Development of web services with complex business logic

We start not with code but with understanding the task. We analyze business processes, map the user flow, and design the database structure and service architecture. We prepare an interactive Figma prototype that's approved before development begins. This saves you from costly changes at later stages.

For enterprise systems we use Angular — it provides a clear structure and convenient growth with a large number of modules. For client portals and SaaS — React, delivering fast rendering and flexibility. We implement real-time interfaces via WebSocket: status and notification updates without reloading the page. LCP in our projects is up to 1.5 seconds.

Node.js — for microservices, REST APIs and business logic: it handles from 10,000 requests per second on a single service. FastAPI (Python) — for AI services and processing large data volumes. Web service development on these technologies allows implementing authentication, access roles, task queues and background processes. We document the API via Swagger/OpenAPI.

The database type depends on the task. PostgreSQL and MySQL — for transactional systems with relational structures. MongoDB — for flexible data structures with frequent schema changes. Redis — for caching and speeding up system response several times over. File storage — S3-compatible solutions with a choice between cloud and on-premise.

We connect payment services (LiqPay, Stripe, Fondy), signing services (Diia.Signature, Vchasno), push notifications, email, SMS and messengers. Separately — the MCP protocol for connecting AI to corporate systems: when you need an AI agent to have access to your CRM or ERP data.

Docker containerization, CI/CD via GitHub Actions, SSL, uptime monitoring and backups. Cloud or On-Premise — at the client's choice. We set up dev, staging and production environments so new versions ship without risk to the live system. That's what full web service development looks like — from code to stable performance.

A web service is a software solution that runs through a browser and implements complex business logic: data management, request processing, integration with other systems. Simply put — the same app that opens in a browser, but doing the work of a full-fledged corporate system. Unlike an ordinary website, it has roles, authorization and real processes inside. That's why online services of this kind have become the standard for companies automating business processes.

If you're wondering how much it costs to build a web service — the answer depends on the number of modules, the complexity of the business logic and the scope of integrations. The decision to build a web service from scratch is usually justified when a business process doesn't fit any ready-made platform. We give a precise estimate after the Discovery stage, once the architecture and spec are fixed. That way you get a fixed cost with no hidden surcharges along the way.

Yes, this is one of our core competencies. We connect via REST API or WebSocket to any system with an open interface. If a system has no API — we analyze the possibility of integrating through other protocols or an intermediate layer.

It depends on the pace of the business's growth. We recommend reviewing the roadmap once a quarter and keeping dependencies and security patches up to date at all times. That's what SLA support is for — we monitor the system and respond before anything becomes a problem.

Both directly and indirectly. Directly — through automating sales, online payments and customer self-service without a manager. Indirectly — through reducing operating costs, errors and time spent on routine. Professional web service development pays off when the freed-up team resource is directed toward growth rather than manual processes.