Senior Full Stack Developer

Job Title: Senior Full Stack Developer
Location: San Jose, Costa Rica – Hybrid
Employment Type: Contract

Job Description:
Experienced Senior Software Engineers with strong front-end and back-end development expertise to design, develop, and maintain modern web applications and APIs supporting Ninja Online pre-sales solutions. The ideal candidate will be passionate about scalable software, modern UI frameworks, cloud-native development, and Agile delivery methodologies.

Key Responsibilities
• Develop and enhance responsive web applications using React, TypeScript, Node JS and modern JavaScript frameworks.
• Design and implement Single Page Applications (SPA) and Micro Frontend (MFE) architectures.
• Develop and maintain backend services and APIs using FastAPI, Python, and C#.
• Collaborate with Product Owners and Scrum teams to deliver user stories, epics, and backlog items.
• Participate in Agile ceremonies including Sprint Planning, Daily Standups, Reviews, and Retrospectives.
• Build scalable, secure, and maintainable software solutions.
• Contribute to CI/CD initiatives and DevOps best practices.
• Create technical documentation and support knowledge-sharing activities.
• Work closely with QA engineers to ensure product quality and reliability.
• Support ongoing innovation initiatives, including AI-enabled development practices where applicable.

Mandatory skills:
• JavaScript, React, TypeScript, Node.js
• HTML5, CSS3, Responsive UI Design
• FastAPI and API Development
• C#
• GitHub and Git-based workflows
• Docker
• ElasticSearch
• Postman
• Grommet UI Framework

Desired skills:
• AWS Cloud Services
• Backend Architecture and API Design
• System Integration and Performance Optimization

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