# Senior Backend Developer (MERN Stack — AI-First) Source: https://realanalystjobs.com/job/senior-backend-developer-mern-stack-ai-first-fairdeal-market-577bf610 Senior Backend Developer (MERN Stack — AI-First) at FairDeal.Market, an on-site role based in Gurugram, India. Experience level: 5+ Years. Pay stated in the posting: INR 3,000,000 to 5,000,000. Posted on 15 July 2026, read from FairDeal.Market's own careers page (Keka), which RealAnalystJobs re-checks daily and removes the role when it closes. Updated 15 November 2026. ## Key facts - Company: [FairDeal.Market](https://realanalystjobs.com/companies/fairdeal-market) - Location: Gurugram, India - Work mode: On-site - Pay stated in the posting: INR 3,000,000 to 5,000,000 - Posted: Jul 15, 2026 - Employment type: Full time - Experience level: 5+ Years - Source: FairDeal.Market's careers page (Keka), re-checked daily Skills: AWS ## About this role Role: Senior Backend Developer (MERN Stack - AI-First) Experience: 5+ Years Location: Gurugram Role Summary As a Senior Backend Engineer, you will design and implement robust, scalable, high-performance backend services while working in an AI-first, agentic engineering culture. You will contribute to architectural decisions, solve complex technical problems, and mentor engineers across the stack, with a strong emphasis on Node.js, Express.js, MongoDB, and backend architecture. Beyond building services, you will design and ship AI-powered product features (LLM-backed APIs, retrieval pipelines, agentic workflows) and use AI coding agents hands-on to accelerate your own delivery. Familiarity with Docker and CI/CD pipelines is a plus. Key Responsibilities • Architect and implement backend services and REST APIs using Node.js and Express.js. • Design scalable data models and work with MongoDB and NoSQL databases efficiently. • Design and ship AI-powered product features - integrate LLM APIs, build retrieval-augmented (RAG) pipelines, and expose model-backed capabilities through clean, well-governed backend services. • Build and operate agentic workflows - tool-using agents, function/tool calling, orchestration, guardrails, evaluations, and human-in-the-loop checkpoints for production reliability. • Work AI-first, hands-on - use AI coding agents (e.g. Claude Code, Cursor, Copilot) daily to design, write, review, and refactor code, and help set the team's standards for effective, safe AI-assisted development. • Solve complex problems related to performance, scalability, and data integrity. • Ensure code quality through test coverage, peer reviews, and automated workflows - including evals and regression checks for AI/LLM features (accuracy, latency, cost, and safety). • Manage background jobs, queues, and event-driven architecture, including asynchronous and long-running AI/agent jobs. • Collaborate with frontend developers, product managers, and DevOps for feature implementation. • Lead the technical architecture of new features and services, including the AI/agent layer and its integration with core systems. • Ensure application security and data protection protocols, including responsible-AI practices - prompt-injection defense, PII handling, data residency (DPDP), and cost/rate controls on model usage. • Optimize applications for performance, scalability, and maintainability. • Mentor and guide junior engineers, ensuring best coding practices - and AI-assisted engineering practices - are followed. • Participate in sprint planning, technical discussions, and release management. Qualifications • Education: B.Tech in Computer Science, Information Technology, or related field. • 5+ years of hands-on experience with the MERN stack, especially in backend development. • Proficiency in JavaScript and Node.js, with deep understanding of Express.js. • Strong database knowledge, especially MongoDB, including schema design and optimization. • Hands-on experience building with LLMs - integrating model APIs (OpenAI, Anthropic, or similar), prompt design, structured outputs / tool calling, and shipping at least one AI feature to production or a serious prototype. • Practical, day-to-day use of AI coding agents (Claude Code, Cursor, Copilot, or equivalent) as part of your development workflow. • Experience architecting scalable backend systems. • Familiarity with Docker, containerization concepts, and CI/CD pipelines (e.g., GitHub Actions, Jenkins.) • Understanding of REST APIs, microservices, and API documentation (Swagger/OpenAPI). • Familiarity with Redis and message queues (RabbitMQ, Kafka) is a plus. • Strong problem-solving and analytical skills. • Excellent written and verbal communication. Good to Have • Experience with agent frameworks and orchestration (LangChain, LangGraph, LlamaIndex, or the Vercel AI SDK) and with the Model Context Protocol (MCP). • Vector databases and retrieval (pgvector, Pinecone, Weaviate, MongoDB Atlas Vector Search) and embedding-based search. • LLM evaluation and observability - eval harnesses, tracing, and monitoring model cost, latency, and quality in production. • Exposure to cloud platforms like AWS (EC2, S3, Lambda, Bedrock). • Experience with monitoring/logging tools (ELK Stack, Prometheus, Grafana). • Knowledge of GraphQL, WebSockets, or gRPC. • Fine-tuning, RAG optimization, or self-hosted / open-weight model experience. • Contribution to open-source or public code repositories. Description from FairDeal.Market's public careers feed, reproduced so you can read the role here. Apply on the company's own site; Real Analyst Jobs never submits anything for you. ## How to apply Open [this role on Real Analyst Jobs](https://realanalystjobs.com/job/senior-backend-developer-mern-stack-ai-first-fairdeal-market-577bf610) and use Apply now there to reach the employer's application. The listing is re-checked against FairDeal.Market's careers page daily and removed when it closes. ## FairDeal.Market 2 open analyst roles on Real Analyst Jobs. [More roles at FairDeal.Market](https://realanalystjobs.com/companies/fairdeal-market) ## More like this ### Other open roles at FairDeal.Market - [Program Manager - Category Analytics](https://realanalystjobs.com/job/program-manager-category-analytics-fairdeal-market-9724616e), Gurugram, India (On-site) - [Business Finance Manager](https://realanalystjobs.com/job/business-finance-manager-fairdeal-market-5af75982), Gurugram, India (On-site) - [Data analyst jobs in India](https://realanalystjobs.com/jobs/data-analyst-jobs-in-india) - [Analyst job market report](https://realanalystjobs.com/analyst-job-market) - [What analyst roles pay](https://realanalystjobs.com/blog/data-analyst-salaries) ## Sources and links - [This role on Real Analyst Jobs](https://realanalystjobs.com/job/senior-backend-developer-mern-stack-ai-first-fairdeal-market-577bf610) - [FairDeal.Market on Real Analyst Jobs](https://realanalystjobs.com/companies/fairdeal-market) - [All analyst jobs](https://realanalystjobs.com/jobs)