Backend Engineer - Python/FastApi

Weekday AI (YC W21)

📍Pune Division, Maharashtra, India
Posted May 18, 2026

Job Overview

Position

Backend Engineer - Python/FastApi

Company

Weekday AI (YC W21)

Location

Pune Division, Maharashtra, India

Work Type

On-site

Job ID

li-4416204222

Job Description

This role is for one of the Weekday's clients
Min Experience: 0+ years

Location: Pune

JobType: full-time

We are looking for an exceptional backend developer who takes initiative rather than just waiting for tasks, eagerly experiments, learns quickly, and collaborates with us to shape the product. If you enjoy discovering new technologies, tackling challenging problems, and utilizing AI-assisted tools, this position is perfect for you.

Requirements
What You'll Do:

  • Develop, maintain, and scale backend services and APIs utilizing Python & FastAPI

  • Guarantee that APIs are secure, efficient, and thoroughly documented

  • Implement authentication and authorization mechanisms such as OAuth and JWT

  • Design and manage structured databases to ensure data integrity, optimal performance, and scalability

  • Work closely with frontend and product teams to achieve smooth integrations

  • Research and apply cloud technologies (AWS/GCP) as preferred

  • Engage in code reviews and promote best practices for writing clean, scalable, and maintainable code

  • Utilize AI-driven development tools like Windsurf, Claude, and GPT to enhance productivity

  • Take initiative in solving problems, experiment boldly, and improve processes independently without relying solely on assigned tasks

What We're Looking For:

  • Strong expertise in Python & FastAPI

  • Solid understanding of JavaScript and Python-based frameworks

  • Proficiency with Git and best practices in version control

  • Deep knowledge of structured databases, backend architecture, and data modeling

  • Extensive experience with secure API design and authentication/authorization methods

  • Ability to create clear, context-rich documentation for APIs and backend systems

  • Curious, self-driven, and proactive attitude — beyond merely completing assigned tasks

  • Passion for learning new technologies, experimenting, and refining workflows

  • Strong communication skills and team collaboration abilities

Nice-to-Haves:

  • Experience with ReactJS / NextJS

  • Familiarity with Linux and cloud platforms (AWS/GCP)

  • Knowledge of AI-assisted development tools

  • Experience with testing frameworks, caching strategies, database optimization, and microservices architecture

  • Familiarity with AI agentic frameworks such as CrewAI and LangChain

Why You'll Love Working Here:

  • Engage in a dynamic, fast-paced startup environment where your work makes a significant impact

  • Opportunity to experiment, learn continuously, and enhance your skills daily

  • Join a team that prioritizes initiative and autonomy over strict instructions

Must-have skills
Python

fastapi

Good-to-have Skills
crew

LangChain

Interview Prep

AI-powered insights to help you prepare

Key Skills

Required:
Preferred:

Practice Questions

💡Technical Questions (3)
  • 1.How do you utilize FastAPI to build a secure and efficient API endpoint, and what specific mechanisms do you implement for JWT authentication?
  • 2.When designing a structured database for a scalable backend application, how do you ensure data integrity and optimal performance?
  • 3.How do you integrate AI-assisted development tools like Windsurf, Claude, or GPT into your daily workflow to enhance productivity and code quality?
🎯Behavioral Questions (3)
  • 1.Tell me about a time you took the initiative to solve a problem or improve a process without waiting to be assigned a task.
  • 2.Describe a situation where you eagerly experimented with a new technology or methodology that was outside your comfort zone. What was the result?
  • 3.Give an example of how you collaborated closely with frontend or product teams to ensure a smooth integration between backend services and the user interface.
🧩Situational Questions (2)
  • 1.You discover that a recently deployed API endpoint is slowing down the application under heavy load, but you haven't been explicitly assigned to fix it. What do you do?
  • 2.You are tasked with building a new microservice that requires interacting with an LLM using a framework like LangChain or CrewAI, but you have limited experience with it. How do you approach this?

Resume Keywords

Make sure these keywords appear on your resume

PythonFastAPIJWTOAuthSQLAlchemyDatabase OptimizationAPI DocumentationAWSLangChainCrewAIAI-Assisted DevelopmentMicroservices

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