Senior Backend Developer (C# or Node.js)

🏢 Summary: Senior Quality Engineer role focused on automated testing and quality assurance for backend and IoT solutions in cloud-based, microservices environments. The position involves backend validation, API and integration testing, and ensuring data consistency across distributed systems. Work includes collaboration within Agile teams and support of CI/CD-driven, containerized platforms. 🗂️ Requirements: Strong programming skills in C# or Node.js/JavaScript, Experience in backend testing and automated test development, Knowledge of microservices architecture, Practical experience testing REST APIs and backend integrations, Hands-on experience with Azure cloud environments, Experience with MSSQL and MongoDB databases, Familiarity with Docker, RabbitMQ, and Redis, Understanding of CI/CD pipelines and tools, Experience working in Agile/Scrum teams 📃 Skills: C#, .NET, Node.js, JavaScript, REST, Azure, Docker, RabbitMQ, Redis, MSSQL, MongoDB, CICD, AzureDevOps, Jenkins, Microservices, MQTT, xUnit, NUnit, Mocha, Jest 🏢 Description: Senior Quality Engineer | Backend & IoT Platforms We are looking for a Senior Quality Engineer to support testing and quality assurance activities for modern backend and IoT-based solutions running in cloud environments. This role combines automated testing, backend validation, and close cooperation with development teams working on distributed microservices architecture. Additional information Work mode: Fully remote or hybrid (Wrocław) Rate: 100–120 PLN/h Responsibilities Develop and maintain automated test solutions using C#/.NET or Node.js technologies. Verify and test REST APIs, backend integrations, and asynchronous communication flows. Analyze and validate data consistency across relational and NoSQL databases. Support testing processes within containerized and CI/CD-based environments. Collaborate with developers, analysts, and stakeholders to ensure software quality and delivery standards. Maintain technical documentation and track progress using Jira and Confluence. Requirements Strong programming skills in C# or Node.js/JavaScript combined with backend testing experience. Practical knowledge of microservices architecture, REST APIs, and cloud-based solutions. Hands-on experience with Azure environments and backend integration testing. Familiarity with Docker, RabbitMQ, and Redis. Experience working with MSSQL and MongoDB databases. Understanding of CI/CD pipelines and tools such as Azure DevOps or Jenkins. Experience working in Agile/Scrum teams. Nice to have ISTQB Advanced Technical Test Analyst certification. Familiarity with IoT communication protocols such as MQTT. Experience with testing frameworks including xUnit, NUnit, Mocha, or Jest. Why apply for an Antal job offer? When your application is successful, you will be supported by a dedicated Consultant who will stay in regular contact with you (via email or phone), help you prepare for interviews with your future employer, and ensure a smooth and professional recruitment process. About Antal Antal is a leading recruitment and HR advisory company, present in Poland since 1996 and later expanded to the Czech Republic and Hungary. Across the CEE region, we employ around 150 professionals who deliver a full range of services – from specialist and executive recruitment, employee outsourcing and HR consulting, to employer branding and market research. Our division-based structure combines deep industry expertise with functional specialisation, enabling us to provide tailored solutions for companies in every sector. We act as a trusted partner for both employers and candidates, sharing our knowledge and guiding them through every stage of the talent journey. We connect exceptional people with the right opportunities and help organisations build successful teams. Discover our latest job openings: https://en.antal.pl/candidates Follow us on LinkedIn: https://www.linkedin.com/company/antalpoland

🏢 Summary: Senior Software Security Engineer role in a global banking cybersecurity initiative focused on building secure, scalable cloud-native backend platforms. The position combines hands-on development in Python and/or Node.js with ownership of production services on GCP and Kubernetes. It involves designing modern authentication solutions and distributed systems at enterprise scale. 🗂️ Requirements: Strong hands-on experience with Python (Django) and/or Node.js (TypeScript/NestJS), Experience building production-grade backend services, Experience designing and developing distributed systems, Hands-on experience with GCP services, Strong knowledge of Infrastructure as Code and Terraform, Experience designing scalable and secure cloud-native architectures, Solid knowledge of Kubernetes and containerized environments, Understanding of Zero Trust and modern security engineering practices, Experience with PostgreSQL performance optimization, Experience with event-driven architectures 📃 Skills: Python, Django, NodeJS, TypeScript, NestJS, GCP, Terraform, Kubernetes, PostgreSQL, OAuth2, OpenID, IaC, ZeroTrust, DistributedSystems, CloudNative, Containers, EventDriven, Observability, Automation, Security 🏢 Description: 📍 Location: Kraków (hybrid: 2 days in the office per week) 📄 B2B: 200 - 250 PLN / h 🏦 Industry: Banking We are currently looking for a Senior Software Security Engineer (Node.js and/or Python) to join a strategic global banking initiative focused on building modern, secure and