Senior Python Backend Developer

About BabyBillion

BabyBillion is one of the fastest-growing kids' content companies in the world. With over 1 billion monthly views, we are on a mission to become the world’s #1 kids' content channel by December 2025. We create world-class educational and entertaining videos that captivate preschool audiences globally. We are looking for a highly creative and data-driven Scriptwriter to join our passionate team and help us scale our storytelling to new heights.

Job Summary

We are seeking an experienced Senior Python Backend Developer to join our team. In this role, you will be instrumental in designing, building, and scaling our high-performance backend systems. The ideal candidate has a strong background in creating robust APIs, integrating key services, and architecting solutions for high-traffic applications. You will take a leading role in enhancing our platform, migrating to a microservices architecture, and mentoring junior developers.

Key Responsibilities

Design, develop, and maintain production-grade applications using FastAPI to support over 200 endpoints.

Build and secure RESTful APIs with robust versioning, documentation, and authentication mechanisms like JWT and OAuth .

Manage and optimize MongoDB databases, including writing complex aggregation pipelines.

Implement and manage asynchronous background tasks using Celery with Redis or RabbitMQ .

Integrate and maintain payment gateways such as Razorpay and Stripe .

Lead architectural improvements, including the migration from a monolithic to a microservices architecture.

Develop real-time features using WebSockets and design systems to handle 10,000+ concurrent users.

Implement automated testing, performance monitoring (e.g., OpenTelemetry), and system optimizations.

Mentor junior developers and contribute to architectural planning and best practices.

Required Skills & Experience

2+ years of professional experience in backend development.

Build product features from scratch , actively participating in architecture design and implementation.

Strong proficiency in Python , with expertise in asynchronous programming (async / await).

Proven experience building and scaling applications with FastAPI .

In-depth knowledge of MongoDB , including query optimization.

Solid understanding of authentication, security principles, and implementing JWT / OAuth.

Hands-on experience with background task processing using Celery .

Excellent problem-solving skills and a passion for writing clean, maintainable code.

Preferred Qualifications

Experience with microservices , event-driven architecture, and API gateways.

Familiarity with containerization ( Docker ) and CI / CD pipelines.

Knowledge of cloud platforms like AWS or GCP .

Exposure to AI / ML tools (e.g., ONNX Runtime), Kafka , or GraphQL .

Our Tech Stack

Language / Framework : Python 3.12+, FastAPI

Database : MongoDB (Motor)

Task Queues / Brokers : Celery, Redis, RabbitMQ

Payments : Razorpay, Stripe

AI / ML : ONNX Runtime, Rembg

Infrastructure : Docker, Gunicorn, Uvicorn

Monitoring : OpenTelemetry, Prometheus

Testing : Pytest