Senior Node.js Developer – Digital Advertising Ecosystem

🏢 Summary: Senior Node.js Developer role focused on building and maintaining distributed backend systems for digital advertising and identity management using Node.js and NestJS. The position involves full lifecycle development, performance optimization, automated testing, and monitoring within a non-monolithic architecture. It also includes contributing to R&D initiatives to evolve the advertising ecosystem. 🗂️ Requirements: Higher education in Computer Science or related field, Minimum 5 years of programming experience, At least 5 years of Node.js development experience, Experience in backend application design, Experience in performance optimization, Experience in application monitoring, Experience with distributed (non-monolithic) architecture, Proficiency in automated testing development, Very good knowledge of Node.js and TypeScript, Very good knowledge of NestJS or Fastify, Experience with MongoDB and Redis, Experience with AWS S3, Knowledge of object-oriented and functional JavaScript, Experience in event-driven development, Knowledge of design patterns and best practices, Experience with Git and GitHub, English proficiency for technical documentation 📃 Skills: Node.js, TypeScript, NestJS, Fastify, MongoDB, Redis, AWS, S3, JavaScript, GIT, GitHub, Babel, Jest, Jasmine, Karma, Cypress, Datadog, Jenkins, Unix, Bash, React, NoSQL 🏢 Description: Shape the Future of Digital Advertising as a Senior Node.js Developer! Krakow/Warsaw-based opportunity with almost fully remote work model (1 day in the office/month). As a Senior Node.js Developer you'll be working for our client, a prominent player in the media industry. You will join the team and take responsibility for the development and maintenance of backend applications (Node.js, NestJS) in the field of digital advertising serving technologies and identity management, built in a distributed (non-monolithic) architecture. We are seeking someone actively engaged in improving the quality of solutions and processes, including the development of automated tests and monitoring tools, as well as co-creating new directions for the development of the advertising ecosystem (R&D). 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. Actively participate in creating new solutions and development directions for the advertising ecosystem (R&D). Participate in the full software development lifecycle: from requirements clarification, through design, implementation, deployment, to maintenance and monitoring. You're ideal for this role if you have: Higher education, preferably in Computer Science. Minimum 5 years of programming experience in IT projects. At least 5 years of experience in Node.js project development. Experience in application design, performance optimization, and monitoring. Ability to decompose tasks effectively. Very good knowledge of: Node.js, TypeScript Frameworks such as NestJS, Fastify Databases: MongoDB, Redis AWS S3 bucket Object-oriented and functional programming in JavaScript Event-driven development Design patterns and best practices Version control systems: GIT, GitHub Babel tools Willingness for active professional growth English language skills sufficient for reading/writing technical documentation Nice to have: Knowledge of digital/programmatic advertising Familiarity with React.js and NoSQL databases Comfortable working in Unix environments, including writing bash scripts Experience with Jenkins Familiarity with Agile / Scrum / KANBAN methodologies Experience with Datadog Familiarity with test frameworks like Jest, Jasmine, Karma, Cypress Ability to write unit, functional, and integration tests

🏢 Summary: Senior Node.js Developer role focused on building and maintaining backend systems for digital advertising and identity management within a distributed architecture. The position involves full lifecycle development, performance optimization, monitoring, and R&D initiatives in a hybrid or remote model. The role requires strong expertise in Node.js and related technologies to deliver scalable, high-performance solutions. 🗂️ Requirements: Higher education in Computer Science or related field, Minimum 5 years of professional programming experience, Minimum 5 years of hands-on Node.js experience, Strong knowledge of application design and performance optimization, Experience with backend frameworks (NestJS or Fastify), Experience with MongoDB and Redis, Experience with AWS services (including S3), Knowledge of event-driven architecture and design patterns, Experience with Git and GitHub, Experience working in Unix environments and Bash scripting, Good command of English (technical documentation), Communicative Polish, Legal right to work in the European Union 📃 Skills: Node.js, TypeScript, NestJS, Fastify, MongoDB, Redis, AWS, S3, JavaScript, Git, GitHub, Bash, Unix, Babel, OOP, FP, EventDriven, DesignPatterns, Monitoring, Testing, Polish, English 🏢 Description: 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.