scalable backend platforms within the cybersecurity domain. The role combines hands-on software engineering, cloud-native architecture and security engineering, with strong ownership of production-grade services and engineering excellence. You will work within international cross-functional teams responsible for developing next-generation security products and services, contributing to the migration from vendor-based platforms toward open-source and cloud-native solutions deployed at enterprise scale. Key responsibilities: Design, develop and maintain secure, scalable backend services using Python, Node.js and cloud-native technologies. Build and optimize distributed systems running on Google Cloud Platform and Kubernetes environments. Develop high-quality production code with strong focus on reliability, observability and automation. Own the lifecycle of backend services on GCP, ensuring resilience, performance and cost efficiency. Design and implement OAuth2/OpenID Connect authentication and authorization solutions. Contribute to event-driven architectures and highly concurrent backend systems. Collaborate closely with engineering and platform teams to deliver secure and scalable solutions. Mentor engineers and actively contribute to engineering best practices and technical excellence. Drive automation initiatives to improve developer productivity and operational efficiency. Stay up to date with modern backend and cloud technologies, sharing knowledge across teams. Requirements: Strong hands-on experience with Python (Django) and/or Node.js (Typescript/NestJS). Experience building production-grade backend services and distributed systems. Hands-on experience with GCP services. Strong understanding of Infrastructure as Code and Terraform. Experience designing scalable, secure and observable cloud-native architectures. Solid knowledge of Kubernetes and containerized environments. Understanding of Zero Trust and modern security engineering practices. Experience with PostgreSQL performance optimization and event-driven architectures. Strong engineering mindset with focus on automation, quality and operational excellence. Ability to work effectively in cross-functional and international engineering teams. Nice to have: Experience with Go or Rust. Contributions to open-source projects, technical blogging or public GitHub portfolio. Broad full-stack understanding with backend specialization. Passion for solving complex engineering and security challenges at scale. What we offer: Opportunity to work on strategic, global cybersecurity and cloud engineering initiatives. Collaboration with highly experienced international engineering teams. Long-term cooperation within a stable enterprise-scale environment. Private healthcare package (LuxMed). Multisport card. Why apply for an Antal job offer? When your application is successful, you will be supported by a dedicated Consultant who will stay in regular contact with you (via email or phone), help you prepare for interviews with your future employer, and ensure a smooth and professional recruitment process. About Antal Antal is a leading recruitment and HR advisory company, present in Poland since 1996 and later expanded to the Czech Republic and Hungary. Across the CEE region, we employ around 150 professionals who deliver a full range of services – from specialist and executive recruitment, employee outsourcing and HR consulting, to employer branding and market research. Our division-based structure combines deep industry expertise with functional specialisation, enabling us to provide tailored solutions for companies in every sector. We act as a trusted partner for both employers and candidates, sharing our knowledge and guiding them through every stage of the talent journey. We connect exceptional people with the right opportunities and help organisations build successful teams. Discover our latest job openings: https://en.antal.pl/candidates Follow us on LinkedIn: https://www.linkedin.com/company/antalpoland

🏢 Summary: Senior Software Security Engineer role focused on building secure, scalable backend platforms within a global banking cybersecurity initiative. The position combines hands-on development in Node.js and/or Python with cloud-native architecture on GCP and Kubernetes, emphasizing security, automation and production-grade reliability. You will design and own distributed, event-driven services while driving engineering excellence and cloud transformation. 🗂️ Requirements: Strong hands-on experience with Python (Django) and/or Node.js (TypeScript, NestJS), Experience building production-grade backend services, Experience with distributed systems, Hands-on experience with Google Cloud Platform, Experience with Infrastructure as Code, Practical knowledge of Terraform, Strong knowledge of Kubernetes, Experience with containerized environments, Experience designing secure, scalable cloud-native architectures, Knowledge of OAuth2 and OpenID Connect, Understanding of Zero Trust principles, Experience with PostgreSQL performance optimization, Experience with event-driven architectures 📃 Skills: Python, Django, Node.js, TypeScript, NestJS, GCP, Kubernetes, Terraform, OAuth2, OpenID, PostgreSQL, Docker, IaC, ZeroTrust 🏢 Description: 📍 Location: Kraków (hybrid: 2 days in the office per week) 📄 B2B: 200 - 250 PLN / h 🏦 Industry: Banking We are currently looking for a Senior Software Security Engineer (Node.js and/or Python) to join a strategic global banking