Regular Kotlin Developer (f/m/x)

🏢 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: 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: Udział w rozwoju kluczowego systemu bankowego opartego na nowoczesnej, skalowalnej architekturze, który zastępuje rozproszone rozwiązania jedną modułową platformą. Rola obejmuje rozwój backendu w Kotlinie, współtworzenie architektury mikroserwisowej oraz automatyzację wdrożeń. To projekt z realnym wpływem na globalne rozwiązanie i wysokimi standardami jakości oraz bezpieczeństwa. 🗂️ Requirements: Minimum 5 lat doświadczenia w Kotlin, Doświadczenie ze Spring Boot, Znajomość Spring Framework, Praktyczna znajomość Azure DevOps, Znajomość Git, Doświadczenie z PostgreSQL, Doświadczenie z Cassandra, Doświadczenie z Kafka, Znajomość CI/CD, Doświadczenie z mikroserwisami lub systemami rozproszonymi, Znajomość języka polskiego, Zamieszkanie w Polsce 📃 Skills: Kotlin, Spring, SpringBoot, Azure, AzureDevOps, Git, PostgreSQL, Cassandra, Kafka, CI/CD, Microservices 🏢 Description: Dołącz do projektu z branży bankowej, w którym będziesz rozwijać kluczowy system mający na celu zastąpienie wielu rozproszonych rozwiązań jednym skalowalnym, modułowym fundamentem. Platforma wspiera koordynację zmian w aplikacjach i procesach biznesowych oraz realnie usprawnia codzienną pracę zespołów developerskich i operacyjnych. Jest to projekt dla osób, które chcą pracować z nowoczesną architekturą, realnie wpływać na rozwój globalnego rozwiązania i rozwijać się w środowisku stawiającym na jakość oraz skalowalność. Twoje zadania Rozwój i utrzymanie aplikacji backendowych w Kotlinie, z naciskiem na jakość kodu i testy Analiza, diagnoza i rozwiązywanie problemów w istniejących rozwiązaniach Udział w rozwoju architektury systemu oraz integracji z innymi komponentami Wsparcie procesów wdrożeniowych, w tym automatyzacja deploymentów Dbanie o wysokie standardy bezpieczeństwa systemów Współpraca w zespole developerskim oraz udział w code review Wymagania Co najmniej 5 lat doświadczenia w tworzeniu aplikacji w Kotlinie z wykorzystaniem Spring Boot i Spring Framework Praktyczna znajomość Azure DevOps oraz Git Doświadczenie w pracy z bazami danych i narzędziami: PostgreSQL, Cassandra, Kafka Znajomość zagadnień związanych z CI/CD oraz procesami wdrożeniowymi Doświadczenie w pracy z mikroserwisami lub systemami rozproszonymi Komunikatywność i umiejętność pracy zespołowej Znajomość j. polskiego Zamieszkanie na terenie Polski 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: 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: Development and maintenance of an Android mobile banking application in the payments and transfers domain for a large-scale banking project. The role focuses on implementing new features, integrating with backend services, and ensuring high code quality using modern architectural patterns. The project has significant impact on end-user mobile banking experience. 🗂️ Requirements: Minimum 3 years of commercial Android development experience, Practical experience with Kotlin, Very good knowledge of Android SDK and Android Studio, Experience with Coroutines and Flow, Experience with Architecture Components, Experience with Dagger2, Experience with Jetpack Compose, Knowledge of Clean Architecture, MVVM or MVI, Experience with REST API and WebSocket integration, Experience with Git, Experience with CI/CD tools, Ability to write unit, integration and UI tests, Experience working in Agile methodology, Fluent Polish, Communicative English, Residence in Poland 📃 Skills: Kotlin, Android, AndroidSDK, AndroidStudio, Coroutines, Flow, ArchitectureComponents, Dagger2, JetpackCompose, CleanArchitecture, MVVM, MVI, REST, WebSocket, Git, CI/CD, TeamCity, Jenkins, Gradle, UnitTesting, IntegrationTesting, UITesting 🏢 Description: Dołącz do projektu realizowanego dla jednego z największych banków w Polsce, w którym rozwijamy i utrzymujemy obszar płatności oraz przelewów w aplikacji mobilnej. Zespół odpowiada za wdrażanie nowych typów przelewów, dostosowanie aplikacji do regulacji europejskich oraz redesign wybranych elementów systemu. To projekt o dużej skali i realnym wpływie na codzienne doświadczenia użytkowników korzystających z bankowości mobilnej. Twoje zadania Rozwój i utrzymanie aplikacji mobilnej Android w obszarze płatności i przelewów Implementacja nowych funkcjonalności oraz optymalizacja istniejących rozwiązań Integracja aplikacji z backendem poprzez REST API i WebSocket Dbanie o jakość kodu, testy jednostkowe, integracyjne i UI Udział w projektowaniu architektury