🏢 Summary: The offer is for a Senior JavaScript Engineer to design and develop scalable APIs and services that enhance digital publishing platforms in a fully remote setup (Poland). The role focuses on building high-performance Node.js and TypeScript solutions, integrating AI-driven features, and working with distributed cloud architectures. The engineer will contribute to scalable systems, automated testing, and advanced AI orchestration within a media environment. 🗂️ Requirements: Experience developing JavaScript APIs and services using Node.js, Experience with TypeScript in large-scale projects, Knowledge of distributed systems and scalability, Knowledge of cloud architecture (preferably AWS), Ability to work with structured and unstructured data formats, Experience with storage systems (blob storage, MySQL, document storage), Experience building and integrating RAG pipelines, Experience with multi-step workflows and AI orchestration, Familiarity with LLM integration patterns, Experience implementing AI solutions on AWS or equivalent platforms 📃 Skills: JavaScript, Node.js, TypeScript, AWS, MySQL, Blob, RAG, LLM, AI, OpenSearch, Bedrock 🏢 Description: INDUSTRY: Media LOCATION: 100% remote (in Poland) REMUNERATION: up to 140 pln/h , B2B PROJECT LANGUAGE: English Summary: The Senior JavaScript Engineer plays a key role in advancing the company’s digital publishing capabilities by designing and developing scalable APIs and services that enhance the user experience through seamless technology integration. Main Responsibilities: Immerse yourself in the technical ecosystem. Develop and test new features, and support existing ones. Build reusable code, packages, and libraries for future use. Optimize code for speed and scalability within an agreed performance budget. Utilize testing frameworks to ensure automated test coverage for platform functionality. Collaborate with team members, including the Delivery Manager and Product Owner, to plan new functionalities or major enhancements. Write and improve technical documentation when necessary. Key Requirements: Experience developing JavaScript APIs and services using Node.js and TypeScript. Experience working with Node/TypeScript in large-scale projects. Knowledge of distributed systems, scalability, and cloud architecture (preferably AWS). Ability to build and work with mixed data formats (structured and unstructured) and storage systems (e.g., blob storage, MySQL, Document Storage). Experience in building and integrating with RAG pipelines. Experience with multi-step workflows and AI orchestration. Familiarity with LLM integration patterns. Experience implementing AI solutions on AWS or equivalent platforms. Nice to Have: Experience with model access and orchestration (e.g., Amazon Bedrock). Knowledge of vector and semantic search (e.g., Amazon OpenSearch). Other Details: Open, collaborative, and dynamic work environment. Active initiatives supporting a diverse and inclusive workplace.

