Joana Kelly

About

Dynamic Full-stack Developer with 5 years of experience building scalable web applications. Expert in React, TypeScript, and REST APIs, delivering high-performance, reliable interfaces. Backend engineer with proven expertise in designing and optimizing REST APIs using Node.js and Spring Boot, securing systems with JWT/RBAC, and reducing API latency by over 45% (600ms → 320ms). Focused on crafting scalable, high-reliability SaaS solutions with clean, robust architecture.

Experience

• Full-Stack Engineer (Backend Focused) · Nordic IT Solutions2024

  •Designed and maintained scalable REST APIs using Node.js, serving 1,000+ active SaaS users in production environments. •Improved API performance by optimizing complex SQL queries and implementing effective indexing strategies. •Implemented secure JWT-based authentication and RBAC authorization to strengthen application security. •Containerized backend services with Docker to ensure consistent development and deployment workflows. •Integrated third-party payment and analytics systems supporting core business operations. •Collaborated cross-functionally to improve API reliability, reduce production issues, and enhance long-term maintainability.

• Full Stack Developer · TechNova Solutions08-01-2021 – 12-01-2023

  •Built and maintained 5+ production web applications with backend-focused architecture. •Reduced API latency from ~600ms to ~320ms through SQL optimization. •Designed RESTful APIs with authentication, validation, and structured error handling •Refactored backend modules to improve scalability and maintainability •Containerized services for consistent staging and development workflows

Education

• University of TurkuBachelor of Science, Computer Science

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