Development services · Warsaw, Poland

Backend developer in Warsaw, Poland and Europe

Server-side logic, databases, authentication and APIs - I build backends that are secure, documented and ready for production traffic from day one.

Backend developer Warsaw Laravel Node PHP

Backend development scope

  • REST and GraphQL API design and implementation
  • Laravel, Symfony, Node.js and Django applications
  • PostgreSQL, MySQL and MongoDB schema design
  • JWT/session auth, OAuth and role-based access control
  • Payment gateways: Stripe, PayU, Przelewy24
  • Queue workers, cron jobs, webhooks and email queues
  • Admin panels and internal tooling

Backend engineering approach

I write migrations, seeders and API docs so the next developer is not lost.

Business rules live in the service layer - not scattered in controllers or Blade templates.

SQL queries are indexed and explained; N+1 problems are fixed before launch.

Polish e-commerce backends handle VAT, invoices and local payment callbacks correctly.

US SaaS backends support subscriptions, webhooks and idempotent payment handling.

Backend stack

PHP 8+LaravelSymfonyNode.jsPythonDjangoPostgreSQLMySQLMongoDBRedisDocker

Technical overview

How I design and maintain backends

Backend development for me means APIs, databases and business rules that hold up under real traffic. I build Laravel, Symfony, Node and Django services with migrations, validation layers and clear logging so the next engineer can follow how permissions and money flows work.

I design PostgreSQL and MySQL schemas around actual queries, add queue workers for email and webhooks, and keep auth flows tight. Payment and status callbacks are idempotent so a retried webhook does not create duplicate charges or orders.

Admin panels and internal tools belong to the same backend job. Operators need filters, exports and role-based access. I document OpenAPI where teams consume the API, and keep secrets in environment config rather than in the repository.

Common backend tasks I help with

  1. How to design a REST API with versioning and pagination
  2. How to stop N+1 queries on a product catalog endpoint
  3. How to make payment webhooks idempotent
  4. How to structure role-based access for an admin panel
  5. How to move business rules out of controllers into a service layer
  6. How to add queue workers for email and file processing
  7. How to write safe database migrations for a live schema
  8. How to store secrets and rotate API keys without downtime
  9. How to add audit logging for sensitive account changes
  10. How to document endpoints with OpenAPI for a frontend team

Warsaw · Poland · Europe · USA

Remote-first development with local presence in Warsaw - the same senior engineer for Polish, European and American clients.

Warsaw

Backend developer Warsaw - custom APIs for local startups replacing WordPress plugins and spreadsheets.

Poland

Laravel and PHP backends for Polish agencies and merchants with PayU and InPost integrations.

Europe

GDPR-compliant logging, EU hosting and cross-border B2B data flows.

USA

Node and Laravel APIs with Stripe billing and US timezone maintenance windows.

Development + SEO

We do not only build - we promote

Clean URLs, fast TTFB and indexable API-driven pages matter for rankings - I pair backend work with SEO so your product is found, not only functional.

Website promotion & SEO
Viktar Liukevich

About me

I'm Viktar Liukevich

Full-stack developer · 15+ years creating web

I am Viktar Liukevich, a backend developer in Warsaw. APIs, databases and payment flows are where I spend most of my week - Laravel, Symfony, Node and Python, always with migrations, validation and audit trails.
Backend is where money and data live. I have built hundreds of integrations for Polish merchants and US SaaS teams - the hard part is rarely CRUD; it is idempotent webhooks, indexed queries and documentation the next developer can follow.
For heavy Python/ML pipelines, .NET enterprise modules or dedicated DBA work on PostgreSQL at scale, I work with specialist partners across Poland, the EU and the US whom I have vetted for years. I own architecture and code review; they deliver in their stack under NDA.
300+
Completed Projects
90+
Clients
10+
Partners

Advantages

  • 15+ years working for myself
  • Wide technology stack
  • Rapid development
  • Warranty and support
  • Global quality standards
  • Working with clients worldwide
  • Innovative technological solutions