Svelte UI Developer (f/m/x)

🏢 Summary: Senior Frontend Engineer role focused on building and scaling a modern fintech platform for managing corporate spending. The position involves leading development of React and TypeScript-based SPA applications, integrating with microservices and APIs, and driving performance and architectural improvements. You will collaborate cross-functionally while mentoring engineers and shaping scalable front-end solutions in a cloud-native environment. 🗂️ Requirements: 5+ years professional software engineering experience, Strong commercial experience with React, Strong expertise in TypeScript, Advanced knowledge of modern JavaScript (ES6+), Experience building large-scale SPA applications, Experience designing scalable front-end architectures, Experience working with APIs and microservices-based systems, Hands-on experience with front-end testing (unit, integration, e2e), Experience with CI/CD pipelines, Experience with AWS, Experience with Kubernetes, Professional English proficiency (min. B2), Fluent Polish, Residence in Poland 📃 Skills: React, TypeScript, JavaScript, ES6, SPA, REST, GraphQL, Microservices, CI/CD, AWS, Kubernetes, Testing, SSR 🏢 Description: Join a team building a modern fintech platform that helps businesses manage company spending more efficiently. The project focuses on developing a financial product that enables seamless integration of financial tools—including corporate cards, expense management, and invoice processing—directly with partner ecosystems such as banks, accounting platforms, and HR systems. The platform empowers companies to automate financial operations, simplify reconciliation processes, and gain full real-time visibility into their spending. Your tasks Lead initiatives focused on designing, building, and maintaining scalable front-end applications primarily using React and TypeScript Build modern, performant, and intuitive user interfaces for key areas of the fintech platform Collaborate closely with cross-functional teams across backend engineering, product, and design to deliver scalable product solutions Integrate front-end applications with microservices-based architectures and APIs (REST / GraphQL) Analyze application performance and implement optimizations to ensure high responsiveness, reliability, and scalability Participate in code reviews, architecture discussions, and post-mortems while mentoring other engineers Proactively address technical debt and guide the team through technical challenges, refactoring initiatives, and architectural migrations Requirements At least 5 years of professional software engineering experience, including strong commercial experience with React Strong expertise in TypeScript, modern JavaScript (ES6+), and building large-scale SPA applications Solid experience designing scalable front-end architectures using component-based and modular design principles Experience working with APIs and distributed systems in microservices-based environments Hands-on experience with front-end testing frameworks (unit, integration, e2e) and observability/monitoring tools Previous work with CI/CD pipelines, cloud environments such as AWS, and container orchestration platforms like Kubernetes Strong problem-solving skills, ownership mindset, and passion for mentoring and elevating engineering teams Professional English proficiency - minimum B2 Fluent in Polish required Residing in Poland required Nice-to-have requirements Previous experience in fintech or building financial products Understanding of payments, cards, expense management, or accounting-related domains Experience working in a scale-up environment Experience with GraphQL, SSR, performance optimization, or building design systems What we offer Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more Comfortable workplace – class A offices or remote work Dozens of fascinating projects for prestigious brands from all over the world PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers Investment in your growth – meetups, webinars, training platform and technology blog – you choose Fantastic atmosphere created by all Sii Power People If you want to work on systems with high operational significance — apply now!

