OUR SERVICES
We build production-ready Node.js backends that handle real-world load. From RESTful APIs and microservices to real-time WebSocket servers, Kultrix delivers Node.js infrastructure that is fast, secure, and maintainable.
Tell us what you are building - what exists today, what it has to do and when it has to be live. We come back with the questions we need answered and a scoped estimate instead of a range.
EXPERTISE
OUR APPROACH
Choose the cooperation format that best fits your business goals and development velocity.
Fast launch to test your idea and gather user feedback with minimal investment.
What's included
Timeline Typically 9-16 weeks
Complete cycle from initial strategy and design to final launch.
What's included
Timeline Typically 20-40 weeks
Scale your team with expert developers to accelerate development.
What's included
Timeline Flexible / Long-term
OUR PROCESS
We specialize in creating user-centered & innovative solutions. Delivering seamless digital experiences.
EXPERT INSIGHTS
Node.js delivers non-blocking I/O and a unified JavaScript stack that lets frontend and backend teams move at the same speed.
Non-blocking I/O
Handles thousands of concurrent connections without thread overhead.
Unified language
Share types, utilities, and validation logic across the full stack.
NPM ecosystem
Largest package registry with libraries for every use case.
Real-time capable
WebSockets and SSE are first-class citizens in the runtime.
Batteries included
ORM, admin panel, auth, and forms out of the box.
Data science synergy
Seamlessly call ML models and data pipelines in the same language.
Mature tooling
Django REST Framework is proven at enterprise scale.
Readable syntax
Python code is often faster to write and review.
EXPERT GUIDANCE
Concurrency Model
Event loop - efficient for high-throughput I/O workloads.
Language Unification
JavaScript end-to-end - shared types with frontend.
ML / AI Integration
Requires HTTP calls to Python services or ONNX runtime.
Admin Interface
Must build or adopt a third-party admin (e.g., AdminJS).
Startup Speed
Fast cold starts; suits serverless deployments.
Best For
Real-time APIs, microservices, unified JS teams.
Concurrency Model
Thread-per-request or async with ASGI; more setup.
Language Unification
Python backend + JS frontend - two languages to maintain.
ML / AI Integration
Native access to NumPy, PyTorch, scikit-learn, etc.
Admin Interface
Auto-generated Django admin panel included.
Startup Speed
Heavier boot time, better for long-lived processes.
Best For
Data-heavy apps, ML pipelines, content-managed sites.
Feature
Node.js
Python / Django
DELIVERABLES
REST API
Fully documented REST API with authentication, validation, error handling, and rate limiting.
Database Layer
Optimized PostgreSQL schema with migrations, indexes, and connection pooling via PgBouncer.
Auth System
JWT or session-based authentication with refresh tokens, OAuth, and RBAC.
Real-Time Service
WebSocket or Server-Sent Events layer for live updates, notifications, and chat.
Queue & Workers
Background job processing with BullMQ and Redis for email, webhooks, and heavy tasks.
Observability Setup
Structured logging, health endpoints, and error tracking with Sentry or Datadog.
INDUSTRIES
We build powerful digital experiences across various sectors, ensuring your product meets unique market demands.
Data-driven commerce solutions that improve journeys, boost sales, and optimize operations.
Data-driven commerce solutions that improve journeys, increase sales, and optimize operations.
Reliable medical platforms that protect patient data, simplify workflows, and support clinical accuracy.
Product-driven platforms that enhance workflows, automate processes, and scale with your business.
CASE STUDIES
START YOUR PROJECT
Expert developers ready to deliver high-quality digital products.
INSIGHTS
Thirteen Ukrainian app development companies, each named with a link to its own site and described only from what that site claims. Alphabetical, no scores, no prices. Kultrix is one of the thirteen.
2026-08-26
What an app costs and how long it takes, in hours: a mobile base is 320-520 hours, all fifteen modules from 40-90 to 150-340 hours, and a plan built on 18 focused hours a week.
2026-08-24
How to choose a software development agency: what to ask, what to ask them to show, and how to compare two proposals by stripping the rates out and reading the hours.
2026-08-24
FAQ
Node.js uses a non-blocking, event-driven architecture that handles thousands of concurrent connections efficiently. Its JavaScript runtime means frontend and backend share the same language, reducing context switching and enabling code reuse.
We use Fastify for new projects. It is 2-3x faster than Express, has a built-in schema validation system using JSON Schema, and TypeScript support out of the box. Express is fine for smaller projects or when integrating with existing Express middleware ecosystems.
Yes - always. TypeScript in Node.js catches contract mismatches between your API handlers, database models, and client types at compile time. We configure strict mode, path aliases, and esbuild or tsx for fast development builds.
For relational data we use Prisma or Drizzle ORM on top of PostgreSQL. For raw performance-critical queries, we drop to pg directly with typed results. Connection pooling with PgBouncer keeps connection counts manageable under load.
We use BullMQ with Redis for durable, retryable background jobs - sending emails, processing webhooks, generating reports, and other async tasks that should not block API responses.
We implement HTTPS everywhere, helmet.js for security headers, parameterized queries to prevent SQL injection, rate limiting with Redis, input validation with Zod, and JWT with short expiry plus refresh token rotation. We also run OWASP-based security reviews before launch.
Yes. Node.js excels at I/O-bound workloads - serving thousands of concurrent API requests with minimal memory. We pair it with Redis caching, CDN offloading, and horizontal scaling behind a load balancer for high-traffic production environments.
Yes. We design microservice architectures when the problem warrants it - independent deployability, team autonomy, or extreme scale. We use message queues (RabbitMQ, Kafka) for service communication and Docker + Kubernetes or Railway for orchestration.
Absolutely. Kultrix regularly performs Node.js backend audits - reviewing code quality, query performance, security vulnerabilities, and scalability bottlenecks. We deliver a prioritized report with concrete fixes.
We set up structured JSON logging with Pino, expose /health and /metrics endpoints, integrate Sentry for error tracking, and configure uptime monitoring. For high-traffic APIs, we add APM tooling like Datadog or New Relic for request tracing.
Docker containers on Railway, AWS ECS, or Fly.io are our preferred choices. We configure PM2 for process management on bare servers, set up CI/CD with GitHub Actions, and implement zero-downtime deployments with health check gates.
A standalone REST API takes 4-8 weeks. A complete backend including auth, background jobs, and third-party integrations takes 2-4 months. Kultrix scopes each engagement with a detailed breakdown after discovery.