aplikacji (Clean Architecture, MVVM/MVI) Współpraca z zespołami backend, UX i analitykami w metodyce Agile Udział w code review oraz procesach CI/CD Wymagania Minimum 3 lata komercyjnego doświadczenia w tworzeniu aplikacji Android, w tym praktyczna praca w Kotlin Bardzo dobra znajomość Kotlin, Android SDK oraz Android Studio, w tym doświadczenie z Coroutines & Flow, Architecture Components, Dagger2 oraz Jetpack Compose Znajomość wzorców projektowych (Clean Architecture, MVVM, MVI) oraz doświadczenie w integracji z backendem (REST API, WebSocket) Wcześniejsza praca z Git oraz narzędziami CI/CD (TeamCity, Jenkins, Gradle) oraz umiejętność pisania testów (jednostkowych, integracyjnych, UI) Doświadczenie w pracy w metodyce Agile Gotowość do pracy hybrydowej – wizyty w biurze 1 raz na 2 tygodnie Komunikatywna znajomość języka angielskiego Wymagane przebywanie na terenie Polski oraz płynna znajomość języka polskiego Mile widziane Doświadczenie w technologii .NET / C# 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 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: The offer is for an experienced QA Engineer responsible for designing and executing integration and contract tests for web and mobile applications, ensuring high product quality and stability. The role involves API and database testing, defect reporting, and close collaboration with developers in an Agile environment. Candidates will contribute to test documentation and quality assurance processes across projects. 🗂️ Requirements: Minimum 5 years of experience in testing web applications, Minimum 5 years of experience in testing mobile applications, Knowledge of test design techniques, Experience with API testing using Postman or Swagger, Experience working with SQL databases, Experience with at least one bug tracking system: Jira, TestRail, qTest, Zephyr, or Azure DevOps, Experience working in Agile methodology, Fluency in English (minimum B2), Fluency in Polish (minimum B2), Residence in Poland 📃 Skills: Postman, Swagger, SQL, Jira, TestRail, qTest, Zephyr, AzureDevOps, Agile 🏢 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. Your tasks Creating test cases and test scenarios Planning and executing integration, contract testing Reporting all encountered problems and errors Preparing test reports, creating documentation Ensuring all tests maintain the highest quality Working with developers to understand the critical paths and ensure product stability Requirements At least 5 years of experience with testing web and mobile applications Knowledge of common test design techniques Previous work with API testing (Postman, Swagger) and SQL databases Familiarity with one of the following bug tracking systems: Jira, TestRail, qTest, Zephyr, Azure DevOps Experience of working in Agile methodology Openness, good communication, attention to detail, and the ability to work in a team Fluency in English and Polish (at least B2) Residing in Poland required Nice-to-have requirements ISTQB certificate Experience with WCAG or ETL/Data testing German fluency Preferred candidates from Białystok 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 Tester role focused on designing and executing integration and contract tests for web and mobile applications. The position involves API and database testing, defect reporting, documentation, and close collaboration with developers in an Agile environment. Candidates must have strong experience in test design, bug tracking tools, and fluency in English and Polish while residing in Poland. 🗂️ Requirements: Minimum 5 years of experience testing web and mobile applications, Experience creating test cases and test scenarios, Experience with integration and contract testing, Experience with API testing using Postman or Swagger, Knowledge of SQL databases, Experience with bug tracking tools: Jira, TestRail, qTest, Zephyr, or Azure DevOps, Experience working in Agile methodology, Fluency in English (B2+), Fluency in Polish (B2+), Residence in Poland 📃 Skills: Testing, API, SQL, Postman, Swagger, Jira, TestRail, qTest, Zephyr, AzureDevOps, Agile, WCAG, ETL 🏢 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. Your tasks Creating test cases and test scenarios Planning and executing integration, contract testing Reporting all encountered problems and errors Preparing test reports, creating documentation Ensuring all tests maintain the highest quality Working with developers to understand the critical paths and ensure product stability Requirements At least 5 years of experience with testing