🏢 Summary: Offer for a Test Automation Engineer to work on a large, modular banking system supporting payments, workflows, and document management. The role focuses on automated testing of client-facing and internal banking applications, including backend components and administrative modules. Work is project-based within a cross-functional team, contributing to high-impact financial systems. 🗂️ Requirements: Minimum 3 years of experience in test automation using Java, Hands-on experience with Selenium or Selenide, Experience with Cucumber, Experience with Rest Assured, Experience with Git, Experience with Jenkins, Fluent Polish, Fluent English, Availability for hybrid work (3 days per week in Kraków office), Residence in Poland 📃 Skills: Java, Selenium, Selenide, Cucumber, RestAssured, Git, Jenkins 🏢 Description: We are looking for a person who will work with us on a modern application for managing processes and exchanging documents between a bank and its clients. What do we do? We are developing a large, modular system in which each module has its own unique responsibilities — from handling payment processes and document exchange with clients, through advanced internal applications with schedules and checklists, to the administration and customization of business processes. Your tasks Testing a client-facing application responsible for payments, workflows, and document management Working with internal banking systems, including workflow modules, calendars, and administrative panels Verifying administrator dashboards, including backend components of modules and calendars Working in a task-oriented, project-based mode (code reviews, collaborative problem-solving) Collaborating closely within a cross-functional team, including Tech Lead, 2 Business Analysts, a Scrum Master, 5 Testers, as well as 6 Backend and 6 Frontend Developers Requirements At least 3 years of experience in test automation using Java Fluent proficiency in both Polish and English Experience and willingness to grow in technologies such as Java, Selenium (Selenide), Cucumber, Rest Assured, Git, and Jenkins Availability for hybrid work — 3 days per week in the office in Kraków Residing in Poland required Additional benefits Variety of responsibilities — you can be involved in frontend, backend, and integrations with external systems Large-scale projects that are well structured into modules making it easy to onboard and navigate the work Opportunity to introduce test automation and new technologies, e.g. migrating from Selenium to Playwright A real impact on improving customer service and optimizing business processes What we offer Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more Comfortable workplace – class A offices or remote work Dozens of fascinating projects for prestigious brands from all over the world PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers Investment in your growth – meetups, webinars, training platform and technology blog – you choose Fantastic atmosphere created by all Sii Power People If you want to work on systems with high operational significance — apply now!

🏢 Summary: The role involves automated testing of a modern, modular banking application supporting payments, workflows, and document management for client-facing and internal systems. The position focuses on developing and maintaining test automation frameworks while collaborating within a cross-functional Scrum team. It offers work on large-scale, high-impact systems with opportunities to introduce new automation technologies. 🗂️ Requirements: Minimum 3 years of experience in test automation using Java, Experience with Selenium or Selenide, Experience with Cucumber, Experience with Rest Assured, Experience with Git, Experience with Jenkins, Fluent Polish and English, Availability for hybrid work (3 days per week in Kraków office), Residence in Poland 📃 Skills: Java, Selenium, Selenide, Cucumber, RestAssured, Git, Jenkins 🏢 Description: We are looking for a person who will work with us on a modern application for managing processes and exchanging documents between a bank and its clients. What do we do? We are developing a large, modular system in which each module has its own unique responsibilities — from handling payment processes and document exchange with clients, through advanced internal applications with schedules and checklists, to the administration and customization of business processes. Your tasks Testing a client-facing application responsible for payments, workflows, and document management Working with internal banking systems, including workflow modules, calendars, and administrative panels Verifying administrator dashboards, including backend components of modules and calendars Working in a task-oriented, project-based mode (code reviews, collaborative problem-solving) Collaborating closely within a cross-functional team, including Tech Lead, 2 Business Analysts, a Scrum Master, 5 Testers, as well as 6 Backend and 6 Frontend Developers Requirements At least 3 years of experience in test automation using Java Fluent proficiency in both Polish and English Experience and willingness to grow in technologies such as Java, Selenium (Selenide), Cucumber, Rest Assured, Git, and Jenkins Availability for hybrid work — 3 days per week in the office in Kraków Residing in Poland required Additional benefits Variety of responsibilities — you can be involved in frontend, backend, and integrations with external systems Large-scale projects that are well structured into modules making it easy to onboard and navigate the work Opportunity to introduce test automation and new technologies, e.g. migrating from Selenium to Playwright A real impact on improving customer service and optimizing business processes What we offer Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more Comfortable workplace – class A offices or remote work Dozens of fascinating projects for prestigious brands from all over the world PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers Investment in your growth – meetups, webinars, training platform and technology blog – you choose Fantastic atmosphere created by all Sii Power People If you want to work on systems with high operational significance — apply now!

