Senior Node.js Developer

🏢 Summary: Full-time Senior Software Engineer role focused on backend development and system integrations for a large-scale job platform. The position involves API integrations, client and partner migrations, and backend services supporting UI applications, with overlap until 19:00–20:00 CET. The role emphasizes independent work on platform transitions and distributed systems. 🗂️ Requirements: Strong Java backend development experience, Experience building and integrating APIs, Experience with Kafka or other messaging/event streaming systems, Experience with MySQL or other relational databases, Experience with NoSQL databases (e.g., DynamoDB), Experience with system integrations or platform migrations, Ability to develop backend services supporting UI applications, Ability to work independently and proactively 📃 Skills: Java, Kafka, MySQL, DynamoDB, SQL, NoSQL, APIs, AWS 🏢 Description: Svitla Systems Inc. is looking for a Senior Software Engineer for a full-time position (40 hours per week) in Europe. Our client is one of the world’s largest and fastest-growing job sites. Overlap till 19:00 - 20:00 CET. Requirements Strong Java backend development experience. Experience building and integrating APIs. Experience with Kafka or other messaging/event streaming systems. Experience with MySQL or other relational databases. Experience working with NoSQL databases (e.g., DynamoDB). Experience working on system integrations or platform migrations. Ability to work on backend services that support UI applications. Work independently, take proactive steps, not just execute on steps. Nice to have Experience with AWS (especially DynamoDB or cloud-native services). Some AI tools experience - Optional, not required. Responsibilities Client and partner migrations, codebase transitions, and integrating systems through API calls. Perform client-side migrations, including: Updating API calls (old → new system), working across multiple client codebases, supporting pipeline / ramp issues. We offer US and EU projects based on advanced technologies. Competitive compensation based on skills and experience. Regular performance appraisals to support your growth. Flexibility in workspace, either remote or our welcoming office. Bonuses for article writing, public talks, and other activities. Generous time off, including vacation, national holidays, sick leaves, and family days. Personalized learning programs tailored to your interests and skill development. Free tech webinars and meetups organized by Svitla. Regular corporate online activities. Awesome team and a friendly, supportive community!

🏢 Summary: Full-time Senior Full Stack Engineer role focused on building and maintaining scalable backend services with .NET and Java/Kotlin, and contributing to frontend development with Angular. The position involves designing secure APIs, driving UI architecture, and working within Agile teams to deliver commercial software products. Approximately 20–30% of the role is dedicated to frontend development. 🗂️ Requirements: 5+ years of commercial software development experience, Strong experience with .NET (C#) backend development, Strong experience with Java or Kotlin backend development, Hands-on experience with Kotlin in backend environments, Knowledge of Angular and TypeScript, Experience designing and working with RESTful APIs and SOAP APIs, Understanding of backend architecture, performance, security, scalability, Knowledge of Azure Cloud and application deployment, Familiarity with Azure DevOps and CI/CD processes, Experience with modern web development practices, Experience working in Agile/Scrum environments, Bachelor’s degree in Computer Science or equivalent experience, Strong English communication skills 📃 Skills: .NET, C#, Java, Kotlin, Angular, TypeScript, REST, SOAP, Azure, AzureDevOps, CI/CD 🏢 Description: Svitla Systems Inc. is looking for a Senior Full Stack Engineer with .NET, Java, and Angular for a full-time position (40 hours per week) in Europe. Our client is a leading global provider that gathers information and reports to enhance the environmental and social impacts on the business. A Senior Engineer must have strong backend expertise in .NET and Java/Kotlin, as well as frontend experience in Angular. Requirements: 5+ years of commercial experience in software development. Strong experience with .NET (C#) and Java/Kotlin backend development. Hands-on experience with Kotlin in backend environments. Knowledge of Angular and TypeScript. Understanding of designing and working with RESTful APIs and SOAP APIs. Solid understanding of backend architecture, including performance, security, and scalability. Knowledge of Azure Cloud, including deployment and scaling of applications. Familiarity with Azure DevOps and CI/CD processes. Strong understanding of modern web development practices. Experience working in Agile/Scrum environments. Strong communication skills in English. Bachelor’s degree in Computer Science or equivalent experience. Responsibilities: Work within an Agile team to design, estimate, develop, test, and deliver commercial software products. Develop and maintain backend services using .NET and Java/Kotlin. Design and implement secure, scalable RESTful APIs and services. Contribute to frontend development using Angular and TypeScript (~20–30%). Drive UI architecture and develop reusable UI components. Ensure best practices and design guidelines for UI and backend development. Write clean, maintainable, and efficient code for both client-side and server-side applications. Develop unit and integration tests; collaborate with QA to resolve issues. Collaborate with Product Owners and stakeholders to refine requirements and user stories. Contribute to project estimation, planning, timelines, and status updates. Provide technical guidance and mentorship where needed. We offer: US and EU projects based on advanced technologies. Competitive compensation based on skills and experience. Regular performance appraisals to support your growth. Flexibility in workspace, either remote or our welcoming office. Bonuses for article writing, public talks, and other activities. Generous time off, including vacation, national holidays, sick leaves, and family days. Personalized learning programs tailored to your interests and skill development. Free tech webinars and meetups organized by Svitla. Regular corporate online activities. Awesome team and a friendly, supportive community!

