Senior Java Developer (K/M)

🏢 Summary: Offer for an experienced Java Developer to deliver and maintain backend solutions for financial sector projects in microservices-based, scalable environments. The role covers full software development lifecycle from design to deployment within Agile teams. Projects are matched to candidate’s technical expertise and preferences. 🗂️ Requirements: Minimum 5 years of backend development in Java, Very good knowledge of Spring Framework, Spring Boot, Hibernate, Experience with microservices architecture, Strong knowledge of OOP, design patterns, multithreading, Experience with relational databases (Oracle or PostgreSQL), Good knowledge of SQL, Experience with system integrations (REST, SOAP, JMS), Experience with messaging and event-driven systems (Kafka or MQ), Knowledge of Maven or Gradle and Git, Experience with CI/CD and containerization (Docker, Kubernetes), Ability to design scalable and high-performance systems, Higher education in Computer Science or related field 📃 Skills: Java, Spring, SpringBoot, Hibernate, Microservices, OOP, SQL, Oracle, PostgreSQL, REST, JSON, SOAP, WSDL, JMS, XML, Kafka, MQ, Maven, Gradle, Git, CI/CD, Docker, Kubernetes 🏢 Description: Dla naszych klientów z sektora finansowego ( m.in . bankowość, ubezpieczenia) poszukujemy doświadczonych Java Developerów. Realizujemy różnorodne projekty zarówno rozwojowe, jak i utrzymaniowew środowiskach o zróżnicowanej architekturze i skali. Dobieramy projekty do kompetencji, doświadczenia oraz preferencji kandydatów, tak aby zapewnić jak najlepsze dopasowanie technologiczne i biznesowe. Wymagania Minimum 5 lat doświadczenia w programowaniu backendu w technologii Java Bardzo dobra znajomość Spring (Spring Framework, Spring Boot, Hibernate) Doświadczenie w projektowaniu i budowie rozwiązań opartych o architekturę mikroserwisową Praktyczna znajomość OOP , wzorców projektowych oraz zagadnień związanych z programowaniem wielowątkowym Doświadczenie w pracy z relacyjnymi bazami danych ( Oracle, PostgreSQL ) oraz dobra znajomość SQL Znajomość integracji systemowych (REST, JSON, SOAP, WSDL, JMS, XML) Doświadczenie w pracy z systemami kolejkowymi i rozwiązaniami event-driven (np. Kafka, MQ) Znajomość narzędzi do budowania i wersjonowania kodu (Maven/Gradle, Git) Doświadczenie w pracy w środowisku DevOps/CI/CD oraz z konteneryzacją (Docker, Kubernetes) Umiejętność tworzenia wydajnych, skalowalnych i optymalnych rozwiązań Wykształcenie wyższe (informatyka lub kierunki pokrewne) Obowiązki Współpraca przy analizie wymagań biznesowych oraz projektowaniu rozwiązań IT Projektowanie, implementacja, testowanie i wdrażanie rozwiązań zgodnie z przyjętymi standardami Dbanie o jakość wytwarzanego oprogramowania oraz zgodność z architekturą i wytycznymi technologicznymi Udział w pracach zespołu zwinnego (planowanie, przeglądy, retrospektywy) Wsparcie procesu testów oraz wdrożeń Utrzymanie i rozwój istniejących systemów oraz wsparcie w rozwiązywaniu problemów użytkowników Tworzenie i aktualizacja dokumentacji technicznej Ciągłe podnoszenie kompetencji i udział w inicjatywach usprawniających proces wytwarzania oprogramowania Oferujemy Kontrakt B2B z możliwością długoterminowej współpracy Praca hybrydowa: minimum 1 dzień w tygodniu w biurze w Warszawie Prywatna opieka medyczna (Luxmed) Karta Multisport

🏢 Summary: Offer for an experienced Java Developer to deliver and maintain backend systems for financial sector projects, including banking and insurance. The role involves designing and implementing scalable microservices-based solutions in diverse architectural environments. Projects are matched to the candidate’s technical expertise and experience. 🗂️ Requirements: Minimum 5 years of backend development experience in Java, Very good knowledge of Spring Framework, Spring Boot, Hibernate, Experience in microservices architecture design and development, Strong knowledge of OOP, design patterns, multithreading, Experience with relational databases (Oracle or PostgreSQL), Strong knowledge of SQL, Experience with system integrations (REST, SOAP, JMS), Experience with messaging and event-driven systems (Kafka or MQ), Knowledge of build and version control tools (Maven or Gradle, Git), Experience with CI/CD and containerization (Docker, Kubernetes), Higher education in Computer Science or related field 📃 Skills: Java, Spring, SpringBoot, Hibernate, Microservices, OOP, SQL, Oracle, PostgreSQL, REST, JSON, SOAP, WSDL, JMS, XML, Kafka, MQ, Maven, Gradle, Git, CI/CD, Docker, Kubernetes 