Robust Back-end Engineering & Secure APIs

Designing reliable server architectures, high-performance databases, and secure integrations.

The backend is the core and brain of any digital system. We engineer reliable server-side logic using Node.js and Python, designed to scale under heavy loads and process sensitive information securely.

Our specialists design optimized databases (PostgreSQL, MongoDB) implementing modern indexing and connection pooling. We leverage Redis caching and message queues to process background tasks efficiently, reducing response times.

Key Areas of Work

Server-side application development on Node.js (NestJS / Express) and Python (FastAPI / Django).
Design and optimization of SQL (PostgreSQL) and NoSQL (MongoDB) databases.
Multi-level caching implementation using Redis Cache Layer.
Secure REST & GraphQL APIs creation for mobile and web clients.
Integration of payment systems (Stripe, LiqPay) and business systems (CRM, ERP).

Technology Stack

Node.jsNestJSExpress.jsPythonFastAPIDjangoPostgreSQLMongoDBRedisREST / GraphQLWebSocketsStripe / LiqPay

const express = require('express');
const app = express();
const redis = require('redis');
const client = redis.createClient();
 
// Оптимізація запитів: Redis Cache Layer
app.get('/api/products', async (req, res) => {
  const cached = await client.get('all_products');
  if (cached) {
    return res.json(JSON.parse(cached));
  }
  const dbProducts = await db.query('SELECT * FROM products');
  await client.setEx('all_products', 3600, JSON.stringify(dbProducts));
  res.json(dbProducts);
});

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