🏢 Summary: Full-time Senior Software Engineer (Node.js) role focused on designing and operating a high-performance API gateway and tracking infrastructure for a B2C ecommerce data platform. The position centers on building JavaScript event pipelines, developing Lua extensions for API7/Apache APISIX, and ensuring reliable, low-latency event ingestion across browser and server environments. The engineer will own pixel-based tracking systems and observability of the entire tracking stack. 🗂️ Requirements: 5+ years in backend or platform engineering, Strong production experience with JavaScript and Node.js, Experience designing and operating API gateways or edge layers, Lua development in NGINX/OpenResty/APISIX environments, Experience with high-volume low-latency event ingestion, Experience with pixel-based tracking systems, Strong understanding of HTTP browser internals cookies and CORS, Experience with AWS or GCP, Experience with Kubernetes, Fluent English 📃 Skills: JavaScript, Node.js, Lua, NGINX, OpenResty, APISIX, API7, AWS, GCP, Kubernetes, OpenTelemetry, Prometheus, Grafana, ELK, SumoLogic, HTTP, CORS, Cookies 🏢 Description: Svitla Systems Inc. is looking for a Senior Software Engineer (Node.js) for a full-time position (40 hours per week) in Europe . Our client is a software company providing a B2C ecommerce identity and marketing data platform. Role Overview: The team is seeking a Senior Software Engineer to own and evolve our API gateway and tracking layer, with a strong focus on JavaScript-based event pipelines, pixel technologies, and Lua-powered gateway extensions using API7 / Apache APISIX. This role is critical to ensuring accurate, low-latency site tracking, reliable event ingestion, and high-fidelity telemetry across browser, server, and API boundaries. Occasional travel to Vienna is a must-have option. Requirements: 5+ years of experience in platform, backend, or tracking-focused engineering roles. Strong experience with JavaScript / Node.js in production systems. Proven experience designing/operating an API gateway or edge layer (core responsibility, not incidental). Lua development in NGINX / OpenResty / APISIX-style environments (plugins/middleware). Experience with high-volume, low-latency event ingestion and/or request routing. Experience designing and operating pixel-based tracking systems. Solid understanding of browser internals, HTTP, cookies, CORS, and security. Familiarity with cloud-native infrastructure (AWS/GCP, Kubernetes). Excellent spoken and written English. Nice to have: Experience with CDPs, analytics platforms, or attribution systems. Server-side tagging or GTM Server-Side experience. Knowledge of privacy frameworks (consent, first-party data strategies). OpenTelemetry or real-time streaming pipelines. Responsibilities: Design and operate an API7 / Apache APISIX gateway layer for high-volume tracking and event ingestion. Develop custom Lua plugins to: Capture, normalize, and enrich pixel and API events; Perform edge-side validation, filtering, and routing. Build and maintain JavaScript / Node.js services that: Receive and process tracking events; Support pixel endpoints, event batching, and retries; Interface with downstream analytics and data platforms. Instrument tracking pipelines with observability tooling (OpenTelemetry, Prometheus, Grafana, ELK, SumoLogic). Ensure compliance and reliability across tracking infrastructure (latency, completeness, uptime). Partner with product, data, and privacy teams to evolve tracking strategies. Participate in on-call rotations, incident response, and postmortems. Implement and maintain pixel-based tracking systems, including: First-party and third-party pixel architectures; Cookie and localStorage handling; Browser-to-server event flows. We offer: US and EU projects based on advanced technologies. Competitive compensation based on skills and experience. Regular performance appraisals to support your growth. Flexibility in workspace, either remote or our welcoming office. Bonuses for article writing, public talks, and other activities. Generous time off, including vacation, national holidays, sick leaves, and family days. Personalized learning programs tailored to your interests and skill development. Free tech webinars and meetups organized by Svitla. Regular corporate online activities. Awesome team and a friendly, supportive community!

