Freelance Full Stack Developer Node Js Jobs in Syosset, NY

Job Description:

Job Description   Position Summary

We are seeking a highly motivated Full Stack Developer to design, develop, and maintain scalable, high-quality software solutions across the entire technology stack. The ideal candidate will have strong hands-on experience in modern frontend frameworks (React), backend development (Node.js, Java, Python, or .NET), SQL/NoSQL databases, and REST API development, along with a solid understanding of authentication mechanisms, microservices architecture, and responsive UI/UX design.

The candidate should be comfortable working in a collaborative engineering environment and applying sound software development practices, including Test Driven Development (TDD) and Behavior Driven Development (BDD) for both frontend and backend components.

Core Responsibilities

Frontend Development

•     Design and develop responsive, user-friendly web applications using React

•     Build reusable UI components and implement modern design patterns

•     Integrate frontend applications with backend REST APIs

•     Implement client-side authentication and authorization flows

•     Ensure cross-browser compatibility and responsive design across devices

•     Optimize frontend performance and user experience

•     Collaborate with UX/UI designers to implement pixel-perfect designs

Backend Development

•     Design, develop, test, and support enterprise-grade backend services and APIs

•     Build and maintain RESTful APIs for internal and external system integrations

•     Develop backend services using Node.js, Java (Spring Boot), Python (FastAPI), or .NET

•     Work with SQL Server, PostgreSQL, MongoDB, or Oracle to design queries, optimize performance, and manage data interactions

•     Implement secure application components with knowledge of authentication and authorization principles (OAuth2, JWT, API keys)

Full Stack Responsibilities

•     Contribute to microservices-based application design and development

•     Write clean, maintainable, and well-tested code following engineering best practices

•     Participate in code reviews, technical discussions, and design sessions

•     Troubleshoot production issues across the full stack and support ongoing application stability

•     Collaborate with cross-functional teams including product owners, architects, UX/UI designers, QA, and DevOps

•     Participate in agile ceremonies and contribute to sprint planning and estimation

Required Skills and Qualifications

Frontend Skills (Primary Focus)

•     Strong experience with modern JavaScript/TypeScript

•     Hands-on experience with React.js (or Angular, Vue.js)

•     Proficiency in HTML5, CSS3, and responsive design principles

•     Experience with state management (Redux, Context API, NgRx, Vuex, Pinia)

•     Knowledge of frontend testing frameworks (Jest, React Testing Library, Jasmine, Karma, Vitest)

•     Understanding of component-based architecture and design patterns

•     Experience with RESTful API integration and asynchronous data handling

Backend Skills

•     Working knowledge of at least one backend technology: Node.js, Java (Spring Boot), Python, or .NET

•     Ability to design, create, and consume REST APIs

•     Strong working knowledge of relational databases (SQL Server, PostgreSQL, Oracle)

•     Understanding of NoSQL databases (MongoDB, DynamoDB) is a plus

•     Good understanding of authentication concepts and implementation (OAuth2, JWT, API keys)

•     Familiarity with Test Driven Development (TDD) and backend testing frameworks

General Skills

•     Good understanding of microservices architecture and distributed systems

•     Strong problem-solving and debugging skills across the full stack

•     Ability to work effectively in a team-oriented, agile development environment

•     Good verbal and written communication skills

•     Experience with version control (Git, GitLab, GitHub)

•     Understanding of CI/CD concepts and modern deployment practices

Nice-to-Have Skills

Frontend

•     Experience with UI component libraries (Material-UI, Ant Design, PrimeNG, shadcn/ui, Chakra UI)

•     Knowledge of CSS frameworks (TailwindCSS, Bootstrap, SCSS/SASS)

•     Experience with build tools and bundlers (Webpack, Vite, esbuild, Rollup)

•     Familiarity with GraphQL and Apollo Client

•     Experience with Server-Side Rendering (SSR) or Static Site Generation (SSG) (Next.js, Nuxt.js)

•     Knowledge of data visualization libraries (D3.js, Chart.js, Recharts, Plotly, AG-Grid)

•     Experience with Progressive Web Apps (PWA)

•     Familiarity with accessibility standards (WCAG) and internationalization (i18n)

Backend

•     Experience with caching technologies (Redis, Hazelcast)

•     Knowledge of message queues (Kafka)

•     Experience with event-driven architectures and real-time data processing

•     Understanding of API gateway patterns and service mesh concepts

•     Experience with ORM frameworks

DevOps & Infrastructure

•     Exposure to containerization (Docker) and orchestration (Kubernetes)

•     Experience with cloud platforms (AWS, Azure, GCP)

•     Understanding of performance tuning and scalability considerations

Preferred Experience

•     Experience developing and supporting enterprise applications with complex UI requirements

•     Experience working in an Agile/Scrum environment

•     Exposure to secure API development and service-to-service communication patterns

•     Experience with unit testing, integration testing, and E2E testing (Jest, Cypress, Playwright, Selenium)

•     Familiarity with package managers (npm, yarn, pnpm, Maven, Gradle, NuGet)

•     Experience with TypeScript for type-safe development

•     Knowledge of code quality tools

•     Experience with WebSocket and Server-Sent Events (SSE) for real-time applications

•     Understanding of responsive design and mobile-first development

•     Experience with micro-frontends architecture

Technical Competencies

Frontend (Primary): JavaScript/TypeScript, React.js, HTML5, CSS3

Frontend Frameworks: React

UI/Styling: Tailwind, CSS, Material-UI, Bootstrap, SCSS/SASS

Backend: Node.js, Java (Spring Boot), Python (FastAPI), .NET Core

Database: SQL Server, PostgreSQL, MongoDB, Oracle

Architecture: Microservices, REST APIs, Event-Driven Architecture, Component-Based UI

Security: OAuth2, JWT, CORS, CSP, Authentication/Authorization

Testing: Jest, React Testing Library, Cypress, Playwright, JUnit, pytest

Build & Deploy: Docker, GitLab CI/CD, Jenkins, Webpack, Vite, npm/yarn

Nice to Have: Redis, Kafka, GraphQL, WebSocket, SSE, Kubernetes, AWS/Azure

Candidate Profile

The ideal candidate is

•     A strong full stack engineer with primary focus on React.js and modern frontend development

•     Comfortable working with multiple backend technologies and adapting to project needs

•     Familiar with modern software engineering practices and quality standards across the full stack

•     Experienced in component-based UI architecture and modern frontend tooling

•     Able to bridge the gap between backend and frontend teams effectively

•     Proficient in building responsive, intuitive user interfaces with attention to detail

•     Comfortable with RESTful API design and integration

•     Eager to learn new technologies and contribute in a fast-paced technical environment

•     Passionate about clean code, testing, user experience, and continuous improvement

•     User-focused with strong understanding of UX principles and best practices