Full Stack Developer (Python-Heavy / Backend-Focused)

Hello,My name is Sreeja and I represent TestingXperts Inc. TestingXperts is a Specialist QA & Software Testing Company, and an Independent Software Testing division of Damco Group, which is a leading IT Solutions and Services company working with Fortune Enterprises globally. Inheriting the virtues of job quality and optimal user satisfaction from Damco Group, TestingXperts aims at promoting the ethics of connected innovation, thereby seeding the integral values in our employees and achieving unmatched contentment in our clients. To know more about Testingxperts Inc., please visit our website www.testingxperts.com.If you are interested in the opportunity listed below, please forward your updated resume along with current contact information, or perhaps you can recommend someone who would be interested in this positionPosition TitleFull Stack Developer (Python-Heavy / Backend-Focused) (2 Positions)LocationMiami, FL 33131(Day One Onsite) / New JerseyEmployment TypeFulltime Job DescriptionRole OverviewWe are seeking a highly skilled Full Stack Developer with deep, hands-on Python backend engineering experience as the core of the role, complemented by working proficiency in ReactJS for frontend development. This is a backend-first full-stack position - candidates must demonstrate strong depth in Python services, database design, and authentication/authorization frameworks, along with a solid understanding of AI, Agentic AI systems, and the Model Context Protocol (MCP).Key ResponsibilitiesDesign and develop scalable, production-grade backend services using Python frameworks (FastAPI / Flask / Django)Architect, build, and integrate RESTful APIs and backend microservices with strong attention to performance, reliability, and securityDesign and optimize relational database structures using PostgreSQL / MySQL / SQL Server - including schema design, indexing strategies, query optimization, and data modelingImplement robust authentication and authorization frameworks beyond basic JWT - including OAuth 2.0 / OpenID Connect, SSO integrations, session management, token lifecycle (refresh/rotation/revocation), and role-based / attribute-based access control (RBAC/ABAC)Develop responsive frontend applications using ReactJS (Hooks, state management) to support backend-driven featuresIntegrate AI and LLM-powered capabilities into backend services, including agentic workflows and tool-calling patternsApply MCP (Model Context Protocol) concepts to connect AI agents with backend services, APIs, and data sourcesCollaborate with cross-functional teams on API contracts, data flows, and end-to-end feature deliveryMust-Have SkillsPython Backend (Primary): Strong, hands-on experience building backend services with FastAPI / Flask / Django - async patterns, dependency injection, middleware, API versioning, testing, and production deploymentDatabases: Deep practical experience with PostgreSQL / MySQL / SQL Server - complex queries, joins, indexing, transactions, ORM usage (SQLAlchemy / Django ORM), and performance tuningAuthentication & Security: Demonstrated depth in auth frameworks beyond JWT basics - OAuth 2.0, OIDC, SSO, RBAC, secure session handling, and API security best practicesRESTful APIs: Proven experience designing, building, and integrating REST APIs and backend services at scaleAI / Agentic AI / MCP: Solid understanding of LLM fundamentals, agentic AI architectures (planning, tool use, multi-step workflows), and the Model Context Protocol (MCP) for agent system integration; familiarity with frameworks such as LangChain / LangGraph is a strong plusReactJS (Secondary): Hands-on expertise with ReactJS - Hooks, component lifecycle, and state management (Redux / Context API)Candidate Profile ExpectationsBackend-dominant full-stack engineer: roughly 80 90% Python/backend and 10 20% React in day-to-day work, must have AI experience.Must be able to demonstrate, in technical conversation, real depth in Python, database design, and authentication frameworks - not just frontend fluencyFrontend-heavy profiles (e.g., 80/20 frontend/backend) will not be a fit for this role