🏢 Summary: Full-time Senior Full Stack Engineer role focused on building and enhancing a SaaS marketplace platform hosted on AWS, using React and JavaScript technologies. The position involves developing complex back-end logic and contributing to a global engineering team. The role requires overlap with CET working hours and emphasizes high-quality, test-driven development. 🗂️ Requirements: 6+ years of full-stack development experience, 4+ years of experience with Node.js and/or Python, 4+ years of experience with React, Strong knowledge of JavaScript and TypeScript, Experience with ES6, Ability to write standards-compliant HTML and CSS, Experience with Test Driven Development, Familiarity with Git, Knowledge of Linux or Unix-based systems, Experience with RESTful web services 📃 Skills: React, JavaScript, TypeScript, Node.js, Python, HTML, CSS, TDD, Git, Linux, Unix, REST, AWS, ES6 🏢 Description: Svitla Systems Inc. is looking for a Senior Full Stack Engineer with React and JavaScript for a full-time position (40 hours per week) in Europe. Our client is a leading on-site work marketplace seeking creative and skilled developers to join the global engineering team. The mission is to design and develop technology that improves users' lives while providing an exceptionally high level of service. The cutting-edge technology SaaS solution hosted on AWS that enables today's and tomorrow’s Gig economy. Overlap till 7 pm CET. Requirements: 6+ years of experience in full-stack development. 4+ years of experience with Node.js and/or Python, React. Strong knowledge of JavaScript/TypeScript, ES6, and React. Understanding of writing clean, standards-compliant HTML and CSS. Strong focus and experience in Test Driven Development. Familiarity with the Git version control system. Knowledge of Linux or other Unix-based systems (Ubuntu/Debian is a plus). Understanding of web services-based solutions (REST specifically). Strong written and verbal communication skills. Ability to work well with others as part of a team and across teams. Ability to break down more significant initiatives into manageable pieces. Upper-intermediate level of English. Nice to have: Experience with Preprocessor (LESS/Sass). Experience working with offshore teams. Experience with React-native. Responsibilities: Participate in developing a feature connected with complex back-end logic for the client-worker part. Take part in team meetings, including daily stand-ups and backlog refinement sessions. Provide code refactoring when needed. We offer: US and EU projects based on advanced technologies. Competitive compensation based on skills and experience. Regular performance appraisals to support your growth. Flexibility in workspace, either remote or our welcoming office. Bonuses for article writing, public talks, and other activities. Generous time off, including vacation, national holidays, sick leaves, and family days. Personalized learning programs tailored to your interests and skill development. Free tech webinars and meetups organized by Svitla. Regular corporate online activities. Awesome team and a friendly, supportive community!