🏢 Description: Dla naszych klientów z sektora finansowego ( m.in . bankowość, ubezpieczenia) poszukujemy doświadczonych Java Developerów. Realizujemy różnorodne projekty zarówno rozwojowe, jak i utrzymaniowew środowiskach o zróżnicowanej architekturze i skali. Dobieramy projekty do kompetencji, doświadczenia oraz preferencji kandydatów, tak aby zapewnić jak najlepsze dopasowanie technologiczne i biznesowe. Wymagania: Minimum 5 lat doświadczenia w programowaniu backendu w technologii Java Bardzo dobra znajomość Spring (Spring Framework, Spring Boot, Hibernate) Doświadczenie w projektowaniu i budowie rozwiązań opartych o architekturę mikroserwisową Praktyczna znajomość OOP , wzorców projektowych oraz zagadnień związanych z programowaniem wielowątkowym Doświadczenie w pracy z relacyjnymi bazami danych ( Oracle, PostgreSQL ) oraz dobra znajomość SQL Znajomość integracji systemowych (REST, JSON, SOAP, WSDL, JMS, XML) Doświadczenie w pracy z systemami kolejkowymi i rozwiązaniami event-driven (np. Kafka, MQ) Znajomość narzędzi do budowania i wersjonowania kodu (Maven/Gradle, Git) Doświadczenie w pracy w środowisku DevOps/CI/CD oraz z konteneryzacją (Docker, Kubernetes) Umiejętność tworzenia wydajnych, skalowalnych i optymalnych rozwiązań Wykształcenie wyższe (informatyka lub kierunki pokrewne) Obowiązki : Współpraca przy analizie wymagań biznesowych oraz projektowaniu rozwiązań IT Projektowanie, implementacja, testowanie i wdrażanie rozwiązań zgodnie z przyjętymi standardami Dbanie o jakość wytwarzanego oprogramowania oraz zgodność z architekturą i wytycznymi technologicznymi Udział w pracach zespołu zwinnego (planowanie, przeglądy, retrospektywy) Wsparcie procesu testów oraz wdrożeń Utrzymanie i rozwój istniejących systemów oraz wsparcie w rozwiązywaniu problemów użytkowników Tworzenie i aktualizacja dokumentacji technicznej Ciągłe podnoszenie kompetencji i udział w inicjatywach usprawniających proces wytwarzania oprogramowania Oferujemy: Kontrakt B2B z możliwością długoterminowej współpracy Praca hybrydowa: 1 dzień w tygodniu w biurze w Warszawie Prywatna opieka medyczna (Luxmed) Karta Multisport

🏢 Summary: The offer is for an experienced Java Developer to design, build, and maintain scalable backend systems and microservices. The role involves developing RESTful APIs, integrating with cloud services, and working with databases in a collaborative environment. The position is available fully remote or on-site in Warsaw or Gdańsk. 🗂️ Requirements: Minimum 4 years of commercial experience with Java, Strong knowledge of Spring and Spring Boot, Experience with cloud platforms (AWS, Azure, GCP or similar), Solid experience with relational or non-relational databases, Experience with RESTful API design, Experience with Git, Experience with CI/CD pipelines, Understanding of software development best practices 📃 Skills: Java, Spring, SpringBoot, AWS, Azure, GCP, PostgreSQL, MySQL, Oracle, MongoDB, Git, CI/CD, REST, Microservices 🏢 Description: About the Role We are looking for an experienced Java Developer. If you have at least 4 years of commercial experience in Java development, solid knowledge of databases, and hands-on experience with any cloud platform – we would love to hear from you. This position is available as fully remote or 100% on-site in Warsaw or Gdańsk . Responsibilities Designing, developing, and maintaining scalable backend systems using Java Building and optimizing RESTful APIs and microservices Collaborating with cross-functional teams (QA, DevOps, Product Owners, Frontend Developers) Writing clean, maintainable, and testable code Participating in code reviews and technical discussions Integrating applications with cloud-based services Working with relational and/or non-relational databases Troubleshooting, debugging, and performance optimization Contributing to architectural decisions and technical improvements Requirements Minimum 4 years of commercial experience with Java Strong knowledge of Spring / Spring Boot Experience with any cloud platform (e.g., AWS, Azure, GCP or other) Solid experience with databases (e.g., PostgreSQL, MySQL, Oracle, MongoDB, etc.) Good understanding of RESTful API design Experience with Git and CI/CD pipelines Good knowledge of software development best practices Very good command of English (min. B2+ level)