🏢 Summary: Senior Frontend Developer role focused on building and optimizing high-performance self-serve advertising platforms in the AdTech domain using modern JavaScript frameworks. The position involves implementing campaign management flows, pricing logic, financial calculations, and integrating programmatic components. Fully remote B2B contract for 6 months with possible extension. 🗂️ Requirements: Proficiency in Nuxt (Vue 3), Strong TypeScript knowledge including Generics and Interfaces, Experience with Pinia state management, Knowledge of PrimeVue 4, Knowledge of Tailwind CSS, Familiarity with AJV or Zod, Experience with dayjs, Experience with decimal.js, Experience with domain-driven architecture, Experience with performance optimization 📃 Skills: Nuxt, Vue, TypeScript, Pinia, PrimeVue, Tailwind, AJV, Zod, dayjs, decimal.js, JavaScript 🏢 Description: 🌍Work mode : remote. 💰 Rate: 140 -160 PLN/h on B2B. ⏰ Start : ASAP/ 1 msc. ⏳ Project length : 6 months + extensions. 📕Project language : English. ⚙️ Industry : AdTech. 💼 Workload : Full time. ⚙️ Recruitment process -1 technical interview. 💻 Equipment : work on own equipment. Summary: The role of the Senior Frontend Developer focuses on leading the development of high-performance frontend applications within the Ad-Tech domain , leveraging modern JavaScript frameworks . Main Responsibilities: Develop and maintain self-serve advertising platforms. Implement campaign management & booking flows. Actively contribute to pricing logic & financial calculations. Integrate SSP/DSP or programmatic components. Create and manage reporting & validation-heavy interfaces. Key Requirements: Proficient in Nuxt (Vue 3) . Strong command of TypeScript , including Generics and Interfaces. Experience with Pinia for state management. Knowledge of PrimeVue 4 and Tailwind CSS. Familiarity with AJV / Zod validation libraries. Skillful in dayjs & decimal.js . Experience with domain-driven architecture and performance optimization. Nice to Have: Experience with Nuxt Layers and modular architecture. Familiarity with the Mapper pattern (DTO → Domain). Experience with ESLint 9.

🏢 Summary: Full-time Senior Back-End Engineer (Node.js) role focused on designing and maintaining scalable, high-performance server-side applications and APIs for modern, data-driven platforms. The position involves building RESTful services, integrating with third-party systems, ensuring code quality through testing, and optimizing system reliability and performance. Hybrid work model in Warsaw with B2B or CoE contract options. 🗂️ Requirements: Strong experience with Node.js, Strong experience with Express.js, Experience building and integrating APIs (GraphQL or REST), Knowledge of OAuth, JWT, and session-based authentication, Experience with MySQL, Experience with PostgreSQL, Experience writing unit tests with Chai and Mocha, Experience using Git and version control systems 📃 Skills: Node.js, Express.js, GraphQL, REST, OAuth, JWT, MySQL, PostgreSQL, Chai, Mocha, Git 🏢 Description: Senior Back-End Engineer (Node.js) 💰 Salary: 18,700-20,900 PLN/Month 💻 Warsaw, Poland (Hybrid - 3 days in office, 2 days remote) 🕦 Full-time ☑️ B2B or CoE We’re looking for a Senior Back-End Engineer to join a fast-growing international tech company focused on building modern, data-driven platforms that power digital transformation in the financial and enterprise sectors. Requirements: Strong experience in building server-side applications using Node.js and Express.js. Hands-on experience with API development and integration, particularly with GraphQL or RESTful services. Strong knowledge of authentication and authorization mechanisms (OAuth, JWT, session-based). Strong experience with databases such as MySQL and  PostgreSQL. Experience writing unit tests with tools such as Chai and Mocha. Strong experience using Git and version control systems. Proficiency in English (both written and spoken). Nice To have: Bachelor’s degree in Computer Science or a related field. Experience with cloud platforms (AWS, Azure, or GCP), as well as containerization and orchestration tools such as Docker and Kubernetes. Experience with microservices architecture. Experience setting up CI for static analysis and test execution. Experience developing RAG applications and storing data in vector embeddings. Key Responsibilities: Design, build, and maintain scalable, high-performance server-side applications and RESTful APIs using Node.js and Express.js. Guide and supervise the development of key code components to ensure long-term reliability and scalability. Integrate with front-end components and third-party services. Actively review the codebase, recommending and implementing refinements where needed. Write unit and integration tests and optimize performance to ensure high-quality code. Collaborate closely with cross-functional teams to define and implement technical solutions. Improve system performance, reliability, and long-term maintainability through optimization and best practices. Get to know DevsData: We are a technology consulting company and a recruitment agency, delivering software solutions to clients from Europe and the US. We work 100% remotely, in an international team, including people from Asia, London, or San Francisco. We employ people with experience in international corporations as well as students of the best technical and business universities. Find out more: https://devsdata.com/