initiative focused on building modern, secure and scalable backend platforms within the cybersecurity domain. The role combines hands-on software engineering, cloud-native architecture and security engineering, with strong ownership of production-grade services and engineering excellence. You will work within international cross-functional teams responsible for developing next-generation security products and services, contributing to the migration from vendor-based platforms toward open-source and cloud-native solutions deployed at enterprise scale. Key responsibilities: Design, develop and maintain secure, scalable backend services using Python, Node.js and cloud-native technologies. Build and optimize distributed systems running on Google Cloud Platform and Kubernetes environments. Develop high-quality production code with strong focus on reliability, observability and automation. Own the lifecycle of backend services on GCP, ensuring resilience, performance and cost efficiency. Design and implement OAuth2/OpenID Connect authentication and authorization solutions. Contribute to event-driven architectures and highly concurrent backend systems. Collaborate closely with engineering and platform teams to deliver secure and scalable solutions. Mentor engineers and actively contribute to engineering best practices and technical excellence. Drive automation initiatives to improve developer productivity and operational efficiency. Stay up to date with modern backend and cloud technologies, sharing knowledge across teams. Requirements: Strong hands-on experience with Python (Django) and/or Node.js (Typescript/NestJS). Experience building production-grade backend services and distributed systems. Hands-on experience with GCP services. Strong understanding of Infrastructure as Code and Terraform. Experience designing scalable, secure and observable cloud-native architectures. Solid knowledge of Kubernetes and containerized environments. Understanding of Zero Trust and modern security engineering practices. Experience with PostgreSQL performance optimization and event-driven architectures. Strong engineering mindset with focus on automation, quality and operational excellence. Ability to work effectively in cross-functional and international engineering teams. Nice to have: Experience with Go or Rust. Contributions to open-source projects, technical blogging or public GitHub portfolio. Broad full-stack understanding with backend specialization. Passion for solving complex engineering and security challenges at scale. What we offer: Opportunity to work on strategic, global cybersecurity and cloud engineering initiatives. Collaboration with highly experienced international engineering teams. Long-term cooperation within a stable enterprise-scale environment. Private healthcare package (LuxMed). Multisport card. Why apply for an Antal job offer? When your application is successful, you will be supported by a dedicated Consultant who will stay in regular contact with you (via email or phone), help you prepare for interviews with your future employer, and ensure a smooth and professional recruitment process. About Antal Antal is a leading recruitment and HR advisory company, present in Poland since 1996 and later expanded to the Czech Republic and Hungary. Across the CEE region, we employ around 150 professionals who deliver a full range of services – from specialist and executive recruitment, employee outsourcing and HR consulting, to employer branding and market research. Our division-based structure combines deep industry expertise with functional specialisation, enabling us to provide tailored solutions for companies in every sector. We act as a trusted partner for both employers and candidates, sharing our knowledge and guiding them through every stage of the talent journey. We connect exceptional people with the right opportunities and help organisations build successful teams. Discover our latest job openings: https://en.antal.pl/candidates Follow us on LinkedIn: https://www.linkedin.com/company/antalpoland

🏢 Summary: Senior Full Stack Engineer focused primarily on backend development in Node.js to build and maintain a scalable API layer. The role involves developing RESTful services, supporting React frontend integration, and contributing to IoT system architecture. Work includes ensuring high code quality, testing, and collaboration on modern distributed solutions. 🗂️ Requirements: Very good knowledge of Node.js, Very good knowledge of TypeScript, Commercial experience with React, Very good knowledge of JavaScript (ES6+), Experience designing and working with RESTful APIs 📃 Skills: Node.js, TypeScript, JavaScript, React, REST, NestJS, ExpressJS, PostgreSQL, MongoDB, Docker, Git, Redis, RabbitMQ, WebSockets, Jest, Mocha, Pactum, AWS, GCP, Azure, Linux 🏢 Description: We are looking for a Senior Full Stack Engineer – Backend (Node.js) Oriented to join a project focused on building an API layer. You will join a team developing modern, scalable services. Full Stack Engineer – Backend (Node.js) Oriented Type of cooperation: contracting via Antal Work mode: remote work Rate: PLN 150–160/h Responsibilities: Developing and maintaining backend applications using Node.js and TypeScript Co-developing and integrating frontend applications in React Designing and developing RESTful APIs used by web and mobile applications Collaborating on the design of IoT system architecture Maintaining high code quality and writing tests Key