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Sr. Fullstack Engineer

James Consultancy Services , LLC

Mountain View, CA • $60.00 to $90.00 / hr • 9/18/2026

Job Description

Job Description

Role Overview

We are seeking a highly skilled Full Stack Tech Lead with deep expertise in

backend development to lead the design, development, and optimization of scalable,

high-performance web applications. The ideal candidate combines technical excellence in

React, NodeJS, and AWS with strong leadership skills to guide engineering teams, ensure

architectural soundness, and deliver business-critical solutions.

Responsibilities

Architecture & Development

Translate business and technical requirements into well-designed, architected

software services and user-facing applications.

Lead the end-to-end development lifecycle across frontend and backend

systems.

Design and implement scalable, reusable, and high-quality code using NodeJS

and modern ReactJS principles.

Build backward-compatible, flexible APIs for seamless service integrations.

Integrate APIs, databases, and cloud services with UI components.

Ensure applications follow responsive design principles and deliver a world-class

user experience.

Quality & Performance

Establish and enforce unit test coverage of 80%+ and maintain automation

across testing pipelines.

Write and maintain functional tests for mission-critical features.

Debug, troubleshoot, and optimize performance across applications and

services.

Perform root cause analysis and resolve production issues promptly.

Leadership & Collaboration

Lead code reviews, provide technical mentorship, and enforce best practices

across the team.

Collaborate cross-functionally with product managers, designers, and other

stakeholders.

Stay plugged into emerging technologies, frameworks, and industry trends to

continuously evolve the tech stack.

Facilitate brainstorming sessions to solve complex infrastructure, scalability, and

security challenges.

Required Skills & Qualifications

8–10 years of professional experience as a Full Stack Engineer.

Expert proficiency in JavaScript (ES6+), NodeJS, ReactJS, and Express.

Strong knowledge of SQL and relational databases (preferably PostgreSQL).

Experience with RESTful APIs, microservices architecture, and backend integrations.

Proficiency with AWS cloud services and DevOps workflows.

Hands-on expertise with Git/GitHub workflows.

Experience writing and maintaining unit and functional tests.

Strong understanding of HTML5, CSS3, and modern frontend build tools (Webpack,

Babel, NPM/Yarn).

Demonstrated experience leading engineering teams or projects.

Desired Skills & Qualifications

Bachelor’s degree in Computer Science, Engineering, or related field (or equivalent

experience).

Experience designing CI/CD pipelines (Jenkins, GitHub Actions, AWS pipelines).

Familiarity with Redux, React Hooks, and state management best practices.

Knowledge of security, scalability, and performance optimization patterns.

Prior experience working with ERP, CMS, or large-scale enterprise systems.

Strong communication skills with the ability to engage stakeholders