🏢 Summary: Senior Frontend Developer role focused on building and leading high-performance frontend applications for self-serve advertising platforms in the AdTech domain. The project involves developing campaign management flows, pricing logic, and integrating programmatic components using modern JavaScript frameworks. Fully remote B2B contract for 6 months with possible extensions. 🗂️ Requirements: Proficiency in Nuxt (Vue 3), Strong TypeScript knowledge including Generics and Interfaces, Experience with Pinia state management, Knowledge of PrimeVue 4, Knowledge of Tailwind CSS, Familiarity with AJV or Zod validation libraries, Experience with dayjs and decimal.js, Experience with SSP/DSP or programmatic integrations, Experience with domain-driven architecture, Performance optimization skills 📃 Skills: Nuxt, Vue, TypeScript, Pinia, PrimeVue, Tailwind, AJV, Zod, dayjs, decimal.js, SSP, DSP, JavaScript, ESLint 🏢 Description: 🌍Work mode : remote. 💰 Rate: 140 -160 PLN/h on B2B. ⏰ Start : ASAP/ 1 msc. ⏳ Project length : 6 months + extensions. 📕Project language : English. ⚙️ Industry : AdTech. 💼 Workload : Full time. ⚙️ Recruitment process -1 technical interview. 💻 Equipment : work on own equipment. Summary: The role of the Senior Frontend Developer focuses on leading the development of high-performance frontend applications within the Ad-Tech domain , leveraging modern JavaScript frameworks . Main Responsibilities: Develop and maintain self-serve advertising platforms. Implement campaign management & booking flows. Actively contribute to pricing logic & financial calculations. Integrate SSP/DSP or programmatic components. Create and manage reporting & validation-heavy interfaces. Key Requirements: Proficient in Nuxt (Vue 3) . Strong command of TypeScript , including Generics and Interfaces. Experience with Pinia for state management. Knowledge of PrimeVue 4 and Tailwind CSS. Familiarity with AJV / Zod validation libraries. Skillful in dayjs & decimal.js . Experience with domain-driven architecture and performance optimization. Nice to Have: Experience with Nuxt Layers and modular architecture. Familiarity with the Mapper pattern (DTO → Domain). Experience with ESLint 9. Other Details: Work Environment: Remote position with significant flexibility in working hours. Industry: Engaging in a dynamic Ad-Tech landscape.

🏢 Summary: Full-time Senior Full Stack Developer role focused on building scalable, data-driven platforms for financial and enterprise sectors using Node.js and React. The position involves designing microservices, developing RESTful APIs, and creating responsive front-end applications in a hybrid work model (Warsaw). 🗂️ Requirements: 5+ years experience as Senior Full Stack Developer, Strong expertise in Node.js, Strong expertise in React, Experience with Express.js, Experience building RESTful or GraphQL APIs, Knowledge of OAuth and JWT authentication, Proficiency in Redux, HTML5, CSS3, ES6+, Experience with Vite, Webpack or Babel, Experience with MySQL or PostgreSQL, Experience with AWS, Azure or GCP, Experience with Docker and Kubernetes, Proficiency with Git 📃 Skills: Node.js, React, Express.js, GraphQL, REST, OAuth, JWT, Redux, HTML5, CSS3, JavaScript, ES6, Vite, Webpack, Babel, MySQL, PostgreSQL, AWS, Azure, GCP, Docker, Kubernetes, Git, SQL, MongoDB, CI/CD 🏢 Description: Senior Full Stack Developer (Node.js + React) 💰 Salary: 23,000-24,800 PLN/Month 💻 Warsaw, Poland (Hybrid - 3 days in office, 2 days remote) 🕦 Full-time ☑️ B2B or CoE We’re looking for a Senior Full-Stack Developer to join a fast-growing international tech company focused on building modern, data-driven platforms that power digital transformation in the financial and enterprise sectors. Requirements: 5+ years of experience as a Senior Full Stack Developer with significant expertise in Node.js and React. Strong experience in building server-side applications using Node.js and Express.js. Hands-on experience with API development and integration, particularly with GraphQL or RESTful services. Strong knowledge of authentication and authorization mechanisms (OAuth, JWT, session-based). Front-end proficiency in React.js, Redux, HTML5, CSS3, and modern JavaScript (ES6+). Familiarity with front-end build tools such as Vite, Webpack, and Babel. Strong experience with databases such as MySQL and  PostgreSQL. Experience with cloud platforms (AWS, Azure, or GCP), as well as containerization and orchestration tools such as Docker and Kubernetes. Strong experience using Git and version control systems. Proficiency in English (both written and spoken). Key