requirements: Very good knowledge of Node.js and TypeScript (must-have) Commercial experience working with React Very good knowledge of JavaScript (ES6+) Experience in designing and working with RESTful APIs Very good command of English (must-have) Additional requirements: Knowledge of backend frameworks (NestJS, ExpressJS, or similar) Experience with PostgreSQL and MongoDB databases Practical knowledge of Docker Advanced knowledge of Git Experience with Redis and RabbitMQ Knowledge of WebSockets Experience with testing tools (Jest, Mocha, Pactum, or similar) Knowledge of cloud platforms (AWS, GCP, or Azure) Knowledge of Linux systems Co zyskasz dzięki aplikacji na ofertę Antal? Gdy Twoja aplikacja zostanie rozpatrzona pozytywnie (zostaniesz zaproszony/a do procesu), otrzymasz wsparcie Konsultanta/Konsultantki, który/a utrzyma z Tobą stały kontakt (mailowo lub telefonicznie), pomoże Ci przygotować się do rozmowy rekrutacyjnej z przyszłym pracodawcą oraz zatroszczy się o jakość procesu rekrutacyjnego, w którym aktualnie bierzesz udział. Kim jesteśmy? Jesteśmy liderem rekrutacji specjalistów i menedżerów oraz doradztwa w obszarze HR. Marka obecna jest w 35 krajach, w Polsce działa od 1996 roku. Przez ten czas zbudowaliśmy wiele karier kandydatów, dzięki elastycznemu i kompleksowemu podejściu do wszystkich rekrutacji. Antal tworzy ponad 130 profesjonalnych konsultantów ds. rekrutacji, którzy są oni nie tylko skutecznymi rekruterami, ale także wykwalifikowanymi doradcami, specjalizującymi się zarówno w zakresie wybranego sektora, jak i stanowiska. Sprawdź inne aktualne oferty pracy na: https://antal.pl/dla-kandydata Zaobserwuj nasz profil na LinkedIn: https://www.linkedin.com/company/antalpoland

🏢 Summary: Senior Backend Engineer role focused on designing and building scalable Java-based microservices and REST APIs for a global payments platform. The position involves modernizing legacy systems into cloud-native architectures and improving reliability and performance in a Kubernetes environment. You will work on high-scale international payment solutions within a hybrid setup in Kraków. 🗂️ Requirements: Strong experience with Java 11+, Experience building microservices, Experience developing REST APIs, Hands-on experience with Kubernetes, Solid knowledge of SQL and relational databases, Experience with Git, Experience working in Unix/Linux environments, Understanding of DevOps practices 📃 Skills: Java, Spring, Kubernetes, SQL, Oracle, Git, Linux, Unix, REST, Microservices, CI/CD, React 🏢 Description: Senior Software Engineer (Backend) – Java 📍 Kraków | Hybrid (2x day per week from the office) We are looking for an experienced Senior Software Engineer (Backend) to join a global technology team working on a large-scale payments platform that enables businesses and customers worldwide to move funds quickly and securely across markets. The platform supports international transfers, supplier payments, payroll processing, and payments to authorities across multiple channels. You will contribute to building modern, scalable systems used globally. What you will be doing • Design, develop and maintain backend services and microservices in Java • Build scalable REST APIs supporting a global payments platform • Contribute to the migration from legacy systems to a modern microservices architecture • Work with Kubernetes-based platforms and cloud-native environments • Improve system reliability, performance and Straight‑Through‑Processing (STP) capabilities • Collaborate with international engineering teams, DevOps and product stakeholders • Contribute to test automation and modern CI/CD practices What we are looking for • Strong experience with Java (11+) , ideally Java 17+ • Experience building microservices and REST APIs • Hands-on experience with Kubernetes • Solid knowledge of SQL and relational databases (Oracle is a plus) • Experience with Git and modern development workflows • Comfortable working in Unix/Linux environments • Understanding of DevOps ways of working Nice to have: • Experience with Spring / Spring Boot • Experience with React or modern frontend technologies • Familiarity with application monitoring / observability tools What we offer • Opportunity to work on a global, high-scale payments platform • Collaboration with international engineering teams • Modern technology stack and cloud-native environment • Hybrid work model in Kraków Why apply for an Antal job offer? When your application is successful, you will be supported by a dedicated Consultant who will stay in regular contact with you (via email or phone), help you prepare for interviews with your future employer, and ensure a smooth and professional recruitment process. About Antal Antal is a leading recruitment and HR advisory company, present in Poland since 1996 and later expanded to the Czech Republic and Hungary. Across the CEE region, we employ around 150 professionals who deliver a full range of services – from specialist and executive recruitment, employee outsourcing and HR consulting, to employer branding and market research. Our division-based structure combines deep industry expertise with functional specialisation, enabling us to provide tailored solutions for companies in every sector. We act as a trusted partner for both employers and candidates, sharing our knowledge and guiding them through every stage of the talent journey. We connect exceptional people with the right opportunities and help organisations build successful teams.