🏢 Summary: Opportunity for an experienced Java Developer to build and enhance digital banking systems, including electronic mortgage and workflow-based customer service platforms. The role focuses on developing microservices-based solutions and delivering high-quality, tested financial applications in a distributed team environment. 🗂️ Requirements: Minimum 4 years of Java programming experience, Experience building microservices, Strong object-oriented programming knowledge, Proficiency in Spring framework, Proficiency in Hibernate, Experience with RabbitMQ or Kafka, Experience with MongoDB, Experience writing unit and integration tests 📃 Skills: Java, Spring, Hibernate, Microservices, OOP, RabbitMQ, Kafka, MongoDB, Testing 🏢 Description: We are looking for an experienced Java Developer to join our project in the banking industry. In this role, you will work on developing either a fully electronic mortgage application system or workflow-based systems for post-sale customer service, including the sale of additional financial products. This is your chance to contribute to innovative, customer-focused solutions that combine cutting-edge technology with the reliability of a leading financial institution. Join us! Your tasks Deliver digitally advanced financial products and enhance existing systems by implementing new features and improvements Collaborate with globally distributed teams to develop customer-focused products Update and maintain comprehensive documentation for team processes, best practices, and software systems Apply exceptional analytical skills to develop creative, commercially viable solutions Contribute innovative ideas to the team while continuously expanding your technical knowledge Ensure key functionalities are covered with unit and integration tests Requirements Minimum 4 years of Java programming experience Experience building microservices and object-orientated programming Proficiency in frameworks for creating web applications, including Spring and Hibernate Prior experience with RabbitMQ/Kafka and MongoDB is beneficial Fluent level of written and spoken English Openness to hybrid work in Poznan or Wroclaw (min. 1 day/week in-office) 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: Remote B2B offer for an experienced Java Developer to design and build scalable REST APIs and broker integrations using Spring-based technologies within a microservices architecture. The role focuses on high-quality API development, SQL database management, and system design in a Scrum team. The position involves international collaboration and participation in architecture and integration initiatives. 🗂️ Requirements: Minimum 5 years of experience with Java (8/17/21), Strong knowledge of Spring Framework, Strong knowledge of Hibernate, Experience with REST API design and development, Experience with microservices architecture, Strong SQL and relational database expertise, Knowledge of architectural and design patterns, Experience with Git, Experience with TeamCity, Polish proficiency, English proficiency 📃 Skills: Java, Spring, Hibernate, SQL, REST, Microservices, Git, TeamCity, Maven, Scrum, RelationalDatabases, DesignPatterns 🏢 Description: Work model: remote, visit in the office once a quater in Warszawa Rate: up to 150 PLN/h (B2B contract) We are looking for a motivated Java Developer to join our team focused on building and evolving API integrations with external brokers. The ideal candidate will possess a strong background in Java, Spring-based technologies, and a deep understanding of systems integration and microservices architecture. You will contribute significantly to developing high-quality, maintainable APIs that enable seamless integration with various partners across multiple international markets. We work in a cross-functional team utilizing Scrum methodology. Main Responsibilities Design and build high-quality APIs using Java (8/17/21) and Spring-based technologies, ensuring scalability and maintainability. Develop and enhance broker integrations, contributing to business growth and market expansion. Contribute to modern service-oriented architecture design applying microservices knowledge. Manage SQL databases and ensure data consistency and reliability in applications. Utilize tools like Git, Maven, and TeamCity for continuous integration and code delivery. Collaborate on frontend API usability to ensure practical and well-structured solutions. Communicate effectively in Polish and English to facilitate international collaboration. Key Requirements At least 5 years of experience with Java (8/17/21 ) Deep knowledge of the Spring Framework and Hibernate. Strong SQL and relational