Senior Back-End Engineer (Node.js)

🏢 Summary: Senior Backend Developer role focused on designing and delivering scalable server-side applications and APIs using Python and Django for early-stage B2B SaaS products. The position involves architectural ownership, system reliability, and performance optimization in a fully remote, full-time setup. The developer will drive backend best practices, testing, and CI/CD processes. 🗂️ Requirements: 5+ years of backend development experience, Extensive experience with Python, Extensive experience with Django, Proficiency in data modelling, Experience with relational databases, Experience with non-relational databases, Ability to write complex SQL queries, Experience with API design, Experience with system integrations, Experience with distributed systems (synchronous and asynchronous), Hands-on experience with Docker, Hands-on experience with Redis, Experience with message brokers, Experience with cron jobs, Experience writing unit tests (e.g. Pytest), Strong understanding of code quality and testing best practices, Good command of English for technical communication 📃 Skills: Python, Django, SQL, Docker, Redis, Pytest, APIs, Databases, PostgreSQL, MongoDB, CI/CD, MessageBroker, Cron, Git 🏢 Description: Senior Backend Developer (Python/Django; 100% remote) 💰 Salary: 23,400-25,500 PLN/month 🌎 100% Remote 🕦 Full-time position ☑️ B2B or Contract of Employment We are looking for a Senior Backend Developer for a partner client with a compelling mission: they act as a product and technology partner for early-stage B2B SaaS founders, helping them navigate the crucial journey from launch to their first million in revenue. They essentially become the dedicated tech backbone for these startups. Requirements: 5+ years of professional backend development experience. Extensive, proven experience with Python and the Django framework. Proficient in data modelling, relational and non-relational databases, and complex SQL queries. Strong experience with API design, integrations, and distributed systems (synchronous & asynchronous communication). Hands-on experience with Docker, Redis, message brokers, and cron jobs. Expertise in writing unit tests (e.g., Pytest) and a commitment to code quality and testing best practices. Great understanding of English with strong communication and collaboration skills. Nice to have: Previous experience in Greentech or Ecotech is a significant plus. Experience as an unofficial tech lead or mentoring junior developers. Knowledge of additional testing methodologies (integration, end-to-end). Responsibilities: Lead the design and development of complex server-side applications, APIs, and databases, taking ownership of architectural decisions. Architect, write, and deliver high-quality, scalable, and efficient code using Python and Django. Collaborate closely with cross-functional teams, including front-end developers and the tech lead, to align backend development with project goals. Architect and implement advanced user authentication, authorisation, and security mechanisms. Conduct performance analysis and optimisation, identifying bottlenecks and implementing solutions. Drive the implementation of automated testing and CI/CD processes to ensure code reliability. Establish and enforce coding standards, conduct thorough code reviews, and document backend architecture and APIs. Take responsibility for system reliability, scalability, and security, ensuring 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: 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: Full-time, 100% remote Senior Frontend Developer role focused on building and scaling complex, responsive web applications powered by AI-driven platforms. The position involves architecting high-quality front-end solutions, integrating with back-end services, and ensuring performance, scalability, and cross-browser compatibility. The role also includes driving best practices, code quality, and modern front-end standards within the team. 🗂️ Requirements: Strong knowledge of HTML5, CSS3, JavaScript (ES6), Strong understanding of DOM, Experience with React.js, Experience with Material UI, Experience with Responsive Design and cross-browser compatibility, Familiarity with SASS or LESS, Understanding of BEM methodology, Knowledge of CSS-in-JS, Knowledge of browser storage (cookies, localStorage, sessionStorage), Proficiency with npm or yarn, Experience with Jest or equivalent testing frameworks, Understanding of SEO best practices, Familiarity with TypeScript, Knowledge of SSR and service workers, Experience with Webpack, Vite, or Rollup, Understanding of browser extensions integration 📃 Skills: HTML5, CSS3, JavaScript, ES6, DOM, React, MaterialUI, SASS, LESS, BEM, CSS-in-JS, cookies, localStorage, sessionStorage, npm, yarn, Jest, TypeScript, SSR, Webpack, Vite, Rollup, SEO, ServiceWorkers 🏢 Description: Senior Frontend Developer (100% remote) 💰 Salary: 20,000-23,000 PLN/month 🌎 100% Remote 🕦 Full-time position ☑️ B2B or Contract of Employment We are looking for a Senior Frontend Developer for a partner client that helps businesses use artificial intelligence to run more efficiently and grow faster. The company builds and provides digital platforms and consulting services that enable organizations to manage operations, analyze data, and improve performance. Their solutions combine AI, automation, and deep business expertise to help clients simplify workflows, gain insights, and deliver greater value. Requirements: HTML5 , CSS3 , JavaScript (ES6) Strong understanding of the Document Object Model (DOM) Skilled in Responsive Design and cross-browser compatibility Experience with React.js and Material UI Familiarity with CSS preprocessors such as SASS or LESS Understanding of BEM methodology and CSS-in-JS approaches Knowledge of browser storage mechanisms (cookies, localStorage, sessionStorage) Proficient in using package managers (npm/yarn) Experience in unit testing using Jest or equivalent frameworks Understanding of SEO best practices Familiarity with TypeScript for type-safe, large-scale applications Knowledge of server-side rendering (SSR) and service workers Experience with code bundling and modern module bundlers (e.g., Webpack, Vite, Rollup) Understanding of browser extensions and their integration with web applications Responsibilities: Develop and maintain  complex, responsive user interfaces for large-scale web applications. Architect and integrate front-end components with back-end APIs and services , ensuring security, scalability, and performance. Drive the implementation of pixel-perfect UI/UX designs across browsers and devices. Provide technical mentorship to junior developers and guide the team in adopting modern best practices. Conduct code reviews , enforce standards, and maintain a clean, modular codebase. Evaluate and recommend new frameworks, tools, and libraries to enhance productivity. Manage project timelines, estimate development efforts, and collaborate effectively with cross-functional teams. Maintain comprehensive front-end documentation , design patterns, and style guides. Stay updated with industry trends , emerging technologies, and front-end innovations to continuously improve team capabilities. Participate in architectural discussions , ensuring long-term scalability and maintainability of the front-end ecosystem. 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 Backend Developer role focused on designing and implementing core components of a high-performance trading platform in a cloud-native, microservices environment. The position involves building low-latency order management and event-driven distributed systems using Java/Kotlin on AWS. You will work within a Scrum team to deliver secure, scalable backend services for financial infrastructure. 🗂️ Requirements: Bachelor’s degree in Computer Science, IT or equivalent experience, 6+ years of experience in Java or Kotlin, Experience with Docker and Kubernetes, Strong knowledge of AWS cloud platform, Experience with CI/CD pipelines and automation, Knowledge of microservices architecture, Experience working with distributed systems, Competence in messaging systems, Experience with distributed caching, Understanding of monitoring and observability tools, English proficiency minimum B2 📃 Skills: Java, Kotlin, Kubernetes, Docker, Jenkins, GitLab, AWS, Microservices, CI/CD, Messaging, Caching, Scrum 🏢 Description: Employer: Swiss IT Company in Banking Infrastructure Rate: 6000 - 7500 Eur net per month Cooperation model: B2B Start date: ASAP Recruitment process:  3 steps (pre - screening, technical interview, technical task) Technology stack: Java or Kotlin, Kubernetes, Docker, Jenkins, Gitlab, AI Tools, AWS Team: 20-person Scrum team responsible for separate microservices We are currently looking for a Senior Backend Developer based in Poland (preferred locations: Wrocław, Poznań or fully remote). In this role, you will contribute to the design and implementation of strategic backend components within a high-performance financial technology platform. You will work on infrastructure responsible for order management, execution logic, smart routing mechanisms, and event-driven business services in a cloud-native environment. This is an opportunity to join a fast-growing, product-driven fintech organisation operating in a technically demanding domain with strong market demand and long-term growth potential. Your role is: -> Designing and implementing new releases of a core trading platform -> Contributing to architecture decisions around: low-latency order management execution algorithm smart order routing event driven and distributed systems -> Engineering and operating distributed services in cloud environments -> Collaborating closely with Product, Engineering Leadership, and cross-functional teams -> Ensuring solutions follow current industry best practices and architectural standards -> Designing with security, authentication and authorization in mind Your skills and experiences: -> Bachelor’s degree in Computer Science, IT or equivalent practical experience -> Experience with container orchestration (Docker and Kubernetes) -> 6+ years of experience in Java and/or Kotlin -> Solid understanding of monitoring, observability and diagnostics tooling -> Strong knowledge of cloud platform AWS -> Experience with CI/CD pipelines and automation -> Knowledge of microservices architecture and the ability to work within a distributed system environment -> Proven competence in messaging systems and distributed caching -> Strong spoken and written English (min B2) Nice to have: + Experience with reactive programming patterns + Strong clean-code mindset and experience with test automation Our client offers: + Great opportunity for personal development in a stable and friendly large multinational company + Frequent company events + Flexible working hours If interested, please apply safely through this portal (application rules are in accordance with GDPR). Employment agency Nr 17138.

