Senior Full Stack AI Engineer

Scale Army Careers; United States; Remote; USD 140,000 - 190,000; Full time

Job summary

Scale Army Careers is seeking a Senior Full Stack AI Engineer to own and stabilize an advanced internal CRM used by the sales team. You will audit the current codebase, fix gaps, and deliver production-ready features across lead management, communications, and admin tools.

The role is fully remote with EST hours and requires hands-on work in a multi-tenant, AI-enabled environment. You will integrate AI features using OpenAI and Anthropic APIs, maintain real-time capabilities with Redis and

Qualifications

• Senior-level full-stack software engineering experience.

Responsibilities

• Take ownership of the existing internal CRM across Node.js/Express backend and React frontend.

Skills

Node.js

Express

React

MongoDB

OpenAI API

Anthropic API

Redis

Socket.IO

GitHub Actions

Twilio Voice

Tools

OpenAI SDK

Anthropic SDK

Twilio Voice SDK

Render

Cloudflare Pages

AWS S3

MongoDB Atlas

GitHub

Job description

_ This role is open to candidates based in LATAM, Africa, and Eastern Europe. Please note that as this role supports U.S.-based clients, candidates must be available to work during U.S. business hours aligned with the client’s time zone. _

The Senior Full Stack AI Engineer will take ownership of an advanced internal CRM and continue building the systems that support the company’s sales organization.

The immediate focus will be completing and stabilizing the existing CRM, which already includes calling, texting, real-time functionality, and AI-enabled features. The Senior Full Stack AI Engineer will audit the existing codebase, identify remaining work, address gaps and risks, and bring the platform to a reliable, production-ready state.

This is a hands-on full-stack engineering role, not a no-code automation position. The engineer must be able to independently work within an existing codebase, make technical decisions, and own work from start to finish.

Location

Fully Remote | 9:00 AM - 5:00 PM EST

Key Responsibilities

CRM Ownership & Development

• Take ownership of the existing internal CRM across the Node.js and Express backend and React frontend.

• Audit the existing codebase to identify gaps, bugs, technical debt, security risks, and incomplete functionality.

• Build a clear plan for completing and stabilizing the CRM after reviewing the existing architecture.

• Develop, test, and maintain features across lead management, communications, agent workflows, reporting, and administrative tools.

• Debug and resolve issues affecting live applications.

AI Implementation

• Maintain and improve AI functionality using OpenAI and Anthropic APIs.

• Work within the existing agentic tool gateway, including tool permissions, policy controls, and safety restrictions.

• Support future AI implementation projects as the business evolves.

Real-Time Communications

• Maintain real-time functionality powered by Redis, Socket.IO, and Twilio Voice.

• Support the communications functionality built into the CRM, including calling and texting.

Security & Data Protection

• Protect customer and agent data through strong authentication, authorization, validation, logging, and tenant-isolation practices.

• Maintain and improve the security and reliability of the platform.

Infrastructure & Deployment

• Manage deployments and infrastructure across Render, Cloudflare, AWS S3, MongoDB Atlas, GitHub, and GitHub Actions.

• Maintain and improve CI/CD and production deployment processes.

• Support a stable release process for the CRM.

Internal Systems Development

• Work directly with the founder and operations manager to translate business requirements into technical solutions.

• Build the next internal systems, including a licensing and onboarding platform to replace the current GoHighLevel process.

• Support additional internal systems and operational technology projects as the business evolves.

Qualifications

Experience

• Senior-level full-stack software engineering experience.

• Strong hands-on experience with Node.js, Express, React, and MongoDB.

• Experience taking over, auditing, and improving an existing production codebase.

• Experience building and maintaining secure, multi-tenant applications.

• Hands-on experience integrating OpenAI, Anthropic, or comparable LLM APIs into production products.

• Experience with GitHub, CI/CD, production deployments, and debugging live applications.

• Experience with Twilio Voice, browser-based calling, or programmable communications is a plus.

• Experience building CRMs, sales platforms, onboarding tools, learning platforms, or internal operations systems is a plus.

• Experience with TCPA-sensitive communications, call recording, auditability, or regulated-industry workflows is a plus.

• Experience moving workflows from GoHighLevel or similar tools into custom software is a plus.

• Experience reviewing and improving AI-assisted code is a plus.

Skills

• Strong proficiency with Node.js, Express, React, and MongoDB.

• Strong understanding of authentication, authorization, data privacy, validation, and testing.

• Ability to independently audit an existing codebase and determine the work required to stabilize and complete it.

• Ability to make technical decisions without day-to-day engineering oversight.

• Ability to own technical work from start to finish.

• Experience working with real-time technologies including Redis and Socket.IO.

• Experience managing production deployments and infrastructure.

• Ability to translate business requirements into technical solutions.

• Ability to manage changing priorities while maintaining security and reliability.

Technical Environment

• Node.js and Express

• React

• Vite

• Tailwind CSS

• TanStack React Query

• Zustand

• React Router

• Axios

• Framer Motion

• Recharts

• MongoDB Atlas

• Mongoose

• Redis

• Socket.IO

• JWT authentication

• bcrypt

• TOTP 2FA

• Zod

• Sentry

• Morgan

• OpenAI SDK

• Anthropic SDK

• Twilio Voice SDK

• Render

• Cloudflare Pages

• Cloudflare CDN

• AWS S3

• GitHub

• GitHub Actions

What Success Looks Like

First 30 Days

• Become fully familiar with the existing CRM, codebase, infrastructure, and business workflows.

• Complete a technical audit of the existing platform.

• Identify the highest-priority risks and remaining work.

• Resolve immediate issues.

• Create a clear plan for completing the platform.

By 60 Days

• Complete or actively deliver the highest-priority CRM functionality against a clear plan.

• Improve the reliability of core workflows.

• Strengthen gaps in testing, security, documentation, monitoring, or deployment processes.

By 90 Days

• Operate as the primary technical owner of the CRM.

• Establish a stable release process and clear roadmap for future development.

• Be positioned to begin supporting the internal licensing and onboarding system.

• Begin supporting additional AI implementation projects across the business.

Opportunity

The Senior Full Stack AI Engineer will have the opportunity to become a key technical owner within the business, beginning with an advanced internal CRM and expanding into additional internal systems, including licensing, onboarding, agent training, and AI implementation projects.