Freelance Remote Full Stack Web Developer Jobs in Key Biscayne, FL

Coderio designs and delivers scalable digital solutions for global companies. We combine strong technical expertise with a product mindset to lead complex software initiatives end-to-end. We work with international clients, value autonomy and clear communication, and build long-term partnerships through technical excellence.

More information: http://coderio.com

We are looking for a highly experienced Senior Full Stack Engineer to join a long-term engagement with one of our international clients. This role requires a seasoned professional with strong expertise across frontend, backend, and database development, capable of contributing to complex enterprise applications and collaborating effectively within global distributed teams.

The ideal candidate will bring extensive hands-on experience with modern JavaScript frameworks, backend technologies, and relational databases, while demonstrating excellent communication skills in English and the ability to work autonomously in a fast-paced environment.

This is a hands-on engineering role where you will contribute throughout the full software development lifecycle, from design and implementation to testing, deployment, and ongoing support.

Full Stack Development: Design, develop, maintain, and enhance enterprise-grade applications using ReactJS, Node.js, and Python technologies.

Frontend Engineering: Build responsive, scalable, and high-performing user interfaces leveraging ReactJS and modern frontend development practices.

Backend Development: Develop and maintain robust APIs, backend services, and business logic using Node.js and Python.

Database Development: Write, optimize, troubleshoot, and maintain complex SQL queries, stored procedures, and database objects using T-SQL.

System Integration: Collaborate on integrations between multiple internal and external systems, ensuring reliability, scalability, and performance.

Code Quality & Best Practices: Produce clean, maintainable, and well-documented code while adhering to engineering standards, code reviews, and testing practices.

Cross-Functional Collaboration: Partner with product managers, architects, QA engineers, and other stakeholders across global teams to deliver high-quality solutions.

Continuous Improvement: Participate in technical discussions, identify areas for optimization, and contribute to architectural and process improvements.

Experience Level: 10+ years of professional software engineering experience, with proven expertise in full stack application development.

Frontend Expertise: Strong hands-on experience with ReactJS, including modern JavaScript (ES6+), component-based architecture, and frontend best practices.

Backend Expertise: Solid development experience with Node.js and Python in production environments.

Database Skills: Advanced knowledge of T-SQL, including complex query optimization, stored procedures, functions, and performance tuning.

Software Engineering Fundamentals: Strong understanding of software design principles, object-oriented programming, data structures, and design patterns.

Collaboration & Ownership: Ability to work independently, take ownership of deliverables, and thrive in distributed teams.

Experience working with Sybase databases.

Experience modernizing or migrating legacy applications.

Exposure to cloud platforms such as AWS, Azure, or Google Cloud.

Experience with CI/CD pipelines and DevOps practices.

Knowledge of containerization technologies such as Docker and Kubernetes.

Experience working in Agile/Scrum environments.

Hybrid scheme working role working in a dynamic and fast-paced environment in the Miami / Fort Lauderdale area.

Long-term contract engagement with high impact and autonomy.

Strategic and high-visibility role within a modern engineering culture.

Opportunity to influence technical strategy, especially regarding modern event-driven architectures and AI integrations.