database expertise. Strong problem-solving skills and proactive attitude. Experience in clean REST API design and development. Familiarity with microservices architecture. Knowledge of architectural and design patterns. Experience with Git and TeamCity. Polish and English proficiency. Nice to Have Experience with React for effective collaboration with frontend developers. Experience with large-scale applications using Maven. Knowledge of Apache Kafka. Experience with Domain-Driven Design (DDD) or Hexagonal architecture. Experience in decoupling monolithic applications. Background in the fintech industry. Recruitment process: 1. Live coding session 2. System design session 3. HR interview

🏢 Summary: Senior Java Developer role focused on designing, building, and operating highly scalable fintech backend systems supporting high-volume payment, trading, and settlement platforms. The position involves developing production-grade Java/Spring Boot microservices, scalable APIs, and distributed systems in cloud environments. The engineer owns features end-to-end, ensuring reliability, fault tolerance, and performance in high-traffic financial systems. 🗂️ Requirements: 5–15 years backend development experience, Strong Java experience in production, Hands-on Spring Boot experience, Experience in fintech, banking, payments, or trading systems, Experience building scalable backend services and APIs, Strong SQL knowledge, Experience with NoSQL databases, Knowledge of microservices architecture, Understanding of distributed systems, Experience with asynchronous processing, Experience across full SDLC, Cloud experience with AWS or Azure, Experience debugging distributed systems, English communication skills 📃 Skills: Java, Spring, SpringBoot, SQL, PostgreSQL, MySQL, MongoDB, NoSQL, Microservices, DistributedSystems, AWS, Azure, REST, APIs, SDLC, AsynchronousProcessing 🏢 Description: We are looking for a Senior Java Developer to join our team in Poland and contribute to the development of highly scalable fintech systems supporting trillions of dollars in transactions annually . In this role, you will work closely with the US-based product and engineering teams , helping to design, build, and operate backend services for programmable payment, trading, and settlement platforms. You will report directly to the Software Manager in Poland. A key requirement is excellent English communication skills and strong soft skills — we are looking for someone eloquent, outgoing, friendly, and confident in collaboration . Requirements 5 -15 years of professional backend development experience. Strong hands-on experience with Java and Spring Boot in production systems. Previous exposure to banking, payments, trading, or financial transaction systems. Proven experience building and maintaining backend services and APIs at scale. Solid understanding of SQL and NoSQL databases (e.g., PostgreSQL/MySQL, MongoDB). Knowledge of microservices architecture, distributed systems, and asynchronous processing. Experience across full SDLC: architecture, development, testing, deployment, and maintenance. Experience operating systems in cloud environments such as AWS or Azure . Excellent communication skills in English . Nice to Have Experience with Spring AI . Degree in Computer Science or equivalent practical experience. Personal Attributes Highly hands-on engineer who enjoys owning production-grade code. Comfortable working in a fast-paced, startup or high-growth environment. Strong analytical thinking, problem-solving ability, and attention to detail. Clear communicator, confident in collaborating with international teams. Friendly, proactive, and motivated to grow with the company and product. Design and develop backend architecture for fintech products and platforms. Build, maintain, and operate high-performance Java / Spring Boot microservices running in production environments. Develop scalable APIs and backend workflows with strong emphasis on data consistency, fault tolerance, and reliability. Own features end-to-end: from implementation through deployment and production support. Debug and resolve complex issues in distributed systems and high-volume production environments. Work closely with US-based teams to translate product requirements into robust backend solutions. Write clean, maintainable code and contribute to technical documentation, diagrams, and system workflows. Participate in code reviews and continuously improve backend quality and engineering standards.

