03/21/2026 updated
100 % available
Backend-Focused Full-Stack Engineer
Turku, Finland
Only remote
Bachelor of Science in Computer ScienceAbout me
Backend-focused Full-Stack Engineer with 5+ years of experience building scalable SaaS applications. Strong in Node.js, Spring Boot, and REST APIs, with proven SQL optimization and performance improvements (600ms → 320ms). Focused on clean architecture, reliability, and production-ready systems.
Java (Programming Language)Amazon Web ServicesAmazon Elastic Compute CloudAmazon S3AuthenticationsInfrastructure ManagementJava Persistence APIPostgreSQLMongoDBMySQLNode.jsPerformance TuningRole-Based Access ControlNext.jsSQL Databases
Backend
Node.js • Express • Spring Boot • Java • JPA • REST APIs • Authentication (JWT, RBAC) • SQL • MySQL • PostgreSQL • MongoDB
Dev & Infrastructure
Docker • Git • AWS (EC2, S3) • System Design • Performance Optimization
Frontend
React • Next.js • TypeScript • Vue
Experience
Professional experience0 - 5 years
Freelancer since2025
Languages
EnglishFluent
Project history
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.
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.