Fullstack Developer

Job Title: Full Stack Developer

Location: India / Sri Lanka

Employment Type: Full-Time

Experience: 4-6 years

About Tetherfi:

At Tetherfi, we create intelligent solutions that drives business and increase productivity. We combine industry expertise, technological capabilities and human-centered approach to help businesses evolve from thinking digital to being digital.

About the Role:

We are looking for a Senior Full Stack Engineer with proven experience in frontend (React / Angular), backend (Node.js / C#), and a deep understanding of unit testing, OOP, and software design principles.

The ideal candidate thrives in a collaborative environment, is detail-oriented, and has a passion for building secure, performant, and scalable web/backend applications.

Key Responsibilities:

• Design and develop responsive web applications using React and Angular with clean, semantic HTML and CSS.

• Build scalable backend services and APIs using Node.js and C#/.NET.

• Create and consume RESTful APIs for internal and external services.
• Write comprehensive unit tests using Jest, NUnit, or similar frameworks.
• Apply object-oriented programming (OOP) and design patterns to build maintainable and extensible software.
• Design and interact with relational and non-relational databases.
• Containerize applications using Docker and collaborate on deployment processes.
• Participate in Agile/Scrum meetings, collaborate with cross-functional teams, and contribute to continuous improvement practices.
• Conduct code reviews and mentor junior developers as needed.

Required Skills & Experience

• 4+ years of experience as a Full Stack Engineer or similar role.
• Proficiency in JavaScript/TypeScript, with solid experience in React and/or Angular.
• Experience with backend development in Node.js and/or C#/.NET.
• Strong understanding of HTML5, CSS3, and responsive design.
• Experience working with relational and non-relational databases.
• Proficiency in writing unit tests using Jest, NUnit, or equivalent.
• Strong grasp of REST API development, OOP principles, and design patterns.
• Experience with Git, CI/CD, and working in Agile environments.
• Knowledge of performance optimization and security best practices.

Nice to Have

• Familiarity with Docker, Kubernetes, or other container orchestration platforms.
• Exposure to AWS Services.