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Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Senior Fullstack Developer - **Company:** Lean Solutions Group, LLC - **Location:** Washington, DC, United States - **Experience:** Expert - **Contract:** Permanent contract - **Skills:** HTML, JavaScript (Programming Language), Artificial Intelligence, Application Integration Architecture, Microsoft Azure, Cascading Style Sheets (CSS), Data Structures, Database Design, Software Debugging, Software Design Patterns, Distributed Systems, PostgreSQL, MongoDB, MySQL, Node.Js, NoSQL, Open Source Technology, Performance Tuning, Software Architecture, Redis, Cloud Services, Next.js, Software Engineering, TypeScript, Web Applications, Openapi, Javascript Build, Cloud Platform System, Spring Cloud, ReactJS, Large Language Models, Backend, Containerization, Webpack, Front End Software Development, React Redux, Restful APIs, Docker, Microservices - **Published:** July 22, 2026 - **Apply:** https://www.indeed.com/viewjob?jk=4b8ab82ba83ae398 ## About the Role To excel in this role, you should possess: * 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 * Strong knowledge of JavaScript build tools such as Webpack and modern bundlers * 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 ## Description We are seeking a highly skilled Senior Full-Stack JavaScript/TypeScript Engineer to join our engineering team. In this role, you will design, develop, and optimize modern web applications and distributed systems, contributing across the entire software development lifecycle. You will play a key role in architecting scalable solutions, building high-performance user interfaces, developing robust backend services, and driving engineering excellence through best practices and technical leadership. The ideal candidate combines deep expertise in modern JavaScript ecosystems with strong architectural thinking, AI agentic development, performance optimization experience, and a passion for building scalable, cloud-native applications. ## Related Videos - [Leveraging Real time data in FSIs](https://www.wearedevelopers.com/videos/806-leveraging-real-time-data-in-fsis) - [The Resilience of the World Wide Web](https://www.wearedevelopers.com/videos/1281-the-resilience-of-the-world-wide-web) - [Reducing LLM Calls with Vector Search Patterns - Raphael De Lio (Redis)](https://www.wearedevelopers.com/videos/1714-reducing-llm-calls-with-vector-search-patterns-raphael-de-lio-redis) - [Build and Deploy a Fullstack App with Open Source Tooling](https://www.wearedevelopers.com/videos/775-build-and-deploy-a-fullstack-app-with-open-source-tooling) - [NoLoJS - Avoiding JavaScript Cruft with HTML and CSS - Aaron T. 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