Joana Kelly

Available to hire

Hi, I’m Joana Kelly, a dynamic full-stack developer with 5 years of experience building scalable web applications. I specialize in React, TypeScript, and REST APIs, delivering high-performance, reliable interfaces.

About

Hi, I’m Joana Kelly, a dynamic full-stack developer with 5 years of experience building scalable web applications. I specialize in React, TypeScript, and REST APIs, delivering high-performance, reliable interfaces.

As a backend engineer, I design and optimize REST APIs using Node.js and Spring Boot, secure systems with JWT and RBAC, and have reduced API latency by over 45% (600ms → 320ms). I’m focused on crafting scalable, high-reliability SaaS solutions with clean, robust architecture.

Languages

  • EnglishFluent

Industry experience

  • Software & Internet
  • Professional Services

More experts in Turku, Finland

Projects · 1

•Developed RESTful backend using Spring Boot and JPA
•Implemented JWT-based authentication and RBAC authorization
•Designed relational database schema with MySQL
•Containerized using Docker and Docker Compose

Spring Boot Backend API
  • Full Stack Developer

Work experience

Full Stack Engineer (Backend Focused) · Nordic IT SolutionsJan 2024 – Present · 2 yrs 11 mos

Designed and maintained scalable REST APIs using Node.js, serving 1,000+ active SaaS users in production. 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 SolutionJan 2021 – Jan 2023 · 2 yrs 1 mo

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. Built and maintained 5+ production web applications with backend-focused architecture.

Education

Bachelor of Science in Computer Science · University of Turku2017 – 2021

Testimonials · 5.0 from 1 review

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