🏢 Summary: Senior Backend Engineer role in banking focused on designing and developing high-availability, high-performance backend systems based on Java and microservices architecture. The position involves defining technical architecture, building scalable solutions processing large data volumes, and deploying services in cloud and Kubernetes environments. The engineer will collaborate within CI/CD-driven teams to ensure quality, security, and reliability of distributed systems. 🗂️ Requirements: 10+ years of software engineering experience, Strong backend development experience in Java, Experience with microservices architecture, Hands-on experience with RESTful APIs and HTTPS, Experience with message queues (MQ), Proven experience designing high-availability and high-performance systems, Strong knowledge of SQL and relational databases, Experience processing large data volumes in distributed systems, Practical experience with Go, Rust or similar system languages, Experience with NoSQL and analytical databases, Experience with Kubernetes and cloud platforms (preferably GCP), Knowledge of CI/CD practices, Understanding of cybersecurity principles, Banking domain knowledge (trade lifecycle, post-trade processing, FX) 📃 Skills: Java, Go, Rust, REST, HTTPS, MQ, SQL, PostgreSQL, ClickHouse, NoSQL, Kubernetes, GCP, CI/CD, Microservices 🏢 Description: Dla naszego klienta z obszaru bankowości poszukujemy doświadczonego specjalisty na stanowisko Senior Backend Engineera, który będzie odpowiedzialny za projektowanie i rozwój kluczowych systemów back-endowych w środowisku o wysokiej dostępności i wydajności. Zakres obowiązków Projektowanie i rozwój nowoczesnych systemów back-endowych w oparciu o Java oraz architekturę mikroserwisową Tworzenie i rozwijanie skalowalnych oraz wysokowydajnych rozwiązań dla systemów przetwarzających duże wolumeny danych Definiowanie architektury technicznej oraz podejmowanie kluczowych decyzji projektowych Współpraca z zespołami developerskimi, DevOps oraz security w ramach nowoczesnych metodyk wytwarzania oprogramowania (CI/CD) Utrzymanie wysokich standardów jakości, bezpieczeństwa i niezawodności systemów Wdrażanie oraz operowanie rozwiązaniami w środowisku chmurowym (preferencyjnie GCP) oraz Kubernetes Doświadczenie zawodowe / Wymagane umiejętności Ponad 10 lat doświadczenia w inżynierii oprogramowania, w tym praktyczne umiejętności programowania w nowoczesnym języku Java po stronie back-end, z wykorzystaniem HTTPS, RESTful API, mikroserwisów oraz MQ Bardzo dobra znajomość i solidne doświadczenie w projektowaniu architektury technicznej / rozwiązań dla dużych systemów back-end, z wymaganiami w zakresie: wysokiej dostępności wysokiej wydajności SQL / relacyjnych baz danych skalowalności łatwości utrzymania Doświadczenie w pracy z zespołem dostarczającym rozwiązania techniczne w oparciu o nowoczesne metodyki inżynierii oprogramowania, w tym znajomość CI/CD oraz cyberbezpieczeństwa Kluczowe umiejętności i kwalifikacje na to stanowisko Praktyczne doświadczenie programistyczne, szczególnie w obszarze back-end Doświadczenie w przetwarzaniu dużych wolumenów danych oraz w środowiskach rozproszonych Praktyczna znajomość języków Go, Rust lub podobnych nowoczesnych języków systemowych Doświadczenie z technologiami bazodanowymi, w tym NoSQL, bazami kolumnowymi, relacyjnymi oraz systemami analitycznymi (np. PostgreSQL, ClickHouse lub podobne) Doświadczenie w budowie i utrzymaniu usług na Kubernetes oraz platformach chmurowych, preferencyjnie GCP Umiejętności i doświadczenie w tworzeniu front-endu Wiedza domenowa w obszarze bankowości – cykl życia transakcji (trade lifecycle) oraz przetwarzanie potransakcyjne produktów inwestycyjnych, szczególnie FX Oferujemy Udział w projektach o dużej skali i znaczeniu biznesowym Pracę przy nowoczesnych technologiach i architekturach systemów rozproszonych Możliwość realnego wpływu na rozwiązania techniczne i architekturę Elastyczne formy współpracy (B2B / UoP) Pracę w modelu hybrydowym - 6 dni/ miesiąc z biura w Krakowie Co zyskasz dzięki aplikacji na ofertę Antal? Gdy Twoja aplikacja zostanie rozpatrzona pozytywnie (zostaniesz zaproszony/a do procesu), otrzymasz wsparcie Konsultanta/Konsultantki, który/a utrzyma z Tobą stały kontakt (mailowo lub telefonicznie), pomoże Ci przygotować się do rozmowy rekrutacyjnej z przyszłym pracodawcą oraz zatroszczy się o jakość procesu rekrutacyjnego, w którym aktualnie bierzesz udział. Kim jesteśmy? Jesteśmy liderem rekrutacji specjalistów i menedżerów oraz doradztwa w obszarze HR. Marka obecna jest w 35 krajach, w Polsce działa od 1996 roku. Przez ten czas zbudowaliśmy wiele karier kandydatów, dzięki elastycznemu i kompleksowemu podejściu do wszystkich rekrutacji. Antal tworzy ponad 130 profesjonalnych konsultantów ds. rekrutacji, którzy są oni nie tylko skutecznymi rekruterami, ale także wykwalifikowanymi doradcami, specjalizującymi się zarówno w zakresie wybranego sektora, jak i stanowiska. Sprawdź inne aktualne oferty pracy na: https://antal.pl/dla-kandydata Zaobserwuj nasz profil na LinkedIn: https://www.linkedin.com/company/antalpoland

