APIs and Integrations

Designing and building REST/GraphQL APIs, integrating with external services, building microservices architecture and connecting payment gateways.

Problem and solution

Problem

Your business runs dozens of disconnected tools: CRM, accounting, inventory, payments, analytics — data gets lost, staff spend time moving it by hand, and managers never see the full picture.

Solution

We design and build APIs and integrations that turn your scattered tools into one ecosystem — automatic data synchronisation, a single source of truth, and hours of daily work saved.

Who it's for

Startups

Connect your tools from day one and build clean APIs that are easy to scale on later.

Growing businesses

Eliminate manual entry and duplicate data with automatic synchronisation between your systems.

Enterprise

Scalable microservices architecture with high security and reliability under load.

A fixed estimate and quote — after a free audit. We start by discussing your task.

What you get

Documented, production-ready APIs
Integrations with your systems and external services
OpenAPI documentation, monitoring and logging
Team training and post-launch support

Connecting systems into one working mechanism

Businesses run dozens of tools: CRM, accounting, inventory, payment systems, analytics. When these systems aren't connected, data gets lost, staff spend time moving information by hand, and leaders can't see the full picture. We design and build APIs and integrations that turn scattered tools into a single ecosystem.

What we do

API design and development

Robust APIs that become the backbone of your digital infrastructure:

  • REST APIs: standardised interfaces with clear documentation and versioning.
  • GraphQL APIs: flexible data queries for complex frontend applications.
  • gRPC services: high-performance service-to-service communication.
  • WebSocket APIs: real-time data exchange for chat, notifications and live updates.
  • Webhook systems: automatic event notifications for external systems.

Integration with external services

Connecting to any platform or provider:

  • Payment systems: Stripe, PayPal and other providers.
  • CRM systems: Salesforce, HubSpot and others.
  • Accounting: integration with accounting and inventory platforms.
  • Marketing platforms: Google Ads, Facebook Ads and email services.
  • Messaging: Telegram Bot API, WhatsApp Business API and more.

Microservices architecture

Modular architecture for complex systems:

  • Monolith decomposition: a step-by-step transition from monolith to microservices.
  • Event-driven architecture: asynchronous communication through message brokers.
  • Service mesh: traffic management, load balancing and fault tolerance.
  • API gateway: a single entry point with authentication, rate limiting and monitoring.

Documentation and monitoring

Transparency and control at every stage:

  • OpenAPI/Swagger documentation: interactive documentation for developers.
  • Availability monitoring: real-time tracking of uptime, latency and errors.
  • Logging and tracing: full visibility into the call chain between services.
  • Alerting: instant notifications when things deviate from normal.

Key benefits

Automated data flows Automatic data synchronisation between systems eliminates manual entry and the errors that come with it. Clients cut time on routine operations by 60–80%.

A single source of truth When all systems are connected, data is consistent everywhere. Leaders get reliable analytics and managers get up-to-date information without reconciling data across systems.

Security and standards compliance OAuth 2.0, JWT, encryption in transit and at rest, and access auditing. All integrations meet GDPR and industry security standards.

Versioning and backwards compatibility Proper API versioning ensures updates don't break working integrations. Smooth migration between versions with no downtime.

Scalability and fault tolerance Architecture able to handle thousands of requests per second with automatic scaling. Circuit-breaker patterns and retry mechanisms keep things stable even when external services fail.

Integration speed A well-designed API cuts the time to connect new partners and services from months to days. Developer experience is our priority.

Technologies we use

  • API frameworks: FastAPI, Express, NestJS, Gin (Go).
  • Protocols and standards: REST, GraphQL, gRPC, WebSocket, OpenAPI 3.0.
  • Message brokers: RabbitMQ, Apache Kafka, Redis Streams, NATS.
  • Databases: PostgreSQL, MongoDB, Redis, ClickHouse.
  • Infrastructure: Docker, Kubernetes, Nginx, Traefik, Kong API Gateway.
  • Monitoring: Grafana, Prometheus, Jaeger, Sentry, ELK Stack.

How we work

  1. Audit and design: analyse the current infrastructure and data flows, identify integration points and dependencies, design the API architecture and choose protocols, and create the specification and interaction contracts.
  2. Development and documentation: build the API with automatic documentation generation, implement authentication, authorisation and rate limiting, write integration and contract tests, and create SDKs and usage examples for API consumers.
  3. Testing and security: load testing to verify performance, a security audit and penetration testing, fault-tolerance and recovery-scenario testing, and validation against the specification and contracts.
  4. Deployment and monitoring: phased deployment with canary releases, monitoring, alerting and logging setup, team training on the API and documentation, and ongoing support, updates and optimisation.

Use cases

  • E-commerce and retail: integrating an online store with inventory and delivery services, connecting payment systems and recurring payments, and synchronising catalogues between marketplaces and your own store.
  • Fintech and banking: connecting to banking APIs for account aggregation, Open Banking integrations to PSD2 standards, and anti-fraud systems with real-time transaction checks.
  • SaaS platforms: public APIs for third-party developers with a developer portal, webhooks to notify partners of events, and microservices architecture for independent scaling of modules.
  • Corporate: integrating CRM with accounting and document-flow systems, HR-process automation from request to onboarding, and unified leadership dashboards with data from every system.

Ready to bring order to your IT infrastructure and connect all your systems? Book a free audit of your current integrations. We'll uncover the bottlenecks, eliminate duplicate data and propose an architecture that saves your team hours of daily work.

Frequently asked questions

How much does API and integration development cost?
We fix the cost after a free audit of your infrastructure — it depends on the number of systems, the integration complexity and the protocols involved. We start with a no-obligation conversation about your task.
How long does the work take?
Integrating a single service starts from 2–4 weeks; a microservices architecture or multi-system integration from 8–12 weeks, depending on the scope agreed.
What do I get in the end?
Documented, production-ready APIs, working integrations with your systems, documentation, monitoring, team training and post-launch support.
Is this right for my business?
If your systems are disconnected, or you suffer from duplicate data and manual entry, then yes. In the free audit we uncover the bottlenecks and propose an architecture that saves hours of work.

Interested in APIs and Integrations?

Let's discuss your project and choose the optimal solution for your business.