Ruman User

I’m a Senior Full-Stack Engineer with 8+ years of experience architecting high-traffic, real-time applications for enterprise clients, with a strong focus on system reliability, performance optimization, and AI/ML integration. I lead technical teams to deliver MVPs for global clients while ensuring scalability, security, and cross-platform compatibility, bringing structure through Agile/SAFe methodologies and CI/CD pipelines.

In recent consulting work at Tieto Oyj, I led architecture and rebuilds for key mobile modules, improving app stability and performance and reducing crash rates during peak usage; I also developed real-time features like personalized schedules, live push notifications, and geolocation-based services. I’ve built and maintained state/data synchronization for thousands of concurrent users, managed full app lifecycles through CI/CD to iOS and Android stores, and architected a scalable B2B mobile platform with secure authentication, invoice generation, and service structure synchronization. Earlier roles strengthened my foundation in frontend architecture and developer experience—modernizing Raflaamo.fi with GatsbyJS/Next.js/GraphQL for SEO, accessibility, and faster load times using W3C standards—plus mentoring junior developers and standardizing style guides and automated workflows. I bring a practical engineering ethos: ship measurable improvements, keep code quality high through reviews and testing, and design for long-term maintainability.