🏢 Summary: Remote B2B contract for a Backend Developer to build and maintain an API layer for an IoT stack. The role focuses on developing high-performance backend services in TypeScript and Node.js, used by mobile and web applications, within a modern cloud-native environment. 🗂️ Requirements: Very good knowledge of JavaScript and TypeScript, Strong practical experience with Node.js, Experience with NestJS or ExpressJS, Experience designing and building REST APIs, Experience with PostgreSQL and MongoDB, Experience working with Docker, Advanced knowledge of Git, Experience with Redis and RabbitMQ, Knowledge of WebSockets, Experience with testing frameworks, Knowledge of at least one cloud platform: AWS, GCP or Azure, Knowledge of Linux 📃 Skills: JavaScript, TypeScript, Node.js, NestJS, ExpressJS, REST, PostgreSQL, MongoDB, Docker, Git, Redis, RabbitMQ, WebSockets, Jest, Mocha, Pactum, AWS, GCP, Azure, Linux, Kubernetes 🏢 Description: Lokalizacja: praca w trybie zdalnym Forma zatrudnienia: B2B, contracting Stawka: 140 - 160 zł/h Poszukiwany jest specjalista do pracy nad projektem polegającym na dostarczaniu warstwy API dla stosu IoT. W projekcie wykorzystywane są nowoczesne technologie, takie jak TypeScript, Node.js oraz Kubernetes, w celu tworzenia wydajnych i funkcjonalnych usług backendowych przeznaczonych do wykorzystania przez różne aplikacje, w tym mobilne i webowe. Do głównych obowiązków na tym stanowisku należy rozwój aplikacji backendowych z wykorzystaniem języka TypeScript w środowisku Node.js. Wymagania minimalne: Bardzo dobra znajomość JavaScript/TypeScript oraz solidne doświadczenie praktyczne z Node.js Dobra znajomość NestJS, ExpressJS lub innych podobnych frameworków Doświadczenie w projektowaniu, tworzeniu i korzystaniu z RESTowych API Praktyczne doświadczenie z bazami danych PostgreSQL i MongoDB Doświadczenie w pracy z Dockerem w środowisku deweloperskim Zaawansowana znajomość Git Doświadczenie z Redis oraz RabbitMQ Znajomość WebSockets Doświadczenie z frameworkami testowymi (Jest, Mocha, Pactum lub podobne) Znajomość przynajmniej jednej platformy chmurowej (AWS, GCP lub Azure) Znajomość systemów operacyjnych Linux Bardzo dobra znajomość języka angielskiego Co zyskasz dzięki aplikacji na ofertę Antal? Gdy Twoja aplikacja zostanie rozpatrzona pozytywnie (zostaniesz zaproszony/a do procesu), otrzymasz wsparcie Konsultanta/Konsultantki, który/a utrzyma z Tobą stały kontakt (mailowo lub telefonicznie), pomoże Ci przygotować się do rozmowy rekrutacyjnej z przyszłym pracodawcą oraz zatroszczy się o jakość procesu rekrutacyjnego, w którym aktualnie bierzesz udział. Kim jesteśmy? Jesteśmy liderem rekrutacji specjalistów i menedżerów oraz doradztwa w obszarze HR. Marka obecna jest w 35 krajach, w Polsce działa od 1996 roku. Przez ten czas zbudowaliśmy wiele karier kandydatów, dzięki elastycznemu i kompleksowemu podejściu do wszystkich rekrutacji. Antal tworzy ponad 130 profesjonalnych konsultantów ds. rekrutacji, którzy są oni nie tylko skutecznymi rekruterami, ale także wykwalifikowanymi doradcami, specjalizującymi się zarówno w zakresie wybranego sektora, jak i stanowiska.

🏢 Summary: Hybrid Backend Engineer role focused on designing and building scalable, fault-tolerant backend systems within a microservices and event-driven architecture. The position involves developing secure, production-ready APIs, contributing to modern cloud-native infrastructure, and ensuring high code quality and best practices. You will also support architectural evolution and deliver end-to-end business solutions in a DevOps-driven environment. 🗂️ Requirements: Strong experience with Java 8+, Proficiency in Spring Framework, Spring Boot, Spring Cloud, Hands-on experience with Kubernetes and Docker, Experience with public cloud platforms, Knowledge of Microservices Architecture, Knowledge of Event-Driven Architecture, Experience designing REST and GraphQL APIs, Experience with SQL and NoSQL databases, Experience with messaging systems, Understanding of security mechanisms (JWT, OAuth, TLS), Experience with CI/CD pipelines and DevOps tools, Knowledge of design patterns and scalable system design, Ability to deliver end-to-end backend applications 📃 Skills: Java, Spring, SpringBoot, SpringCloud, Kubernetes, Docker, REST, GraphQL, SQL, NoSQL, Oracle, PostgreSQL, MySQL, MongoDB, Cassandra, Kafka, RabbitMQ, IBMMQ, JWT, OAuth, TLS, Jenkins, GitLab, Microservices, CI/CD, Cloud 🏢 Description: Backend Engineer (Hybrid – 2 days/week in the office) We are looking for an experienced Backend Engineer to join a high-performing engineering team. In this role, you will be responsible for building scalable, high-quality backend systems and contributing to modern architecture initiatives. Responsibilities Design and develop highly scalable, performant, and fault-tolerant applications Contribute to the evolution of Microservices and Event-Driven Architecture Collaborate with Solution Architects and Tech Leads to translate technical designs into production-ready solutions Design systems with a strong focus on security, infrastructure, and data governance standards Contribute to system and API design, ensuring modularity and maintainability Ensure coding standards and promote best practices in development, testing, and documentation Mentor junior engineers, conduct code reviews, and provide technical leadership Ensure compliance with relevant controls, standards, and service management practices Deliver high-quality solutions on time, aligned with business expectations Support team engagement, ownership, and a sustainable, high-quality delivery pace Requirements Strong experience with Java 8+ , Spring Framework , Spring Boot , Spring Cloud Hands-on experience with Kubernetes , Docker , databases, and public cloud platforms Deep understanding of Microservices Architecture and Event-Driven Architecture Strong knowledge of design patterns and principles (focus on scalability and maintainability) Expertise in designing and developing APIs ( REST , GraphQL ) Experience with both SQL and