🏢 Summary: Role focused on designing and developing scalable microservices for a modern fintech expense management platform integrating payments, cards, and invoicing into partner systems. The position involves leading technical initiatives, optimizing system performance, and ensuring high reliability in a cloud-based distributed environment. You will also mentor engineers and drive technical improvements across the platform. 🗂️ Requirements: Minimum 5 years of professional software development experience, Strong expertise in Kotlin, Experience with distributed systems, Experience with microservices architecture, Experience with cloud environments (AWS, Kubernetes), Proficiency with PostgreSQL or other relational databases, Experience with JUnit and Testcontainers, Experience with observability tools such as Grafana, Very good English (minimum B2), Fluent Polish, Residence in Poland 📃 Skills: Kotlin, AWS, Kubernetes, PostgreSQL, JUnit, Testcontainers, Grafana, Microservices, DistributedSystems, Cloud 🏢 Description: Join a team working on a modern fintech platform that supports company expense management. The project focuses on developing a finance solution that enables seamless integration of financial tools (including payment cards, expense management, and invoice handling) directly into partner systems such as banks, accounting platforms, and HR solutions. The product being developed allows companies to simplify financial processes, automate settlements, and gain full real-time control over their spending. Your tasks Leading initiatives to design, build, and maintain scalable microservices primarily using Kotlin Collaborating with cross-functional teams to develop innovative solutions across Platform, Services, SMB, and other domains Analyzing system performance and implementing optimizations to ensure high reliability and scalability Participating in code reviews, post-mortems, and providing mentorship to other engineers Proactively improving the architecture and quality of solutions, and leading the team through technical challenges and migrations Requirements Minimum 5 years of professional experience in software development Expertise in server-side languages, especially Kotlin, and experience with distributed systems, microservices, and cloud environments (e.g., AWS, Kubernetes) Proficiency with relational databases like PostgreSQL, testing frameworks (e.g., JUnit, Testcontainers), and observability tools like Grafana Strong problem-solving skills and a collaborative mindset to mentor and upskill your teammates Very good knowledge of English - min. B2 level Residing in Poland required Nice-to-have requirements Previous work in the fintech industry or with financial products Knowledge of topics related to payments, cards, or accounting Experience working in a scale-up environment Proficiency in one of the following front-end technologies: React or TypeScript What we offer Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more Comfortable workplace – class A offices or remote work Dozens of fascinating projects for prestigious brands from all over the world PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers Investment in your growth – meetups, webinars, training platform and technology blog – you choose Fantastic atmosphere created by all Sii Power People If you want to work on systems with high operational significance — apply now!

🏢 Summary: The offer is for a Software Supply Chain Engineer responsible for ensuring open-source compliance and regulatory alignment within software products in a regulated healthcare environment. The role focuses on generating and managing SBOMs, integrating compliance checks into CI/CD pipelines, and overseeing dependency management across multiple programming languages. You will work closely with architects, developers, and DevOps to minimize compliance risks and strengthen software supply chain integrity. 🗂️ Requirements: Minimum 5 years experience in open-source compliance, Hands-on experience with CycloneDX or similar SBOM formats, Experience integrating compliance checks into CI/CD pipelines, Dependency management for at least two programming languages (.NET/C#, Python, Java, C/C++, Node.JS/TypeScript), Knowledge of Linux and Windows operating systems, Experience working in regulated environments 📃 Skills: CycloneDX, SBOM, CI/CD, .NET, C#, Python, Java, C, C++, Node.js, TypeScript, Linux, Windows, DevOps, Open-source, Compliance 🏢 Description: Join a leading healthcare organization committed to providing innovative and regulated solutions that adhere to the highest standards of patient safety and regulatory compliance. To strengthen our Software Supply Chain Compliance & Integrity team, we are seeking an experienced Software Supply Chain Engineer who can work collaboratively with software architects, developers, and cross-functional teams to ensure our products meet regulatory requirements. Your tasks Collaborate with software architects, senior