Backend Developer (Node.js/Nest.js) · Poland, Warsaw ·

Zexter; Warszawa; Híbrido; PLN 180.000 - 320.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Fully remote work

International team

Modern tech stack + AI tools

Descripción de la vacante

Zexter is an ambitious product building its own technological ecosystem in the iGaming space. We are developing our in-house platform and expanding our product line to adapt quickly to market needs and drive innovations with speed.

We are looking for a Backend Developer to join our team and help us build scalable, reliable, and high-performance backend solutions for our iGaming products. You’ll own features from development to production and work with engineers and cross-functional teams.

Formación

• 5+ years backend development with Node.js and TypeScript.
• 5+ years Postgres and relational DB experience.
• 5+ years NestJS experience.
• Strong SQL, indexing, and performance analysis skills.
• Experience with high-load production systems and testing.
• Experience with Redis, queues, and event-driven architectures.
• Docker, Kubernetes, CI/CD and cloud infrastructure experience.
• Focus on clean architecture, REST API design, and reliability.
• Ability to own features from implementation to production and incident handling.
• Excellent communication and ability to work under deadlines.

Responsabilidades

• Build scalable, reliable backend services for iGaming products.
• Own backend features from development to production deployment.
• Collaborate with engineers and cross-functional teams.
• Write clean, maintainable, testable code with good reviews.
• Identify bottlenecks and optimize performance under heavy traffic.

Conocimientos

Node.js

TypeScript

PostgreSQL

NestJS

REST API design

Docker

Kubernetes

CI/CD

Redis

High-load systems

Testing (unit/integration)

Auditability & transactions

Herramientas

Cloud infrastructure

Descripción del empleo

Zexter is an ambitious product building its own technological ecosystem in the iGaming space.

We are developing our in-house platform, which is already live and actively operating, while also expanding our product line, allowing us to adapt quickly to market needs and implement innovations at speed.

We are looking for a Backend Developer to join our team and help us build scalable, reliable, and high-performance backend solutions for our iGaming products. You’ll work closely with other engineers and cross-functional teams, taking ownership of backend features from development to production.

Requirements

• 5+ years of commercial backend development experience withNode.jsandTypeScript.
• 5+ years of hands‑on production experience withPostgreSQLand other relational databases.
• Strong SQL expertise, including:
  • Query optimization for high-load systems.
  • Index design and performance analysis.
  • Transaction management and concurrency control.
  • Identifying and resolving database performance bottlenecks.
• 5+ years of commercial experience withNestJS.
• Excellent understanding of:
  • Dependency Injection.
  • Modular application architecture.
  • Clean Architecture and software design principles.
  • REST API design and backend service architecture.
• Experience developing and maintaining high-load production systems.
• Solid experience with automated testing (unit/component and integration tests).
• Experience with load and performance testing, including bottleneck identification and validating system behavior under heavy traffic.
• Experience with Redis, message queues, background jobs, and event-driven architecture.
• Experience with Docker, Kubernetes, CI/CD pipelines, and cloud infrastructure.
• Experience working on systems wherefinancial accuracy, idempotency, transaction consistency, and auditabilityare critical.
• Ability to write clean, maintainable, testable, and well-structured code.
• Strong ownership mindset, taking responsibility for features from implementation and testing through deployment, monitoring, and production incident resolution.
• Strong communication skills with the ability to clearly explain technical decisions, implementation details, and associated risks.
• Ability to work effectively under deadlines and independently prioritize tasks.
• Experience with code reviews, debugging, logging, monitoring, and production incident investigation.

Nice to Have

• Experience in the iGaming industry
• Experience developing or maintaining backend systems for online casinos, sports betting, gaming platforms, wallets, payment systems, or transaction processing.
• Experience integrating third-party game providers, payment gateways, or other external services.
• Practical experience using AI-powered developer assistants (Cursor, Claude, or similar).

What We Offer

• Fully remote work.
• Opportunity to work in a fast-growing international iGaming company.
• Opportunity to work with a modern technology stack, a strong engineering team, minimal bureaucracy, and AI-powered development tools that help eliminate routine work.