Senior Software Engineer - Node.js

Please note - this is a hybrid role, with 3 days per week working from our office in Warsaw.

About

We are looking for an experienced Node.js Developer to join our web development team. In this role, you will build and maintain server-side applications and APIs. You should have strong JavaScript skills, good knowledge of backend systems, and experience working with databases and cloud platforms.

Responsibilities

• Build and maintain server-side applications using Node.js

• Design and develop REST and GraphQL APIs

• Improve application speed, scalability, and security

• Connect backend systems with front-end parts and external services

• Work closely with product managers, designers, and other developers

• Write clean, easy-to-read, and well-documented code

• Take part in code reviews and team discussions

• Find and fix issues in production systems

• Keep learning new technologies and follow best practices

Requirements

• Strong experience with Node.js and JavaScript (ES6+)

• Experience with Express.js or similar Node.js frameworks

• Good understanding of asynchronous and event-based programming

• Knowledge of REST APIs, WebSockets, and GraphQL

• Experience with databases such as MongoDB, PostgreSQL, or MySQL

• Experience using version control tools like Git

• Strong problem-solving skills and attention to detail

• Experience writing unit tests using tools like Mocha or Chai

• Knowledge of authentication systems, including OAuth and OpenID

• Good understanding of data structures, algorithms, and software design

• Strong analytical and debugging skills

Nice to Have

• Experience with cloud platforms such as AWS, Google Cloud, or Azure

• Knowledge of microservices architecture

• Experience with testing tools like Jest or Mocha

• Familiarity with Agile or Scrum ways of working

• Experience building RAG applications and working with vector databases

• Experience setting up CI pipelines for testing and code quality checks