NoSQL databases (e.g. Oracle, PostgreSQL, MySQL, MongoDB, Cassandra) Experience with messaging/middleware technologies (e.g. Kafka, IBM MQ, RabbitMQ) Understanding of security mechanisms (JWT, OAuth, TLS, authentication & authorization) Experience with DevOps tools and CI/CD pipelines (e.g. Jenkins, GitLab, Kubernetes, Docker) Proven experience in technical leadership and working with cross-functional teams Ability to deliver end-to-end business applications with high quality and low maintenance overhead Basic understanding of frontend-backend integration Why apply for an Antal job offer? When your application is successful, you will be supported by a dedicated Consultant who will stay in regular contact with you (via email or phone), help you prepare for interviews with your future employer, and ensure a smooth and professional recruitment process. About Antal Antal is a leading recruitment and HR advisory company, present in Poland since 1996 and later expanded to the Czech Republic and Hungary. Across the CEE region, we employ around 150 professionals who deliver a full range of services – from specialist and executive recruitment, employee outsourcing and HR consulting, to employer branding and market research. Our division-based structure combines deep industry expertise with functional specialisation, enabling us to provide tailored solutions for companies in every sector. We act as a trusted partner for both employers and candidates, sharing our knowledge and guiding them through every stage of the talent journey. We connect exceptional people with the right opportunities and help organisations build successful teams. Discover our latest job openings: https://en.antal.pl/candidates Follow us on LinkedIn: https://www.linkedin.com/company/antalpoland

🏢 Summary: Senior Full Stack Engineer role focused on building and scaling a global cloud-based platform using Node.js and TypeScript. The position involves designing scalable microservices, event-driven systems, and modern React/Next.js applications handling large volumes of real-time data. The engineer will contribute to architecture, API design, and system reliability across distributed systems. 🗂️ Requirements: 5+ years of software engineering experience, Strong expertise in Node.js, Strong expertise in TypeScript, Experience with event-driven architectures, Advanced knowledge of asynchronous programming, Experience designing and maintaining complex APIs, Strong experience with React and Next.js, Hands-on experience with automated testing frameworks, Experience with SQL and/or NoSQL databases, Familiarity with Elasticsearch or OpenSearch 📃 Skills: Node.js, TypeScript, React, Next.js, Kafka, RabbitMQ, SQL, NoSQL, Elasticsearch, OpenSearch, Jest, Vitest, Playwright, Microservices, APIs, EventDriven, Asynchronous, Testing, Architecture 🏢 Description: Senior Full Stack Engineer (Node.js & TypeScript) About the Role We are looking for a Senior Full Stack Engineer to join a team building and scaling a global cloud-based platform. In this role, you will work on both backend services and modern web applications, helping to design highly scalable systems that process large volumes of real-time data while delivering seamless user experiences. Responsibilities System Architecture Design and develop scalable microservices using Node.js and TypeScript. Ensure high availability, reliability, and low latency across distributed systems. Contribute to architectural decisions and long-term platform scalability. Backend Development & Event-Driven Systems Build and optimize event-driven and asynchronous workflows. Work with messaging technologies such as Kafka or RabbitMQ. Design solutions capable of handling large-scale real-time data processing. API Design Own the design and evolution of APIs. Create high-performance, type-safe interfaces connecting multiple services and applications. Promote best practices around API versioning and contract-driven development. Frontend Development Develop modern web applications using React and Next.js. Focus on performance, maintainability, and excellent user experience. Implement efficient state management solutions and responsive interfaces. Quality & Reliability Design and maintain comprehensive testing strategies, including Unit, Integration, and End-to-End testing. Work with tools such as Jest, Vitest, and Playwright. Contribute to a culture focused on code quality and system reliability. Requirements 5+ years of experience in software engineering. Strong expertise in Node.js and TypeScript. Experience designing and implementing event-driven architectures. Advanced knowledge of asynchronous programming patterns. Proven experience designing and maintaining complex APIs. Strong frontend development skills with React and Next.js. Hands-on experience with automated testing frameworks. Experience with SQL and/or NoSQL databases. Familiarity with search technologies such as Elasticsearch or OpenSearch. Professional-level English communication skills. Ability to collaborate across teams and support technical decision-making. Nice to Have Interest or experience in AI-related projects. Knowledge of vector databases. Experience building services in Python. What’s Offered Opportunity to work on large-scale, modern cloud solutions. Influence on architecture and technical direction. Collaborative engineering culture with knowledge-sharing initiatives. Stable employment in an international environment. Flexible working hours and hybrid work model. Comprehensive benefits package, including private healthcare, sports