Responsibilities: Design, build, and maintain scalable, high-performance server-side applications and RESTful APIs using Node.js and Express.js. Develop and maintain interactive, responsive user interfaces using React.js, Redux, and modern JavaScript (ES6+). Lead the design and implementation of scalable architectures and microservices. Work closely with database engineers to design efficient schemas and manage data interactions using SQL databases or MongoDB. Ensure reliable deployments and smooth release of updates using CI/CD pipelines and Docker. Write unit and integration tests and optimize performance to ensure high-quality code. Collaborate closely with cross-functional teams to define and implement technical solutions. Improve system performance, reliability, and long-term maintainability through optimization and best practices. Get to know DevsData: We are a technology consulting company and a recruitment agency, delivering software solutions to clients from Europe and the US. We work 100% remotely, in an international team, including people from Asia, London, or San Francisco. We employ people with experience in international corporations as well as students of the best technical and business universities. Find out more: https://devsdata.com/

🏢 Summary: Senior Fullstack Engineer role focused on building intelligent advertising systems using React and Kotlin, including ML-driven recommendation engines and automated campaign management tools. The position involves developing scalable, event-driven cloud architectures and high-performance APIs for analytical platforms within a GCP environment. Hybrid work model in Warsaw with strong emphasis on modern microservices and microfrontend architectures. 🗂️ Requirements: Minimum 3 years of full-stack development experience, Strong experience with React and Kotlin, Proficiency in TypeScript, HTML, CSS, Experience with Spring Boot and microservices architecture, Experience with GCP cloud environment, Experience with MongoDB and SQL databases, Understanding of event-driven architectures and large-scale data processing, Experience with testing frameworks such as Jest, Vitest, or Playwright, Communicative Polish and English, Legal right to work in the European Union 📃 Skills: Kotlin, React, TypeScript, HTML, CSS, SpringBoot, MongoDB, SQL, GCP, Microservices, Microfrontends, Jest, Vitest, Playwright, APIs, SSR, Accessibility, EventDriven 🏢 Description: Unleash innovation — design the future of intelligent advertising ecosystems! Warszawa-based opportunity with hybrid work model. As a Senior Fullstack Engineer – React and Kotlin Specialists , you will be working for our client, a leader in building advanced advertising tools, focusing on creating intelligent recommendation systems and automating campaign management for advertisers on Allegro Ads. Join a mission-driven project that revolutionizes how businesses grow through cutting-edge technology and data-driven insights, offering exciting avenues for professional growth and innovation. Your main responsibilities: Develop and maintain backend services using Kotlin, integrating machine learning-driven recommendation engines in collaboration with data science teams. Build scalable, event-driven architectures to process large data volumes within cloud environments, leveraging GCP. Design and implement high-performance APIs to support analytical dashboards and market benchmarks. Create and optimize scalable microfrontends using React, prioritizing accessibility and server-side rendering for analytical tools. Collaborate with cross-functional teams to deliver seamless, secure, and efficient software solutions. Ensure high code quality through testing frameworks such as Jest, Vitest, or Playwright, with a focus on performance and reliability. Contribute to evolving microservice architectures, utilizing Spring Boot, MongoDB, SQL, and cloud-native tools. Participate actively in code reviews, sprint planning, and technical discussions to foster continuous improvement. You're ideal for this role if you have: At least 3 years of experience in full-stack development, with a focus on React and Kotlin. Strong proficiency in TypeScript, React, HTML/CSS, and backend technologies like Kotlin, Spring Boot, and microservices. Experience working with cloud ecosystems, preferably GCP. Solid understanding of database management, including MongoDB and SQL. Familiarity with event-driven architectures and large-scale data processing. Ability to communicate effectively in Polish and English. Experience working in an Agile environment with a focus on delivering high-quality software. It is a strong plus if you have: (optional) Certifications related to GCP or microservices architecture. Experience with agentic coding tools like Copilot/OpenCode. Knowledge of accessibility standards (a11y) and performance optimization techniques. Language Required for the role: Polish (Communicative) English (Communicative) Eligibility for this 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.

