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Java, Spring Boot, Kafka, ClickHouse, Kubernetes

High-Load Development for German Companies

Backend architecture, event-driven systems, and real-time data pipelines engineered for companies in Germany.

H-Studio is a European engineering team working with companies across Germany — from Berlin and Munich to Hamburg, Frankfurt, and Cologne — to build scalable, fault-tolerant high-load systems.

We specialize in Java, Spring Boot, Kotlin, Kafka, ClickHouse, PostgreSQL, microservices, Kubernetes, and real-time distributed architectures designed for performance, resilience, and long-term maintainability.

If your company operates in Germany and faces challenges with scaling, slow APIs, fragile monoliths, overloaded systems, or delays in processing large volumes of data — we build architecture that handles any traffic load.

Why We Work Specifically with Germany

German companies often face common high-load system challenges:

  • •rapid load during peak transactions
  • •working with large data arrays
  • •slow monoliths on Java/Spring
  • •weak microservices architecture
  • •lack of real-time data
  • •high requirements for speed and security

We solve these challenges for clients in:

  • •fintech
  • •banks
  • •SaaS
  • •logistics
  • •marketplaces
  • •industrial systems
  • •IoT
  • •analytics

What We Build for German Companies

1. High-Load Backend Systems

Systems designed for:

  • •millions of users
  • •billions of events
  • •high concurrency
  • •enterprise-level SLA
  • •strict performance requirements

Tech stack: Java 17/20, Kotlin, Spring Boot, Redis, Kafka, PostgreSQL, gRPC, Micrometer

2. Real-Time Streaming Platforms

We build real-time data pipelines for:

  • •fintech transactions
  • •event-stream analytics
  • •user activity tracking
  • •data ingestion
  • •streaming notifications

Tech stack: Apache Kafka, Kafka Streams, Debezium, Flink, ClickHouse

3. Modernization of Legacy Java Systems

We optimize and rewrite:

  • •old Spring Boot monoliths
  • •heavy REST APIs
  • •databases at load limit
  • •outdated ETL processes

Result:

  • •p99 latency drops 2–5x
  • •performance increases 50–200%
  • •system scales more easily
  • •development accelerates

4. Event-Driven Architecture

We design systems with:

  • •asynchronous processing
  • •low latency
  • •horizontal scaling
  • •clear service isolation
  • •audit trail and fault tolerance

Паттерны: CQRS, Event Sourcing, Saga Orchestration, Outbox Pattern

5. Analytics Engines for High-Traffic Products

We build analytical engines capable of processing billions of rows:

  • •OLAP analysis
  • •clickstream processing
  • •real-time business metrics
  • •fraud-detection models

Tech stack: ClickHouse, PostgreSQL, dbt, Kafka, Grafana

6. Kubernetes Infrastructure for German Companies

We create:

  • •advanced k8s clusters
  • •zero-downtime deployment pipelines
  • •automatic scaling
  • •advanced observability
  • •HA clustering

Clouds: AWS, GCP, Azure, Hetzner, DigitalOcean

Why Our Team Is the Best Choice for Germany

  • ✓We work with companies across Germany
  • ✓7–12 years of high-load project experience
  • ✓Enterprise-level architects
  • ✓Deep expertise in real-time data
  • ✓Own experience building systems handling millions of events/sec
  • ✓Senior-only team
  • ✓Fast communication, excellent documentation

Results Achieved by Companies in Germany

  • •50–300% performance increase
  • •30–60% infrastructure cost reduction
  • •p99 latency < 50ms
  • •Zero-downtime releases
  • •More secure and stable architecture
  • •High resilience to peak loads

Frequently Asked Questions

How do you build high-load systems for the German market?

We use event-driven architecture, Kafka, Kubernetes, and Java/Spring Boot to make the system horizontally scalable.

Can you modernize an existing Java monolith?

Yes. We assess the current architecture and gradually migrate it to microservices without stopping the business.

Do you support real-time analytics for financial companies?

Yes, including ClickHouse and Kafka streams.

Can you work with German-based teams remotely?

Yes, we work with teams from Germany daily, covering different time zones.

Need High-Load Engineering for Your Platform in Germany?

Let's architect a system that scales — reliably, predictably, and without downtime.

Contact us