developers, and DevOps to generate a comprehensive Software Bill of Materials (SBOM) Review, analyze, and assess the usage of open-source software in our products to ensure compliance with relevant regulations and licenses Integrate open-source compliance checks into CI/CD pipelines, facilitating the early identification of compliance issues and minimizing compliance risks Manage dependencies for at least two of the following programming languages: .NET/C#, Python, Java, C/C++, Node.JS/TypeScript, considering both proprietary and open-source components Create and maintain clear and concise compliance documentation, including policies, procedures, and best practices, to foster a compliant development environment Utilize your expertise with CycloneDX, a lightweight SBOM standard, to enhance the accuracy and efficiency of our compliance processes Requirements Minimum 5 years of practical experience in open-source compliance, working with CycloneDX or similar SBOM formats, preferably in a regulated industry such as healthcare or medical devices Expertise with CI/CD pipelines and integrating open-source compliance checks into the development process Familiarity with managing dependencies for two or more programming languages, such as .NET/C#, Python, Java, C/C++, Node.JS/TypeScript Knowledge of both Linux and Windows operating systems and their interactions with open-source components Excellent interpersonal and communication skills to work effectively with cross-functional teams, with the use of fluent English Strong analytical and problem-solving abilities to identify compliance gaps and recommend appropriate solutions Fluent Polish required Residing in Poland required What we offer Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more Comfortable workplace – class A offices or remote work Dozens of fascinating projects for prestigious brands from all over the world PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers Investment in your growth – meetups, webinars, training platform and technology blog – you choose Fantastic atmosphere created by all Sii Power People If you want to work on systems with high operational significance — apply now!

🏢 Summary: Backend engineering role focused on building and maintaining Kotlin-based microservices for a modern fintech expense management platform. The position involves developing scalable financial integrations with banks, accounting, and HR systems while ensuring high reliability and performance. You will contribute to architecture improvements, code quality, and system observability in a cloud environment. 🗂️ Requirements: Minimum 3 years of software development experience, Commercial experience with Kotlin, Experience building backend systems, Experience with microservices architecture, Basic experience with AWS or Kubernetes, Experience with PostgreSQL, Experience with testing and observability tools, Good command of English, Residence in Poland 📃 Skills: Kotlin, Microservices, Backend, AWS, Kubernetes, PostgreSQL, JUnit, Grafana, Cloud 🏢 Description: Join a team working on a modern fintech platform that supports company expense management. The project focuses on developing a finance solution that enables seamless integration of financial tools (including payment cards, expense management, and invoice handling) directly into partner systems such as banks, accounting platforms, and HR solutions. The product allows companies to simplify financial processes, automate settlements, and gain full real-time control over their spending. Your tasks Designing, building, and maintaining microservices using Kotlin Collaborating with cross-functional teams to deliver solutions across Platform, Services, SMB, and other domains Supporting system performance monitoring and contributing to improvements in reliability and scalability Participating in code reviews and maintaining high code quality standards Contributing to the continuous improvement of code quality and system architecture Troubleshooting and resolving technical issues Requirements Minimum 3 years of professional experience in software development Hands-on experience with Kotlin in commercial projects Experience building backend systems and working with microservices architecture Basic experience with cloud environments (e.g., AWS, Kubernetes) Experience with relational databases (e.g., PostgreSQL) as well as testing and observability tools (e.g., JUnit, Grafana) Good command of English Residing in Poland required What we offer Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more Comfortable workplace – class A offices or remote work Dozens of fascinating projects for prestigious brands from all over the world PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers Investment in your growth – meetups, webinars, training platform and technology blog – you choose Fantastic atmosphere created by all Sii Power People If you want to work on systems with high operational significance — apply now!

