Sr Software Engineer (React,Node)

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