestJS, PostgreSQL, and AWS. - Demonstrated ability to define system architecture, make foundational technical decisions, and improve existing platforms. - Strong understanding of application security principles, including OWASP Top 10, authentication, authorization, threat modeling, and secure system design. - Experience identifying and resolving performance challenges across databases, APIs, frontend applications, and infrastructure. - Strong product delivery mindset with the abi…