card, insurance options, and additional employee perks. Why apply for an Antal job offer? When your application is successful, you will be supported by a dedicated Consultant who will stay in regular contact with you (via email or phone), help you prepare for interviews with your future employer, and ensure a smooth and professional recruitment process. About Antal Antal is a leading recruitment and HR advisory company, present in Poland since 1996 and later expanded to the Czech Republic and Hungary. Across the CEE region, we employ around 150 professionals who deliver a full range of services – from specialist and executive recruitment, employee outsourcing and HR consulting, to employer branding and market research. Our division-based structure combines deep industry expertise with functional specialisation, enabling us to provide tailored solutions for companies in every sector. We act as a trusted partner for both employers and candidates, sharing our knowledge and guiding them through every stage of the talent journey. We connect exceptional people with the right opportunities and help organisations build successful teams. Discover our latest job openings: https://en.antal.pl/candidates Follow us on LinkedIn: https://www.linkedin.com/company/antalpoland

🏢 Summary: Senior Frontend Engineer role in a hybrid model (Kraków) on a B2B contract, focused on building and modernizing user interfaces for a global payments platform in the financial sector. The position involves developing scalable front-end applications and micro frontends, integrating with payment systems, and working in an Agile DevOps environment. The engineer will contribute to high-performance solutions supporting international payment processing across EMEA. 🗂️ Requirements: Strong experience with React 18, Strong experience with TypeScript 5, Strong experience with Bootstrap 5, Experience with REST APIs, Understanding of microservices architecture, Experience with SQL and databases, Experience with Java 8+, Familiarity with JSP, Experience in Agile environments, Experience in DevOps environments 📃 Skills: React, TypeScript, Bootstrap, Java, SQL, REST, Microservices, JSP, CI/CD, Agile, DevOps 🏢 Description: 📍 Location: Kraków, Poland (hybrid - 2 days per week in the office) 📄 B2B Contract: 180 - 200 PLN / hour We are looking for a Senior Frontend Engineer to join an international project delivered for a large organization within the financial services sector. The team is responsible for developing and maintaining a global payments platform that enables fast and secure fund transfers across multiple channels, including supplier payments, salaries, and tax transactions. This role focuses on building modern user interfaces and front-end services that support payment processing systems (e.g. SEPA, SWIFT) as well as internal tools used across the EMEA region. You will work in an Agile, DevOps-driven environment, contributing to scalable and high-performance solutions. Key Responsibilities: Develop and maintain modern front-end applications using React, TypeScript, and Java Build UI services and micro frontends supporting payment processing systems Collaborate with backend engineers to integrate APIs and microservices Improve system usability through intuitive interfaces and user-focused design Contribute to reducing operational complexity by building interactive tools and dashboards Support automation initiatives, including test automation and CI/CD improvements Enhance system efficiency and Straight-Through-Processing (STP) capabilities Maintain and modernize legacy UI components (e.g. JSP-based solutions) Work closely with stakeholders and distributed teams across different regions Requirements: Strong hands-on experience with React 18, TypeScript 5, Bootstrap 5 Solid understanding of RESTful APIs and microservices architecture Experience working with SQL and databases Java8+ essential, Java17+ preferable Familiarity with legacy frontend technologies (e.g. JSP) Experience working in Agile / DevOps environments Strong analytical and problem-solving skills English proficiency at B2+ level Nice to Have: Experience in payments / financial systems What We Offer: Long-term cooperation on an enterprise-scale international project Opportunity to work on high-impact global payment systems Real influence on user experience and internal platform development Private medical care (LuxMed) & Multisport card Collaboration with experienced, international engineering teams Why apply for an Antal job offer? When your application is successful, you will be supported by a dedicated Consultant who will stay in regular contact with you (via email or phone), help you prepare for interviews with your future employer, and ensure a smooth and professional recruitment process. About Antal Antal is a leading recruitment and HR advisory company, present in Poland since 1996 and later expanded to the Czech Republic and Hungary. Across the CEE region, we employ around 150 professionals who deliver a full range of services – from specialist and executive recruitment, employee outsourcing and HR consulting, to employer branding and market research. Our division-based structure combines deep industry expertise with functional specialisation, enabling us to provide tailored solutions for companies in every sector. We act as a trusted partner for both employers and candidates, sharing our knowledge and guiding them through every stage of the talent journey. We connect exceptional people with the right opportunities and help organisations build successful teams.