🏢 Summary: Remote Senior Backend Node.js Developer role focused on building and scaling an event-driven microservices trading platform. The position involves end-to-end development, collaborating across product, QA, and DevOps to deliver high-performance, scalable trading solutions. B2B contract with overlap required with NYC working hours. 🗂️ Requirements: Bachelor’s Degree in Computer Science or related field, 3-5 years professional web application development experience, Expert-level Node.js knowledge, Expert-level TypeScript knowledge, Experience with distributed systems, Experience with Apache Kafka, Redis, Kubernetes, MongoDB, Experience with automated unit testing and TDD, Strong understanding of performance optimization and computational complexity, Knowledge of algorithms and design patterns, Fluent English (written and spoken) 📃 Skills: Node.js, TypeScript, Kafka, Redis, Kubernetes, MongoDB, Microservices, TDD, Algorithms, DesignPatterns, Web, DistributedSystems 🏢 Description: We are looking for a performance-driven backend Senior Node.js Developer who can help us bring our client's trading solutions to the next level of functionality, scalability, and user experience. They are actively developing a new event-driven microservices architecture to form a foundational platform for delivering new trading applications. You will be responsible for delivering software end-to-end , from liaising with product managers and designers, to coordinating across international development teams on engineering and architecture to working with QA and DevOps teams - all ultimately to deliver a quality, innovative product to the traders and investors who depend on the platform every day. Requirements: Fluent English language [both written and spoken] Education: at least Bachelor's Degree, preferably in Computer Science 3-5 years' professional web application development experience Expert-level Node.js and TypeScript knowledge, and curiosity to learn more Broad knowledge of web platform and technologies Superior analytical and problem-solving ability Effective communication skills to work with different teams across an international company Experience with modern distributed systems and infrastructure technologies, including Apache Kafka, Redis, Kubernetes, and MongoDB Automated unit testing and test-driven development Robust understanding of performance issues, computational complexity, and code optimization. Familiarity and implementation of industry-standard algorithms and design patterns Proactive and team player who can deliver in a high-pressure demanding environment Nest.js – nice to have Offer details: 100% remote job preferrably at least 4-5 hours overlap with NYC working hours B2B contract rate up to 50 USD/h net Don't hesitate and apply now!