🏢 Summary: Senior QA Automation role focused on architecting and implementing automated testing solutions using Playwright, while supporting manual testing activities. The position includes leading code reviews, establishing best practices for a new testing framework, and mentoring an internal team. The role requires hybrid work with presence in the client’s office three times a week. 🗂️ Requirements: Minimum 4 years of professional experience in software testing, Strong experience in architecting automated testing environments, Hands-on experience with Playwright testing framework, Experience in testing mobile and web applications, Ability to conduct code reviews and guide best practices, Willingness to support manual testing activities, Experience in onboarding and upskilling team members in new frameworks, Advanced proficiency in English, Advanced proficiency in Polish 📃 Skills: Playwright, Automation, Testing, QA, Mobile, Web, CodeReview 🏢 Description: Join our Team – the largest Testing Services Center in Poland, created by testers for testers, in a company routinely awarded with Great Place to Work awards. We help our employees identify, use, and grow their strengths by providing interesting projects and constant access to knowledge through our own training platform, webinars, a unique mentoring program, and experience exchange within our Community. The role requires working in the client’s office 3 times a week. Your tasks Providing hands-on automation and code reviews for the internal team Guiding the team through best practices for the newly selected framework Assisting with manual testing of new features Reviewing QA scope and testing estimates Requirements At least 5 years of professional experience in writing automated tests in Python Deep experience architecting automated testing environments (must-have testing framework: Playwright) Strong automation background with a willingness to support manual testing Expertise in testing both mobile and web applications Proven ability to onboard and upskill an internal team in a new framework Advanced English and Polish language proficiency What we offer Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more Comfortable workplace – class A offices or remote work Dozens of fascinating projects for prestigious brands from all over the world PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers Investment in your growth – meetups, webinars, training platform and technology blog – you choose Fantastic atmosphere created by all Sii Power People If you want to work on systems with high operational significance — apply now!

🏢 Summary: Offer for a Test Automation Engineer working on a modern banking application for managing payments, workflows, and document exchange between the bank and its clients. The role focuses on automated testing of customer-facing and internal systems within a large, modular architecture. Work is carried out in a cross-functional, project-based team using Java-based automation frameworks. 🗂️ Requirements: Minimum 3 years of experience in test automation with Java, Experience with Selenium or Selenide, Experience with Cucumber, Experience with Rest Assured, Experience with Git, Experience with Jenkins, Fluent Polish, Fluent English, Availability for hybrid work (3 days per week in Kraków office), Residence in Poland 📃 Skills: Java, Selenium, Selenide, Cucumber, RestAssured, Git, Jenkins 🏢 Description: Poszukujemy osoby, która wspólnie z nami będzie pracować nad nowoczesną aplikacją do zarządzania procesami i wymianą dokumentów pomiędzy bankiem a jego klientami. Czym się zajmujemy? Tworzymy duży, modułowy system, w którym każdy moduł ma swoje unikalne zadania - od obsługi procesów płatności i wymiany dokumentów z klientami, przez zaawansowane aplikacje wewnętrzne z harmonogramami i listami kontrolnymi, po administrację i personalizację procesów biznesowych. Twoje zadania Testowanie aplikacji skierowanej do klienta odpowiedzialnej za płatności, przepływy pracy i zarządzanie dokumentami Praca z wewnętrznymi systemami bankowymi, w tym modułami przepływu pracy, kalendarzami i panelami administracyjnymi Weryfikacja pulpitów administratora, w tym komponentów backendowych modułów i kalendarzy Praca w trybie zorientowanym na zadania, opartym na projektach (przeglądy kodu, wspólne rozwiązywanie problemów) Ścisła współpraca w ramach wielofunkcyjnego zespołu, w tym Tech Lead, 2 Analityków Biznesowych, Scrum Master, 5 Testerów, a także 6 Backend i 6 Frontend Developerów. Wymagania Co najmniej 3 lata doświadczenia w automatyzacji testów z wykorzystaniem języka Java Biegła znajomość języka polskiego i angielskiego Doświadczenie i chęć rozwoju w technologiach takich jak Java, Selenium (Selenide), Cucumber, Rest Assured, Git, Jenkins Dyspozycyjność do pracy hybrydowej - 3 dni w tygodniu w biurze w Krakowie Wymagane miejsce zamieszkania w Polsce Benefity, które czekają na Ciebie: Tytuł Great Place to Work od 2015 roku - to dzięki opiniom pracowników otrzymujemy tytuł i wdrażamy nowe pomysły Stabilność zatrudnienia - 2,1 MLD PLN przychodu, brak długów, od 2006 roku na rynku Dzielimy się zyskiem z pracownikami - od 2022 roku przeznaczyliśmy na ten cel już ponad 76 milionów PLN Bogaty pakiet benefitów - prywatna opieka zdrowotna, platforma kafeteryjna, zniżki na samochody i więcej Komfortowe miejsce pracy - pracuj w naszych biurach klasy A lub zdalnie Dziesiątki fascynujących projektów dla prestiżowych marek z całego świata 1 000 000 PLN rocznie na Twoje pomysły - taką kwotą wspieramy pasje i akcje wolontariackie naszych pracowników Stawiamy na Twój rozwój - meetupy, webinary, platforma szkoleniowa i blog technologiczny – Ty wybierasz Fantastyczna atmosfera stworzona przez wszystkich Sii Power People Dołącz do zespołu Sii – rozwijaj umiejętności, zdobywaj doświadczenie i buduj karierę!

