We design, build, and scale digital systems for companies that outgrow templates — from high-load backends and real-time data pipelines to analytics, automation, and DevOps.
From architecture and backend engineering to frontends, automations, and infrastructure — our team focuses on systems that stay fast and stable under real-world load.
We design and implement backends that can handle millions of events, spikes in traffic, and complex business logic — without downtime.
From internal dashboards to customer-facing apps, we build fast, reliable interfaces on top of solid backends.
We make your tools work as one: CRMs, marketing platforms, backends, billing, and internal systems — all in a single data flow.
Instead of "yet another dashboard," we create analytics that actually drive decisions — with stable data pipelines underneath.
We keep your systems fast, stable, and observable — from CI/CD pipelines to autoscaling and on-call monitoring.
We help teams make the right technical bets — from MVP scope and architecture to scaling a system that's already in production.
We work with teams that already feel the limits of their current stack — or know they will soon. Most of our work happens in products where stability, performance, and data integrity are critical.
High-load transaction processing, KYC / onboarding flows, secure customer portals, reporting and regulatory dashboards.
Multi-tenant architectures, role-based access, subscription management, real-time collaboration and integrations.
Matching engines, availability and pricing logic, messaging, notifications, analytics for both sides of the marketplace.
Live streams, feeds, notifications, content pipelines, caching layers for high-traffic experiences.
Whether you need a team to own a full system or senior engineers to unblock your roadmap, we adapt to your internal structure and processes.
We take full responsibility for a system: architecture, implementation, infrastructure, handover, and long-term maintenance options.
We work alongside your engineers — owning specific services, integrations, or "problem areas" in your architecture.
Short, focused engagements to review existing systems, identify risks, and design a migration or scaling plan.
You don't have to come with a full specification. Tell us what's slowing you down — we'll translate it into architecture, systems, and a concrete plan.
Our European engineering team works with clients across the EU:
H-Studio provides high-load backend development, real-time systems engineering, and cloud infrastructure services for companies across Europe. We design and implement backend architectures with Java, Kotlin, Spring Boot, Apache Kafka, PostgreSQL, and ClickHouse, as well as web and mobile applications on React, Next.js, Flutter, and React Native.
Our engineering team collaborates closely with EU-based fintech, SaaS, and data-driven companies, delivering high-load backend systems, real-time architectures, and mission-critical infrastructure. We work with companies across the EU — including Germany, Netherlands, Estonia, Finland, and Sweden — helping engineering teams build scalable systems, integrate CRMs and external APIs, automate internal workflows, and gain visibility through analytics and monitoring. We focus on clean engineering, predictable performance under load, and long-term maintainability — from first MVP to enterprise-scale deployments.
High-load backend architecture is at the core of what we build. When systems need to process millions of events per second, handle traffic spikes without downtime, or maintain sub-10ms latency under extreme concurrency, traditional architectures fail. We design event-driven systems using Apache Kafka for real-time data streaming, implement microservices with Spring Boot and Kotlin for horizontal scalability, and optimize databases like PostgreSQL and ClickHouse for both transactional and analytical workloads.
Real-time data processing requires specialized architecture patterns. We build systems that process streaming data with Kafka Streams, implement CQRS (Command Query Responsibility Segregation) for read-write separation, and use outbox patterns to ensure data consistency across distributed services. Our real-time platforms power live dashboards, instant notifications, collaborative features, and event-driven workflows that respond in milliseconds — not seconds.
Event-driven architecture (EDA) is fundamental to scalable systems. Instead of tightly coupled services that break under load, we design loosely coupled microservices that communicate through events. This approach allows systems to scale independently: if your analytics pipeline needs more capacity, we scale it separately from your payment processing. Kafka acts as the central nervous system, ensuring events are delivered reliably, even if individual services are temporarily unavailable.
For web and mobile applications, we build on top of solid backend foundations. Our frontend teams use Next.js and React for server-side rendering and optimal performance, Flutter and React Native for cross-platform mobile apps, and integrate real-time features through WebSockets and GraphQL subscriptions. Every interface connects to scalable backend APIs that can handle growth from thousands to millions of users.
Analytics and data platforms require stable pipelines and reliable storage. We implement event tracking architectures that capture every user interaction, build data warehouses with ClickHouse for fast analytical queries, and create dashboards with Looker Studio, Grafana, and custom BI tools. Our analytics systems integrate seamlessly with backend services, CRMs, and marketing platforms — providing a single source of truth for product, growth, and operations teams.
DevOps and cloud infrastructure ensure systems stay online and performant. We set up Kubernetes clusters for container orchestration, implement CI/CD pipelines with GitHub Actions and Jenkins, configure monitoring with Prometheus and Grafana, and automate scaling based on real-time metrics. Our infrastructure-as-code approach (Terraform, Helm) means environments are reproducible, version-controlled, and ready for production from day one. Whether you're deploying to AWS, GCP, or Hetzner, we build infrastructure that scales automatically and recovers from failures without manual intervention. high-load engineering services for EU companies, high-load backend development in Germany, and Apache Kafka engineers in Europe.