🏢 Summary: Oferta dotyczy pracy zdalnej na stanowisku Java Developera przy rozwoju i utrzymaniu backendowych aplikacji mikroserwisowych w branży finansowej. Zakres obejmuje tworzenie usług REST, integracje asynchroniczne, pracę z bazami danych oraz konteneryzacją przy użyciu nowoczesnych technologii Java i Spring Boot. Firma oferuje rozwój technologiczny, szkolenia oraz pakiet benefitów pozapłacowych. 🗂️ Requirements: Minimum 3 lata doświadczenia komercyjnego jako Java Developer, Znajomość Java 11-21, Doświadczenie w Spring Boot 3.x–4.x, Umiejętność tworzenia i integracji REST API, Znajomość OpenAPI, Znajomość WebClient, Znajomość RabbitMQ, Znajomość Kafka, Znajomość PostgreSQL, Znajomość Elasticsearch, Doświadczenie z architekturą mikroserwisową, Znajomość Docker, Znajomość Kubernetes 📃 Skills: Java, Spring, SpringBoot, REST, OpenAPI, WebClient, RabbitMQ, Kafka, PostgreSQL, SQL, Elasticsearch, Docker, Kubernetes, Microservices, Selenium, Python, Angular 🏢 Description: Dla naszego Klienta z branży finansowej poszukujemy osoby na stanowisko Java Developera / Java Developerki . Osoba na tym stanowisku będzie odpowiadać za rozwój i utrzymanie aplikacji backendowych w oparciu o Java i Spring Boot oraz pracować z nowoczesnymi technologiami wykorzystywanymi w środowisku mikroserwisowym. Współpraca w trybie zdalnym. Opis stanowiska: Utrzymanie i rozwój oprogramowania – implementacja funkcjonalności, optymalizacja i utrzymanie kodu w technologii Java i Spring Boot Tworzenie i integracja interfejsów REST oraz komunikacja z wykorzystaniem OpenAPI i WebClient Implementacja rozwiązań asynchronicznych z użyciem RabbitMQ oraz Kafka Praca z relacyjnymi bazami danych (PostgreSQL, SQL) Tworzenie i uruchamianie kontenerów z wykorzystaniem Dockera i Kubernetes Analiza i obsługa podatności zgłaszanych przez klienta oraz wykrywanych w skanach bezpieczeństwa Tworzenie testów automatycznych Wymagania: Co najmniej 3-letnie doświadczenie komercyjne na stanowisku Java Developera Dobra znajomość języka Java 11-21 Praktyczne doświadczenie w tworzeniu aplikacji z użyciem Spring Boot (3.x–4.x) Umiejętność projektowania i implementowania interfejsów REST oraz pracy z OpenAPI i WebClientem Znajomość mechanizmów komunikacji asynchronicznej (RabbitMQ oraz Kafka) Dobra znajomość relacyjnych baz danych (np. PostgreSQL) oraz Elasticsearch i umiejętność ich integracji z aplikacjami backendowymi Doświadczenie w pracy z architekturą mikroserwisową Znajomość Dockera i Kubernetes Mile widziane: Znajomość języków skryptowych (np. Python) szczególnie w kontekście automatyzacji i tworzenia skryptów pomocniczych Umiejętność tworzenia testów automatycznych (Selenium) Dodatkowym atutem będzie znajomość Angular To oferujemy: Pracę w renomowanej organizacji (ITwiz BEST100), działającej w oparciu o międzynarodowe standardy jakości i bezpieczeństwa (ISO 9001, ISO 27001) ·       Niekorporacyjną atmosferę i płaską strukturę organizacyjną ·       Możliwość ciągłego rozwoju poprzez: ·       pracę z wykorzystaniem różnorodnych technologii w projektach dla renomowanych klientów ·       współpracę z doświadczonym zespołem ekspertów, którzy chętnie dzielą się wiedzą ·       dofinansowanie do szkoleń i certyfikatów ·       Program Poleceń Pracowniczych ·       Kulturę organizacyjną opartą na wartościach: ·       działamy z dobrą intencją ·       dzielimy się wiedzą ·       bierzemy odpowiedzialność ·       stale się doskonalimy ·       ludzie są dla nas najważniejsi ·       działamy, znając cel i sens naszej pracy ·       komunikujemy się szczerze i profesjonalnie ·       Udział w inicjatywach dobroczynnych, w tym współpracę z Fundacja im. Joanny Radziwiłł "Opiekuńcze Skrzydła" oraz udział w świątecznej akcji „Gwiazdorzymy” ·       Różnorodne i inkluzywne środowisko pracy – w naszej firmie współpracują przedstawiciele czterech pokoleń ·       Równe szanse rozwoju – 50% stanowisk menedżerskich i liderskich zajmują kobiety ·         Opieka medyczna LUX-MED, dofinansowanie 50% do karty Multisport, dofinansowanie do nauki języków oraz dostęp do platformy wellbeingowej