🏢 Summary: Senior Full Stack Developer role focused on building and maintaining secure, scalable digital platforms using Java and Angular in an Agile environment. The position involves end-to-end development, system integration, code optimization, and ensuring high software quality for global mobility and fleet management solutions. The role requires close collaboration with cross-functional teams and stakeholders. 🗂️ Requirements: Minimum 5 years experience as Full Stack Java Developer with Angular, Strong proficiency in Java and Spring Framework, Solid experience with Angular (latest versions), Knowledge of software design principles and secure coding practices, Experience in API development, Familiarity with testing frameworks and CI/CD pipelines, Ability to create technical designs and conduct code reviews, Understanding of Agile methodologies, Fluent English (written and spoken), Fluent Polish, Residing in Poland, Availability to work from Warsaw office 2 days per week 📃 Skills: Java, Angular, Spring, REST, CICD, Testing, Agile 🏢 Description: We are looking for a Senior Full Stack Developer with strong expertise in Java and Angular to join our dynamic team. The project involves designing, developing, and maintaining cutting-edge digital platforms used globally by employees, clients, and drivers. Working in an Agile environment, the team partners closely with both corporate and local stakeholders to deliver innovative solutions that enhance connected vehicle services, fleet management, and self-service mobility experiences. Your tasks Developing backend and frontend components of the application Designing, developing, and maintaining high-quality, secure, and scalable software solutions Analysing business requirements and translating them into technical solutions Optimizing and refactoring existing codebases to improve stability, efficiency, and readability Supporting software integration and configuration activities Defining and executing testing strategies to ensure software reliability and quality before release Maintaining and updating technical documentation to reflect system changes and improvements Engaging in technical discussions and contributing to solution design Collaborating effectively with colleagues across different teams and locations Requirements At least 5 years of experience as a Full Stack Java Developer with Angular Strong skills in Java and Spring Framework for backend development Solid experience with Angular (latest versions preferred) for frontend development Strong knowledge of software design principles, secure coding practices, and API development Familiarity with testing frameworks and CI/CD pipelines Proficiency in creating technical designs, test cases, and conducting code reviews Good understanding of Agile methodologies Fluency in English, both written and spoken Openness to commuting to the office in Warsaw 2 days a week Fluent Polish required Residing in Poland required What we offer Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more Comfortable workplace – class A offices or remote work Dozens of fascinating projects for prestigious brands from all over the world PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers Investment in your growth – meetups, webinars, training platform and technology blog – you choose Fantastic atmosphere created by all Sii Power People If you want to work on systems with high operational significance — apply now!

