Senior Python Developer

Senior Python Developer (Remote- Contract)

Company: (Blurn Group)

Location: 100% Remote (Work from Home)

Minimum Experience - 10+ years of hands-on experience in Python backend development

Start Time: 6:30 AM IST (to align with Australian hours)

Start Date: Immediate (Preffered)

Job Type: Freelance; 612 Months (Extendable based on performance and project scope)

Language Requirement: English (Preferred additional language: Tamil)

Salary: Based on Relevant Experience

Working Days - Mon-Fri/Sat

Annual Paid Leave: 25 Days + National Holidays

Company's India HQ: Coimbatore, Tamil Nadu

Company's Global HQ: Sydney, Australia

Company's Main Client Base: USA, UK & Australia

Key Contacts: CEO, Head of Web Development

We're Blurn/Bismath, a global digital marketing and web development agency with clients in Australia, the UK, and the USA. We are looking for an experienced Python Developer to join our extended team on a 6-12 month initial contract, with the potential for extension upon successful performance. This is a long-term, stable opportunity for developers who enjoy working independently while contributing to a collaborative international team.

About the Project

We are building an AI-driven analytics and marketing information serving platform that integrates with Google Analytics, Google Search Console, SEMrush, Google Ads, Microsoft Advertising, Meta Ads, and other marketing data sources. The platform will fetch data via APIs, process and manipulate it using the ChatGPT API, and present information to users through a React-based dashboard and a custom AI chatbot.

Key Responsibilities

• Architect and develop a scalable Python backend for API integrations, AI workflows, and chatbot functionality.
• Implement LangChain and LangGraph for AI orchestration and multi-agent workflows.
• Integrate with n8n (or similar) for workflow automation.
• Build and secure RESTful APIs connecting backend services, frontend, and external platforms.
• Design, optimise, and manage PostgreSQL (advanced queries, indexing, partitioning) and MongoDB databases.
• Develop data pipelines and normalisation workflows for multiple marketing and analytics APIs.
• Implement containerisation strategies using Docker for consistent deployments.
• Deploy and manage applications across AWS, GCP, and Azure.
• Ensure application security, performance optimisation, and scalability.
• Collaborate with frontend developers to ensure smooth integration.
• Stay updated with LLM advancements, RAG, and AI workflow orchestration.

Tech Stack

Core Platform for the Whole Project:

• WordPress (PHP) – Authentication layer
• React – User dashboard (frontend)
• Python – Backend AI processing & orchestration
• PostgreSQL & MongoDB – Structured & unstructured data storage
• n8n – Workflow automation
• ChatGPT API – AI analytics & insight generation

Languages & Frameworks:

• Python 3.11+
• FastAPI (preferred) / Flask (for legacy services)
• Pydantic v2
• Celery or Dramatiq (async tasks)
• httpx or aiohttp (async API calls)

Databases & Storage:

• PostgreSQL (indexing, materialised views, JSONB, partitioning)
• MongoDB for unstructured data
• Redis (caching, rate limits, queues)
• S3 or object storage

Security:

• cryptography, pyjwt, passlib
• OAuth2 / JWT / token rotation
• Secrets management (HashiCorp Vault / AWS Secrets Manager)
• HTTPS / SSL certificate handling

DevOps & Deployment:

• Docker, Docker Compose
• GitHub Actions / GitLab CI
• AWS, GCP, Azure
• Load balancing, failover, auto-scaling

Data & AI Integration:

• pandas, polars, Dask
• ChatGPT API with function calling
• Prompt engineering & caching
• Data normalisation from APIs

Testing & QA:

• pytest, pytest-asyncio
• httpx, TestClient (FastAPI)
• Contract testing for APIs

Requirements

• 10+ years of hands-on Python backend development.
• Proven expertise in LLM Powered Apps, using LangChain, LangGraph, etc.
• Strong understanding of RAG and multi-agent AI systems.
• Experience with n8n or similar automation tools.
• Advanced PostgreSQL and MongoDB skills.
• Strong REST API development and integration experience (OAuth2, JWT).
• Proficiency in containerisation (Docker); Kubernetes a plus.
• Good working knowledge of React to collaborate with frontend teams.
• Experience integrating external marketing and analytics APIs.
• Cloud deployment experience (AWS, GCP, Azure).
• Strong understanding of application security best practices.

Preferred Skills

• AI-powered SaaS product experience.
• ChatGPT API & prompt engineering.
• Familiarity with GDPR, CCPA compliance.
• Marketing analytics or ad tech platform experience.