🏢 Summary: B2B contract opportunity for a Senior Node.js Developer to design, build, and maintain scalable backend applications and APIs across diverse software projects, including AI-driven and legacy modernization initiatives. The role focuses on high-quality Node.js development, architecture contribution, and cloud-based deployments in Agile teams. 🗂️ Requirements: 5+ years of experience in Node.js development, Experience with Express.js or NestJS frameworks, Strong knowledge of JavaScript and TypeScript, Understanding of asynchronous programming and event-driven architecture, Experience building and integrating RESTful APIs, Experience with SQL and NoSQL databases, Experience with cloud platforms (AWS, Azure, or GCP), Knowledge of CI/CD pipelines, Experience with version control systems, Experience working in Agile/Scrum teams, English level B2 or higher, Experience with AI technologies and AI-powered features development 📃 Skills: Node.js, Express.js, NestJS, JavaScript, TypeScript, REST, SQL, NoSQL, PostgreSQL, MySQL, MongoDB, AWS, Azure, GCP, CI/CD, Git, AI 🏢 Description: Who we are: We are Inspeerity (part of DevelopX group), engineering consultancy providing software development and consultancy. Our primary expertise is systems architecture and full stack development – from defining project requirements, to designing, building, and deploying software applications for web, backend, enterprise and mobile. We are crazy about technology, serious about people. About position: We are currently building our talent pool for future Senior Node.js Developer roles. As our company is expanding, you may have the opportunity to work on a variety of software solutions across multiple initiatives, including projects we will be delivering in the future, from building native AI solutions to modernizing legacy systems. If you enjoy collaborating in a skilled team and are committed to delivering top-notch software, we’d love to connect. We're not prescriptive about background. Whether you've worked in fintech, SaaS, e-commerce, or enterprise systems — what matters is that you've shipped production software at scale, cared about its reliability, and learned from what broke. TL;DR • Who: Senior Node.js Developer • Contract Type: B2B Framework Agreement • Salary range: Up to 150 PLN/h • Company: Software House What you’ll be doing: • Designing, implementing, and maintaining high-quality Node.js applications. • Developing backend components and APIs to support scalable software solutions. • Collaborating with cross-functional teams. • Reviewing and refactoring code to ensure maintainability, performance, and security. • Participating in technical design discussions and contributing to architecture decisions. • Writing and maintaining technical documentation for systems, APIs, and processes. • Supporting deployment and integration of applications in different environments. You will be the best fit if you have: • 5+ years of experience as a Node.js developer, preferably with exposure to frameworks such as Express.js , NestJS , or similar. • Strong understanding of JavaScript/TypeScript, asynchronous programming, and event-driven architecture. • Experience with RESTful APIs and web services integration. • Familiarity with SQL and NoSQL databases (e.g., PostgreSQL, MySQL, MongoDB). • Experience with cloud environments such as AWS, Azure, or GCP. • Knowledge of CI/CD pipelines and version control systems. • Strong problem-solving skills and ability to troubleshoot complex issues. • Experience working in Agile/Scrum teams and contributing to iterative development. • English level B2 or higher. • Experience with AI technologies, including using AI tools for development and building AI-powered features or applications. What we offer • Remote work or working from our Bialystok, Warsaw, Rzeszow offices. It's up to you! • Collaboration with experienced and engaged people who will appreciate your work and support you whenever you need it 😊 • Hybrid and flexible cooperation model based on a B2B Framework Agreement. • Great working conditions and best equipment: Dell or MacBook, your choice. Good to know: We don’t require a degree. We don’t do whiteboard puzzles or trick questions. Our interview process is practical: a technical conversation, and a chat about how you work. We value direct communication and intellectual curiosity. If you’re someone who gets excited debugging a tricky concurrency issue - not because you have to, but because you want to understand it — we’ll get along well.