🏢 Summary: Opportunity for a Lead Full Stack Engineer to architect and build a scalable web platform for risk, compliance, and business architecture management. The role covers end‑to‑end development across frontend and backend, cloud infrastructure design, and technical leadership in an Agile (Scrum) environment. You will drive architectural decisions, ensure high development standards, and deliver robust, data‑driven solutions. 🗂️ Requirements: 8+ years of software engineering experience, 3+ years in full‑stack roles building and launching web platforms, Expertise in React or Angular (modern frontend frameworks), Strong backend experience with REST APIs and microservices, Experience designing scalable, resilient architectures, Experience with PostgreSQL or MySQL, Experience with MongoDB or Cassandra, Proficiency with Git and version control workflows, Experience working in Agile (Scrum) environments, Ability to design and build cloud infrastructure using GCP, containers, and infrastructure as code, Availability to work from Kraków office 6–8 times per month, Residing in Poland 📃 Skills: React, Angular, Node.js, Java, Python, REST, Microservices, PostgreSQL, MySQL, MongoDB, Cassandra, GCP, Kubernetes, Docker, Serverless, CI/CD, Infrastructure-as-code, Agile, Scrum, Git 🏢 Description: Must-have technologies: React.js | Angular | Node.js | Java | Python | REST | Microservices | PostgreSQL | MySQL | MongoDB | Cassandra | GCP | Kubernetes | Docker | Serverless Computing | CI/CD | Infrastructure as code | Agile Methodology | Scrum Methodology Nice-to-have technologies: Alicloud | AWS | Microsoft Azure | Jupyter Notebooks | Pandas | NumPy Join Sii as a Lead Full Stack Engineer, and you will build and develop a modern web platform used for risk, compliance, and business architecture management. You will work on both frontend and backend, creating solutions from end to end. The role involves close collaboration with product managers, engineers, and business users to turn complex needs into practical tools. You will also take ownership of technical decisions and support high development standards within the team. Your work will help improve automation, compliance, and data‑driven decision‑making across the organization. Your tasks Architect, design, and build a scalable web platform from scratch, covering both frontend and backend Lead development of user‑facing features using modern frontend frameworks Develop and maintain backend services, including APIs, microservices, data models, and business logic Design resilient, performant architecture across databases, services, and APIs Collaborate closely with product, business, and engineering stakeholders in an Agile (Scrum) environment Ensure high‑quality, rapid delivery through CI/CD pipelines, automated testing, and code reviews Design and build scalable cloud infrastructure, preferably on GCP, using infrastructure as code, containerization, and serverless solutions Mentor engineers, promote team autonomy, uphold architectural standards, and drive technical excellence Work with both relational and NoSQL databases Requirements At least 8 years of software engineering experience, including 3+ years in full‑stack roles designing, building, and launching web platforms Strong expertise in modern frontend frameworks (React, Angular, or Vue), including component‑driven architecture, state management, routing, and responsive UI Solid backend experience covering RESTful APIs, microservices, domain‑driven design, scalable architectures, and fault tolerance Proven ability to build platforms and tools from scratch and deliver end‑to‑end solutions under tight timelines High level of autonomy: ownership of technical decisions, task management, and delivery with minimal supervision Experience with relational (PostgreSQL, MySQL) and NoSQL (MongoDB, Cassandra) databases Proficient with Git and version control workflows Deep understanding of architectural best practices combined with a fast‑paced, pragmatic, and results‑driven delivery mindset Availability to work from the Kraków office 6–8 times per month Residing in Poland required What we offer Great Place to Work since 2015 - it’s thanks to feedback from our workers that we get this special title and constantly implement new ideas Employment stability - revenue of PLN 2.1BN, no debts, since 2006 on the market We share the profit with Workers - over PLN 76M has already been allocated for this aim since 2022 Attractive benefits package - private healthcare, benefits cafeteria platform, car discounts and more Comfortable workplace – class A offices or remote work Dozens of fascinating projects for prestigious brands from all over the world PLN 1 000 000 per year for your ideas - with this amount, we support the passions and voluntary actions of our workers Investment in your growth – meetups, webinars, training platform and technology blog – you choose Fantastic atmosphere created by all Sii Power People If you want to work on systems with high operational significance — apply now!