APIs and integrations are responsible for how systems exchange data, synchronize states, run processes, and respond to events. In such tasks, not only requests and responses are important, but also contracts, security, stability, error handling and clear post-launch support.
We design APIs, microservices and integrations for new and existing products: from internal exchanges between modules to connecting CRM, ERP, payment systems, marketing services, analytics, mobile applications and external partner platforms.
What we work on
API design
A well-designed API should be clear for the teams that use it and stable enough for product growth. We define resources, scenarios, data formats, errors, authorization, versioning, access restrictions and compatibility rules between versions.
Special attention is paid to documentation, test environments and use cases so that APIs can be safely connected to web interfaces, mobile applications, partner systems or internal services.
Integration with external services
We connect payment systems, CRM, ERP, delivery services, analytics, marketing platforms, maps, messengers, authorization systems and other external tools. For every integration, it is important to account not only for the happy path, but also for delays, duplicates, cancellations, API limits and unexpected responses.
Once launched, the integration should be observable: with logs, statuses, retries, error messages, and the ability to quickly understand where exactly the problem occurred.
Data synchronization
When multiple systems work with the same data, the source of truth, update rules, priorities, conflicts, and synchronization frequency must be clearly defined. This is especially important for catalogs, orders, customers, payments, warehouses, statuses, and reporting.
We design exchanges in such a way that data is not lost, duplicated or accidentally overwritten. For critical processes, we provide an event log, reprocessing and integrity control.
Events, webhooks, and queues
Not all integrations need to work as an instant request and response. For complex or busy processes, we use events, webhooks, task queues, and background processing. This helps the system work stably even when the external service is temporarily unavailable or processing takes longer.
This approach is useful for payments, imports, mailings, document generation, file processing, synchronization of large volumes of data, and scenarios where guaranteed event delivery is important.
Microservices
Microservice architecture is not appropriate in every project. We consider it where there are separate domains, different workload requirements, independent development cycles, or the need to isolate critical parts of the system.
We evaluate not only the advantages, but also the cost of such an approach: infrastructure, monitoring, tracing, cross-service authorization, contracts, deployment and complexity of support.
Security and access
APIs often expose sensitive data and business-critical operations. Therefore, we consider authentication, authorization, roles, request restrictions, signatures, tokens, logging, data validation, and control of which operations are available to different types of users or systems.
Monitoring and support
An integration is complete not when it works once, but when it can be supported in real conditions. We configure logging, technical statuses, alerts, retries, manual event resending and error diagnostics.
This is especially important for processes where the error directly affects the customer or operational work: payments, orders, records, documents, status updates and directory synchronization.
Stages of development
Timeline and scope estimate
The estimate depends on the number of systems, the quality of their documentation, authorization type, data volume, process criticality, security requirements and error scenarios. If the integration involves payments, orders or important data, it is worth describing all states and edge cases first.
We usually plan the work in stages: system analysis, API contracts, test connection, error handling, monitoring, launch and stabilization after release.
