Backend Developer Internship

About the Role

You will build and own backend services, APIs, data pipelines, integrations, and background processing systems. You will be involved across the complete development cycle:

• Design
• Development
• Testing
• Deployment
• Monitoring
• Maintenance

Key Responsibilities

• Build scalable REST APIs using Python and FastAPI.
• Design and manage PostgreSQL databases, including schemas, indexes, migrations, and query optimization.
• Implement secure authentication and authorization using JWT, refresh tokens, and RBAC.
• Use Redis for caching, rate limiting, and session/token management.
• Build background jobs and queue-based systems using Celery, RQ, Arq, or similar technologies.
• Implement retries, failure handling, and reliable background processing.
• Process and parse real-world documents such as Excel files, PDFs, and emails.
• Build third-party integrations using Google APIs, OAuth, webhooks, WhatsApp, and payment APIs.
• Containerize applications using Docker and docker-compose.
• Write unit and integration tests.
• Participate in code reviews and maintain engineering quality.
• Implement structured logging and robust error handling.
• Debug production issues by investigating actual data and system behavior.

Requirements & Tech Stack

• 1+ years of professional backend development experience with Python.
• Strong hands-on experience with FastAPI, Django REST, or Flask.
• Strong understanding of asynchronous programming and concurrency.
• Strong PostgreSQL knowledge:
• Schema design
• Joins
• Indexes
• Transactions
• Migrations
• Query optimization
• Experience with Docker and docker-compose.
• Experience with Redis, caching, and basic pub/sub.
• Understanding of background workers and queues such as:
• Celery
• RabbitMQ
• Kafka
• Strong understanding of REST API design.
• Experience with Pydantic v2 and request validation.
• Knowledge of JWT, OAuth2, password hashing, RBAC, and secure API design.
• Good understanding of data structures, async programming, and concurrency.
• Experience with Git, pull requests, and code reviews.
• Strong debugging and problem-solving skills.
• Ability to work carefully with real-world data instead of making assumptions.

Good to Have

• SQLAlchemy 2.x and async drivers such as asyncpg.
• Alembic.
• Event-driven architecture.
• WebSockets and Server-Sent Events.
• Multi-tenant SaaS architecture.
• API rate limiting and audit logging.
• Full-text search and Elasticsearch.
• PyMuPDF, pandas, and openpyxl.
• File storage and pre-signed URLs.
• OWASP Top 10 and secure coding practices.
• Secrets management and encryption.
• Performance profiling and load testing using Locust or k6.
• pytest, factory patterns, and contract testing.

What You'll Get

• Real ownership of a live product.
• Opportunity to work with real users and production systems.
• Fully remote and flexible working environment.
• Exposure to modern backend architecture.
• Hands-on experience with large-scale document processing.
• Opportunity to work closely with a small, fast-moving product team.
• Stipend based on interview performance, skills, and experience.