🏢 Summary: Opportunity for an experienced Java Developer to build and optimize high-performance financial systems, including trading platforms, risk management tools, and real-time market data solutions. The role focuses on developing scalable, mission-critical applications using modern Java and enterprise technologies. You will contribute to robust, low-latency systems in a fast-paced capital markets environment. 🗂️ Requirements: 5+ years of Java development experience (Java 8+), Strong experience with Spring Framework, Experience with relational and NoSQL databases (Oracle, PostgreSQL, MongoDB), SQL optimisation and database performance tuning skills, Experience with Maven or Gradle, Proficiency with Git, Experience designing and implementing RESTful APIs, Experience with messaging systems (JMS, RabbitMQ, Kafka) 📃 Skills: Java, Spring, Oracle, PostgreSQL, MongoDB, SQL, Maven, Gradle, Git, REST, JMS, RabbitMQ, Kafka 🏢 Description: About the Role We're seeking an experienced Java Developer to contribute to innovative financial technology solutions that drive the global capital markets. You'll be part of a collaborative team developing mission-critical systems including high-performance trading platforms, sophisticated risk management tools, regulatory compliance frameworks, and real-time market data processing engines trusted by top-tier financial institutions worldwide. What You'll Do Design and develop robust, scalable financial applications using modern Java technologies Build and optimise high-throughput trading systems and market data processing solutions Collaborate with cross-functional teams to deliver risk management and compliance platforms Implement RESTful services and integrate messaging systems for real-time data flow Optimise database performance and ensure system reliability in fast-paced trading environments Required Qualifications 5+ years of hands-on Java development experience with modern versions (Java 8 and above) Strong expertise in Spring Framework and enterprise application development Proven experience with relational and NoSQL databases including Oracle, PostgreSQL, and MongoDB Demonstrated skills in SQL optimisation and database performance tuning Proficiency with build automation tools ( Maven, Gradle ) Experience with Git version control and collaborative development workflows Solid understanding of RESTful API design and implementation Knowledge of enterprise messaging systems ( JMS, RabbitMQ, Kafka ) Be happy to work in a hybrid model - 3 days per week in the office in Central Krakow

🏢 Summary: Senior Java Developer role focused on designing and building high-performance, scalable backend systems in a distributed microservices environment for the financial sector. The position involves developing REST APIs, processing large data volumes, and contributing to architecture and CI/CD in cloud-based environments. The role requires strong expertise in Java, Spring, distributed systems, and Kubernetes. 🗂️ Requirements: Minimum 10 years of software development experience, Very good knowledge of Java and Spring, Strong understanding of REST APIs, HTTPS, microservices, and message queues, Ability to design high-availability, scalable, high-performance systems, Very good knowledge of relational databases and SQL, Knowledge of distributed systems and data processing, Hands-on experience with Kubernetes and cloud platforms (GCP preferred), Familiarity with CI/CD pipelines, Experience working in Agile methodologies, Fluent Polish and English, Residence in Poland 📃 Skills: Java, Spring, REST, HTTPS, Microservices, MQ, SQL, Kubernetes, GCP, CI/CD, Agile, DistributedSystems, DataProcessing 🏢 Description: We are looking for an experienced Senior Java Developer to join a team responsible for building and developing modern backend systems in a distributed environment. The projects involve high-performance and scalable solutions used in the financial sector, with a focus on processing large volumes of data and microservices architecture. Your tasks Designing and developing backend systems based on Java Creating and evolving a microservices architecture Building and maintaining REST APIs and system integrations Designing solutions that meet high availability and performance requirements Working with systems that process large volumes of