Node.js Developer

Quick Facts

• Role: Node.js Developer (Back-end)

• Focus: Scalable back-end services and REST API development

• Work model: Hybrid (Warsaw) — form to be agreed

Description

You will design and develop scalable back-end services using Node.js, TypeScript, and NestJS, working comfortably in a microservices architecture. The role includes building and maintaining REST APIs following CQS and clean architecture, integrating with external systems via REST/HTTP, queues, and databases, and ensuring features are covered with tests using TDD/BDD.

Responsibilities

• Design and implement scalable back-end services in NestJS + TypeScript

• Create and maintain REST APIs according to CQS and clean architecture

• Collaborate with front-end and DevOps teams to define API contracts and integrations

• Integrate with external systems via REST/HTTP, queues, and databases

• Design new features and cover them with tests (including TDD / BDD)

• Prepare technical documentation and diagrams (e.g., PlantUML, Swagger/OpenAPI)

• Participate in Scrum ceremonies: Daily, Planning, Refinement, Review, Retrospective

• Perform code reviews and maintain high code quality

• Share knowledge via tips&tricks and materials on Confluence

• Work in a DevOps-oriented way: CI/CD, monitoring, and containerization

Requirements

• Minimum 4–5 years of commercial back-end development

• Very strong Node.js knowledge (LTS preferred)

• Very strong TypeScript (types, classes, decorators, generics)

• Experience with NestJS or another DI-based architectural framework

• Knowledge of CQS and RESTful API design principles

• Experience with queue systems and asynchronous data processing (RabbitMQ or Kafka)

• Database knowledge, especially PostgreSQL (relational modeling, query optimization)

• Understanding of Clean Code, SOLID, KISS, DRY

• Docker knowledge (Dockerfile and container configuration)

• Basic Kubernetes knowledge (Deployment, ConfigMap, Service)

• Very strong Git knowledge and repository best practices (git-flow, squash, code review)

• CI/CD tools knowledge, especially GitLab Pipelines

• Developer-level knowledge of Linux/UNIX

Benefits

• Long-term collaboration based on a B2B contract stability

• Real impact on systems through your technical analysis

• Development of analytical competencies in complex system and business projects

• Expert environment with experienced IT and business teams

• Collaboration culture focused on communication, analysis, and solution quality