API Development & System Integrations
REST, GraphQL, SOAP, Kafka, gRPC — high-performance integrations for fast, scalable products.
We build reliable APIs and deep system integrations for companies — connecting internal tools, platforms, CRMs, ERPs, and external services into one predictable, scalable ecosystem. From REST and GraphQL to event-streaming with Kafka and high-speed gRPC, our engineering team delivers secure, modern, and high-performance interfaces ready for enterprise load and long-term stability. Whether you need to integrate multiple systems, modernize legacy APIs, or build a new API layer for your product — we create solutions engineered for speed, security, and interoperability.
Why Companies Choose Us
What We Deliver
Custom API Development
- •REST APIs with OpenAPI/Swagger
- •GraphQL schemas and resolvers
- •High-performance gRPC interfaces
- •API gateways with throttling, rate limiting, quotas
- •Versioning, monitoring, observability, lifecycle management
- •Secure authentication flows (OAuth2/SSO/MFA)
Enterprise System Integrations
- •ERP, CRM, HRM, accounting system integration
- •Payment providers (Stripe-like, banking APIs, PSPs)
- •Logistics platforms, inventory systems, booking engines
- •Identity management (Keycloak, CAS, OpenID, SAML)
- •Marketplace integrations (Google, Meta, Ozon, etc.)
- •Webhooks, callback systems, event pipelines
Event Streaming & Messaging Systems
- •Kafka pipelines for real-time or batch events
- •Async workers & microservice communication
- •High-frequency transactional flows
- •Outbox patterns and message deduplication
- •Distributed workflows and reliable retries
- •Real-time notifications and event broadcasting
Legacy API Modernization
- •Transforming SOAP/XML to modern REST
- •Replacing outdated interfaces without downtime
- •Step-by-step migration paths with backward compatibility
- •Data normalization & transformation pipelines
- •Wrapping legacy services with modern API gateways
- •Reducing technical debt while keeping continuity
Security & Access Control
- •OAuth2, JWT, SSO, MFA
- •Keycloak realm design + secure integration
- •RBAC permissions and privilege separation
- •API key & signature-based authentication
- •HMAC, request signing, timestamp validation
- •GDPR-compliant audit trails & activity logs
Performance & Reliability
- •Redis caching layers
- •Horizontal API scaling (clusters, auto-scaling)
- •Stress tests, load tests, profiling
- •Latency optimization and connection pooling
- •Circuit breakers, retry strategies, fallbacks
- •Prometheus + Grafana monitoring dashboards
When You Need API Development & Integrations
Choose this service when you want to:
Tools & Technologies
Protocols & API Layers
REST, GraphQL, SOAP, gRPC, WebSocket
Messaging & Streaming
Kafka, RabbitMQ, SSE
Security
OAuth2, JWT, Keycloak, CAS, SSO, MFA
Databases
PostgreSQL, ClickHouse, Redis, Oracle
Languages & Frameworks
Java 21, Spring Boot, Spring Cloud, Node.js (optional)
Monitoring
ELK Stack, Prometheus, Grafana
Infrastructure
Docker, Kubernetes, Nginx, API Gateways
Example Work (Case Studies)
FAQ
What types of APIs do you build?
REST, GraphQL, SOAP wrappers, gRPC services, and event-driven messaging.
Can you integrate with our existing systems?
Yes — CRMs, ERPs, banking services, logistics, identity providers, marketplaces, etc.
Do you support high-load environments?
Yes — we design and optimize distributed, scalable systems.
Can you migrate from legacy SOAP or outdated systems?
Absolutely — including wrapping, gradual migration, and backwards compatibility.
Do you handle authentication?
Yes — OAuth2, JWT, SSO, Keycloak, MFA, RBAC.
Related Services
We work with companies in Berlin and across Germany, delivering API development and system integrations, REST and GraphQL APIs, Kafka streaming, and SOAP migration consulting. Our Berlin-based team specializes in API gateway development, enterprise API architecture, OAuth2 integration, and secure system integrations for scalable digital products.