🏢 Summary: Senior Node.js Developer role focused on building and scaling the backend API layer of an IoT platform for monitoring and optimizing energy usage in buildings. The position involves developing distributed backend systems using TypeScript, Node.js, and Kubernetes, and integrating with IoT devices and analytics modules. The role requires delivering high‑performance, scalable solutions in a cloud-based environment. 🗂️ Requirements: Minimum 5 years of commercial backend development experience, Strong knowledge of Node.js, Strong knowledge of TypeScript, Understanding of distributed systems, Experience with scalable backend design, Experience with containerized or cloud environments, Experience with Kubernetes, Ability to work in Agile environment, Fluency in English, Residing in Poland 📃 Skills: Node.js, TypeScript, Kubernetes, IoT, APIs, Backend, Cloud, DistributedSystems, Agile 🏢 Description: We are looking for a Senior Node.js Developer to join a project for a leading global energy‑tech company. You will help build an intelligent platform used to monitor and optimize energy usage in buildings. The work combines backend development, IoT integration, and modern cloud technologies. Your tasks Develop backend applications that provide the API layer of the IoT platform using TypeScript and Node.js Build and maintain backend services supporting mobile and web solutions Use Node.js, TypeScript, and Kubernetes to deliver reliable and scalable systems Integrate backend features with IoT devices, analytics modules, and other platform components Ensure high performance, clean architecture, and smooth cooperation with other teams Requirements Minimum 5 years of commercial experience in backend development Strong knowledge of Node.js and TypeScript Understanding of distributed systems and scalable backend design Experience with containerized or cloud‑based environments (e.g., Kubernetes) Ability to work in an Agile environment and deliver high‑quality code Fluency in English Residing in Poland required

🏢 Summary: Fully remote Senior Node.js Backend Engineer role focused on building and scaling cloud-native microservices in a serverless AWS environment. The position involves designing high-performance REST APIs, provisioning infrastructure with Terraform, and optimizing distributed systems for scalability and resilience. You will contribute to CI/CD pipelines and ensure robust, production-grade backend services. 🗂️ Requirements: 4+ years of professional experience in Node.js server-side development, 2+ years of experience in system and data integration, transformation, and validation, Strong experience designing and deploying REST APIs, Hands-on experience with Terraform for AWS infrastructure provisioning, Practical experience with AWS services: Lambda, SQS, CloudWatch, S3, Deep understanding of distributed systems, scalability, and failure handling, Experience with CI/CD pipelines and GitHub Actions, Proficiency with shell scripting and Linux command-line tools 📃 Skills: Node.js, AWS, Lambda, SQS, CloudWatch, S3, Terraform, REST, CICD, GitHubActions, Shell, Linux, DistributedSystems, DynamoDB, DocumentDB, Streaming 🏢 Description: Ignite innovation at the forefront of cloud-native backend development — shape scalable microservices for dynamic digital ecosystems. Fully-remote opportunity! As a Senior Node.js Backend Engineer , you will be working for our client, a leading technology-driven organization dedicated to building resilient distributed systems that power tomorrow's digital experiences. You will contribute to designing and implementing high-performance microservices on AWS, enhancing system robustness, scalability, and flexibility. Join us and be part of pioneering solutions that redefine industry standards and accelerate your career growth. Your main responsibilities: Develop and maintain REST-like APIs and backend services using Node.js in a serverless AWS environment Design, implement, and optimize infrastructure-as-code configurations with Terraform for AWS services such as Lambda, SQS, CloudWatch, and S3 Integrate complex data streams, transform, validate, and analyze data within distributed systems Collaborate with cross-functional teams to ensure system robustness, scalability, and failure resilience Contribute to CI/CD pipelines utilizing GitHub Actions, and enforce best practices in version control Troubleshoot and resolve operational issues within AWS infrastructure and backend services Maintain comprehensive documentation and ensure high-quality code standards You're ideal for this role if you have: At least 4 years of professional experience in Node.js server-side development 2+ years of experience in system/data integration, transformation, and validation Deep understanding of distributed systems, including scalability, elasticity, replication, and failure handling Strong experience designing and deploying REST-like APIs Hands-on experience with Terraform for AWS infrastructure provisioning Practical knowledge of serverless AWS services: Lambda, SQS, CloudWatch, S3 Solid grasp of GitHub tool suite, CICD pipelines, and shell scripting Good command of Linux command line tools Excellent communication skills in English Problem-solving mentality with a focus on business impact It is a strong plus if you have: Experience with DynamoDB, DocumentDB, and Streaming services Language Required for the role: Fluent English Eligibility for the role: Only candidates with an existing legal right to work in the European Union will be considered for this role. We offer you At ITDS , you will work