Senior Full Stack, Exp- 5-7 Years, Noida-58

Designation: Senior Full Stack Developer Experience: 5-7 Years Location: Noida- 58 (WFO) Role Summary We are seeking a Senior Full-Stack Developer to own the web application layer of a new B2B platform being delivered to a client. Client and project details are confidential and will be disclosed at onboarding under a confidentiality agreement. The role covers the full application layer: internal dashboards and workflow tools, a gated customer portal with secure document upload, user registration and authentication, subscription and credit-based billing, and integration with a third-party CMS via REST APIs. The developer works within a small senior delivery team - a Solution Architect who owns the technical design, and an AI Engineer whose LLM-backed APIs the application consumes - and demonstrates completed work in fortnightly sprint reviews with client stakeholders present. EolasFlow is an AI-native engineering team: AI-assisted development (Claude Code, Cursor, GitHub Copilot or equivalent) is the standard working method, and candidates are expected to already work this way. Key Responsibilities Build responsive web applications in TypeScript/React from agreed designs and API contractsImplement user registration, authentication and role-based access control (OAuth2/JWT, multi-tenant patterns)Build a gated customer portal including secure document upload and content approval workflowsIntegrate subscription and credit-based billing (Stripe or equivalent), including webhook handling and a transaction ledgerIntegrate third-party platforms via REST APIs, including a CMS/publishing systemOwn application infrastructure: Docker, CI/CD pipelines, environments, cloud deployment and monitoringConsume LLM-backed APIs, handling streaming, latency and failure states appropriately in the user experienceDeliver tested, documented, production-quality code; AI-generated code is subject to the same review standard as hand-written codePresent completed work in fortnightly sprint reviews Required Skills and RequirementMinimum 4 years of professional full-stack developmentStrong TypeScript and React (Next.js preferred)Node.js or Python backend development (Express/FastAPI or similar); sound REST API designOAuth2/JWT authentication, role-based access control and multi-tenant application patternsPayments integration with Stripe or equivalent: subscriptions, metered/credit billing, webhooksPostgreSQL, including schema design for transactional systemsDocker, CI/CD (GitHub Actions or similar) and one major cloud platform (AWS, Azure or GCP)Demonstrable experience integrating third-party REST APIs into production applicationsAt least one shipped production feature built on an LLM API (OpenAI, Anthropic or similar)Daily, fluent use of AI-assisted development tools (Claude Code, Cursor, GitHub Copilot or equivalent), with sound judgement on accepting, rewriting or rejecting AI-generated code; this will be assessed through a live practical exercise during selectionFluent written and spoken English; able to present work to non-technical stakeholders DesirableVector database exposure from the application side (pgvector, Qdrant, Pinecone)Marketplace or two-sided platform features: listings, matching, notificationsWordPress REST API or other publishing-platform integration experienceTransactional email at scale (SES, SendGrid) .