Job Title: Sr Software Engineer (Node, React)
Job Type: Permanent Full Time
Location: St Louis, Missouri, United States
Description:
Sr Software Engineer (Node, React)
Position Description
Systemone is looking for a talented and experienced Full Stack Developer who enjoys building modern, high-impact web applications end-to-end. In this role you’ll work across the stack using React, Node.js, Next.js, NestJS and Postgres to deliver scalable, performant products that directly impact users.
You'll have a strong voice in technical decisions, collaborate closely with product and design, and help shape both architecture and engineering culture. If you like ownership, solving real-world problems, and working with a pragmatic, modern tech stack—this is a great fit.
This position requires someone who is local to St. Louis, MO and willing to work on-site three days per week.
Your future duties and responsibilities
• Design, build, and maintain full-stack applications using React, Next.js, Node.js, NestJS, and Postgres
• Develop scalable APIs and backend services
• Collaborate with product managers and designers to translate requirements into technical solutions
• Write clean, maintainable, and well-tested code
• Optimize applications for performance, scalability, and reliability
• Participate in code reviews and mentor junior engineers
• Contribute to architectural decisions and technical strategy
• Troubleshoot, debug, and improve existing systems
Required qualifications to be successful in this role
• 5+ years professional experience software engineer experience
• Must have strong experience in:
• React (modern hooks, state management)
• Node.js (API development, backend architecture)
• Next.js (SSR/SSG, routing, performance optimization)
• Postgres (data modeling, query optimization)
• Experience building and deploying production-grade web applications in a cloud environment (AWS strong preferred)
• Solid understanding of RESTful APIs and web architecture
• Familiarity with version control (Git) and CI/CD workflows
• Strong problem-solving and debugging skills
• Strong full-stack engineering mindset
• Ability to own features from concept to production
• Clear and effective communication
• Collaboration across cross-functional teams
• Attention to detail and code quality
• Problem-solving and analytical thinking
Every day, System One focuses on services and solutions that require a high degree of specialization, in-demand technical skills, and large-scale operational expertise. We are essential partners to those on the front lines of our nation’s most critical infrastructure, technology, and life sciences initiatives.
Founded more than 40 years ago as a staffing partner to the engineering industry, today System One is a diversified organization operating in over 50 locations and putting more than 9,000 people to work in the United States, Canada, and the United Kingdom.