web and mobile applications Knowledge of common test design techniques Previous work with API testing (Postman, Swagger) and SQL databases Familiarity with one of the following bug tracking systems: Jira, TestRail, qTest, Zephyr, Azure DevOps Experience of working in Agile methodology Openness, good communication, attention to detail, and the ability to work in a team Fluency in English and Polish (at least B2) Residing in Poland required Nice-to-have requirements ISTQB certificate Experience with WCAG or ETL/Data testing German fluency Preferred candidates from Białystok 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 Senior Front-End Software Engineer to design and develop real-time trading UI components for a wealth management platform using Svelte/SvelteKit. The role focuses on building scalable, high-performance interfaces integrated with backend trading systems, ensuring low latency and high usability. You will work in a Scrum team, contribute to CI pipelines, and support production trading environments. 🗂️ Requirements: 5+ years of experience building production applications with Svelte or SvelteKit, Strong knowledge of HTML, CSS, JavaScript, TypeScript, Experience with component architecture, reactivity, and state management in Svelte, Ability to integrate front-end applications with REST, WebSocket, and messaging APIs, Experience writing unit and component-level tests, Familiarity with CI pipelines and modern front-end tooling, Basic Linux skills (shell navigation, log inspection, process control, remote workflows), Fluent English, Communicative Polish 📃 Skills: Svelte, SvelteKit, JavaScript, TypeScript, HTML, CSS, REST, WebSocket, Linux, CI, Shell, APIs 🏢 Description: We develop our product offering to help wealth management to serve their clients' portfolios. For this, we build scalable solutions that need to perform with a rich history of financial data. We specialize in being breadth of offerings to support smaller firms' needs to serve their users well with a highly configurable solution with many functions. Our platform has been built over years of experience in the portfolio management domain. We enhance business functionalities as well as strengthen our technology to scale operationally with low cost of ownership and high quality. For this work, we are looking for further Software Engineers to become full members of our team and take the tasks at hand from the Scrum backlog. Your tasks Design and develop front-end components and windows for IPT/IOM trading workflows using modern Svelte / SvelteKit, with a focus on real-time responsiveness, interoperability and minimal latency Write testable, maintainable code with appropriate unit and component-level tests, and contribute to the team’s continuous integration pipelines Apply modern tooling and champion clean-code and performance standards across the front-end codebase Contribute to code reviews and help raise the team’s engineering standards around component architecture, accessibility, and maintainability Integrate UI components with IPT/IOM back-end services and other upstream/downstream trading systems via REST, WebSocket, and messaging APIs Iterate rapidly — prototype, refine, and ship new features on tight timelines, working directly with traders and squad stakeholders to validate behaviour Operate on Linux: shell navigation, log inspection, process control, and remote workflows Provide front-line support for UI issues in production trading installations, diagnosing problems quickly and delivering fixes with minimal disruption to live trading Act as a close partner to back-end engineers, product owners — translating operational feedback into concrete UI/UX improvements Champion UX quality by applying strong usability, layout, and interaction judgment to data-dense, high-frequency-use interfaces Requirements Solid hands-on, more than 5 years of experience building production applications with Svelte (and/or SvelteKit), including component architecture, stores, reactivity, and lifecycle management Strong command of modern HTML, CSS, and JavaScript/TypeScript, along with browser APIs, async patterns Demonstrable sensitivity to usability, layout, and interaction design — particularly for data-dense, high-frequency-use professional interfaces Comfortable with basic Linux operations — shell navigation, package management, log inspection, process control, and remote development workflows Fluent English, both written and spoken Polish at a communicative level 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!