on innovative and impactful technology projects for international companies across multiple industries in Europe and beyond. We create an environment for ambitious, driven professionals who want to grow, deliver value, and build their careers in modern IT and digital transformation. Our offer includes: Stable and long-term cooperation with attractive conditions Opportunities to develop your technical expertise across various industries and technologies The chance to work on high-impact, strategic IT and digital transformation projects A clear career path and the opportunity to grow quickly by contributing to diverse client initiatives over time International environment , knowledge sharing, social events, and training opportunities Access to an attractive medical package Access to the Multisport program Access to learning platforms such as Pluralsight Flexible working hours and remote work options #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. # 8942

🏢 Summary: Senior Backend Node.js Developer role focused on building and scaling an event-driven microservices trading platform. The position involves end-to-end development within a distributed architecture, ensuring high performance, scalability, and code quality. Fully remote B2B contract with overlap with NYC hours. 🗂️ Requirements: 4+ years web application development experience, Expert knowledge of Node.js, Expert knowledge of TypeScript, Experience with distributed systems architecture, Experience with Apache Kafka, Experience with Redis, Experience with Kubernetes, Experience with MongoDB, Experience with automated unit testing and TDD, Strong understanding of performance optimization and computational complexity, Knowledge of algorithms and design patterns, Broad knowledge of web technologies 📃 Skills: Node.js, TypeScript, Kafka, Redis, Kubernetes, MongoDB, Microservices, TDD, Algorithms, DesignPatterns, Web 🏢 Description: We are looking for a performance-driven backend Senior Node.js Developer who can help us bring our client's trading solutions to the next level of functionality, scalability, and user experience. They are actively developing a new event-driven microservices architecture to form a foundational platform for delivering new trading applications. You will be responsible for delivering software end-to-end , from liaising with product managers and designers, to coordinating across international development teams on engineering and architecture to working with QA and DevOps teams - all ultimately to deliver a quality, innovative product to the traders and investors who depend on the platform every day. Requirements: Fluent English language [both written and spoken] Education: at least Bachelor's Degree, preferably in Computer Science 4+ years' professional web application development experience Expert-level Node.js and TypeScript knowledge, and curiosity to learn more Broad knowledge of web platform and technologies Superior analytical and problem-solving ability Effective communication skills to work with different teams across an international company Experience with modern distributed systems and infrastructure technologies, including Apache Kafka, Redis, Kubernetes, and MongoDB Automated unit testing and test-driven development Robust understanding of performance issues, computational complexity, and code optimization. Familiarity and implementation of industry-standard algorithms and design patterns Proactive and team player who can deliver in a high-pressure demanding environment Nest.js – nice to have Offer details: 100% remote job preferrably at least 4-5 hours overlap with NYC working hours B2B contract rate up to 55 USD/h net

🏢 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: Senior Backend Engineer role focused on designing and delivering scalable, production-ready software using Node.js and AWS. The position involves leading development of complex solutions, ensuring high performance, reliability, and security, and integrating monitoring and testing practices. The engineer collaborates in agile teams to translate product requirements into resilient cloud-based applications. 🗂️ Requirements: Strong experience with Node.js and TypeScript, Proficiency with AWS services (Lambda, SNS/SQS, API Gateway, CDK), Experience with TDD and QA best practices, Ability to design and build highly scalable applications, Experience with monitoring, performance, scalability, and security, Experience conducting code reviews and delivering production-ready code, Ability to integrate monitoring and support tools, Experience contributing to test frameworks 📃 Skills: Node.js, TypeScript, AWS, Lambda, SNS, SQS, API Gateway, CDK, TDD, QA, Monitoring, Scalability, Security, Agile 🏢 Description: We are looking for a Senior Backend Engineer (Node.js / AWS) who: Has strong experience with TDD and solid understanding of QA best practices. Can handle operational challenges : monitoring, performance, scalability, availability, resilience, and security. Translates product requirements into reliable, scalable software . Has excellent development skills and experience building highly scalable applications . Is proficient in Node.js, TypeScript , and AWS services like Lambda, SNS/SQS, API Gateway , and CDK . What you’ll do: Lead development of complex software solutions. Conduct code reviews and deliver production-ready code . Integrate software with monitoring/support tools . Collaborate with architects and technical leads, participate in agile processes . Contribute to test frameworks , troubleshoot issues, and ensure smooth team collaboration.