H-Studio is an EU-based software and product engineering company headquartered in Tallinn, Estonia, specializing in scalable backend systems, real-time data platforms, and production-ready digital products. We work with founders and product teams across the United States, United Kingdom, and global markets, delivering senior engineering expertise for startups building MVPs, scale-ups scaling existing platforms, and enterprises requiring high-load systems. Our team of senior engineers focuses on long-term scalability, security-first architecture, and full code ownership — no templates, no vendor lock-in.
We build production systems for fintech companies, SaaS platforms, marketplaces, gaming platforms, and enterprise teams operating in regulated environments. Our clients range from early-stage startups launching their first production-ready version to growing companies scaling existing systems and enterprises requiring high-load infrastructure. We've built systems used by fintechs, marketplaces, and enterprise platforms processing millions of events per day. See our case studies for real examples.
We specialize in high-load backend systems, real-time data pipelines, event-driven architectures, scalable web platforms, cross-platform mobile applications, and internal tools. Our custom software developmentcovers complex workflows, business automation, and platform engineering. We also deliver web developmentand mobile app development for production-ready products.
The team includes senior software architects, backend developers specializing in high-load systems, frontend engineers with expertise in performance optimization, DevOps specialists building cloud infrastructure, and product leads with strong experience in fintech, enterprise platforms, and global SaaS products. All team members are senior-level engineers — we don't use junior developers on client projects.
We work in three main engagement models: end-to-end delivery where we take full responsibility for a system from architecture to deployment, co-development where we work alongside internal teams owning specific services or problem areas, and advisory engagements for architecture reviews and migration planning. All projects include clear documentation, predictable delivery cycles, and full code ownership. Learn more about our software development services.
Java 17/20, Kotlin, Spring Boot, Apache Kafka, PostgreSQL, ClickHouse, Redis, GraphQL, event-driven microservices patterns, and high-load data processing systems.
React, Next.js, Flutter, TypeScript, and performance-optimized web applications.
Docker, Kubernetes, Grafana, Prometheus, BigQuery, CI/CD pipelines, and cloud-native infrastructure.