Senior Backend Engineer (IAM, Node.js, Python, API Security & Consumption Systems)
Title: Senior Backend Engineer – IAM, Node.js, Python, API Security, Multi-Tenant SaaS (Urgent)
Job Type: Freelance / Remote
Experience Required: 4–10 Years
Location Preference: India Remote
About the Role
We are seeking a highly skilled Senior Backend Engineer with strong expertise in IAM, Node.js, Python performance optimization, API Security, and multi-tenant usage/consumption tracking systems.
This is a critical production stabilization role that directly impacts system performance, reliability, and revenue integrity across multiple SaaS products.
Context
Our platform runs a centralized Identity & Access Management (IAM) system powering multiple applications, including:
WhatsApp Chatbot
AI Support & Automation Platforms
Email Campaign Engine
LinkedIn Posting & Automation
Admin Dashboards & Analytics
Two major production issues need urgent resolution:
Major Challenges to Solve
1. Python Performance Failure (High Severity)
IAM permission and consumption logic in Python has degraded API performance to ~30 seconds per request in production
Impacts chatbot responses, campaign execution & AI inference
Needs deep performance debugging & async optimization
2. API Consumption Tracking Failure (Prod Only)
Usage tracking works in Dev, fails only in Production
API hit metrics, package/module usage & token tracking not recorded
Likely related to gateway/middleware/caching/environment issues
Key Responsibilities
-Diagnose and fix Python performance bottlenecks to achieve sub-second latency
-Resolve Production-only consumption & billing tracking issues
-Ensure reliable IAM permission enforcement across Node.js services
-Strengthen multi-tenant architecture and quota enforcement
-Build audit-grade logs for usage tracking & billing compliance
-Improve caching strategy, route protection, and wildcard permission logic
-Work with AI, billing & frontend teams for system alignment
-Required Technical Skills
Must Have
Strong Node.js (Express.js / NestJS)
Strong Python (AsyncIO / FastAPI / Flask / Performance optimization)
IAM Models (RBAC/ABAC/PBAC)
Multi-tenant SaaS understanding
API Gateways, Middleware, Rate Limiting
Debugging across Dev/QA/Prod environments
API Security, JWT, OAuth
Good to Have
Redis cache & throttling
Kafka / Event streaming
Elasticsearch / Distributed logging
AI token consumption systems
Metered billing architecture
What Success Looks Like (60–90 Days)
Sub-second response time for IAM-based Python services
Production usage tracking fully restored
Accurate billing/consumption at module & artifact level
Consistent IAM permission enforcement across services
Zero Dev–Prod mismatches
Complete audit logging & tenant usage integrity
Why Work With Us
High-impact engineering challenge
Direct influence on platform stability & revenue
Long-term collaboration potential
Fast-decision hiring process
How to Apply
Please include:
Resume / Portfolio
Examples of similar performance optimization or IAM projects
Apply Now
Apply Now