🏢 Summary: Full-time Senior Full Stack Engineer role building and scaling a high-throughput cloud platform for call tracking, marketing attribution, real-time analysis, and AI-driven workflows. The position involves hands-on development across backend and frontend systems, contributing to architecture, integrations, and production stability in a fast-moving startup environment. The engineer will work closely with founders to deliver scalable, reliable features with strong ownership and minimal oversight. 🗂️ Requirements: Senior-level full stack engineering experience in production environments, Strong backend development experience with Node.js, Strong frontend development experience with React or similar frameworks, Experience designing and maintaining complex web applications and APIs, Experience with relational databases and production data models, Knowledge of PostgreSQL or similar relational databases, Understanding of REST APIs and distributed system design, Experience integrating third-party APIs and external systems, Ability to debug and troubleshoot production systems, Experience balancing scalability, performance, and maintainability 📃 Skills: Node.js, React, JavaScript, PostgreSQL, SQL, REST, APIs, Redis, Python, HTML, CSS, Git, Cloud, AI 🏢 Description: Svitla Systems Inc. is looking for a Senior Full Stack Engineer for a full-time position (40 hours per week) in Europe. Our client is building an advanced cloud platform for call tracking, marketing attribution, real-time call analysis, and intelligent workflow automation in the pay-per-call and lead generation space. The company is in a hypergrowth phase and is actively scaling both its product platform and engineering capability. The platform combines high-throughput infrastructure, deterministic backend systems, real-time integrations, and AI-driven functionality to support transcription, summarization, extraction, scoring, and increasingly sophisticated agent-enabled workflows. You'll operate with a high degree of independence and make meaningful contributions across both backend and frontend systems. It is a hands-on senior engineering role for someone comfortable working directly with founders, shipping quickly, solving difficult production problems, and contributing to architectural and implementation decisions in a fast-moving startup environment. This role is best suited to an engineer with strong technical depth, sound judgment, product awareness, and the ability to move quickly without creating unnecessary technical debt. The right candidate will not need a heavy process, extensive oversight, or narrow task-by-task direction. This person should be able to step into an evolving system, understand the broader technical and business context, and deliver high-quality work in a practical, efficient way. The engineer will work closely with the founders and the rest of the engineering team, contributing directly to core product and platform development. The client has made it clear that they value engineers based on their performance in a real working environment, not on artificial interview exercises or theoretical problem-solving detached from production realities. Requirements: Strong experience as a Senior Full Stack Engineer, with clear ownership of both backend and frontend production systems. Solid experience in backend engineering with Node.js in real-world production environments. Expertise in frontend engineering with React or similar modern JavaScript frontend frameworks. Understanding of design, build, and maintain complex web applications and APIs that support meaningful business workflows. Strong experience working with relational databases, application data models, and production data access patterns. Knowledge of PostgreSQL or similar relational database technologies in production systems. In-depth understanding of REST APIs, asynchronous workflows, distributed integration patterns, and service-based application design. Experience integrating with third-party APIs and external systems in production environments. Ability to work effectively in evolving codebases and make good engineering decisions without requiring excessive structure or hand-holding. Expertise in debugging and troubleshooting across application logic, integrations, and production issues. Ability to balance delivery speed with long-term maintainability in a startup or high-growth environment. Nice to have: Experience working in startup or hypergrowth environments where engineers are expected to take ownership and move quickly. Familiarity with Redis, caching strategies, job processing, or event-driven application behavior. Exposure to Python and collaboration with AI or data-oriented systems. Experience building or supporting systems with high throughput, near-real-time workflows, or operationally sensitive business logic. Background in AdTech, MarTech, call tracking, attribution platforms, lead generation systems, or analytics-heavy products. Experience building internal operational tooling and admin workflows for technical or business users. Exposure to cloud-native environments and scalable distributed systems. Experience collaborating closely with technical founders, product leadership, or senior engineering stakeholders. Responsibilities: Design, build, and maintain production-grade application features across both backend and frontend systems, with strong attention to scalability, performance, reliability, and maintainability. Develop backend services and APIs using Node.js to support platform capabilities such as workflow orchestration, system integrations, feature logic, internal tooling, and real-time operational processing. Build and enhance frontend applications using React or similar modern frontend technologies to support dashboards, management interfaces, internal tools, and user-facing platform capabilities. Take ownership of significant technical areas and deliver solutions with minimal day-to-day oversight, while collaborating closely with founders and other senior engineers. Work on systems that support high-volume workflows, external integrations, and operationally important product capabilities where responsiveness and reliability matter. Implement and maintain integrations with external partner platforms, APIs, and data-driven systems, including CRM platforms, call-tracking systems, and other third-party services that are central to the product ecosystem. Contribute to architectural discussions and technical decisions related to application structure, data flow, performance optimization, maintainability, and production stability. Investigate and resolve production bottlenecks, system issues, and integration challenges in a practical, efficient manner. Collaborate with AI and data engineering team members where needed to connect backend and frontend product capabilities with intelligent workflows such as transcription, data extraction, scoring, or analytics-driven features. Help establish sound engineering patterns and raise the quality bar as the team scales, including code quality, implementation discipline, and pragmatic technical decision-making. Participate in a fast-moving engineering culture where new features, experiments, and improvements are shipped continuously. We offer: US and EU projects based on advanced technologies. Competitive compensation based on skills and experience. Regular performance appraisals to support your growth. Flexibility in workspace, either remote or our welcoming office. Bonuses for article writing, public talks, and other activities. Generous time off, including vacation, national holidays, sick leaves, and family days. Personalized learning programs tailored to your interests and skill development. Free tech webinars and meetups organized by Svitla. Regular corporate online activities. Awesome team and a friendly, supportive community!