🏢 Summary: Senior Backend Engineer role focused on building secure, scalable backend services in Python and Node.js for advanced cybersecurity platforms. The position involves architecting and operating cloud-native solutions on GCP, optimizing databases, and implementing secure authentication flows. You will drive automation, reliability, and best practices in a hybrid Krakow-based environment. 🗂️ Requirements: Minimum 6 years backend development experience, Expertise in Python, Expertise in Django, Expertise in Node.js, Expertise in TypeScript, Experience with NestJS, Hands-on experience with GCP services, Experience with GKE, Experience with Cloud Run, Experience with Pub/Sub, Experience with Terraform, Strong knowledge of security principles, Experience implementing OAuth2, Experience implementing OpenID Connect, Experience with PostgreSQL, Ability to design scalable backend systems, Fluent English, Legal right to work in the EU 📃 Skills: Python, Django, Node.js, TypeScript, NestJS, GCP, GKE, CloudRun, PubSub, PostgreSQL, Terraform, OAuth2, OpenIDConnect, Go, Rust, Filestore 🏢 Description: Unleash innovation in security — shape the future of cyber defense! Krakow-based opportunity with hybrid work model As a Senior Python & Node.js Backend Engineer , you will be working for our client, a leading player in the cybersecurity industry, dedicated to building cutting-edge security platforms that protect organizations worldwide. You will contribute to developing innovative solutions that enhance digital safety, automation, and reliability—driving the next generation of security technology. Your main responsibilities: Hands-on development of high-quality, production-grade backend services in Python (Django) and Node.js (TypeScript/NestJS). Architect scalable, secure solutions on Google Cloud Platform (GKE, Cloud Run, Pub/Sub) and optimize PostgreSQL database performance. Lead the lifecycle management of cloud-native services, ensuring resilience, observability, and cost-efficiency. Design and implement OAuth2/OpenID Connect flows within GCP environments. Translate business opportunities into effective technical solutions. Develop automation to improve deployment, monitoring, and maintenance processes. Mentor team members and promote engineering best practices. Stay updated with the latest industry trends and share knowledge across teams. You're ideal for this role if you have: At least 6 years of experience in backend development or related fields. Deep expertise in Python (Django) and Node.js (TypeScript/NestJS). Hands-on experience with GCP services (Cloud Run, GKE, Filestore) and Infrastructure as Code (Terraform). Strong understanding of security principles, including zero trust models. Ability to build scalable, high-performance backend services, including some experience with Go or similar languages. A full-stack understanding with a focus on backend systems. Proven track record of creating secure, reliable, and efficient backend solutions. Demonstrated mastery in your technical discipline and a passion for engineering excellence. It is a strong plus if you have: Experience with Go, Rust, or other emerging languages. The ability to identify problems or opportunities and engineer effective solutions. Respected for your craftsmanship, not just your ideas. A holistic view to complex problem solving. Language Required for the role: Fluent English (written and spoken) 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.