Senior Node.js Developer — Digital Advertising and Backend Architecture

Unleash the Future of Digital Advertising — Elevate Backend Architectures with Cutting-Edge Node.js Solutions! Krakow/Warsaw-based opportunity with almost fully remote work model (only 1 day in the office/month). As a Senior Node.js Developer, you will be working for our client, a leading innovator in the media industry. You will join a dynamic team dedicated to advancing digital advertising technologies, focusing on backend development and identity management in a distributed, non-monolithic architecture. This role offers a chance to influence the evolution of advertising ecosystems through innovation and R&D initiatives, fostering your professional growth in a fast-paced environment. Your main responsibilities: • Develop and maintain backend applications (Node.js, NestJS) for digital advertising serving and identity technologies. • Develop and maintain automated tests (tools and test cases). • Develop and maintain monitoring solutions to ensure system reliability. • Actively participate in creating new solutions and shaping development directions (R&D) within the advertising ecosystem. • Participate in the full software development lifecycle: from requirements clarification, through design and implementation, to deployment, maintenance, and monitoring. You're ideal for this role if you have: • Minimum of 5 years of programming experience in IT projects. • At least 5 years of experience in Node.js project development. • Strong knowledge of application design, performance optimization, and system monitoring. • Proficiency in Node.js, TypeScript, NestJS, Fastify. • Experience with MongoDB, Redis, AWS S3. • Ability to decompose tasks effectively and work collaboratively. • Good understanding of object-oriented and functional programming in JavaScript. • Familiarity with event-driven development, design patterns, and best practices. • Experience with version control systems: GIT, GitHub. • Knowledge of Babel tools. • Willingness for active professional growth. • Excellent communicative skills in Polish and sufficient English for reading/writing technical documentation. It is a strong plus if you have: • Knowledge of digital/programmatic advertising. • Familiarity with React.js and NoSQL databases. • Experience working in Unix environments, including writing bash scripts. • Hands-on experience with Jenkins. • Familiarity with Agile, Scrum, or KANBAN methodologies. • Experience with Datadog. • Knowledge of test frameworks like Jest, Jasmine, Karma, Cypress. • Ability to write unit, functional, and integration tests. Language Required for the role: • Communicative proficiency in Polish. • English skills sufficient for technical documentation. Eligibility for the role: • Only candidates with an existing legal right to work in the European Union will be considered for this role. #MAKEYourCareerBETTER Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.