🏢 Summary: Full-time Senior Front-End Engineer (ExtJS) role focused on developing and maintaining a SaaS application in an Agile/Scrum environment. The position involves technical design, implementation, refactoring, and unit testing of front-end features, with a strong emphasis on Ext JS expertise. The role also includes contributing to architectural decisions and mentoring other engineers. 🗂️ Requirements: Strong knowledge of Ext JS (version 7 or minimum 5 years of experience), Experience in front-end web development, Proficiency in using an IDE (preferably PhpStorm), Knowledge of software design patterns, Understanding of software development best practices, Ability to work in Scrum/Agile environment, Experience with code analysis and refactoring, Ability to design, build, and unit test features 📃 Skills: ExtJS, JavaScript, HTML, CSS, PhpStorm, SaaS, Scrum, Agile, IDE, UnitTesting, Refactoring 🏢 Description: Svitla Systems Inc. is looking for a Senior Front-End Engineer (ExtJS) for a full-time position (40 hours per week) in Poland . Our client is a leading global provider that involves gathering information and reporting to enhance the environmental and social impacts on the business. Requirements Strong knowledge of Ext JS (version 7 or at least 5 years of experience). Understanding of web development using an IDE (ideally PhpStorm). Familiarity with current trends in software development. Knowledge of software design patterns and best practices. Nice to have Experience optimizing applications for performance. Experience in SaaS product development. Understanding of Scrum/Agile methodologies. Responsibilities Take part in Scrum/Agile-based development of a SaaS Application. Provide technical design, build, and unit testing for new features. Conduct analysis and refactoring of existing source code. Analyze requirements, suggest concepts, and assess development efforts. Establish yourself as a Subject Matter Expert. Mentor other engineers. We offer US and EU projects based on advanced technologies. Competitive compensation based on skills and experience. Regular performance appraisals to support your growth. Flexibility in workspace, either remote or our welcoming office. Bonuses for article writing, public talks, and other activities. Generous time off, including vacation, national holidays, sick leaves, and family days. Personalized learning programs tailored to your interests and skill development. Free tech webinars and meetups organized by Svitla. Regular corporate online activities. Awesome team and a friendly, supportive community!

🏢 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 distributed backend systems for digital advertising and identity management. The position involves full lifecycle development, automated testing, monitoring, and performance optimization using Node.js and related technologies. The role is almost fully remote with occasional office presence in Krakow or Warsaw. 🗂️ Requirements: Higher education in Computer Science or related field, Minimum 5 years of programming experience, At least 5 years of commercial experience with Node.js, Strong knowledge of Node.js and TypeScript, Experience with NestJS or Fastify frameworks, Experience with MongoDB and Redis, Experience with AWS and S3, Experience in application design and performance optimization, Experience in building automated tests and monitoring solutions, Knowledge of event-driven architecture and design patterns, Proficiency with Git and GitHub, Good command of technical English 📃 Skills: Node.js, TypeScript, NestJS, Fastify, MongoDB, Redis, AWS, S3, JavaScript, Git, GitHub, Babel 🏢 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: Full-time Senior Java Developer role for a long-term media industry project, focused on backend development, microservices architecture, cloud technologies, and DevOps practices. The position offers flexible remote or hybrid work in Poland and involves development, code reviews, technical consulting, and documentation within a Scrum team. 