Full Stack Engineer

Lean Tech, a Lean Solutions Group Division; Long Beach (CA); On-site; USD 120,000 - 180,000; Full time

Job summary

Lean Tech, a Lean Solutions Group Division, is seeking a Senior Full Stack Developer in Long Beach, CA to design, build and scale web applications using TypeScript, React, Next.js and Node.js. You will implement robust REST APIs, data models, and performant UI components, collaborating closely with product and backend teams.

The role emphasizes cloud-native development with Docker on AWS, microservices patterns, and evaluating ML/AI integrations; leadership and mentoring are encouraged as you

Qualifications

• 6+ years of experience in Full-Stack (Backend - Frontend) TypeScript development.
• Experience building scalable full-stack applications and microservices using React, Next.js, Node.js, Express, HTML, and CSS.

Skills

Full-Stack development

TypeScript

React

Next.js

Node.js

REST API design

OpenAPI

SQL/NoSQL databases

Docker

AWS

AI/LLM integration

Tools

API design tools

DevTools

Job description

Position Title: Senior Full Stack Developer

Location: Long Beach, California, United States

What you will be doing:

Required Skills & Experience

• 6+ years of experience in Full-Stack (Backend - Frontend) TypeScript development
• Extensive experience building scalable full-stack applications and microservices using React, Next.js, Node.js, Express, HTML, and CSS
• Strong knowledge of RESTful API design and OpenAPI specifications
• Experience designing and integrating APIs, including REST and modern data-fetching patterns
• Extensive experience working with relational DBs like MySQL or Postgres and noSQL like MongoDB and Redis, with a solid understanding of data modeling trade-offs
• Familiarity with micro-frontend architecture and module federation
• Strong experience building performant React applications using hooks and state management libraries such as Redux
• Experience with cloud-native application development using Docker and containerized environments
• 1+ year hands-on experience integrating LLM APIs (OpenAI, Anthropic, or equivalent) into production or near-production systems
• Proficiency with Chrome DevTools and frontend performance profiling tools
• Experience creating AI agents that use tool-calling, function execution, and structured output.
• Strong experience with data structures, algorithms, and database design
• Proven experience in software architecture, design patterns, and engineering best practices
• Experience with aws cloud environments.
• Experience with ecommerce/retail systems.

Nice to Have:

• Experience with public cloud services (Azure and GCP)
• Experience with legacy applications migration to modern stack
• Contributions to open-source AI tooling or MCP ecosystem

Soft Skills:

• Strong problem-solving and debugging skills
• Excellent communication and collaboration abilities
• Ability to work independently and take ownership of projects
• Leadership and mentorship mindset
• Attention to detail and commitment to high-quality user experiences

Why you will love GTS:

• Join a powerful tech workforce and help us change the world through technology
• Professional development opportunities with international customers
• Collaborative work environment
• Career path and mentorship programs that will lead to new levels.