Full Stack Engineer

Celerity Consulting; Delhi; On-site; INR 1,200,000 - 2,600,000; Full time

Job summary

Celerity Consulting in Delhi, India, seeks a skilled Backend Engineer to design, develop, and maintain scalable Python backends. You will build REST APIs, integrate AI models, and implement agentic AI workflows in real-world applications.

Bring hands-on experience with FastAPI, Flask, or Django, plus LLMs, RAG, and AI orchestration. You will collaborate with product and engineering teams to ship robust, tested code.

Qualifications

• Proficiency in Python backend development.
• Experience building RESTful APIs and database design.
• Hands-on with LLMs, RAG, and AI workflows.
• Knowledge of LangChain or LangGraph.

Responsibilities

• Design, develop, and maintain scalable Python backends.
• Build REST APIs and integrate third-party services and AI models.
• Develop agentic AI solutions, including AI agents and tool calls.
• Work with LLMs, prompt engineering, RAG, and orchestration frameworks.
• Design backend architectures for AI-powered automation.
• Work with databases and backend performance optimization.
• Collaborate with product and engineering teams to deploy AI features.
• Write clean, maintainable, well-tested code.
• Troubleshoot and maintain production applications.

Skills

Python

Backend development

REST APIs

LLMs

RAG

Agentic AI

LangChain

LangGraph

Frontend basics

Tools

FastAPI

Flask

Django

Job description

Responsibilities:

• Design, develop, and maintain scalable backend applications using Python.
• Build REST APIs and integrate third-party services, AI models, and internal systems.
• Develop and deploy agentic AI solutions, including AI agents, tool calling, and multi-step workflows.
• Work with LLMs, prompt engineering, RAG, and AI orchestration frameworks.
• Design backend architectures for AI-powered automation and intelligent decision-making.
• Work with databases, data processing, and backend performance optimization.
• Collaborate with product and engineering teams to build and deploy AI-driven features.
• Write clean, maintainable, and well-tested code.
• Troubleshoot, optimize, and maintain production applications.

Requirements:

• Strong proficiency in Python and backend development.
• Experience with FastAPI, Flask, or Django.
• Strong knowledge of REST APIs, databases, and system design.
• Hands-on experience with LLMs, RAG, and agentic AI development.
• Familiarity with AI agents, tool calling, and frameworks like LangChain or LangGraph.
• Basic knowledge of frontend technologies (React.js, JavaScript, or TypeScript).
• Strong problem-solving and debugging skills.