🗂️ Requirements: 4+ years of Java 8–25 development experience, Knowledge of design patterns, multithreading, and immutability, Experience with Spring Boot, Spring MVC, WebFlux, MyBatis, and TestContainers, Experience with SQL and NoSQL databases, Knowledge of microservices, REST, Kubernetes, Docker, SOA, and SSO, Experience with JUnit, Mockito, Spock, JMeter, and K6, Experience with Git, Jenkins, GitLab CI, and GitLab Pipelines, Understanding of OWASP and web application security principles, Experience working in Scrum teams, Knowledge of Unix/Linux systems, Experience with Python and Bash scripting, Understanding of AWS services including IAM, EC2, S3, Lambda, API Gateway, CloudWatch, and MSK, Experience creating technical and user documentation, Knowledge of DevOps practices and automation tools, Advanced English communication skills 📃 Skills: Java, Spring, SpringBoot, SpringMVC, WebFlux, MyBatis, TestContainers, Oracle, PostgreSQL, MongoDB, Redis, Kafka, ORM, Microservices, REST, Kubernetes, Docker, SOA, SSO, Okta, CAS, IAM, JUnit, Mockito, Spock, JMeter, K6, Git, Bitbucket, GitLab, Jenkins, CI/CD, OWASP, Scrum, Confluence, Jira, Linux, Unix, Python, Bash, AWS, EC2, S3, Lambda, APIGateway, CloudWatch, MSK, HTML, CSS, JavaScript, Angular, React, Vue.js 🏢 Description: Svitla Systems Inc. is looking for a Senior Java Developer for a full-time position (40 hours per week) in Poland. Our client is a French-based international group of media companies. It is a long-term project. There are optional night-time deployment sessions every other Wednesday at 10:00 PM. Our working hours are 8 hours and 30 minutes from Monday to Thursday, and 6 hours on Fridays, with the option to work 8 hours from Monday to Friday. You can choose to work remotely or from the office. While remote work is welcome, attendance at the Warsaw office is encouraged 1 to 3 times a week. REQUIREMENTS Minimum of 4 years of development experience using Java 8–25. Strong knowledge of design patterns, multithreading and immutability. Knowledge of such frameworks as Spring (Spring Boot, Spring MVC, WebFlux), MyBatis, TestContainers. Experience with SQL and NoSQL (Oracle, PostgreSQL, MongoDB, Redis), Confluence, Kafka, and the ability to work with ORM (Object-Relational Mapping). Understanding of software architecture, including microservices, RESTful architecture, Kubernetes, Docker, SOA (Service-Oriented Architecture), and SSO (Okta, CAS, IAM). Experience with testing tools: Unit testing (JUnit, Mockito), integration and acceptance testing (Spock), support for performance testing (JMeter, K6). Familiarity with version control and CI/CD tools: Git (Bitbucket, GitLab), Jenkins, GitLab CI, and GitLab Pipelines. High degree of independence, accountability for results and attention to the quality of implementation. Understanding of the basic principles of web application security (e.g. OWASP). Ability to collaborate within a Scrum development team. Familiarity with Confluence and Jira. Knowledge of Unix/Linux systems. Knowledge of scripting languages in a Linux environment (Python, Bash). Understanding of AWS cloud services and technologies, including IAM, EC2, S3, Lambda, API Gateway, CloudWatch, and MSK. Expertise in creating technical and user documentation Knowledge of DevOps practices and automation tools. Analytical and problem-solving skills with the ability to analyze requirements and design solutions. High level of English for communication. NICE TO HAVE Knowledge of front-end tools and technologies HTML, CSS, JavaScript (frameworks such as Angular, React or Vue.js). RESPONSIBILITIES Deliver development work. Provide technical consultations (advising other individuals and departments). Perform code reviews and foster team development. Create documentation in Confluence, managing tasks using Jira. WE OFFER US and EU projects based on advanced technologies. Competitive compensation based on skills and experience. Regular performance appraisals to support your growth. Flexibility in the workspace, either remote or in our welcoming office. Comprehensive medical insurance after one month. MultiSport card with access to 2500 sports facilities all over Poland Bonuses for recommendations of new employees. Bonuses for article writing, public talks, and other activities. 15 vacation days, 10 national holidays, 10 sick leaves, and family days off. Personalized learning program tailored to your interests and skill development. Free tech webinars and meetups organized by Svitla. Welcome and anniversary presents, gifts for children, and more. Regular corporate events and meetups. Awesome team, friendly and supportive community!