Senior Full-Stack Engineer, IAM & User Management

HighLevel; United States; Remote; USD 150,000 - 190,000; Full time

Job summary

HighLevel is seeking a seasoned Senior FullStack Engineer (SDE III) to join our Users Module team, where you’ll design and build scalable, secure user management systems across a multi-tenant SaaS platform. You’ll tackle authentication, authorization, and complex permission hierarchies while collaborating with product, security and platform teams.

This remote-first role values initiative and clear communication as you mentor juniors, participate in architecture discussions, and help optimize

Qualifications

• 4+ years in backend engineering, preferably building user management systems.
• Proven work on authentication/authorization and IAM systems.
• Experience with multi-tenant SaaS and enterprise user workflows & permissions.

Responsibilities

• Write clean, maintainable code in TypeScript/JavaScript.
• Build and maintain robust RESTful APIs for user management and authentication.
• Design scalable multi-tenant user data models and schemas.
• Implement OAuth, JWT, and secure session management.
• Design and implement IAM v2 systems with RBAC and granular permissions.
• Build features like user impersonation, delegation, and permission templates.
• Create and manage token validation and session lifecycle flows.
• Architect scalable models using MongoDB, Firestore, and SQL.
• Integrate Elasticsearch for advanced user search and filtering.
• Sync user data across multiple stores and implement audit logging.
• Build secure auth flows with encryption, token validation, and data privacy controls.
• Ensure compliance with GDPR and similar regulations.
• Create audit trails and compliance reporting for user actions.
• Optimize queries, implement caching strategies, and handle high-volume user operations.
• Build systems that scale across enterprise-grade customer environments.
• Partner with product, security, and platform teams to deliver features.
• Collaborate with DevOps on deployment and infrastructure.
• Mentor junior engineers and participate in architecture discussions and code reviews

Skills

TypeScript

JavaScript

Node.js

NestJS

Express.js

MongoDB

Firestore

SQL

OAuth 2.0

JWT

RBAC

IAM

Elasticsearch

Microservices

Event-driven

GCP

CI/CD

Caching

Git

Google Cloud Pub/Sub

Tools

Git

Google Cloud Pub/Sub

Job description

HighLevel is seeking a seasoned Senior FullStack Engineer (SDE III) to join our Users Module team, where you’ll design and build scalable, secure user management systems across a multi-tenant SaaS platform. You’ll tackle authentication, authorization, and complex permission hierarchies while collaborating with product, security and platform teams.

This remote-first role values initiative and clear communication as you mentor juniors, participate in architecture discussions, and help optimize