data Collaborating with the team using Agile methodologies Participating in architecture design and technical decision-making Implementing and optimizing CI/CD processes and ensuring system security Requirements Minimum 10 years in software development Very good knowledge of Java (backend) and Spring Strong understanding of REST APIs, HTTPS, microservices, and message queues (MQ) Ability to design high-availability, scalable, and high-performance systems Very good knowledge of relational databases (SQL) Familiarity with CI/CD pipelines and Agile ways of working Knowledge of distributed systems and data processing Hands-on work with Kubernetes and cloud platforms (GCP preferred) Fluent Polish and English required Residing in Poland required Nice-to-have requirements Knowledge of Go, Rust, or similar system-level languages Experience with NoSQL and analytical databases, e.g., ClickHouse Frontend development experience Familiarity with the banking sector (trade lifecycle, FX, post-trade processing) Banking experience / FX experience (forex) Working from the office in Krakow 6 times per month 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 Backend Java Developer to design, develop, and support Java applications for savings and investment products within a financial institution. The role focuses on building calculation engines compliant with international tax regulations, integrating with tax authorities, and delivering customer-facing reporting solutions. It involves full software development lifecycle participation, collaboration with analysts, and mentoring team members in a hybrid work model in Poland. 🗂️ Requirements: Strong proficiency in Java 21, Experience with Spring Boot and Hibernate, Experience with relational databases and SQL, Knowledge of PostgreSQL, Knowledge of JMS and MQ messaging protocols, Familiarity with OpenAPI and AsyncAPI, Proficiency with Git, Experience with CI/CD pipelines, Understanding of software design patterns, Understanding of object-oriented programming principles, Ability to participate in full software development lifecycle 📃 Skills: Java, Spring, Hibernate, SQL, PostgreSQL, JMS, MQ, OpenAPI, AsyncAPI, Git, CI/CD 🏢 Description: Introduction & Summary: The position requires experienced Backend Java Developers to join a prominent financial institution. The ideal candidates will possess extensive knowledge in Java development, particularly within financial services, and demonstrate strong analytical and collaboration skills. This role will involve the design, implementation, and support of Java applications that manage essential financial products. Main Responsibilities: As a Backend Java Developer, you will be responsible for creating and maintaining robust Java applications. Key responsibilities include: Designing, developing, and enhancing Java applications supporting savings and investment products. Building calculation engines ensuring compliance with tax regulations across multiple countries. Integrating with tax authorities and generating customer-facing reports. Participating in the complete software development lifecycle, including requirements analysis, design, coding, testing, and deployment. Collaborating with financial analysts to transform requirements into technical solutions. Mentoring other developers and acting as a code reviewer. Utilizing AI-assisted development to improve productivity and quality. Key Requirements: Strong proficiency in Java (version 21) and related frameworks (Spring Boot, Hibernate). Experience with relational databases and SQL (PostgreSQL). Knowledge of messaging protocols such as JMS and MQ. Familiarity with OpenAPI and AsyncAPI for data management. Proficiency in version control systems (Git) and CI/CD pipelines. Understanding of software design patterns and object-oriented programming principles. Excellent collaboration and analytical skills. Nice to Have: Experience in financial services or related domains. Keen interest in emerging technologies. Other Details: This role is based in Poland with a hybrid work model requiring three days at the office from Gdańsk/Warsaw. The engagement focuses on enhancing financial solutions in the investment sector.